Child Tax Credits and Working Family Tax Credits Don't miss out on your entitlement to these tax credits. There are strict deadlines for making claims and entitlement can only be backdated for three months. This means that a claim for a full tax year from 5th April needs to be made by 5th July. The credits are limited depending on income and provisionally based on figures for the previous year. They will be adjusted when income for current the year is known and this could lead to a clawback. Please click here to view full details. Please contact us if you would like to discuss this further or need assistance in making a claim.