UK Tax Tool

Lewis Charles Ltd

About this app

2-IN-1: UK Salary Tax Calculator + Tax Rates Reference Guide • No Internet Connection Required • As Featured on BBC Radio 4 & Sunday Times

PLEASE NOTE THIS APP IS NOT IN ANY WAY AFFILIATED WIH THE UK GOVERNMENT OR HMRC, AND IS NOT IN ANY WAY AN OFFICIAL GOVERNMENT PRODUCT.

THE APP USES PUBLICLY AVAILABLE SOURCES OF INFORMATION FOR TAX CALCULATIONS.

Unlike some free tax calculator apps, Tax Tool has all calculations and data built-in, so there's no need for an internet connection - use it anytime and anywhere, even if you don't have a signal!



Also, in addition to the latest 2025/26 tax year, Tax Tool can calculate all the way back to 2009.





SPECIAL FEATURES



• Perform Reverse Salary Calculations for working out your target salary from the take-home pay you need - useful for job interviews and pay rise negotiations



• View a pocket guide of key UK tax rates, limits and allowances, including Income Tax, National Insurance, Capital Gains Tax, Stamp Duty Land Tax and Pension Schemes





OVERVIEW



Tax Tool is designed for UK taxpayers in paid employment, using the Pay-As-You-Earn (PAYE) system of automatic tax deduction.



It was designed to be comprehensive, but also to be very easy to use and input information, with immediate results.



Choose to enter as much or as little as you want: accuracy is improved if you enter more information and if you enter your Tax Code, but it still gives a useful rough guide if you enter none of these.



A key feature is that it can perform reverse salary calculations. You can enter your desired take-home pay (what you need to receive, after payroll taxes are deducted, to cover your everyday lifestyle) and Tax Tool will instantly work out the salary needed to achieve that target. You can easily flip between these to work out net pay from gross salary or vice-versa.



The app also contains a handy reference for UK tax rates, limits and allowances.



Quick and simple: this is not designed to be a replacement for a full tax return (it doesn’t ask for full details on all your financial affairs), but it does provide a quick and useful estimate of the amount you will receive in your pay packet.





ADDITIONAL FEATURES



• Instant calculations as you type

• Doesn't need an Internet connection

• Shows a detailed breakdown of the calculations, including Income Tax paid at each band

• Flexible periods: enter and view results annually, monthly, four weekly, fortnightly, weekly, daily or hourly

• Calculates your National Insurance contributions, as well as your employer's

• Calculates PAYE tax for the current tax year, and all past years back to 2009/10

• Provides an instant rough guide. Enter optional settings to improve accuracy.



Optional Settings available:

• Scottish tax (SRIT)

• Tax Codes - recognises L, S, M, N, K, T, P, X, Y, BR, D0, D1, NT, 0T, M1 and W1 codes

• Contributions to company pensions (as a percentage or fixed amount). Also supports salary sacrifice pensions and contributions taken from net pay

• Childcare Vouchers

• Student Loan repayments (Pre Sept 2012 and Post Sept 2012 schemes supported)

• Overtime and Bonuses (as a percentage or fixed amount)

• Tax deductions

• Benefits-in-kind

• Contributions to charities

• Salary sacrifice (three types)

• Regular deductions from net pay

• Marriage Allowance transfers

• High Income Child Benefit Charge estimation

• Ability to switch off National Insurance calculations if State Pension Age reached.

What’s new

Updated for 2025/26