Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what estimate he has made of the amount of (a) tax credits and (b) child benefit to which claimants were entitled but did not claim in each year since 2010.

Estimates of the amounts of tax credit which have not been claimed by eligible households are published annually in “Child Benefit, Child Tax Credit and Working Tax Credit Take-up rates” on the gov.uk website. The latest publication relating to 2016-17 is here: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/763597/Child_Benefit__Child_Tax_Credit_and_Working_Tax_Credit_take-up_rates_2016_to_2017.pdf

The table below show estimates of the total amount of tax credit expenditure unclaimed since 2010-11.

Variations in the amounts unclaimed are related to changes in the rates and thresholds in the tax credit system. The proportion of Child Tax Credit expenditure which is claimed has remained at 90 per cent or above since 2010-11, and the proportion of Working Tax Credit expenditure which is claimed has remained at between 83 and 86 per cent over the same period.

The proportion of eligible children who have Child Benefit claimed on their behalf is included in the publication referenced above and remains high at 93 per cent in 2016-17. Information relating to the amounts of Child Benefit unclaimed can only be provided at disproportionate cost.