Fundamentals

What Public Debt Is and How It Affects Economic Freedom

By Daniel Sardá · April 28, 2026

Public debt is the set of financial obligations a state assumes when it borrows resources or issues securities that promise future payments.

In simple terms: it is government spending financed today with a promise to pay tomorrow.

If a government spends 100, collects 90 and covers the difference by issuing bonds for 10, that shortfall becomes debt. The state receives money now. In exchange, it promises to repay it in the future with interest.

Understanding what public debt is matters because it is not an abstract figure. Behind every bond, loan or public security there is a concrete question: who will pay that obligation, with what resources and under what conditions?

The answer is almost never “the state,” as if the state were a person separate from society. Public debt is eventually paid in some form: current taxes, future taxes, inflation, refinancing, lower private spending, weaker growth, financial repression, restructuring or default.

From a liberal-libertarian perspective, the central problem is institutional. Debt allows political power to spend today without charging the full cost immediately. That can weaken fiscal discipline, transfer burdens to people who did not participate in the original decision and expand the real size of the state without a visible bill in the present.

What public debt is

Public debt is the set of financial liabilities of the state or the public sector.

It may include:

The OECD measures general government debt as gross debt expressed as a percentage of GDP. That definition includes several types of financial liabilities and allows countries to be compared, although it does not capture every possible fiscal risk.

The basic idea is simple: the state receives resources today and promises future payments of principal, interest or both.

The principal is the amount originally borrowed.

The interest is the cost of the loan.

The maturity is the date on which all or part of the obligation must be paid.

The debt service is the set of payments associated with that debt: interest, principal amortization and, in some cases, other financial costs.

Why it is also called state debt or sovereign debt

It is called state debt because the debtor is a public entity: the central government, general government, a regional administration, a municipality, a public company or the broader public sector, depending on the case.

It is also called sovereign debt when it is issued or guaranteed by a sovereign state.

But “sovereign” does not mean risk-free. A state may have taxing power, regulatory power and, if it issues in its own currency, some monetary room for maneuver. Even so, it can face crises of confidence, loss of market access, inflation, default or restructuring.

Sovereignty does not abolish scarcity. It only changes the mechanisms through which the cost is distributed.

How it differs from private debt

Private debt arises from contracts among individuals, businesses or private institutions.

If a family borrows, it must pay with its income or assets. If a company borrows, it must pay with its cash flow, sell assets, renegotiate or go bankrupt.

The state operates differently. It can pay through taxes, issue new debt, sell public assets, cut spending, change rules, regulate the financial system or, if it controls the currency, pressure the central bank to facilitate financing.

That is why the household analogy is useful only up to a point.

A household cannot legally force its neighbors or future generations to pay its credit cards. The state can commit future income from taxpayers who did not voluntarily sign the debt contract.

Public deficit and public debt are not the same

Deficit and debt are related, but they are not the same thing.

The public deficit is a shortfall in a given period, usually measured by fiscal year.

Public debt is the accumulated stock of obligations.

A simple example:

A government spends 100 and collects 90.

It has a deficit of 10.

If it finances that shortfall by issuing bonds, public debt increases by 10.

If it repeats the same pattern for several years, accumulated debt grows even if each annual deficit appears small.

The deficit is a flow; debt is accumulation

The deficit is like spending more than what comes in during one year.

Debt is like the outstanding balance accumulated after several years of shortfalls, interest and refinancing.

That is why a country may have high debt even if this year’s deficit is low. It may also run a deficit while the debt-to-GDP ratio does not rise as much if the economy grows in nominal terms, if there is inflation, if assets are sold or if accounting adjustments exist.

But the general teaching rule holds: persistent deficits tend to accumulate debt.

Spending, taxes and inflation are not the same either

It is useful to separate concepts.

Public spending is what the state disburses.

Taxes are compulsory payments demanded by the state to finance itself. For that dimension, see what taxes are and how they affect economic freedom.

Inflation is a generalized and sustained increase in prices, or from the citizen’s perspective, the loss of the currency’s purchasing power. For that dimension, see what inflation is and why it destroys purchasing power.

