Maybe not in time for many people (assuming on-time filing), but perhaps useful for the future:
After much messing around, I got StudioTax personal tax software to run on Linux using Wine! Better, yet, I also got it running in Wine in firejail to keep the Windows software jailed up unable to misbehave.
StudioTax is 100% free (as in beer, but not as in FLOSS) Canadian personal (and sm.bus sole prop. non-T2 business) tax software (donation-ware). Brad & I have been using them for years, ever since CoolTax stopped. If you're half decent at accounting and taxes, forget for-pay QuickTax/TurboTax!
It's a bit trickier than most other Windows software on Wine because it requires .NET 4.5 and .NET needs quite a few tricks to work in Wine and firejail (ugh).
I'm having lots of fun with wine/dosbox (and firejail!) lately and I've *nearly* gotten to the point where I do not require a Windbloze box anymore. Just an ancient Quickbooks (should be easy) and EAC (maybe not so much) to go and I may just turn my Windbloze box off for good!
-- Trevor - taking MUUGers' I-use-Windows-as-my-desktop excuses away, 1 exe at a time