HMRC is reminding tax credits claimants that they have one month to renew their claims by the 31 July deadline or their payments might stop.
Tax credits renewal packs have been sent to about 5.8m people since April. Claimants are asked to act as soon as they receive a pack and last year more than 80% of claimants renewed by the deadline.
Nick Lodge, HMRC director general of benefits and credits, said: 'We are asking claimants to renew early, to renew accurately and to renew on time. The sooner they renew, the sooner we can check payments are correct, meaning we avoid paying too little, or too much money that they will then have to pay back.'
HMRC also asks claimants to check the accuracy of the information in the pack, and to inform the department about any changes to their circumstances, such as to working hours, childcare costs or pay. They must, in addition, tell HMRC whether they are single or living with a partner. HMRC says in some cases it may write to claimants and ask for further information and documents so that the department can check that the information provided is correct.