- What starts the clock
- The end of the calendar year for which the OASRI is being filed.
- How long
- No later than April 30 of the following year (the page's example: the OASRI for 2025 must be filed no later than April 30, 2026).
- What is lost
- If Part XIII.2 tax is owed for the year and the return is filed late, the CRA charges a late filing penalty of 5 percent of the balance owing plus 1 percent of the balance owing for each full month the return is late, to a maximum of 12 months.
Non-resident OAS pensioners subject to the Part XIII.2 tax must file the annual Old Age Security Return of Income by April 30 of the following year.
What the source does not say
The page does not state that OAS payments stop the following July if the OASRI is not filed on time. It only says filing on time helps ensure the pension is not suspended by Service Canada; it does not name a specific suspension month or date. Our archive's 'stops the following July' consequence could not be confirmed on this page and is not included.