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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsWhen a government pays more to borrow, interest takes a larger share of its budget. That can leave less room for public services and other priorities, or increase pressure to raise revenue or borrow more. But higher borrowing costs do not automatically cause a particular tax increase, service cut, or rise in consumer-price inflation: those outcomes depend on policy choices and wider economic conditions.
Why government debt costs more when interest rates rise
A government’s interest bill depends on both how much it owes and the rates it pays on that debt. The Congressional Budget Office (CBO) says federal net interest costs are mainly determined by debt held by the public and the average interest rate on that debt.
A change in market rates does not immediately reset the interest rate on every existing fixed-rate bond. The average cost generally changes as debt matures and is refinanced. Short-term or floating-rate debt can reprice sooner. In its 2026 federal baseline, the CBO estimates that the average interest rate on debt held by the public rises from 3.4% in 2026 to about 3.9% in the final projection years. These are estimates for U.S. federal debt under that baseline, not rates paid by every government or on every bond.
Borrowing to cover interest adds to the debt stock, which can in turn increase future interest costs. The CBO describes this feedback in The Budget and Economic Outlook: 2026 to 2036: “Borrowing to pay for greater interest costs pushes up the net cost of interest further.”
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What the current U.S. baseline projects
The CBO’s February 2026 baseline projects federal net interest outlays to rise over the decade. These are projections under current law and stated economic assumptions—not a prediction of the tax and spending decisions Congress will eventually make.
| Measure | 2026 | 2036 |
|---|---|---|
| Federal net interest outlays | $1.0 trillion, CBO projection | $2.1 trillion, CBO projection |
| Net interest as a share of GDP | 3.3%, CBO projection | 4.6%, CBO projection |
| Average rate on debt held by the public | 3.4%, CBO estimate | About 3.9% in the final projection years, CBO estimate |
The CBO projects net interest outlays to grow by an average of 7.5% per year in nominal terms from 2026 through 2036. Separately, it reported that U.S. federal net interest costs were $970 billion, or 3.2% of GDP, in fiscal year 2025. That is a reported result for that fiscal year, not a projection; the CBO said the GDP share was more than twice the 2021 share.
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The baseline reflects a forecast incorporating trade policy as of November 20, 2025, economic developments and laws through December 3, 2025, and laws in place as of January 14, 2026. Later appropriations are not included. The CBO cautions that actual results will differ as laws, administrative actions, court decisions, and economic conditions change.
How interest costs can affect public services
Interest is a budget outlay, so rising interest costs can narrow the room available for other spending if policymakers want to limit deficits. But that does not mean a named program is automatically cut: the baseline is not a line-item experiment showing that higher rates directly reduce a particular service.
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The CBO projects federal interest outlays to nearly equal all discretionary spending in 2036. Discretionary spending is set through appropriations and includes areas such as defense, education, housing assistance, international affairs, justice, and highways. The comparison indicates the scale of the budget pressure; it does not show that each of those areas will lose funding.
Other budget trends also matter. The CBO projects growth in mandatory programs, especially Social Security and Medicare, alongside a declining discretionary share of GDP. Those are distinct pressures and should not be attributed solely to higher borrowing rates.
Could higher interest costs mean higher taxes?
Possibly, but not automatically. If debt-service costs remain high and policymakers seek to reduce deficits, they could raise revenue, restrain or redirect noninterest spending, borrow more, or combine those approaches. The CBO’s summary of Effects of Federal Borrowing on Interest Rates and Treasury Markets states: “As debt and the resulting interest costs continue to grow, greater adjustments to the noninterest components of the budget are required to reduce deficits.”
That describes a budget constraint, not a forecast that a particular tax will rise. Which taxes change, who pays them, and whether lawmakers instead alter spending or accept larger deficits are political and legislative choices. The CBO baseline does not specify a future tax increase as the necessary response.
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Do higher government borrowing costs cause inflation?
There is no one-step rule that higher government borrowing costs cause consumer prices to rise. Interest rates and inflation can move together for different reasons, and the direction of causation matters:
- Inflation can influence borrowing rates. Expected inflation can be reflected in nominal interest rates, including the rates investors demand on government debt.
- Central banks may raise rates to reduce inflation. In that case, higher government borrowing costs can be part of a broader response intended to cool demand and bring inflation down.
- Debt and inflation expectations can interact under some conditions. The CBO identifies a risk that expectations of higher inflation could erode confidence in the dollar. That is a risk channel, not evidence that a rise in borrowing costs necessarily or immediately raises consumer prices.
Inflation also depends on demand, supply conditions, monetary policy, expectations, and why borrowing costs rose. The CBO’s 2026 baseline does not establish that higher federal borrowing costs mechanically cause consumer-price inflation.
Why the effects differ between countries
The U.S. figures are not a template for other governments. The consequences depend on the amount of debt, how quickly it matures or reprices, whether it is denominated in domestic or foreign currency, the investor base, access to financing, and monetary institutions. A rate increase driven by anti-inflation policy, rising expected inflation, sovereign risk, or broader financial-market conditions can have different implications.
The International Monetary Fund’s April 2026 Fiscal Monitor describes a specific trade-off in some low-income developing countries: shifting toward domestic debt markets may reduce foreign-exchange risk, but can raise borrowing costs, strengthen links between sovereigns and domestic banks, and crowd out private credit. This is a conditional observation about some countries, not a universal result of domestic borrowing.
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The CBO baseline shows that federal interest costs could claim a substantially larger share of the U.S. budget over the coming decade under its assumptions. It does not decide how Congress will respond. Taxes, public services, additional borrowing, and inflation each involve separate policy choices or economic mechanisms; the debt burden creates pressure, but does not determine a single outcome.
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