Use these interactive tools to test tax and financial-planning scenarios with your own numbers, then follow the linked guide to understand the rules behind the result. Everything is organised by topic so the right calculator is easy to find.
Residence & international tax
Planning tools for internationally mobile individuals, UK leavers and new UK residents.
Live tool
UK Statutory Residence Test Tracker
Track UK days, UK workdays, overseas work and leave throughout the tax year. Save your diary, model future trips and import or export spreadsheet data before a residence threshold becomes a problem.
2026/27
FIG + Pension Optimiser
Model whether a Foreign Income and Gains claim is worthwhile and explore the interaction with personal allowances, foreign income, gains and pension contribution relief. It is designed for planning rather than as a filing computation.
Business structure & tax
Compare business structures and see how profit extraction assumptions can change the result.
2026/27 rates
Sole Trader vs Limited Company Tax Simulator
Compare a sole trader with a limited company using your business profit, number of shareholders and the proportion of profit retained in the company. Use it to test how different assumptions affect the relative tax position.
Investing & retirement
Stress-test investment strategies rather than relying on a single optimistic assumption.
Scenario model
Bitcoin HODL Retirement Simulator
Test how a Bitcoin-funded retirement might behave under different growth, inflation, borrowing and crash assumptions. Change the time horizon, leverage and bear-market severity to see how fragile or resilient the strategy may be.
Scenario model
Spread Betting Cash Buffer Calculator
Estimate the additional cash buffer required to withstand a specified adverse price movement in a leveraged spread-betting position. It is a risk-planning model, not a recommendation to use leverage or trade a particular product.
Property & pensions
Practical calculators for pension planning and property transaction costs.
Calculator
Pension Annual Allowance Calculator
Calculate threshold income, adjusted income, tapering and carry-forward availability to support pension contribution planning and understand how the annual-allowance mechanics fit together.
Calculator
Quick Stamp Duty Land Tax Calculator
Estimate Stamp Duty Land Tax on a UK property purchase and use the linked guide to understand the key rates, bands and practical transaction points that affect the result.
Use the numbers to ask a better question
These tools are designed to make planning conversations more concrete, not to replace professional advice. If a result is material to a residence move, tax return, pension contribution, property purchase or investment decision, use the linked guide to understand the assumptions and obtain tailored advice where needed.
Tax rules and rates change, so review the assumptions shown in each calculator before relying on the result.