Curated GOV.UK tools

UK Tax Calculators & Official Tools

Verified links to HMRC/GOV.UK calculators for PAYE & NI, SSP, parental leave, VAT deadlines, company car benefits, Self Assessment, VAT number checks and SDLT. All links open in a new tab.

PAYE & National Insurance

Estimate your Income Tax (PAYE) & NI

For employees paying tax via PAYE in the current tax year.

Gov Calculator

Employee National Insurance

Work out employee NI for the current tax year.

Open calculator

Employee Pay

Work out basic pay, NI, Tax and Employer NI for the current tax year.

FK Basic Pay Calculator
Benefits, Leave & Family

Statutory Sick Pay (SSP)

Calculate SSP for eligible employees.

Open calculator

Maternity, Paternity & Adoption

Work out statutory leave and pay.

Open calculator

Child Benefit tax charge

Estimate benefit and any High Income Charge.

Open calculator
VAT

VAT payment deadline

Work out the deadline for your VAT period.

Open calculator

Check a UK VAT number

Validate a UK VAT registration number.

Open tool

Check an EU VAT number (VIES)

Validate EU VAT numbers via the Commission.

Open tool
UK VAT Scheme Comparison & Impact on P&L Trading Profit
Self Assessment & IR35

Check if you need to send a Self Assessment return

Quick eligibility checker.

Open tool

Check employment status for tax (CEST)

Assess employment status / IR35 position.

Open tool

Self-Assessment Tax Estimator

Assess personal tax position.

FK - SA Estimator
Company Cars & SDLT

Company car & fuel benefit

Calculate taxable benefit based on CO₂ etc.

Open calculator

Stamp Duty Land Tax (SDLT)

Official calculator & leasehold guidance.

Rates & guideCalculator (service page)
Corporation Tax & References

Find your UTR

How to locate an organisation’s Unique Taxpayer Reference.

Open guidance

Corporation Tax payment reference

How your 17-character reference works.

Open guidance

Corporation Tax / Dividends Estimator

Calculate CT600 liability and available dividends  

FK - CT / Dividends Estimator
Links reviewed and updated to official sources (GOV.UK/HMRC or EU VIES). HMRC’s IR35 deemed-payment spreadsheet is currently not linked on the official calculators page; use CEST for status checks.