Free UK tax tools — updated 2025/26
Britvex Tax & Finance
Calculator Suite
Calculator Suite
Professional-grade UK tax calculators used by accountants, directors, landlords and business owners. All tools free, all rates updated for 2025/26.
11
Free calculators
2025/26
HMRC rates
100%
Free to use
Full suite
⭐ Most used
UK Tax Calculator
Complete personal and business tax calculator. PAYE, self-employed, rental, dividends, CGT, Ltd company, contractor. Filing assistant and deadline tracker included.
Business
VAT Calculator
Add or remove VAT, complete VAT return, flat rate scheme comparison, and VAT registration threshold checker. 5 modes in one tool.
Business
🔥 Popular
Sole Trader vs Ltd Company
Enter one profit figure and see a full side-by-side comparison of both structures. Tax, NI, take-home and an automatic recommendation.
Planning
🔥 Popular
Salary vs Dividend Optimiser
Find the most tax-efficient salary and dividend split for Ltd company directors. Live sliders with 4 scenarios compared instantly.
Planning
Marginal Tax & Profit Planning
See your marginal tax rate and get warned about the dangerous thresholds — the 60% trap, Child Benefit clawback, and Personal Allowance taper.
Benefits
Universal Credit Estimator
Estimate your monthly UC entitlement including housing, child, childcare and disability elements. Compares UC childcare vs Tax-Free Childcare.
Business
Break-even Calculator
Calculate break-even units and revenue, contribution margin, margin of safety and units needed to hit a profit target. Essential for business planning.
Benefits
Tax-Free Childcare Calculator
Calculate your government top-up, check eligibility, and compare TFC with UC childcare support and employer vouchers. Includes free hours checker.
International
UK Tax Residency Checker
Apply HMRC’s Statutory Residence Test to determine if you are UK tax resident. Covers automatic overseas tests, automatic UK tests, and sufficient ties test.
Contractor
🔥 Popular
IR35 Status Checker
Answer 10 HMRC determining factors and get an instant IR35 status verdict. Shows the financial impact of inside vs outside IR35 based on your day rate.
Advanced
⭐ New
Multi-Income Optimiser
Combine salary, self-employment, rental, dividends, capital gains and Ltd company profit into one calculation. Finds optimisation opportunities across all sources.
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Need professional tax advice?
Our calculators give you the numbers. Our team gives you the strategy. Speak to a Britvex adviser about your tax position.
All calculators use 2025/26 HMRC rates. Estimates only — not financial advice. Always consult a qualified adviser. © Britvex.com