All UK Tax & Freelance Calculators

See your full tax breakdown by band, including the personal allowance taper.

Net salary after income tax, National Insurance, pension, and student loan.

Class 1, 2, and 4 NI — for employees and the self-employed.

Calculate your AMAP claim — 45p/25p for cars, motorcycle, bicycle, passenger supplement.

Inside vs outside IR35 — the real financial difference.

Add or remove VAT at any rate. Includes flat rate scheme calculator.

Work out your January and July Self Assessment advance payments based on last year's tax bill.

Estimate your Self Assessment tax bill before you file.

Tax on dividends stacked correctly above your other income.

Calculate FRS VAT owed across all 20 sectors and compare with standard VAT accounting.

Class 4 NI on self-employed profits — 6% between £12,570 and £50,270, then 2% above. Breakdown by band.

Convert a contractor day rate to an equivalent permanent salary.

HMRC flat-rate home working allowance: 25–50 hrs/mo = £10, 51–100 = £18, 101+ = £26.

Check eligibility and calculate your saving — transfer £1,260 of Personal Allowance to your spouse for up to £252/year.

See if your side-hustle income is covered by the £1,000 trading allowance — or whether actual expenses save more.

Apportionment method — room fraction × time fraction × running costs. Often gives a larger deduction than flat rates.

Side-by-side tax comparison for the same profit level.

Check whether your rental income is covered by the £1,000 property allowance or if actual expenses are better.

Check your Class 2 NI position — treated as paid, automatic credits, or voluntary contributions to protect your State Pension.

See the true cost of pension contributions with income tax relief applied.

Compare take-home under an umbrella company versus direct PAYE.

Plan 1, 2, 4, 5, and Postgraduate — monthly and annual repayments.

Check which self-employed expenses you can deduct from your profits.

Construction Industry Scheme deductions at 20% or 30%.