HMRC have confirmed an update to the Job Retention Scheme in respect of overpayments and errors in claims. If you want to delete a claim in the online service, you must do this within 72 hours.
If you have made an error in a claim that has resulted in an overclaimed amount, you must pay this back to HMRC.
If you are making another claim, then you can tell HMRC about an overclaimed amount as part of this. When you make your next claim you will be asked whether you need to reduce the amount to take account of a previous overclaim. Your new claim amount will be reduced to reflect the overclaimed amount and you should keep a record of this adjustment for 6 years.
If you have made an error in a claim and do not plan to submit further claims, you should contact HMRC to let us know about your error and find out how to pay back any overclaimed amounts. Once you have contacted HMRC you will be given a payment reference number and directed to make a payment.