Note: .ack is no longer a format that is used. It was discontinued in 2013 with the removal of EOL (Online Plus).
|.resptax||The response from the CRA for T1|
|.tax||The T1 tax return|
|.tfx||The T1013 EFILE format|
|.taxX||The T1 tax return that was sent via a batch, where X is a number that represents how many times this return has been attempted to EFILE. |
For example, if you see .tax, .tax0 and .tax1, this return has undergone EFILE three times.
|.resptaxX||Same as .taxX; multiple responses|
|.eax||The TP1 tax return|
|.eaxresp||The TP1 response from Revenu Quebec|
|.eaxX, .eaxrespX||Multiple transmissions and responses|