KnowMyPay

The full list

All calculators

162 calculators live so far, across 9 areas of UK money. Every one shows its working, cites gov.uk, and runs privately in your browser.

Tax & pay

Take-home pay calculator Income tax, National Insurance and your real monthly net pay for 2026/27. Employer NI and cost of employment calculator What an employee really costs: 15% employer NI, pension, levy and the reliefs for under-21s and apprentices. NHS pay calculator Agenda for Change 2026/27 bands and pay points, London supplements, tiered pension contributions and monthly take-home. Income tax calculator Income tax alone, band by band, with the £100k taper and National Insurance left out. National Insurance calculator How much employee National Insurance you pay, and how the 8% and 2% rates work. Tax code explainer & refund checker Decode your tax code, see if it looks right, and whether you are owed a refund. Second job tax calculator Your real combined take-home across two jobs, and the NI quirk that saves you money. Bonus tax calculator How much of a bonus you actually keep, and why one payslip over-taxes it. Month-by-month payslip checker What each month’s payslip should say. Cumulative PAYE across the year, so bonus months and mid-year starts finally make sense. Marginal tax rate & 60% trap What your next £1 really costs, charted across every band including the 60% taper and the Child Benefit charge. Hourly pay calculator What today’s shift pays. Slide your rate and hours, with overtime, unpaid breaks and what an extra half hour adds. Shift & timesheet pay Enter each day’s hours to get pay per day, total hours against your contract, and overtime. Hourly to annual salary Turn an hourly rate into weekly, monthly and annual gross, then the take-home. Pro-rata salary calculator Scale a full-time salary to your hours or days, with the pro-rata gross and take-home. Redundancy pay calculator Statutory redundancy pay from age, service and wage, capped, with the £30,000 tax-free rule. Dividend tax calculator Tax on dividends stacked on your other income, with the 2026/27 rates and band split. CGT on a second property A no-login estimate of CGT on a second home or buy-to-let, plus the 60-day deadline. CGT on shares & funds CGT on shares and funds outside an ISA, with the 18% and 24% rates and the 30-day rule. Self Assessment tax estimator Income tax on your profit plus Class 4 NI in one bill, with the Class 2 position explained. Payments on account explainer Why the first Self Assessment bill is about 150%, split into the January and July payments. Side-hustle & Vinted tax calculator Whether your selling is taxable trading or tax-free, plus the £1,000 trading allowance. Freelancer tax set-aside calculator The percentage and monthly amount to save for tax on UK rates, with the payments-on-account uplift. Sole trader vs limited company Take-home as a sole trader vs a company, and the narrow window where a company wins. Umbrella take-home calculator Every pound from the assignment rate to your account: margin, employer NI, levy, holiday, then tax. Day rate to salary converter The permanent salary a contractor day rate is really worth, with lost holiday and pension priced in. Flat Rate VAT vs standard What you keep under the Flat Rate Scheme, including the 16.5% rate, versus standard VAT. VAT registration decision Whether to register for VAT as turnover nears £90,000: register now, wait, or voluntary. VAT calculator (add or remove) Calculate vat calculator (add or remove). Pay rise calculator Calculate pay rise calculator. Overtime pay calculator Calculate overtime pay calculator. Net to gross salary calculator Calculate net to gross salary calculator. Scottish income tax calculator Calculate scottish income tax calculator. Marriage Allowance calculator Calculate marriage allowance calculator. Corporation tax calculator Calculate corporation tax calculator. Inheritance tax calculator Calculate inheritance tax calculator. Emergency tax refund estimator Calculate emergency tax refund estimator. Director salary vs dividend optimiser Calculate director salary vs dividend optimiser. Salary comparison calculator Calculate salary comparison calculator. Class 2 & 4 National Insurance Calculate class 2 & 4 national insurance. Council tax calculator Calculate council tax calculator. Rental income tax calculator Calculate rental income tax calculator. Inside vs outside IR35 Calculate inside vs outside ir35. Holiday pay calculator Calculate holiday pay calculator. Holiday entitlement calculator Statutory 5.6 weeks in days or hours, the 28-day cap, 12.07% accrual for irregular hours, and pro rata for starters and leavers. P11D value calculator Calculate p11d value calculator. Take-home with student loan Calculate take-home with student loan. UK salary percentile Calculate uk salary percentile.

Pensions

Property

Stamp duty calculator (all four nations) SDLT, Scottish LBTT and Welsh LTT in one tool, with first-time-buyer and second-home rules. Second-home stamp duty surcharge The extra stamp duty on a second home or buy-to-let, and when you can reclaim it. Buy-to-let yield & Section 24 Rental yield plus the Section 24 restriction that pushes a higher-rate landlord’s effective tax up. Deposit goal & Lifetime ISA How fast the 25% LISA bonus gets you to a deposit, with the withdrawal penalty warning. Remortgage break-even The month a new deal’s fee is recouped versus your current rate. Mortgage repayment calculator Monthly capital-and-interest payment from loan, rate and term, with total interest. Mortgage affordability calculator Calculate mortgage affordability calculator. Interest-only vs repayment Calculate interest-only vs repayment. Mortgage overpayment calculator Calculate mortgage overpayment calculator. Rent vs buy calculator Calculate rent vs buy calculator. Rental yield calculator Calculate rental yield calculator. First-time buyer stamp duty Calculate first-time buyer stamp duty. House deposit savings goal Calculate house deposit savings goal. Loan-to-value (LTV) calculator Calculate loan-to-value (ltv) calculator. Leasehold & ground rent estimator Calculate leasehold & ground rent estimator. Cost of moving house Calculate cost of moving house. Energy price cap calculator Your yearly and monthly bill at the Ofgem cap rates for October to December 2026, against the £1,723 typical figure. Shared ownership calculator Calculate shared ownership calculator. Buy-to-let mortgage calculator Calculate buy-to-let mortgage calculator. Offset mortgage calculator Calculate offset mortgage calculator. Overpay mortgage or invest Calculate overpay mortgage or invest. Non-resident stamp duty surcharge Calculate non-resident stamp duty surcharge. Help to Buy ISA bonus Calculate help to buy isa bonus.

Car & motoring

Family & children

Health & NHS

Benefits

Student finance

Savings & debt