Public debt can be connected to taxes and inflation, but it is not identical to either. It may be paid with future taxes, refinanced, partly diluted through inflation or end in restructuring. The concrete path depends on the country, the currency, the creditors, the institutions and the economic context.

How public debt is created

Public debt may arise through several channels.

The most common is simple: the state spends more than it collects.

But that is not the only path.

Public spending greater than revenue

If the government collects less than it spends, it must cover the difference.

It can do so in several ways:

Debt appears when that shortfall becomes a future financial obligation.

Crises, wars and emergencies

States often borrow during wars, natural disasters, pandemics, banking crises or deep recessions.

The argument is that extraordinary spending cannot be covered immediately through taxes alone without causing greater damage or provoking political resistance.

This is one of the strongest defenses of public debt. But it also contains a risk: real emergencies can become excuses for permanent spending, clientelist programs or bureaucratic expansion that continues after the crisis has ended.

Interest on past debt

A state can also borrow to pay interest on previous debt.

This is especially dangerous when debt begins to finance not productive investment or extraordinary spending, but the cost of debt accumulated earlier.

At that point, the budget becomes trapped by past decisions. Every year, a larger share of public revenue goes to interest payments, leaving less room to reduce taxes, cut deficits or face new crises.

Structural deficits

A structural deficit does not depend only on a bad economic moment.

It exists when the state has permanent commitments above its normal revenue: public payrolls, subsidies, pensions, deficit-ridden state companies, transfers, bureaucracy or political programs that are difficult to reduce.

Chronic debt often starts there: permanent promises financed with insufficient revenue.

How public debt is financed

The state finances itself by issuing instruments or taking loans.

The names vary by country, but the logic is similar: the government receives money and gives a promise to pay.

Treasury bills

Treasury bills are usually short-term securities.

In Spain, the Tesoro Público explains that Letras del Tesoro are short-term fixed-income securities that do not pay a periodic coupon. Their return comes from the difference between the purchase price and the amount received at maturity.

The Spanish example is useful for understanding the mechanism, although each country has its own rules, terms and names.

Bonds and long-term government obligations

Bonds and obligations are usually medium- and long-term securities.

They normally pay periodic interest, called coupons, and repay nominal value at maturity.

For the buyer, the bond is a financial asset. For the state, it is a liability. That double nature is essential: what looks like wealth for a creditor may become an obligation for the future taxpayer.

Loans from banks, organizations and other states

Not all public debt is issued as a tradable bond.

A government can also borrow from:

The World Bank compiles external debt statistics for low- and middle-income countries, including public and publicly guaranteed debt reported by debtor countries.

Domestic and external debt

Domestic debt is usually held by residents or issued in the local market.

External debt is usually owed to nonresident creditors, or issued under foreign jurisdiction or foreign currency, depending on the definition used.

Oversimplification is dangerous.

Domestic debt is not irrelevant because “we owe it to ourselves.” Creditors and taxpayers are not necessarily the same people. There is redistribution, tax pressure, banking exposure and opportunity cost.

External debt is not always worse either. It can provide financing when domestic saving is insufficient. But it usually increases risk if it is denominated in foreign currency, governed by foreign jurisdiction or subject to changes in international confidence.

The right question is more precise: in what currency was the debt issued, at what rate, with what maturities, who are the creditors, what was the money used for and what is the real capacity to pay?

Debt in domestic currency and foreign currency

Debt in domestic currency can provide more room for maneuver if the state controls the currency. It can refinance, influence rates or allow inflation to dilute part of the debt’s real value.

But that does not make it free. If payment occurs through loss of purchasing power, the cost is paid by those who use and save in that currency.

Debt in foreign currency is more restrictive. A country that owes dollars, euros or another currency it does not issue cannot simply create that currency. It needs exports, reserves, external financing or fiscal adjustment.

That is why the currency matters as much as the amount.

Who buys public debt

Public debt has buyers because it offers a state-backed promise to pay.

Depending on the country and instrument, creditors may be very different.

Citizens and small savers

A person may buy government securities to receive interest or preserve capital, depending on the options available.

That does not make debt neutral. The citizen as creditor expects to be paid. The citizen as taxpayer, present or future, may be the one financing that payment.

