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.

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Employee National Insurance

Work out employee NI for the current tax year.

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Benefits, Leave & Family

Statutory Sick Pay (SSP)

Calculate SSP for eligible employees.

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Maternity, Paternity & Adoption

Work out statutory leave and pay.

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Child Benefit tax charge

Estimate benefit and any High Income Charge.

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VAT

VAT payment deadline

Work out the deadline for your VAT period.

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Check a UK VAT number

Validate a UK VAT registration number.

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Check an EU VAT number (VIES)

Validate EU VAT numbers via the Commission.

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Self Assessment & IR35

Check if you need to send a Self Assessment return

Quick eligibility checker.

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Check employment status for tax (CEST)

Assess employment status / IR35 position.

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Company Cars & SDLT

Company car & fuel benefit

Calculate taxable benefit based on CO₂ etc.

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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.

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Corporation Tax payment reference

How your 17-character reference works.

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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.