Personal & Self Assessment Tax calculators
41 free calculators covering personal & self assessment tax, on 2026/27 and 2025/26 UK rates. Every result shows the bands and assumptions behind it, so you can check the numbers before you act on them.
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Estimate your Self Assessment bill for 2026/27 from self-employed profit, salary and dividends, including income tax, Class 2 and Class 4 National Insurance.
2026/2760% Tax Trap Calculator
See how much of your personal allowance is tapered away between £100,000 and £125,140 and the effective 60% marginal rate you are paying on that slice.
2026/27Adjusted Net Income Calculator
Calculate your adjusted net income for 2026/27 to check the personal allowance taper, Child Benefit charge and pension annual allowance thresholds.
2026/27Basis Period Reform Calculator
Estimate your remaining transition profit and the extra tax due for 2026/27 following basis period reform for sole traders and partnerships.
2026/27Blind Person's Allowance Calculator
Work out the extra tax-free income and tax saving from Blind Person's Allowance for 2026/27, and how much can be transferred to a spouse or partner.
2026/27Business Mileage Calculator
Calculate tax-free mileage claims for 2026/27 using HMRC's approved mileage allowance payment rates for cars, motorcycles and bicycles.
2026/27Charitable Donations Tax Relief Calculator
Calculate the Gift Aid your charity receives and the extra higher or additional rate relief you can claim back through self-assessment in 2026/27.
2026/27Child Benefit Calculator
Work out your annual Child Benefit for 2026/27 and how much of it is clawed back through the High Income Child Benefit Charge if either partner earns over £60,000.
2026/27CIS Deduction Calculator
Calculate the CIS deduction a contractor must withhold from a subcontractor's payment for 2026/27, splitting out materials and showing net pay.
2026/27CIS Tax Rebate Calculator
Estimate the CIS tax rebate you could be owed for 2026/27 by comparing tax already deducted at source against your actual income tax and Class 4 NI bill.
2026/27Employed and Self-Employed Tax Calculator
Calculate combined income tax and National Insurance for 2026/27 when you have both a PAYE salary and self-employed profit in the same tax year.
2026/27Doctor and Locum Tax Rebate Calculator
Estimate the tax rebate a doctor, locum or healthcare professional can claim for 2026/27 on professional subscriptions, mileage and other job expenses.
2026/27Emergency Tax Calculator
See how much extra tax you may pay under an emergency tax code in 2026/27 when starting a new job, and how much you can expect back once it is corrected.
2026/27Employed vs Self-Employed Calculator
Compare take-home pay for the same income as an employee versus self-employed for 2026/27, including tax, employee NI, employer NI and Class 4 NI.
2026/27Fiscal Drag Calculator
See how frozen personal allowance and higher rate thresholds pull more of your future pay rises into tax over several years for 2026/27 onward.
2026/27High Income Child Benefit Charge Calculator
Calculate the High Income Child Benefit Charge for 2026/27 based on the higher earner's adjusted net income and see the exact percentage clawed back.
2026/27HMRC Late Payment Interest Calculator
Calculate the interest HMRC charges on late-paid tax for 2026/27 using the current late payment rate, and see what it costs to pay a day, week or month late.
2026/27HMRC Interest and Penalties Calculator
Estimate the combined interest and late payment penalty cost of overdue tax for 2026/27, using HMRC's daily interest rate and the penalty percentages you specify.
2026/27Income Tax Calculator
Calculate your UK income tax, National Insurance and take-home pay for 2026/27 across salary and dividend income using the current bands and rates.
2026/27Marriage Allowance Calculator
Check whether you qualify for Marriage Allowance in 2026/27 and see the tax saving from transferring 10% of your personal allowance to your spouse or partner.
2026/27Mileage Allowance Calculator
Work out the tax-free mileage allowance you can pay or claim for business miles in 2026/27 using the HMRC AMAP rates for cars, vans and bikes.
2026/27Mileage Tax Relief Calculator
Find out how much tax relief you can claim when your employer pays less than the AMAP mileage rate, based on your marginal rate of tax for 2026/27.
2026/27P800 Tax Checker
Check whether your PAYE tax code and total tax paid line up with your actual liability for the year, similar to the reconciliation on an HMRC P800.
2026/27Payment on Account Calculator
Calculate your self-assessment payments on account for 2026/27, each set at half of last year's tax bill and due on 31 January and 31 July.
2026/27Personal Savings Allowance Calculator
See how much of your bank and building society interest is tax-free in 2026/27 under the personal savings allowance for your tax band.
2026/27Personal Tax Penalty Calculator
Estimate the HMRC late payment penalties and interest on an overdue personal tax bill, based on how many days and months late it is paid.
2026/27Savings Interest Tax Calculator
Calculate the actual income tax due on savings interest above your personal savings allowance for 2026/27 at your marginal rate.
2026/27Second Job Tax Calculator
See how much tax you will actually pay on a second job or side income once your personal allowance is already used by your main employment.
2026/27Self Assessment Penalty Calculator
Work out HMRC's late filing penalties for a self-assessment tax return submitted after 31 January, from the initial £100 fine upwards.
2026/27Self-Employed Profit Calculator
Work out your taxable trading profit as a sole trader for 2026/27, after allowable expenses or the trading allowance, before any tax is applied.
2026/27Self Employed Tax Calculator
Calculate the income tax and Class 4 National Insurance due on your self-employed profit for 2026/27, plus what you should be setting aside.
2026/27Stealth Tax Calculator
See how frozen tax thresholds quietly increase your tax bill through fiscal drag, and where the effective 60% marginal rate trap applies in 2026/27.
2026/27Student Loan Calculator
Estimate your monthly and annual student loan repayment for 2026/27 based on your income, employment status and repayment plan.
2026/27Student Loan Repayment Calculator
Estimate how many years it will take to clear your outstanding student loan balance given your income, plan and any voluntary overpayments.
2026/27Tax-Free Childcare Calculator
Work out the government top-up available through Tax-Free Childcare for 2026/27, worth 20% of childcare costs up to the annual cap.
2026/27Tax Refund Calculator
Estimate a PAYE tax refund for 2026/27 caused by an emergency tax code, an incomplete year of employment, or unused personal allowance.
2026/27Tax Refund Estimator
Estimate the tax refund available from unclaimed work expenses such as mileage, uniform costs, subscriptions and working from home for 2026/27.
2026/27Transition Profit Calculator
Estimate the spread of transition profit remaining from basis period reform, taxed over five years as sole traders move to tax-year basis.
2026/27Uber Driver Tax Calculator
Estimate the income tax, Class 4 National Insurance and VAT position for Uber and other rideshare drivers operating as self-employed in 2026/27.
2026/27Work From Home Tax Relief Calculator
Calculate the tax relief available for employees required to work from home in 2026/27, using the flat rate weekly allowance at your marginal rate.
2026/27Scottish Income Tax Calculator
Calculate Scottish income tax, National Insurance and take-home pay for 2026/27, then compare the same salary with England. See the difference.
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