A pay rise or bonus can feel simple until the payslip lands. Income Tax and National Insurance are only the start. Student loans, adjusted net income, Child Benefit, childcare eligibility, pension allowance and tax codes can all move at the same time.
This page is for sequencing. The bonus/pay-rise calculator owns the numbers; this guide tells you which hidden traps to check before and after the payment.
Scope guard: avoiding overlap
| Use | Boundary |
|---|---|
| Use this page for | The checklist around bonuses, raises, thresholds and household effects. |
| Use another page for | Exact take-home pay or salary sacrifice calculations. |
Before the bonus lands
- Ask whether the bonus can be sacrificed into pension and whether employer National Insurance savings are shared.
- Check adjusted net income if the payment could push you over GBP 60,000, GBP 80,000 or GBP 100,000.
- Check pension annual allowance if a large employer or salary-sacrifice contribution is involved.
- If childcare is relevant, test the GBP 100,000 eligibility cliff before celebrating the gross number.
After the bonus lands
| Issue | Why it happens | What to open |
|---|---|---|
| Tax feels too high | Payroll may apply cumulative tax, student loan, NI and threshold effects in one month. | Bonus/pay-rise calculator. |
| HMRC estimate jumps | PAYE estimate may treat unusual pay as a pattern. | Check current-year Income Tax service. |
| Child Benefit charge appears | Adjusted net income moved above the HICBC threshold. | HICBC calculator. |
| Pension limit risk | Contribution plus employer payment may hit annual allowance or taper. | Annual allowance calculator. |
Bonus route order
- First: calculate take-home pay.
- Second: calculate adjusted net income.
- Third: check Child Benefit and childcare thresholds.
- Fourth: check pension annual allowance and salary sacrifice.
- Fifth: update HMRC estimates if PAYE assumptions are wrong.
The UKTAXDRAG rule
Identify the threshold first, then use the calculator. Hidden tax drag usually comes from stacking effects, not from one visible headline rate.