| APD1 | APD registration form |
| APD2 | Monthly APD return |
| APD21 | Error return enquiry |
| APD24 | Repayment verification request |
| APD30 | Warning of penalty |
| APD31 | Notice of penalty assessment (Computer generated) |
| APD32 | Notice of penalty assessment (Amendment) (Computer generated) |
| APD34 | Notice of supplementary penalty assessment (Computer generated) |
| APD35 | Notice of assessment(s) (Computer generated) |
| APD36 | Notice of assessment (voluntary disclosure) (Computer generated) |
| APD37 | Notice of interest (Computer generated) |
| APD38 | Notice of amendment of assessment (Computer generated) |
| APD39 | Notice of amendment of assessment (Voluntary disclosure) (Computer generated) |
| APD40 | Assessment of civil penalty |
| APD41 | Failure to pay penalty - manual amendment |
| APD641 | Officers Assessment/Voluntary Disclosure |
| APD642 | Amendment to Officer’s Assessment |
| APD643 | Withdrawal of Officer’s Assessment/Voluntary Disclosure |
