On the P11d HMRC require that a NINO or date of birth are entered for the employee. If date of birth and NINO are not known you need to use a default date of birth of 01/01/1901.
On the P11d HMRC require that a NINO or date of birth are entered for the employee. If date of birth and NINO are not known you need to use a default date of birth of 01/01/1901.