As per the Canada Revenue Agency (CRA):
" You must tell the Canada Revenue Agency (CRA) about your new marital status by the end of the following month after your status changed. For example, if your status changed in March, you must tell us by the end of April.
Notify the CRA if:
- you married
- you became common-law
- you separated for more than 90 days (due to a breakdown in the relationship)
- you divorced
- your spouse or common-law partner died
If you have separated, wait until 90 consecutive days have passed before telling us.
We will recalculate your benefits based on your new marital status and adjusted family net income. The adjustment will start the month after your marital status changed. "
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