Ahead of the UK Budget on 28 October, one phrase keeps appearing in the coverage: fiscal drag. It sounds technical, but it describes something many people already feel in their pay packets. Fiscal drag is the way a government can collect more tax without raising tax rates, simply by leaving the thresholds where they are while wages and prices rise. For anyone trying to understand how a Budget can affect households, gilts and markets, it is a useful idea to get to grips with.
How it works
Income tax in the UK is charged in bands. You pay nothing on income up to the personal allowance, which is £12,570, then the basic rate on income above that, and the higher rate once your income passes £50,270, outside Scotland, which sets its own bands. Those thresholds are set by the government.
Normally, thresholds would rise each year roughly in line with inflation. When they are frozen instead, something quiet happens. As wages rise, more of each person’s income falls into the taxed bands, and more people cross into the higher-rate band. Nobody’s tax rate has changed, but the government collects more.
That is fiscal drag. Inflation and pay growth drag people into paying more tax.
A simple example
Imagine someone earning £48,000 who receives a pay rise of 5%, taking them to £50,400. If the higher-rate threshold stays fixed at £50,270, a small slice of their income is now taxed at the higher rate for the first time. If prices also rose by around 5%, their pay has not really increased in terms of what it buys, yet their tax bill has gone up. Across millions of workers, those small amounts add up to large sums for the Treasury.
Why governments use it
Raising headline tax rates is politically difficult. Freezing thresholds is less visible and raises money gradually. The UK has frozen the main income tax thresholds for several years, and under plans set out in last year’s Budget they are due to stay frozen until 2031. The Office for Budget Responsibility, which produces the official economic and fiscal forecasts, has estimated that these freezes raise very large amounts of revenue over time.
Fiscal drag can affect other taxes too, including thresholds for National Insurance, capital gains and inheritance tax, wherever allowances stay fixed while incomes and asset values rise.
How it links to the Budget
Every Budget is a balancing act between spending, taxes and borrowing, measured against the government’s fiscal rules. Our explainer on fiscal headroom explains how much room the Chancellor has against those rules. When headroom is tight, keeping thresholds frozen is one of the least visible ways of raising money, which is why it features so prominently in Budget speculation.
Why markets care
Gilt investors watch Budgets closely because they reveal how much the government plans to borrow. A Budget that relies on believable revenue, including steady fiscal drag, may reassure bond markets. One that looks likely to need more borrowing can push gilt yields higher. Our guide to gilts explains how those bonds work and why their yields matter for the wider economy.
There is also an economic effect. Fiscal drag takes spending power out of households, which can weigh on consumer demand. That can matter for retailers, housebuilders and other businesses that rely on domestic spending, and it is part of the picture the Bank of England considers when judging how much the economy needs cooling.
Why it matters for investors personally
Frozen allowances also affect investors. As more people move into higher tax bands, using tax-efficient wrappers becomes more valuable. Our comparison of an ISA versus a trading account covers some of the practical differences, although everyone’s circumstances differ and tax rules can change.
The takeaway
Fiscal drag is the extra tax collected when thresholds stay frozen while wages and prices rise. It is quiet, gradual and powerful, which makes it a favourite tool for governments with little room to manoeuvre, and one to watch closely on 28 October.
If you want to understand how events such as the Budget move UK markets, our free trader assessment can show you where to focus your learning first.
