Useful next calculations
Rates and sources
UK tax rates and thresholds, as published by HMRC. Scotland and Wales have devolved rates for income tax and property transactions.
Source: HMRC — Tax rates. Check the linked guidance and any live quote before acting.
When to use this calculator
- Before accepting a pay change, bonus, pension contribution or salary-sacrifice option.
- When you want a simple take-home estimate before payroll or filing.
- When you are approaching the £100,000 income level and want to see the personal allowance taper.
- When you need to convert between hourly, monthly and annual pay.
A worked example
These are the example figures the calculator opens with.
| Input | Value |
|---|---|
| Tax calculation for the year (£) | £6,000 |
| Payments on account already paid (£) | £0 |
| Include payments on account | No |
For those figures the calculator returns:
- Balancing payment: £6,000.00
- Due by next 31 January: £6,000.00
- Due by 31 July: £0.00
Method & assumptions
This cash-flow tool maps the figures you enter from a Self Assessment calculation or HMRC statement into a balancing payment, the next January amount and the following July payment on account. It also compares the January amount with a tax reserve you have already set aside.
Payments on account are normally two instalments of half the prior tax bill when HMRC says they apply. The tool intentionally asks you to confirm their inclusion instead of deciding the rule from partial information.
It is not a tax return, tax calculation or HMRC statement. Check your live online account and official deadlines, especially if income has changed, you have paid tax through PAYE, or you are considering reducing payments on account.
Common mistakes
- Entering gross income when you really want take-home pay, or vice versa.
- Ignoring pension contributions, deductions or local tax rules that change the result.
- Comparing monthly and annual figures without standardising them first.
- Overlooking National Insurance or student-loan plan differences that apply to you.
What to do next
- Check the same scenario with related pay or deduction calculators.
- Keep a copy of the assumptions so you can compare the next tax year or pay period.
- If you are self-employed, compare this result with the self-employment tax calculator.
- Check whether a small pension contribution change moves take-home pay more than you expect.