What Tax Toolkit UK is
Tax Toolkit UK is a free collection of UK tax calculators covering income tax, self assessment, capital gains, dividends, IR35, salary sacrifice, VAT, inheritance tax, and more. Every calculator runs entirely in your browser using HMRC's published rates for the current tax year.
There is no account to create, no email address to hand over, and no figures you enter are sent to any server or stored anywhere. The calculations happen locally on your device and disappear when you close the page.
Why we built it
Most free tax calculators are either too simplified to be genuinely useful, or they are wrapped in paywalls, registration requirements, and upsells. We wanted something that works immediately, covers the full complexity of the UK tax system including Scottish rates, Section 24, payments on account, and employer NI changes, and treats users as intelligent adults who just need the numbers.
Every tool on this site is accompanied by a plain-English explanation of the underlying rules so you understand not just what the number is but why it is what it is.
Accuracy and limitations
All calculators use HMRC's published rates and thresholds for the 2026/27 tax year (6 April 2025 to 5 April 2026). We update them at the start of each tax year when new rates are announced in the Autumn Statement and Spring Budget.
These tools provide estimates for guidance purposes only. They do not constitute professional tax advice. The UK tax system is complex, and individual circumstances, your residency status, specific reliefs you may be entitled to, the precise timing of transactions, and many other factors, can all affect your actual liability. Always verify important figures with HMRC or a qualified tax adviser before making financial decisions.
Privacy
We do not collect personal data. No figures you enter into any calculator are transmitted or stored. See our Privacy Policy for full details.
Contact
Found an error in a calculation? Have a suggestion for a calculator we should add? Use the contact page to get in touch.