Jacks on Tax

By Evelyn Jacks, RWM, MFA, MFA-P, FDFS on December 10, 2025
Estimated reading time: 5 minutes

By Evelyn Jacks, RWM, MFA, MFA-P, FDFS on December 10, 2025
Estimated reading time: 5 minutes

Completing and filing your missed returns now can save you a bundle (and possibly even jail time) later.

The last day on which tax practitioners can electronically file clients’ returns for tax years 2017 to 2024, as well as amended T1 returns for 2021 to 2024 using ReFILE services, before an annual month-long pause, is January 30, 2026. But there are important reasons for late T1 filers to add tax preparation to their holiday “to do” list and get any missed returns filed well before December 31.

Consider the following:

The backdrop. Under the Income Tax Act, the normal reassessment period is three years from the date the notice of assessment or reassessment is mailed or received. However, under the taxpayer relief provisions, it is possible to request adjustments for errors or omissions for personal returns for 10 years.

Tax year 2015 in focus. Tax year 2015 will become statute-barred under the 10-year taxpayer relief provisions after December 31, 2025. That means, for the 2015 tax year, the following opportunities to save tax dollars now and in the future will be lost:

Spousal returns could be affected. When one spouse fails to file, it means that........

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