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Self Assessment Tax Payment Calendar

Plan an entered Self Assessment tax bill, balancing payment and payments on account across the next 31 January and 31 July deadlines.

UK · 2026/27Last reviewed 6 August 2026Reviewed after a tax-year or rule changeSource: HMRC — Tax rates

Continue your plan

Useful next calculations

Related to this calculation

Set aside self-employed tax

Separate current tax, balancing payment and January and July cash targets.

Put the payment into the household plan

Keep the full monthly effect visible alongside bills, annual renewals and a savings target.

Rates & 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 realistic UK planning example

Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.

A realistic UK planning example
InputValue
Tax calculation for the year (£)5 years
Payments on account already paid (£)0
Include payments on accountNo

After entering these figures, review balancing payment, due by next 31 january and due by 31 july together rather than in isolation. Then rerun the tool with one input adjusted.

How to read your results

Balancing Payment

The figure produced by this output for the inputs you entered. Change one variable at a time if you want to see what drives it.

Due by Next 31 January

The figure produced by this output for the inputs you entered. Change one variable at a time if you want to see what drives it.

Due by 31 July

The figure produced by this output for the inputs you entered. Change one variable at a time if you want to see what drives it.

Method & assumptionsAuthoritative sources

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.

Frequently asked

The usual deadline is 31 January for a balancing payment and first payment on account, then 31 July for the second payment on account. Check your HMRC statement because your own position can differ.

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