What Happens If You Earn Over £100k UK — Tax, Benefits & Allowances Impact
What happens when you earn over £100,000 in the UK. How you lose your personal allowance, the 60% tax trap, pension restrictions, child benefit clawback, and strategies to reduce your tax bill.
·5 min read
Earning over £100,000 is a significant milestone — but it triggers multiple tax consequences. Here’s what changes and how to minimise the impact.
The Personal Allowance Trap
How It Works
Income Level
Personal Allowance
Effect
Up to £100,000
£12,570
Full allowance
£100,001-£125,140
Reduced
Lose £1 per £2 over £100k
Over £125,140
£0
No personal allowance
The 60% Tax Trap Explained
Between £100,000 and £125,140, you face an effective 60% marginal tax rate:
Component
Rate
Normal 40% rate
40%
Plus lost allowance (20% on £2 lost per £2 earned)
20%
Effective rate
60%
Example: You earn £110,000
Calculation
Amount
Amount over £100,000
£10,000
Personal allowance lost
£5,000 (half of £10,000)
Extra tax from lost allowance
£2,000 (£5,000 × 40%)
Normal tax on £10,000
£4,000 (40%)
Total extra tax on that £10,000
£6,000 (60%)
Complete Tax Band Picture (2026/27)
Income Band
Tax Rate
Notes
£0-£12,570
0%
Personal Allowance (if eligible)
£12,571-£50,270
20%
Basic rate
£50,271-£100,000
40%
Higher rate
£100,001-£125,140
60% (effective)
Personal allowance taper
£125,141-£150,000
40%
Higher rate (no personal allowance)
Over £150,000
45%
Additional rate
Self Assessment Requirement
You Must File If Income Over £100k
Requirement
Details
Must register
By 5 October after tax year
File deadline
31 January (online)
Paper deadline
31 October (if submitting paper)
Even if PAYE
Still required
Penalties
£100+ for late filing
How to Register
Step
Action
1
Go to gov.uk/register-for-self-assessment
2
Register online
3
Receive UTR (Unique Taxpayer Reference)
4
Set up Government Gateway account
5
File return by deadline
What to Declare
Item
Include
Employment income
P60 figures
Benefits in kind
P11D items
Self-employment
Any side income
Rental income
Property earnings
Interest/dividends
Above allowances
Capital gains
Above annual exemption
High Income Child Benefit Charge
How It Works
Your Income
Charge
Under £60,000
No charge — keep full benefit
£60,000-£80,000
Gradual clawback (1% per £200)
Over £80,000
Full benefit clawed back
Calculating the Charge
Income
Percentage Clawed Back
£60,000
0%
£65,000
25%
£70,000
50%
£75,000
75%
£80,000+
100%
Child Benefit Amounts (2026/27)
Children
Weekly Amount
Annual
First child
£26.05
£1,354.60
Each additional
£17.25
£897.00
2 children total
£43.30
£2,251.60
3 children total
£60.55
£3,148.60
Making the Decision
Option
Best When
Keep claiming
Income close to threshold, cost small
Opt out
Income well over £80k, filing hassle not worth it
Partner claims
They earn less than £60k
Important: Even if you opt out, register for Child Benefit to protect State Pension credits (especially if partner not working).
Pension Restrictions
Annual Allowance Taper
Your “Adjusted Income”
Annual Allowance
Under £260,000
£60,000
£260,000-£360,000
Tapered down
Over £360,000
£10,000 minimum
Taper calculation: Lose £1 of allowance for every £2 over £260,000
Threshold Income
Term
Meaning
Threshold Income
Your income minus pension contributions
If under £200,000
No taper applies (full £60,000)
If over £200,000
Check Adjusted Income
Lifetime Allowance Replacement
From April 2024
New Rules
Lump Sum Allowance
£268,275 tax-free
Lump Sum and Death Benefit Allowance
£1,073,100
Excess taxed
At marginal rate
Tax Strategies for High Earners
1. Pension Contributions (Most Effective)
Strategy
How It Works
Contribute to pension
Reduces “adjusted net income”
Reclaim personal allowance
Get back £1 allowance per £2 contributed
Tax relief
40%/45% relief on contributions
Net cost
Much lower than gross contribution
Example: Earning £125,000
Action
Result
Contribute £25,000 to pension
Adjusted income = £100,000
Personal allowance restored
Full £12,570
Tax saved from restored allowance
£5,028
Plus 40% pension tax relief
£10,000
Pension contribution costs you
£9,972 net
But you get £25,000 in pension
150% effective boost
2. Salary Sacrifice
Item
Tax/NI Savings
Pension
Saves Income Tax and National Insurance
Electric car
Company car tax savings
Cycle to work
Small savings
Childcare vouchers
If had before 2018
3. Charitable Giving with Gift Aid
How It Works
Benefit
Donate to charity
They claim 25% Gift Aid
Claim higher rate relief
Get extra 20%/25% back
Extends basic rate band
Pushes income down
Can restore personal allowance
If planned carefully
4. Investment Schemes
Scheme
Tax Relief
Risk
Venture Capital Trust (VCT)
30% income tax relief
High risk investments
Enterprise Investment Scheme (EIS)
30% relief, CGT deferral
Very high risk
Seed EIS
50% relief
Highest risk
Warning: These are high-risk investments — tax relief shouldn’t be the only reason to invest.
5. ISA Planning
ISA Type
2026/27 Limit
Cash ISA
£20,000 total
Stocks & Shares ISA
Across all types
Lifetime ISA
£4,000 (counts toward total)
Benefit: All growth and income tax-free, no impact on personal allowance calculations.
National Insurance at High Earnings
NI Rates 2026/27
Earnings
NI Rate
£12,570-£50,270
12%
Over £50,270
2%
Note: NI reduces to 2% above Upper Earnings Limit — no additional trap like income tax.
Scottish Income Tax Differences
If You Live in Scotland
Band
Income
Rate
Starter
£12,571-£14,876
19%
Basic
£14,877-£26,561
20%
Intermediate
£26,562-£43,662
21%
Higher
£43,663-£75,000
42%
Advanced
£75,001-£125,140
45%
Top
Over £125,140
48%
The 60% trap still applies (loss of personal allowance), making effective rate even higher in Scotland.
Other Benefits and Allowances Affected
Savings and Dividend Allowances
Allowance
Higher Rate (40%)
Additional Rate (45%)
Personal Savings Allowance
£500
£0
Dividend Allowance
£500
£500
Marriage Allowance
Eligibility
Over £100k
Can transfer?
No — not eligible if higher rate taxpayer
Your spouse can
If they’re basic rate
Student Loan Repayments
Plan
Threshold
Rate
Plan 1
£24,990
9%
Plan 2
£27,295
9%
Plan 4
£31,395
9%
Plan 5
£25,000
9%
Postgraduate
£21,000
6%
High earners: Repay faster due to higher payments, potentially clear debt sooner.