2025 Canadian Tax Deadlines

Few things create more unnecessary stress — or cost more in penalties and interest — than missing a tax deadline. For individuals and businesses across Saskatchewan, the Canadian tax calendar is a moving target of filing dates, instalment due dates and remittance obligations that span personal income tax, corporate tax, GST and payroll. This guide from BOMCAS Canada sets out the key Canadian tax deadlines you need to know so you can plan ahead, stay compliant and keep more of your money working for you rather than disappearing into avoidable charges.

The Canada Revenue Agency (CRA) administers most of these deadlines, and the consequences of missing them are real: late-filing penalties, daily compound interest, lost benefits and, in repeated cases, escalating penalties. The good news is that almost every deadline is predictable. With a simple calendar and a little preparation, you can turn tax season from a scramble into a routine.

Personal income tax (T1) deadlines

For most individuals in Saskatchewan, the personal income tax return for a given calendar year is due by April 30 of the following year. Any balance owing is also due on April 30 — even if you file later, interest begins to accrue on unpaid amounts from May 1. If you file late and owe money, the CRA charges a late-filing penalty of 5% of the balance owing plus 1% for each full month the return is late, up to 12 months, with steeper penalties for repeat late filers.

If you or your spouse or common-law partner are self-employed, the filing deadline is extended to June 15. However, this is an important trap: any balance owing is still due on April 30. In other words, self-employed taxpayers get extra time to file the paperwork but not extra time to pay. We routinely recommend that self-employed clients estimate and remit their balance by April 30 to avoid interest, then finalise the return before June 15.

Taxpayers who pay by instalments — typically those whose net tax owing exceeds the threshold in the current year and one of the two prior years — face quarterly instalment due dates of March 15, June 15, September 15 and December 15. Missing or underpaying instalments can trigger instalment interest and even instalment penalties, so it pays to track these carefully.

RRSP contribution deadline

To deduct a Registered Retirement Savings Plan (RRSP) contribution against a given tax year, you generally must contribute within the first 60 days of the following year — usually around March 1. This is one of the most valuable planning levers available to Saskatchewan taxpayers, because a well-timed RRSP contribution can reduce taxable income and, in many cases, generate a refund. We help clients calculate the optimal contribution based on their marginal rate and contribution room.

Corporate tax (T2) deadlines

Corporations must file a T2 corporate income tax return no later than six months after the end of their fiscal year. For example, a corporation with a December 31 year-end must file by June 30. The payment deadline, however, is earlier and more nuanced: corporate tax balances are generally due two months after year-end, extended to three months for many Canadian-controlled private corporations (CCPCs) that qualify for the small business deduction. Because the payment is due before the filing deadline, planning cash flow around these dates is essential.

Corporations are also generally required to pay tax by monthly or quarterly instalments throughout the year. Eligible small CCPCs may qualify to make quarterly rather than monthly instalments, easing administrative burden and helping cash flow.

GST filing deadlines

GST deadlines depend on your assigned reporting period — monthly, quarterly or annually. Monthly and quarterly filers must generally file and remit one month after the end of the reporting period. Annual filers usually have three months after year-end to file and remit, though many annual filers who are individuals with a December year-end align with the June 15 date while still owing any balance by April 30. Getting your reporting period right, and filing on time, avoids penalties and keeps your input tax credits flowing.

Payroll remittance and T4 deadlines

Employers must remit source deductions (income tax, Canada Pension Plan contributions and Employment Insurance premiums) according to their remitter type — typically by the 15th of the month following the pay period for regular remitters, with accelerated schedules for larger employers. Crucially, T4 and T4A slips and summaries must be filed, and copies provided to employees, by the last day of February following the calendar year. Late or inaccurate payroll filings are among the most common — and most easily avoided — sources of CRA penalties for small businesses.

A simple deadline strategy that works

The clients who never worry about deadlines all do the same thing: they put the dates in a calendar, gather documents early, and work with an accountant who reminds them before — not after — each deadline. At BOMCAS Canada, deadline management is built into how we serve every client. We track your filing dates, prompt you for documents in advance, and prepare returns with time to spare so nothing is ever rushed.

If you are behind on any filing, do not panic and do not ignore it — the situation is almost always fixable, and acting sooner reduces interest and penalties. We help Saskatchewan individuals and businesses catch up through late and back tax return filing and, where appropriate, the CRA Voluntary Disclosures Program. To build a personalised deadline calendar for your situation, book a free consultation with our team today.