Estimate how income above GBP 100,000 can reduce the UK Personal Allowance, including take-home pay, pension salary-sacrifice modelling, tax, NI and student-loan assumptions.
Use this tax-trap calculator to model the Personal Allowance taper around GBP 100,000. It estimates adjusted net income, allowance lost, take-home pay, tax, NI, and a current-year pension salary-sacrifice comparison where the shared guardrails support it.
This is a planning estimate only. It is not tax, payroll, pension, financial, legal or accounting advice.
| Taper status | Inside the taper zone |
|---|---|
| Gross income above GBP 100,000 | £10,000 |
| Adjusted income above target | £10,000 |
| Income Tax / year | £33,432 |
| National Insurance / year | £4,211 |
| Full allowance-loss point | £125,140 |
| Additional sacrifice to model target / year | £10,000 |
|---|---|
| Additional sacrifice to model target / month | £833 |
| Adjusted income after total sacrifice | £100,000 |
| Take-home change / month | -£317 |
| Minimum-wage guardrail | Clear under default assumptions |
Pension salary sacrifice can reduce taxable pay in this current-year PAYE estimate, but employer scheme rules, minimum-wage checks, statutory-pay effects and payroll treatment must be checked separately.
This estimate is above the selected minimum-wage guardrail using the hours and worker category entered. It is not a legal compliance decision.
The April 2029 pension salary-sacrifice National Insurance cap is not applied to this current-year estimate.
Use this tax-trap calculator to model the Personal Allowance taper around GBP 100,000. It estimates adjusted net income, allowance lost, take-home pay, tax, NI, and a current-year pension salary-sacrifice comparison where the shared guardrails support it.
| Tax/source year | 2026/27 |
|---|---|
| Region | England/Wales/Northern Ireland |
| Tax code basis | 1257L |
| Pension basis | No pension deduction unless this example says otherwise |
| Student loan basis | No student loan unless selected in this example |
| Gross pay | Employment pay before PAYE deductions and pension or loan settings. |
|---|---|
| Income Tax | Tax estimated from the selected tax-year, region, tax code and taxable-pay assumptions. |
| National Insurance | Employee NI is calculated separately from Income Tax and may not follow the same bands. |
| Pension and loans | Pension method and student-loan plan can change take-home pay and payslip comparisons. |
| Pension contribution | Changing the rate or method can change taxable income, National Insurance and take-home pay. |
|---|---|
| Tax code and region | Scottish Income Tax, Welsh codes, emergency tax or a non-standard tax code can move the result. |
| Student loan plan | A different plan can change deductions because each plan uses its own threshold and repayment rate. |
| Bonus, overtime or second job | Extra pay and payroll timing can make a real payslip differ from the smooth annual estimate. |
| Tax code | HMRC tax-code changes, K codes, BR/D codes, or emergency markers can change PAYE deductions. |
|---|---|
| Cumulative basis | Week 1, Month 1 or non-cumulative payroll can differ from a smooth annual calculator estimate. |
| Pension method | Relief at source, net pay and salary sacrifice can affect taxable pay and take-home pay differently. |
| Payroll timing | Bonus, overtime, arrears, refunds, cut-off dates and corrections can all move a single payslip. |
| Why does my payslip not match the calculator? | payslip difference |
|---|---|
| What do the main payslip lines mean? | payslip explainer |
| What tax code should I use for modelling? | tax code |
| How much does pension reduce take-home pay? | pension comparison |
| How does this affect a monthly budget? | budget planning |
| What is not decided here | PayBreakdown does not decide payroll correctness, lender approval, benefit entitlement or employer compliance, and does not give regulated financial, mortgage, debt, tax, payroll or legal advice. |
|---|
The figures on this page use the values below. Open the calculator if your example salary, region, student loan or tax code differs.
The calculator uses the shared PAYE salary engine and tax-year source data to estimate whether adjusted net income is below the taper zone, inside it, or at the point where the standard Personal Allowance has tapered away.
