Tax & Income / Planning Hub

UK Tax Calculators

Understand how current UK tax rules affect income, investments and household finances with tools that separate allowances, thresholds and tax bands clearly.

Open Income Tax CalculatorView all tax tools
Tax year2026/27
Primary sourcesHMRC & GOV.UK
Tax year statedRules are dated rather than presented as timeless.
Band-by-band logicAllowances and thresholds are shown separately.
Official referencesHMRC and GOV.UK are prioritised for tax data.
Educational estimateNot personal tax advice or a filing service.

Income & salary

PAYE, allowances and National Insurance

Research tool

UK Income Tax Calculator

Estimate tax by band, Personal Allowance, taxable income and effective rate.

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UK Salary Calculator

Estimate gross-to-net pay using Income Tax and employee National Insurance.

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National Insurance

Estimate employee Class 1 National Insurance using the current supported rules.

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Self-Employed NI

Estimate National Insurance on self-employed profits and applicable contribution bands.

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Investment & estate tax

Gains, dividends and inheritance

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Capital Gains Tax Calculator

Estimate CGT after the annual exempt amount and relevant rate bands.

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Dividend Tax Calculator

Estimate dividend tax after the dividend allowance across applicable tax bands.

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Inheritance Tax Calculator

Explore nil-rate bands, residence nil-rate band and an estimated estate tax position.

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Other tax-related tools

Repayments and household tax interactions

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Student Loan Calculator

Model repayments under supported UK student loan plans and earnings thresholds.

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Child Benefit Charge

Estimate the High Income Child Benefit Charge and resulting net benefit.

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Tax insights

Plain-English explanations of the rules

Insight

How much Income Tax will I pay?

Understand tax bands, Personal Allowance and PAYE for the current tax year.

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How much National Insurance do I pay?

See how employee National Insurance thresholds and contribution rates work.

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UK tax codes explained

Understand common PAYE tax codes and what they can mean for take-home pay.

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Tax-year note: Casvia's tax-sensitive tools state the tax year they use and prioritise HMRC and GOV.UK sources. Rules can change and personal circumstances can alter the result. These tools provide educational estimates, not tax advice.