UK family finance and benefit calculators
Estimate Child Benefit, the high-income charge, Tax-Free Childcare support, Marriage Allowance savings and Gift Aid top-ups.
Choose a family & benefits calculator
Child Benefit calculator UK 2026/27
Estimate gross payments for eligible children.
Family & benefitsChild Benefit tax charge calculator UK 2026/27
Estimate the charge using the higher earner’s adjusted net income.
Family & benefitsMarriage Allowance calculator UK 2026/27
Estimate the couple’s net benefit from transferring an allowance.
Family & benefitsTax-Free Childcare calculator UK
Estimate government support for one eligible child over three months.
Family & benefitsGift Aid calculator UK: charity donation top-up
See what a qualifying donation is worth to a charity.
Family & benefitsFunded childcare cost calculator UK
Estimate your remaining childcare bill after confirmed funded hours, including term-time funding and annualised monthly costs.
Family & benefitsWhere to start
Use Child Benefit to estimate gross payments, then the charge tool to account for the higher earner’s adjusted net income. Keep household budget planning separate from official benefit eligibility.
UK data and coverage
The childcare calculator assumes eligibility is already confirmed. Marriage Allowance is a couple calculation, while Gift Aid requires enough qualifying UK tax to cover charity reclaims.
Each calculator explains the formula, includes a worked example and identifies the assumptions that can affect your result. Official rule tables and dated price references are linked on the relevant pages.
Read the data sources and calculation methodology or browse all UK calculators.