Calculator

Self-Employed Tax Calculator

Work from business receipts to profit, annual tax and the money you may need to reserve.

Estimate positive sole-trader profits for one full tax year. Include other employment when relevant. Figures stay in this page; no HMRC login or submission.

Business situation

Business turnover for this tax year (£)

Total receipts before costs and any CIS deductions. For cash basis use money received; use tax-year profit figures for traditional accounts.

Actual allowable business costs (£)

Business costs paid or incurred under your accounting method. Exclude drawings, personal pensions and Income Tax.

Deduction to use for taxable profit

Tax year and annual income

Tax year

Income Tax region

Other annual taxable employment pay (£)

Use the taxable amount before the Personal Allowance. Include taxable benefits; do not use take-home pay.

Taxable savings interest (£)

Include interest within your savings allowance. Leave out ISA interest.

Ordinary dividends outside ISAs (£)

Include the £500 dividend allowance. Leave out property income distributions and foreign-tax-credit cases.

Eligible gross relief-at-source pension (£)

Include tax relief added by the provider: £80 paid is normally £100 gross. Do not repeat deductions already removed from taxable pay.

Eligible gross Gift Aid donations (£)

Include the basic-rate gross-up: a £80 donation is normally £100 gross. Check that enough UK tax covers the charity’s reclaim.

Pension and Gift Aid entries must already qualify for relief. This estimate does not check pension annual allowances, foreign income, property finance costs or specialist reliefs.

NI, student loans and amounts already paid

Had you reached State Pension age before this tax year started?

Undergraduate student-loan plan

If more than one undergraduate plan applies, choose the one with the lowest annual threshold.

Postgraduate loan repayment also applies?

Class 1 employee NI paid at the main rate (£)

For mixed employment and business profit. Ask payroll; exclude employee NI at 2% and employer NI. Enter zero if none.

Income Tax already deducted through PAYE or CIS (£)

Actual tax credits for this tax year. Exclude National Insurance and student loans.

Payments on account already paid for this tax year (£)

Enter both advances for the selected year, not payments for a different year.

Employment income for annual SA loans (£)

Use the prepared SA110 K7 employment amount. For an ordinary job, start with P60 taxable pay and check eligible employment expenses and adjustments. Exclude benefits in kind; do not add back net-pay pension contributions or deduct relief-at-source contributions twice.

Student loan already deducted through PAYE (£)

Use the annual total from your payslips or P60. Do not include voluntary payments to SLC.

Postgraduate loan already deducted through PAYE (£)

Keep the postgraduate total separate from undergraduate loan deductions.

Taxable pension income received (£)

Income received, not pension contributions. Taxable pension income counts for SA loans even when it is £2,000 or less.

Tax liability and payment dates are different

At £50,000 profit in England in 2026/27, with the standard allowance and no other income or reliefs, Income Tax is £7,486 and Class 4 NI is £2,245.80. A first Self Assessment payment can also include an advance towards the following year.

The calculator uses annual income, keeps Class 4 profit separate, credits entered PAYE/CIS tax and loan deductions, and applies the mixed Class 1/Class 4 maximum using actual main-rate NI. It does not reproduce an HMRC return or payroll calculation to the penny.

Use profits attributable to the selected tax year. Loss relief, partnerships, basis-period transition profits, companies, foreign income, VAT, benefits and pension annual-allowance charges need additional rules. Property finance-cost relief and specialist distributions are not included. Pension and Gift Aid inputs must already qualify.

Understand sole-trader tax · A job and a side business · Understand payments on account

Sources checked 12 November 2026: HMRC NI rates and NI age exceptions, payments on account and Self Assessment loans. Check the official MTD eligibility service separately; this free planning tool does not submit digital updates.