HMRC Tax Threshold Freeze Until 2031: Fiscal Drag Cost for £100k+ Earners

Frozen Tax Thresholds: Why Your Tax Bill Is Rising When Your Salary Isn’t

Fiscal drag occurs when wage increases fail to keep pace with inflation-adjusted tax thresholds. In plain English: you’re earning more nominally (in pounds), but inflation erodes its purchasing power. Meanwhile, the government hasn’t adjusted tax thresholds upward to reflect rising living costs. Result? You cross into higher tax brackets and pay more tax on the same real income.

Current Frozen Tax Bands (2026/27 Confirmed)

Bands stick frozen—no uprating through 2031. Here’s the table:

Source: HMRC and gov.uk guidance. Without inflation adjustments, 920k more people hit 40% by 2029.

The Historical Normal: What Annual Threshold Uprating Looks Like

From 2011 to 2021, UK tax thresholds were routinely adjusted upward in line with inflation. The Office for Budget Responsibility (OBR) recommended this approach to prevent fiscal drag. However, in 2021, the government halted this practice, freezing all thresholds. This wasn’t a temporary measure, the freeze is now confirmed to persist until at least 2031.

Key Statistic: If thresholds had risen with inflation since 2021, the higher rate threshold (40% bracket) would now be approximately £56,000+ instead of £50,270. That’s a gap of nearly £6,000.

This gap widens annually. By 2031, depending on inflation rates, the gap could exceed £10,000-£15,000 in real terms. That difference translates directly to additional income tax paid.

The Personal Allowance Taper: A Hidden Trap for High Earners

For earners above £100,000, there’s a particularly cruel mechanism at work: the Personal Allowance Taper. While many assume their £12,570 Personal Allowance remains unchanged regardless of income, this assumption is wrong for high earners.

Here’s how the taper works:

• Between £100,000 and £125,140: Your Personal Allowance reduces by £1 for every £2 earned above £100,000
• At £125,140 and above: Your Personal Allowance is completely withdrawn (zero)

The consequence? Earners in this band face an effective marginal tax rate of approximately 60% on income between £100,000 and £125,140. That’s because you’re losing Personal Allowance (worth 20% tax relief) while simultaneously paying 40% income tax. Here’s the impact broken down:

This taper wasn’t created by the 2021 freeze, it predates it. However, the frozen thresholds mean that more earners are caught in this band with each passing year. What was once a trap for the truly wealthy now ensnares mid-to-high earners in London, the South East, and major cities.

The Hidden Cost: Calculating Your Personal Fiscal Drag Impact

How Fiscal Drag Works in Practice

Let’s follow a example. Meet Sarah, a marketing director earning £95,000 in April 2021. She receives a modest 2% annual pay rise (roughly in line with historical wage inflation, though below recent inflation rates). Fast-forward to April 2025: Sarah now earns £102,910 gross.

On paper, Sarah earned an extra £7,910 over four years. However, because tax thresholds haven’t moved, a larger portion of her income now falls into the higher rate band. Here’s the tax impact:

Sarah’s Four-Year Fiscal Drag Cost:

• 2021/22: ~£11,000 taxable above Personal Allowance threshold
• 2025/26: ~£15,000 taxable above Personal Allowance threshold
• Additional tax paid from wage rises alone: ~£1,600+ (over four years)
• This is purely from fiscal drag, not from actual tax rate increases

The 10-Year Cost (2021–2031):

Now consider the full decade. For a £100,000 earner who receives consistent 2% annual wage inflation (a reasonable historical baseline, though recent years have been more volatile), the cumulative fiscal drag cost is substantial.

Conservative estimate: £15,000–£25,000+ in additional tax paid over 10 years purely from fiscal drag, depending on precise income growth.

This calculation assumes:

• 2% annual wage growth (conservative)
• Current tax rates remain unchanged
• No additional income sources (bonuses, investments, etc.)
• National Insurance contributions frozen alongside income tax (which they are)

In reality, many high earners experience variable income (bonuses, commissions, business profits fluctuate). For them, the impact could be higher.

Who Is Most Affected? Income Band Breakdown

The impact of frozen thresholds isn’t uniform. Certain income bands suffer disproportionately:

£100k–£110k Earners (Worst Hit)

This band faces the combined squeeze of Personal Allowance tapering and 40% income tax. The effective marginal rate of 60% means every additional pound earned loses 60p to tax and National Insurance. Over ten years, an earner who progresses from £100k to £112k could lose £8,000–£12,000 to fiscal drag alone.

£110k–£125k Earners (Full Allowance Loss)

By this point, the Personal Allowance is completely withdrawn. The 40% rate applies. While the effective rate drops to 42–45% (including National Insurance), the cumulative ten-year cost is still £12,000–£18,000+.

£125k+ Earners (Additional Rate Threshold Exposure)

Earners approaching the additional rate threshold (£180,000) face a 45% tax rate plus National Insurance. Frozen thresholds mean more earn above this level. Ten-year fiscal drag: £20,000+.

The Office for Budget Responsibility estimates that the long-term freeze on tax thresholds will raise over £29 billion annually for the Treasury by the 2027/28 tax year. With the freeze now extended until April 2031, the annual yield from this ‘fiscal drag’ is forecast to exceed £55 billion by the end of the decade—costing taxpayers the equivalent of a 4p increase in the basic rate of income tax.

8 Proven Fixes to Reduce Your Bill Now

Don’t waitact this tax year. These legal moves reclaim thousands.

1. Max Pension Relief: Contribute £10k at 40-60% relief. £10k costs £6k net, saves £4k tax. Carry forward 3 years’ unused allowance.
2. Salary Sacrifice: Swap £5k pay for pension—dodges tax, NI, and employer NI (saves firm 15%).
3. ISAs: £20k allowance yearly. Gains grow tax-free; shields dividends from 39.35% hit.
4. Marriage Allowance: Transfer £1.26k allowance if spouse earns under £50k—saves £252 basic rate tax.
5. Incorporate if Self-Employed: Ltd company drops your rate to 19-25% corporation tax vs 40-45%.
6. Claim Expenses: Home office (£6/day), travel, kit—deduct before tax bands bite.
7. Personal Savings Allowance: £500 at 40%, £0 at 45%—shift savings here first.
8. Lifetime ISA: Up to £4k/year with 25% bonus (age 18-39); tax-free growth.

Example: £110k earner sacrifices £20k to pension. Saves £12k tax/NI. Nets same take-home, boosts retirement.

Plan with Future Plan: 2031 and Beyond

Freeze ends 2031—maybe. Assume it sticks. Build these habits now: Review yearly, coordinate spouse income, track bonuses. Couples earning £100k each dodge £40k+ drag.

National Insurance Contributions (NICs): The Forgotten Half

Income tax thresholds aren’t the only thing frozen. National Insurance thresholds are also frozen. This compounds fiscal drag significantly.

The employee National Insurance threshold sits at £12,570 (matching the Personal Allowance). For a £100,000 earner, this means:

• Employee NI: 8% on earnings between £12,570 and £50,270 (frozen threshold)
• Employer NI: 15% on all earnings above £9,100 (also frozen)
• Combined hit: Income tax + Employee NI + Employer NI (reduces take-home and employer’s willingness to raise salaries)

For a couple both earning £100,000, the impact is doubled. Combined household fiscal drag could exceed £30,000–£50,000 over the decade.