Where income is above the selected target, the page can model a current-year pension salary-sacrifice amount that would bring adjusted net income down to that target under the current assumptions.
The indexed examples focus on salaries around the GBP 100,000 taper zone and the point where the standard Personal Allowance is fully lost.
Use this tax-trap calculator to model the Personal Allowance taper around GBP 100,000. It estimates adjusted net income, allowance lost, take-home pay, tax, NI, and a current-year pension salary-sacrifice comparison where the shared guardrails support it. Salary estimates can change when the tax year, UK region, tax code, pension method, student loan plan, pay frequency, bonus, overtime or salary-sacrifice assumptions change.
The useful figure for budgeting is usually take-home pay after Income Tax, National Insurance, pension deductions and student loan deductions. Gross pay helps compare jobs, while net pay is usually the better starting point for bills, savings and borrowing checks.
Real payslips can differ because payroll works by pay period and can include tax-code changes, pension method differences, student-loan starts or stops, taxable benefits, salary sacrifice, bonuses, overtime, arrears, refunds, or rounding. Match the calculator settings to the payslip before treating a difference as meaningful.
Two jobs with the same headline salary can feel different once pension contribution rate, employer pension method, student-loan plan, bonus pattern, overtime, tax code, region, salary sacrifice and pay frequency are considered. Compare the monthly net figure with commuting costs, bills and savings goals before deciding whether a higher gross salary improves the household plan.
Start by matching the pay basis: annual salary, hourly rate, weekly hours, pay frequency and whether the figure is full-year or part-year. Then match the deductions that usually move the result the most: pension method, pension rate, student-loan plan, postgraduate loan, tax code, Scottish or Welsh tax treatment, bonus, overtime, taxable benefits and salary sacrifice. If the page is a comparison page, keep both sides on the same tax year and pension method before reading the difference. If it is a required-salary or pro-rata page, treat the answer as a target estimate and rerun it with a cautious lower-income or higher-deduction scenario before using it for bills, rent, borrowing or savings.
Use the visible result as a starting point, then change the assumptions that apply to your situation. For salary pages, that usually means tax year, region, tax code, pension method, student loan plan, bonus, overtime and salary-sacrifice settings. For borrowing, debt or budget pages, it means the real payment amount, term, interest rate, balance, bill timing, savings target and any expected income change. Keep the result separate from advice or approval decisions: PayBreakdown helps you model the numbers, while official sources, employer records, provider documents and professional support are still the right place for final checks. If a change is close to a threshold, rerun the calculation with a cautious higher-cost or lower-income scenario before relying on the result.
Curated salary examples around the GBP 100,000 taper zone.
Current-year pension-only examples for modelling income toward GBP 100,000.
8 pages in this set, each showing the calculation for a different figure.
6 pages in this set, each showing the calculation for a different figure.
It estimates how the Personal Allowance taper can affect take-home pay when adjusted net income is around or above GBP 100,000, using the selected tax year, region, tax code, pension and student-loan assumptions.
For the current shared tax-year settings, the taper starts when adjusted net income is above GBP 100,000. The standard allowance reduces by GBP 1 for every GBP 2 above that point until it is fully lost.
A current-year pension salary-sacrifice arrangement can reduce taxable cash pay in this model, but it depends on employer rules and must be checked against minimum-wage, statutory-pay and benefit effects.
No. Current-year tax-trap results do not apply the April 2029 pension salary-sacrifice National Insurance cap. That future rule is kept separate from live-year calculator output.
No. It is a planning estimate only. Tax codes, adjusted net income, payroll treatment, benefits, pension rules, student loans and personal circumstances can change the real result.
The Personal Allowance taper is most useful around GBP 100,000 to GBP 125,140, so this cluster keeps examples curated instead of generating broad salary variants.
Last updated 2026-08-19. Estimates are for planning and should be checked against official records where the decision matters.