Sometimes they are the same person. Often they are not.

Banks and insurers

Banks often hold public debt on their balance sheets because of regulation, liquidity, profitability or risk management.

This can create a delicate relationship: if the state borrows too much and banks hold many public securities, a fiscal crisis can become a banking crisis.

The financial system can end up highly exposed to the very state that is supposed to regulate it.

Investment funds and pension funds

Pension funds, insurers and investment funds buy public debt because it is often treated as a relatively safe asset within certain institutional frameworks.

But “safe” does not mean risk-free. There is inflation risk, interest-rate risk, exchange-rate risk, default risk and financial-repression risk.

If a debt crisis hits pension funds or banks, the cost may indirectly reach workers, retirees, savers and taxpayers.

Central banks

Central banks may buy public debt through open market operations, liquidity programs or asset-purchase programs.

The Federal Reserve describes open market operations as purchases and sales of securities used to implement monetary policy.

The Bank of England explains quantitative easing as the electronic creation of money to buy bonds, including government bonds, from private investors.

Precision matters. Not every purchase of debt by a central bank is automatically direct fiscal financing. Buying in the secondary market to manage liquidity is not identical to buying debt directly from the Treasury to cover a deficit.

But the risk exists: if those purchases become permanent tools to sustain state borrowing, the boundary between monetary policy and fiscal financing becomes politically dangerous.

Foreign investors and multilateral organizations

Foreign investors buy public debt when they expect returns, stability, legal protection or diversification.

Multilateral organizations may lend under specific conditions, especially during fiscal or balance-of-payments crises.

This can provide financial oxygen, but it also reduces room for maneuver. A highly indebted state can become conditioned by creditors, markets, international organizations or restructuring negotiations.

How public debt is measured

It is not enough to ask “how much debt is there?”

One must also ask: debt relative to what, with what maturities, at what rate, in what currency and owed to whom?

Total nominal debt

Total nominal debt is the absolute amount.

It helps size the obligation, but it has limits. A debt of 100 billion does not mean the same thing in a large, productive economy with a credible currency as it does in a small, stagnant economy with fragile institutions.

Debt as a percentage of GDP

The debt-to-GDP ratio compares the stock of debt with the annual size of the economy.

It is useful because it approximates the burden relative to productive capacity.

But it does not explain everything. Two countries with the same debt-to-GDP ratio can face very different risks if one issues in its own currency, has long maturities and fiscal credibility, while the other owes in foreign currency, pays high rates and depends on constant refinancing.

Debt service

Debt service shows how much it costs to pay interest and maturities.

Sometimes the problem is not only the total size of the debt, but the annual flow that must be covered.

If interest absorbs a growing share of the budget, the state has less room to reduce taxes, finance basic services or respond to emergencies without borrowing again.

Maturities and refinancing

A state does not always pay all its debt when it matures. Often it refinances it.

Refinancing, or rollover, means issuing new debt to pay old debt.

This can be normal when there is confidence. But it does not eliminate the obligation. It changes the calendar, rate, creditor or conditions.

If the market demands higher rates, shorter maturities or stricter guarantees, refinancing can become a crisis.

Fiscal sustainability

The IMF defines debt sustainability as the government’s capacity to meet present and future obligations without exceptional financial assistance or default.

Sustainability is not only arithmetic. It depends on growth, rates, currency, maturities, fiscal credibility, creditor composition, political stability and institutional capacity to correct imbalances.

A debt may look manageable while rates are low. It can become heavy when rates rise, growth falls or confidence is lost.

Who really pays public debt

This is the central question.

Public debt does not pay itself.

It can be paid in several ways, and each one distributes the cost differently.

Current taxpayers

If the government raises taxes or uses current revenue to pay interest and principal, current taxpayers pay.

This can occur through income taxes, consumption taxes, contributions, fees or levies on businesses.

The cost does not always fall on the person who is legally liable. As with taxes in general, part of the burden can shift to consumers, workers, shareholders, suppliers or entrepreneurs.

Future taxpayers

If the state issues debt today and pays it years later, part of the burden shifts to future taxpayers.

