25 free calculators and tools for UK businesses, sole traders, and contractors. All updated for the 2025/26 tax year.
Showing 25 tools
Calculate your company's corporation tax liability for the current tax year, including marginal relief.
Add or remove VAT from any amount. Supports standard (20%), reduced (5%), and zero rates.
Estimate your Income Tax and National Insurance as a self-employed sole trader for 2025/26.
Find the most tax-efficient split between salary and dividends for limited company directors.
Assess whether your contract falls inside or outside IR35 with our guided questionnaire.
Calculate the tax you owe on dividend income above the annual dividend allowance.
Calculate the sales volume needed to cover your fixed and variable costs.
Build a 12-month cash flow forecast to plan ahead and manage your business finances.
Calculate gross profit margin, net profit margin, and markup for your products or services.
Calculate monthly repayments, total interest, and the true cost of a business loan.
Estimate the total cost of launching your business, from setup fees to first-year running costs.
Compare the annual cost of different accounting software packages based on your needs.
Calculate employer and employee NI contributions, PAYE tax, and net pay for your staff.
Calculate auto-enrolment pension contributions for employers and employees.
Calculate statutory redundancy pay based on age, length of service, and weekly pay.
Calculate statutory holiday entitlement for full-time, part-time, and irregular hours workers.
Calculate HMRC-approved mileage allowance payments for business travel.
Calculate your allowable home office expenses using HMRC's simplified or actual cost method.
Calculate statutory interest and compensation owed on late commercial payments.
Compare take-home pay as an umbrella contractor versus a limited company director.
Estimate your potential R&D tax credit claim under the RDEC or SME scheme.
Check whether your business is ready for Making Tax Digital and what steps you need to take.
View all key HMRC tax deadlines for the 2025/26 and 2026/27 tax years in one place.
Plan your annual business budget with income, expenses, and variance tracking.
Get a rough estimate of what you should expect to pay an accountant based on your business type.
All calculators are for guidance only and do not constitute financial or tax advice. Figures are based on current HMRC rates for the 2025/26 tax year. Always verify with a qualified accountant or HMRC directly.