Around three quarters of a million people will begin receiving their annual renewal notices shortly.
HM Revenue and Customs (HMRC) said approximately 730,000 tax credit customers will receive their notices between Thursday, May 2 and Wednesday, June 19.
The majority of these claims will be automatically renewed.
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However, fewer than 10,000 customers will have to check their details and renew their claim by July 31 or risk their payments being stopped.
The most efficient way for customers to renew their tax credits is via the official government website, or through the free HMRC app.
Myrtle Lloyd, HMRC’s director general for customer services, said: "Tax credits are valued by many families for their essential contribution to the monthly family budget, so to avoid payments being stopped please respond to HMRC by the 31 July deadline."
Customers are also reminded to report any significant changes in their life situation, particularly, relationship changes, children leaving home, or a change in working hours, as these could affect their claim.
There's a risk of payments being stopped and the necessity of repaying any overpayments if customers do not renew by the deadline.
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