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Payments on Account Calculator

Last updated: 10 July 2026Information correct for tax year: 2026/27

Use this payments on account calculator to test a UK scenario. Enter your own figures, review the formula trace and compare the result with the official source before making a material decision.

By FinanceHub UK Editorial TeamReviewed by role: Chartered tax adviserCalculations run in your browser

Quick answer

Payments on Account Calculator provides a transparent UK planning estimate using the inputs shown, a visible formula trace and a versioned 2026/27 method. Check every statutory rate or threshold against the linked official source. The result is educational and is not an official assessment, provider quote or personalised advice.

Calculator

Enter your numbers

Enter the amount used for payments on account.
Enter tax deducted at source.

How to use this calculator

  1. Enter figures for one clearly defined scenario.
  2. Check the effective date, jurisdiction and official source.
  3. Review the formula trace and test a second scenario before acting.

Explanation

What it is

Payments on Account Calculator provides a transparent UK planning estimate using the inputs shown, a visible formula trace and a versioned 2026/27 method. Check every statutory rate or threshold against the linked official source. The result is educational and is not an official assessment, provider quote or personalised advice.

How it works

Payments on account can be reduced or not required in specified circumstances; check the HMRC statement.

When to use it

Use it to compare scenarios, prepare questions and understand the effect of each input before checking the official assessment or provider terms.

Limitations

  • The result is an estimate based only on the displayed inputs.
  • Rates, thresholds and provider terms may change after the effective date.
  • The tool does not replace an official calculation, regulated advice or a personalised offer.

Key terms

Estimate
A result produced from the displayed inputs and assumptions, not a guaranteed outcome.
Effective date
The date or tax year for which a changing rule or rate has been checked.
Formula trace
The visible sequence showing how inputs become the result.

Formula

How we calculate this

Payments on account can be reduced or not required in specified circumstances; check the HMRC statement.

Each payment on account = 50% of the qualifying previous-year amount

Statutory or methodological reference:GOV.UK official guidance — Self Assessment Tax Returns.

Formula trace: Aggregate taxable income and gains, allowances, payments on account, student-loan and class 4 NI where applicable; reconcile to HMRC calculation and tax-year rules.

Worked example

Use £55,000 turnover and £15,000 allowable expenses, producing £40,000 illustrative profit before any other income, reliefs, losses, student-loan deductions or payments on account. Check the governing rule at GOV.UK official guidance — Self Assessment Tax Returns.

FAQ

What does the payments on account calculator calculate?

Payments on account can be reduced or not required in specified circumstances; check the HMRC statement.

Which source should I check?

Use the linked GOV.UK official guidance — Self Assessment Tax Returns page and confirm that its effective date matches your scenario.

Is the result an official assessment?

No. It is an educational estimate and may omit facts used by an authority, adviser or provider.

Why can my real result differ?

Pay-period rules, tax codes, household facts, reliefs, fees, provider criteria and later policy changes can alter the result.

When should I recalculate?

Recalculate after any change in income, balance, rate, term, tax year, household facts or official policy.

Common mistakes

  • Mixing monthly and annual inputs.
  • Using an old or promotional rate without checking its date and conditions.
  • Treating an estimate as a binding decision or guaranteed product outcome.

Tips

  • Save the inputs and effective date.
  • Change one assumption at a time.
  • Compare the result with the specific official source before acting.

Related calculators

calculatorVAT Flat Rate Scheme CalculatorVAT Flat Rate Scheme Calculator with a transparent formula, 2026/27 effective date, worked UK example, official sources and visible review status.

Related guides

articleSelf Assessment Tax Return ChecklistSelf Assessment Tax Return Checklist: a detailed UK guide with a direct answer, worked numerical example, official source citations, limitations, review metadata and practical next steps.

Sources and editorial review

Author and review

Author: FinanceHub UK Editorial Team — Editorial. Editorial policy.

Reviewed by role: Chartered tax adviser. Named qualified reviewer sign-off is pending before production.

Review record date: 2026-07-10. Next review due: 2027-03-01.