Key takeaway: The personal allowance (£12,570) and higher rate threshold (£50,270) are frozen until April 2031. By 2030/31, an estimated 700,000 additional people will have been pulled into income tax and millions more into the 40% higher rate band through wage growth alone — without a single tax rate increase. For practices, fiscal drag is both a compliance reality and an advisory opportunity: every client whose income is rising is a client with a growing tax liability that can be planned around. BrightTax and BrightPropose give practices the tools to make that planning systematic.
Fiscal drag is the mechanism by which a government increases tax revenue without changing tax rates. When income rises — through wage growth, inflation, or business growth — but the thresholds at which income becomes taxable, or at which it crosses into a higher band, remain fixed, a larger proportion of income is taxed than in previous years. The effect compounds over time. A basic rate taxpayer whose salary increases by 3% per year will cross the higher rate threshold without any policy announcement, simply because wages have grown and the threshold has not.
The freeze announced in 2022 and extended to April 2031 is the longest sustained threshold freeze in recent UK history. The Office for Budget Responsibility’s assessment is that it will produce approximately £11.6 billion in additional annual tax revenue by 2030/31 — representing one of the most significant revenue-raising measures of the decade, achieved entirely through inaction rather than legislation. For clients and their accountants, the practical effect is a sustained, multi-year increase in effective tax rates on the same income.
Who Is Affected and by How Much
The freeze affects three groups differently:
Currently non-taxpaying individuals. Workers currently earning below £12,570 who receive pay rises over the coming years will enter income tax at some point before 2031 without any change to the tax-free amount. HMRC estimates 700,000 people will be pulled into income tax solely as a result of the freeze.
Basic rate taxpayers approaching the higher rate threshold. A worker earning £45,000 in 2026/27 who receives annual pay rises of 3% will cross the £50,270 higher rate threshold before the freeze lifts in 2031. From that point, 40% rather than 20% applies to their earnings above the threshold. The effective tax increase on crossing the threshold is substantial — and it arrives automatically without the employee or their employer taking any action.
Higher rate taxpayers approaching the additional rate. The additional rate threshold (£125,140) is also frozen. The personal allowance taper — which reduces the personal allowance by £1 for every £2 of income above £100,000 — creates a marginal rate of 60% in the £100,000–£125,140 band. As more taxpayers with rising incomes enter this range, the planning imperative around pension contributions and other income-reduction strategies increases.
The Planning Opportunities Fiscal Drag Creates
For practices with clients whose income is growing, the frozen threshold environment creates multiple planning conversations:
Pension contributions as income management. Personal pension contributions reduce adjusted net income for income tax purposes. For a client approaching the higher rate threshold, contributions that keep total income within the basic rate band prevent the marginal rate jumping from 20% to 40%. The value of this planning is not speculative — it is calculable from the client’s current income and growth trajectory.
Salary sacrifice review. For employed clients or director-shareholders, salary sacrifice pension contributions reduce PAYE income before tax and NIC. With the higher rate threshold fixed, the planning value of salary sacrifice for employees approaching £50,270 increases each year that wages rise. Practices managing employer clients through BrightPay can identify employees in the approach zone and flag the opportunity to employers.
ISA maximisation. Interest income, dividend income, and capital gains from investments held in ISAs are all free of tax. As more income falls into the higher rate band due to fiscal drag, the relative value of moving investments into ISA wrappers increases. Clients who have not maximised their ISA allowance (£20,000 per year) while in the basic rate band will find the opportunity cost of not having done so grows as their marginal rate increases.
Charitable giving. Gift Aid on charitable donations extends the basic rate band by the grossed-up value of the donation. For clients who are higher rate taxpayers, Gift Aid donations generate higher rate relief — 40% less the 20% recovered by the charity, giving an effective cost of 60p per £1 donated to a higher rate taxpayer. For clients with philanthropic intent, this is more valuable than many realise.
Business income deferral or acceleration. For self-employed clients and owner-managed businesses, the timing of income realisation can be managed to keep income below threshold boundaries. With the higher rate threshold fixed at £50,270, the incentive to manage the timing of income near that level is stronger than it was when thresholds were expected to rise annually with inflation.
Making Planning Systematic with BrightTax and BrightPropose
The challenge for practices is not identifying that fiscal drag creates planning opportunities — it is making the delivery of that planning systematic across a large client base. A partner who remembers to have the pension planning conversation with two or three key clients is not delivering the same value as a practice whose workflow systematically identifies every client approaching a threshold change and triggers a planning review.
BrightTax gives practices the complete picture of each client’s tax position — income from all sources, deductions, reliefs, and the marginal rates applying at different income levels. For practices using BrightTax for self-assessment, the data to identify clients approaching the higher rate threshold or the personal allowance taper zone is already in the system. The planning conversation starts with knowing which clients need it, and provides that visibility.
BrightPropose is Bright’s proposal and engagement letter platform. Once a planning opportunity is identified, turning it into a new advisory engagement — a tax planning review, an annual planning meeting, a retirement planning engagement — requires a professional proposal that sets out the scope, the value, and the fee. BrightPropose allows practices to produce and send itemised advisory proposals quickly, converting the insight from BrightTax into billable advisory work with a minimum of administrative friction.
The combination — BrightTax identifying the planning need, BrightPropose converting it into an advisory engagement — turns fiscal drag from a background compliance reality into a systematic revenue driver for the practice.
Frequently Asked Questions
How long are UK income tax thresholds frozen?
The personal allowance (£12,570) and higher rate threshold (£50,270) are frozen until April 2031. The freeze was originally announced to April 2026 and extended to 2028 and then 2031. The OBR estimates the extended freeze will produce £11.6 billion in additional annual tax revenue by 2030/31.
What is fiscal drag and why does it increase tax bills without a rate change?
Fiscal drag occurs when income rises — through wage growth or inflation — but tax thresholds remain fixed. As income grows into or further into taxable bands, the effective tax rate on total income increases even though the statutory rates are unchanged. The government collects more tax from the same taxpayer each year, without announcing a tax increase.
How many additional people will be pulled into income tax by 2031?
HMRC and the OBR estimate that approximately 700,000 additional individuals will be pulled into income tax as a result of the threshold freeze — meaning their income will exceed the frozen personal allowance of £12,570 by 2030/31. Separately, millions of existing taxpayers will cross the higher rate threshold for the first time as wages grow, despite no policy change.
What is the most effective planning strategy for a client approaching the higher rate threshold?
The most commonly effective approach is pension contributions — either personal contributions or salary sacrifice. Contributions reduce adjusted net income for tax purposes, potentially keeping the client within the basic rate band. The planning value depends on how close the client is to the threshold and how quickly their income is growing. An annual review of each client’s income trajectory against the frozen threshold is the practical first step.
How can practices identify which clients are most affected by fiscal drag?
Clients with employment income or self-employment income between £40,000 and £50,000 in 2026/27 are in the approach zone for the higher rate threshold. Clients between £100,000 and £130,000 are in or approaching the personal allowance taper. Practices using tax return software that captures clients’ total income from all sources can identify this group systematically and prioritise them for proactive planning conversations.
BrightTax provides the complete picture of each client’s income and marginal tax position, making it possible to systematically identify clients approaching threshold boundaries. BrightPropose converts planning insights into professional advisory proposals that expand the practice’s fee-earning work. Find out more about BrightTax or BrightPropose, or speak to your account manager.
