PSA2110 | Dealing With PAYE Settlement Agreements: Repaying overpaid tax and Class 1B NICs
From HM Revenue & Customs · PAYE Settlement Agreements
When you become aware that an employer has overpaid PSA tax and/or Class 1B NICs you must arrange for a repayment to be issued to the employer as soon as possible.
In all cases
Time limits
Repayments of overpaid PSA tax fall within Schedule 1AB Taxes Management Act 1970 which state that any claims must be within 4 years of the end of the tax year to which the claim (overpayment) relates.
Repayments of Class 1B NICs fall within Regulation 52, Social Security (Contributions) Regulations 2001 which cover all Class 1 NICs. The time limit for making a repayment claim for these contributions is covered in the National Insurance Manual at NIM37703.