That is why debt is often described as a deferred tax.

This does not mean every bond will be paid exclusively with future taxes. There may be growth, inflation, refinancing or restructuring. But when payment comes from future fiscal revenue, debt operates as a postponed tax obligation.

The moral point is delicate: people who did not vote, did not participate or were not even born may end up financing political decisions made before them.

Users of the currency

If debt is diluted through inflation, those who use and hold balances in the affected currency pay.

They do not receive a tax bill. But their wage, savings or cash buys less.

That is why economists speak of the inflation tax: a loss of purchasing power that works as a real transfer toward whoever issues or benefits from monetary expansion.

This mechanism often hurts those who have less ability to protect themselves with foreign currency, real assets, indexation or financial instruments.

Savers under financial repression

Financial repression occurs when the state uses regulations to channel savings toward public debt or artificially reduce its financing cost.

It may include capital controls, interest-rate caps, regulations that favor public securities, reserve requirements, forced purchases or inflation above the nominal return of assets considered safe.

The saver may not see an explicit tax, but receives a lower real return while the state finances itself more cheaply.

Creditors affected by default or restructuring

If the state cannot or will not pay as promised, it may default or renegotiate terms.

That can reduce the immediate fiscal burden, but it is not costless.

It affects reputation, future access to credit, banks, pension funds, savers, private investment and institutional trust. In some cases, the domestic financial system is damaged because it holds many public securities.

Citizens affected by weaker growth

Debt can also be paid through lost opportunities.

If the state absorbs savings that would have financed private investment, raises the risk premium, anticipates future taxes or makes credit more expensive, it can reduce growth.

That cost does not appear as a line in the budget. It appears as fewer firms, less formal employment, lower productivity, weaker wages or lower investment.

Public debt and future taxes

Public debt often functions as a postponed tax.

The government avoids charging the full cost today and promises to pay tomorrow.

The political problem is obvious: raising taxes now creates immediate resistance. Issuing debt allows present spending to be financed with a lower visible political cost.

Present benefit, future cost

A debt-financed program can deliver quick political benefits: public works, subsidies, public jobs, transfers, contracts or public consumption.

The cost appears later, when the state must pay interest, refinance, raise taxes or cut spending.

That separation between present benefit and future cost is one of the central institutional problems of public debt.

Not everything is paid by “the state”

Saying “the state will pay” hides reality.

The state pays with resources it obtains from people: taxpayers, consumers, workers, entrepreneurs, savers or users of money.

Even if payment is made possible by economic growth, that growth comes from private activity, investment, work, productivity and institutions that allow wealth to be created.

Public debt is not an autonomous source of wealth. It is a promise backed by the future ability to extract, redirect or erode resources.

Interest payments crowd out other choices

When interest payments rise, the budget becomes more rigid.

The government must choose among:

All options have costs.

From a liberal perspective, the most important cost is that the scope for private decision-making is reduced. More resources become committed by past political obligations.

Public debt and inflation

Public debt does not automatically cause inflation.

A state can have high debt without high inflation for some time if there is confidence, a strong currency, demand for its bonds, institutional discipline or a credible central bank.

But debt can become inflationary under certain conditions.

When it can become inflationary

The risk rises when:

In those cases, inflation can operate as an indirect form of payment.

The state reduces the real value of its obligations in local currency, but it also reduces the real value of wages, savings and contracts denominated in that currency.

Direct and indirect monetization

Direct monetization occurs when the central bank clearly finances the government, for example by buying debt directly from the Treasury or providing advances to cover deficits.

Indirect monetization is more ambiguous. It may occur when the central bank buys debt in the secondary market, keeps rates artificially low or provides liquidity that facilitates public debt placement.

Not every asset-purchase program is fiscal monetization. But if the real objective becomes sustaining the state’s apparent solvency, the central bank starts becoming subordinated to the budget.

Seigniorage and the inflation tax

Seigniorage is the benefit the money issuer obtains by creating currency.

When that issuance reduces purchasing power, citizens pay through inflation.

This connects debt with the system of fiat money: if the currency is not constrained by a strong rule and the central bank becomes subject to fiscal needs, indebtedness can end up pressuring monetary stability.

