Fiscal drag is the increase in the tax burden that occurs when tax thresholds, allowances and brackets are not raised in line with inflation or earnings growth. As nominal incomes rise, more people start paying income tax and more of their income falls into higher rate bands, even though tax rates themselves have not changed. In the United States the same effect is usually called bracket creep.
Fiscal drag raises revenue without a vote on new rates, which is why critics call it a stealth tax. The term is also used in a second, related sense: the tendency of a progressive tax system to take a growing share of income as the economy grows, slowing the recovery of private demand. Both meanings describe how the structure of the tax system, rather than explicit decisions, shapes fiscal policy.
Fiscal drag in plain terms
Imagine a toll road that is free for cars under a certain value, and the limit has not changed in years. As car prices rise with inflation, more and more ordinary cars cross the limit and start paying, even though nobody raised the toll. Drivers are not richer in real terms; their cars just cost more.
Income tax works the same way. If the tax-free allowance stays fixed while wages rise with prices, a worker whose pay buys exactly what it did before ends up paying a bigger share of it in tax. The government gains revenue quietly, and the worker loses a little every year.
How fiscal drag works
Take a worker earning 30,000 with a tax-free allowance of 12,000 and a flat 20% rate above it. Their tax is , or 12% of income. If prices and wages both rise by 10%, pay becomes 33,000. With the allowance frozen, tax becomes , or about 12.7% of income. Had the allowance risen to 13,200, tax would have been 3,960, still 12%. The extra 240 is fiscal drag: the worker is no better off in real terms but pays a larger share in tax. In a system with several bands, the effect is larger, as people cross into higher marginal tax rates.
The same mechanism can affect other taxes with fixed nominal thresholds, such as capital gains tax exemptions, inheritance tax allowances, VAT registration limits and the income limits for means-tested benefits.
The UK threshold freeze
The United Kingdom provides the most prominent recent example. In March 2021 the government froze the income tax personal allowance at £12,570 and the higher-rate threshold at £50,270, initially until April 2026. The freeze was later extended to April 2028, and at the Autumn Budget of 26 November 2025 the Chancellor extended it again to April 2031. The Office for Budget Responsibility estimated that the combined threshold freezes would raise about £56 billion in 2030–31, and that by then the personal allowance would be around £4,900 higher had it risen with inflation. Because inflation ran far above expectations in 2022–2023, the freeze raised much more than originally forecast, pulling millions of extra people into paying tax or into the higher rate.
Indexation as the remedy
The main protection against fiscal drag is indexation: automatically raising thresholds each year in line with a price index such as the consumer price index. The United States indexed federal income tax brackets to inflation from 1985 under the Economic Recovery Tax Act of 1981, after high inflation in the 1970s had pushed many middle-income households into higher brackets; the Internal Revenue Service now publishes adjusted brackets each year. Many countries index some thresholds but not others, and governments often suspend indexation when they need revenue. Others, including several emerging economies, adjust thresholds only occasionally in the annual budget, so drag builds up between changes.
Debate
Supporters of using fiscal drag argue that it is an administratively simple way to raise revenue, that it falls on people whose nominal incomes are rising, and that it can act as an automatic stabilizer by damping demand when an economy is overheating. Critics argue that it lacks transparency because the tax rise is never voted on explicitly, that it hits low- and middle-income earners in particular when the personal allowance is frozen, and that it can create sharp cliff edges where tax and benefit withdrawal combine. Economists of different schools also note that it makes the tax system more progressive or more regressive depending on which thresholds are frozen. The debate connects to broader arguments about the size of the state and the burden of taxation, including those raised by advocates of supply-side economics.