Free Professional Tools
for UK Finance & Compliance
Free calculators and tools for UK contractors, finance teams, and compliance professionals. VAT, IR35, GDPR fines, salary, data breach costs, risk matrix — no login, no signup.
Finance Tools
5 tools available
VAT Calculator
Instantly add or remove VAT at standard (20%), reduced (5%), or zero rates.
Salary Calculator
Calculate your take-home pay after Income Tax and National Insurance for 2025/26.
IR35 Calculator
Compare your take-home pay inside vs outside IR35 to understand your true net income.
Day Rate Calculator
Convert between day rate and equivalent annual salary — accounting for holidays and downtime.
Rate Converter
Convert your GBP day rate to USD, EUR, AUD and more — or check what a foreign rate is worth in pounds.
Cybersecurity Tools
3 tools available
Password Checker
Check your password strength based on entropy. Passwords are never sent to any server.
Breach Cost Calculator
Estimate the total financial impact of a data breach based on industry, size, and scope.
GDPR Fine Estimator
Estimate your maximum GDPR fine exposure based on violation type and annual global turnover.
Free professional tools for UK finance and compliance
Finance calculators
Our UK finance tools cover the calculations professionals need daily. The UK VAT calculator handles standard (20%), reduced (5%), and zero-rated VAT in both directions. The UK salary calculator uses 2025/26 PAYE and National Insurance bands, including Scottish income tax rates. The IR35 calculator compares inside versus outside IR35 take-home pay for contractors, while the contractor day rate calculator converts between day rates and annual salary equivalents.
Cybersecurity & compliance tools
The GDPR fine estimator models ICO enforcement exposure under UK GDPR based on violation type, global turnover, and mitigating or aggravating factors. The data breach cost calculator estimates total financial impact using IBM benchmark data across detection, notification, response, and lost business categories. The password strength checker analyses entropy and estimated crack time entirely in your browser — no data is ever transmitted.
Business tools
The risk matrix generator produces a colour-coded 5×5 risk matrix following ISO 31000 and ISO 27001 conventions, with a live risk register sorted by score. The meeting cost calculator converts attendee headcount, average salary, and duration into a direct monetary figure, including recurring annual cost. All tools run instantly in your browser with no account or software required.
Built by governance professionals
GovernStack tools are built on real enterprise governance expertise — ISO 27001, SOC 2, GDPR compliance, and financial regulation. These aren't generic calculators. Every tool reflects how professionals actually think about the problem.