If one didn't pay by April 30 and CRA issues the notice of assessment on May 15, the notice may say pay amount owing and interest by June 1 to avoid additional interest. One still needs to pay interest for May 1 to 15.

If one also does not pay by June 1, then one will owe interest from May 1 to when one pays instead of from May 1 to 15.

CRA likely does that to recognize that Canada Post does not deliver the notices to the taxpayer the same day they are issued.

The Canada Revenue Agency (CRA) specifies April 30 as the legal deadline for filing and paying taxes to avoid penalties. The later date (e.g., mid-May) sometimes seen on a Notice of Assessment (NOA) is a "grace period" buffer to account for processing time, allowing taxpayers to pay the calculated balance without additional interest accruing after April 30, provided they filed on time.

Key Takeaways:
Official Deadline: April 30 is the legal deadline for payment, as noted by the CRA on Facebook.
The Buffer Date: The later date on your NOA is simply the date by which the CRA guarantees no extra interest will be added, as outlined in Understanding Interest on Canada.ca.
Risk Mitigation: The best way to avoid all penalties is to file and pay on or before April 30. If you cannot pay, filing on time prevents the 5% late-filing penalty.
Self-Employed: While you have until June 15 to file, any balance owing is still due by April 30.

In short: Always aim for April 30. The later date is a courtesy buffer if your assessment was finalized late, not a new official deadline.

But after filing taxes CRA site says: To avoid additional interest charges please pay by May 13, 2026.

So who is right and why this new due date is here?
Anybody ever paid taxes due after end of April without paying fine + interest (personal tax, not business or whatnot)?

Actually if CRA ultimately succeeds in 'doing simple returns' for a considerable number of taxpayers, that would likely cover off a lot of returns that are not T1 Finals. There were just over 2 million paper filings last year, so other than some paper T1 Finals, it would be interesting to know the profiles of the bulk of the paper filings.

I'd give it another 2-3 years, and the CRA will most likely Nix the Paper returns, altogether.

'Gone' - just like the Dodo Bird . . .

Dean

Each year, CRA T1 filing statistics show a somewhat steady decline in paper returns being submitted. It is not worth the cost to make paper packages available any more.

I did my tax return in a few hours at my desk and netfiled thereafter and got my NOA from MyAccount in minutes thereafter.

COIN said
Does anyone know where one can go and get a paper T1 tax return and related schedules here in Toronto? I tried the Canada Post stations and was told that tax forms are no longer available at the post office. I tried 1 Front Street and all the doors are locked with signs that say"Go Away". Why does the CRA make it impossible to get a paper T1? I suppose one could call them on the telephone. Good luck if you can get through and pray the Canada Post workers don't go on strike.  

You could order the T1 tax return online and have it mailed to your residence. It took about 2 weeks for it to arrive for me. Or you could print it out at 'Canada.ca' website.

https://apps.cra-arc.gc.ca/ebc.....cale=en_CA

What can I do now to access my CRA account online?