Tax calculator

Child Benefit Tax Charge Calculator

Estimate Child Benefit and the High Income Child Benefit Charge for 2026/27.

  • Tax year shown with the calculator
  • Assumptions explained
  • Source-linked methodology

2026/27 tax year

Estimate Child Benefit and the tax charge

Estimate your Child Benefit and any High Income Child Benefit Charge using the official 2026/27 weekly rates and adjusted net income thresholds.

Count the eldest or only child and each additional child covered by the award.

For 2026/27, count eligible weeks beginning on a Monday. The maximum is 53.

Use adjusted net income, not salary. Include all taxable income and apply the HMRC adjustments for reliefs.

Did you have a partner throughout all the weeks entered?

Partner includes a spouse, civil partner or someone you lived with as if married, unless permanently separated.

Complete this only if you answered yes. The higher-income partner normally pays the charge.

Did the claimant, number of children, partnership or payment status change during these weeks?

Also choose yes if someone else received Child Benefit for a child living with you. Exact dates affect the statutory calculation.

Your answers are used only for this estimate. They are not added to a lead record or analytics event.

Assumptions and exclusions

This is an initial estimate for 6 April 2026 to 5 April 2027. The tax year contains 53 statutory Child Benefit weeks because each week begins on a Monday; enter only the weeks for which the award applies.

Adjusted net income is total taxable income before Personal Allowances, less specified reliefs. Grossed-up Gift Aid and some pension contributions can reduce it. Use HMRC’s guidance if you have not already worked it out.

The statutory calculation rounds total Child Benefit, the percentage and the charge down to whole units at specified stages. This can leave pence after a 100% charge. Changes of claimant, household, entitlement or payment status require HMRC’s date-based calculator.

Claiming Child Benefit and opting out of payments can preserve National Insurance credits and normally means the child receives a National Insurance number automatically.

How to understand your result

Your result is an estimate for the tax year shown on the calculator. The breakdown lists each step, the rates and thresholds used, and the date the figures were last checked against GOV.UK. Amounts are rounded the way HMRC rounds them where a rule exists.

Each calculator lists what it leaves out, such as other income, reliefs or special cases, so read the assumptions before you rely on the figure. For your own position, check your HMRC online account or speak to a qualified professional.