An MOT can be carried out at any time.
If the vehicle is presented for test within the calendar month prior to the date that the MOT is due, the test certificate will run from the date of the test to one year after the expiry date of the current certificate (e.g. if the current certificate was due to expire on 1/4/03, and the vehicle was presented on or after 2/3/03, the certificate would run from the test date until 1/4/04). To have this extension, the vehicle owner should present their old certificate to the Test Station to verify that the extra time is applicable. The tester would then write the serial number of the old certificate in the appropriate section of the new certificate.
The same rule would also apply if the vehicle was taken in within a calendar month of its first MOT. In this case, the vehicle owner would need to present their registration document and the serial number from this document will be entered in the "last certificate serial number" box on the MOT.
If the vehicle is tested earlier than one month before its due date, the MOT will only run for twelve months.