The IRmark on a tax return will change if you:
- make changes to the entries on the return
- remove a figure and re-enter it as it was before.
The IRmark shouldn't change if you amend anything outside of the return, such as an email address or filing credentials.
Please note that when a software update is done, the IRmark is likely to change. We therefore recommend that you keep a PDF copy of all documents before attempting submission (or just after submission with the FBI receipt attached).
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