Public debt and central banks

The relationship between public debt and central banks is one of the most delicate areas of modern economic policy.

Central banks influence interest rates, liquidity, bank reserves, open market operations and expectations. All of this affects the cost of financing the state.

Interest rates and refinancing costs

If rates rise, issuing new debt becomes more expensive.

Refinancing old debt also becomes more expensive when it matures.

A country with a large amount of short-term or variable-rate debt may feel that increase faster. The budget becomes pressured by higher interest costs.

Purchases of public debt

A central bank may buy public debt to implement monetary policy, stabilize markets or increase liquidity.

That purchase can occur in the secondary market, from investors that already hold the bonds, not necessarily directly from the government.

The distinction matters.

But the incentive also matters: if the state knows the central bank can support demand for its securities, it may feel less pressure to put its accounts in order.

Fiscal dominance

Fiscal dominance occurs when monetary policy becomes subordinated to the government’s fiscal needs.

Example: the central bank avoids raising rates even when inflation requires it because doing so would make public debt service too expensive.

Another example: it buys public debt not for monetary stability, but to prevent the government from facing a financing crisis.

In that scenario, the currency becomes trapped by the budget. Citizens pay for fiscal disorder through inflation, devaluation or loss of confidence.

Public debt and state spending

Public debt allows the state to spend more than it collects.

That can be exceptional or chronic.

The difference is decisive.

Debt for extraordinary spending

There may be situations in which borrowing is defensible: a war, a natural disaster, a real public-health crisis or an infrastructure project with verifiable benefits and a long useful life.

Even in those cases, debt should be transparent, limited, assessable and accompanied by a repayment plan.

Debt for permanent spending

The more serious problem appears when permanent current spending is financed with debt.

Examples include:

That spending does not end. It accumulates. And when debt can no longer grow easily, the adjustment arrives.

The political temptation

Debt reduces immediate political pain.

Charging taxes today forces the cost to be shown.

Borrowing allows political actors to promise benefits now and leave the bill to another administration, other taxpayers or future users of the currency.

Public choice theory, and especially James M. Buchanan and Richard E. Wagner in Democracy in Deficit, warned about this incentive: democratic systems can reward visible spending and punish adjustment, creating a bias toward chronic deficits.

How public debt affects economic freedom

Public debt affects economic freedom because it conditions the future use of private resources.

It does not always do so immediately or dramatically. Sometimes it does so slowly: higher expected taxes, lower investment, more expensive credit, inflation, financial controls or a narrower range of private choice.

Higher expected tax pressure

If citizens and firms expect the state to need more revenue to pay debt, they adjust decisions.

They may invest less, consume differently, move capital, avoid formalization or demand higher returns to compensate for risk.

The expectation of future taxation can influence behavior before taxes are actually raised. Debt is therefore not neutral: it can alter incentives today because people anticipate the state’s future claims on private income.

Less private investment and more crowding out

When the state borrows heavily, it competes for savings and credit that could otherwise finance private projects.

This is not automatic in every circumstance, but it is a serious risk. If public debt absorbs domestic savings, pushes rates higher or raises perceived country risk, private investment can be displaced.

The result is not only a financial statistic. It can mean fewer businesses, fewer productive projects and slower wage growth.

More power over future citizens

Public debt allows current political majorities to bind future citizens.

That creates an intergenerational problem. Those who benefit from spending today may not be the same people who bear the tax, inflation or adjustment costs tomorrow.

From a liberal-libertarian perspective, this is a problem of consent and responsibility. Political power should not be able to indefinitely expand present benefits by placing opaque burdens on people who had no real say in the decision.

Greater risk of inflationary financing

When debt becomes difficult to pay through ordinary revenue or voluntary refinancing, political pressure for monetary financing increases.

If the central bank resists, the government must adjust. If the central bank yields, the cost can be shifted to users of the currency through inflation.

That reduces economic freedom because it weakens the citizen’s ability to save, plan, contract and preserve purchasing power.

Financial repression and controls

A heavily indebted state may use regulation to make financing easier.

