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Understand .tax .resptax EFILE extensions

SOLVEDby IntuitUpdated February 27, 2023

Note: .ack is no longer a format that is used. It was discontinued in 2013 with the removal of EOL (Online Plus).

.resptaxThe response from the CRA for T1
.taxThe T1 tax return
.tfxThe T1013 EFILE format
.taxXThe 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.
Same as .taxX; multiple responses
.eaxThe TP1 tax return
The TP1 response from Revenu Quebec
.eaxX, .eaxrespXMultiple transmissions and responses

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