It can pressure banks, pension funds or insurers to hold public debt; restrict capital movement; cap rates; privilege government securities; or create rules that channel private savings toward the public sector.

This reduces the range of voluntary financial choice. Savings stop being allocated primarily according to private risk and return, and are redirected toward the fiscal needs of the state.

A larger and less transparent state

Debt can hide the cost of government.

If all spending had to be financed immediately through explicit taxes, citizens would see the cost more clearly. Debt separates spending from payment. That makes the state appear cheaper than it really is.

The result can be a larger public sector, more programs and more obligations without an equally visible fiscal debate.

Arguments in favor of public debt

A serious critique should recognize the best arguments in favor of public debt.

Intergenerational projects

If a public work has a long useful life and benefits future citizens, its defenders argue that financing it over time may be reasonable. A bridge, port, aqueduct or basic infrastructure project can serve several generations.

The problem is verification. Not every project presented as investment actually creates value. Debt-financed projects must be transparent, evaluated, limited and subject to accountability.

Emergencies

In war, natural disasters, pandemics or severe banking crises, debt can allow extraordinary costs to be distributed over time.

This argument is stronger than the argument for routine borrowing. But even then, emergency debt should not become a permanent spending habit.

Macroeconomic stabilization

Some economists defend debt as a tool to stabilize the economy during recessions, when private demand falls sharply.

The liberal reply is not that no crisis ever exists. The reply is that repeated discretionary borrowing can create incentives for permanent deficits, politicized spending and future adjustment. Stabilization arguments must therefore be constrained by rules, transparency and credible repayment plans.

Development financing

Countries with little domestic saving may use external borrowing to finance infrastructure or development projects.

This can be defensible if the projects raise productivity and repayment capacity. It becomes dangerous when debt finances consumption, corruption, patronage, overvalued projects or state companies that destroy value.

Liberal-libertarian criteria for judging public debt

The question is not simply whether public debt exists. Most modern states have some debt.

The relevant question is whether debt is limited by institutions that protect taxpayers, savers and future citizens.

Useful criteria include:

From a liberal-libertarian perspective, debt should be exceptional, transparent and constrained. It should not be a hidden mechanism for expanding state power.

Conclusion

Public debt is not magic money. It is government spending financed with a promise to pay in the future.

That promise may be fulfilled through taxes, refinancing, inflation, lower growth, financial repression, restructuring or default. In every case, someone pays.

Public debt can be defensible in exceptional situations or for projects whose benefits are real, verifiable and spread across time. But chronic debt used to finance permanent spending weakens fiscal discipline, obscures the cost of the state and transfers burdens to people who may not have consented to them.

The liberal-libertarian concern is therefore institutional: debt gives political power a way to spend today while postponing the bill. The more that bill is hidden, monetized or shifted into the future, the more economic freedom is weakened.

A free society needs public finances that are transparent, limited and accountable. It also needs money that preserves purchasing power, taxes that are visible and constrained, and institutions that prevent current governments from mortgaging the future in the name of present political gain.

Frequently asked questions

What is public debt in simple terms?

Public debt is the money the state owes after borrowing or issuing securities. In simple terms, it is government spending financed today with a promise to pay later.

Is public debt the same as the deficit?

No. The deficit is the annual shortfall between public spending and revenue. Public debt is the accumulated stock of obligations created by past deficits, interest and refinancing.

Who really pays public debt?

Public debt is paid by current taxpayers, future taxpayers, users of the currency through inflation, savers affected by financial repression, creditors in a restructuring, or citizens through lower growth and lost opportunities.

Does public debt always cause inflation?

No. Public debt does not automatically cause inflation. It becomes inflationary when the state cannot finance itself sustainably and the central bank directly or indirectly supports deficits or debt through monetary expansion.

Why does public debt affect economic freedom?

It affects economic freedom because it commits future private resources, increases expected tax pressure, can reduce investment, can encourage inflationary financing and may lead to financial controls that redirect private savings toward the state.

Is all public debt bad?

Not necessarily. Debt may be defensible in emergencies or for transparent long-term projects with verifiable benefits. The problem is chronic debt used to finance permanent current spending without clear limits or repayment discipline.