June 15 Isn't Your Real Self-Employment Tax Deadline in Alberta, Here's the One That Costs You Interest
April 30 already passed, but the interest clock started ticking that day. If you still haven't paid your 2025 tax bill, you're now accruing compound daily interest at roughly 10% annually, even though the CRA gives you until June 15 to file.
The confusion is deliberate. The CRA split the deadlines in a way that catches thousands of self-employed Albertans every year. Here's what actually matters if you're filing as a sole proprietor, contractor, or personal services business in oil and gas, trades, or industrial work.
The Split Deadline: Filing vs. Payment
June 15, 2026 is your filing deadline. That's when the CRA expects your T1 return and your T2125 (Statement of Business or Professional Activities).
April 30, 2026 was your payment deadline. Any tax you owed on your 2025 income was due that day. Miss it, and interest compounds daily from May 1 forward.
Most people hear "June 15" and assume both deadlines match. They don't. The payment grace period ended six weeks before the filing extension kicks in.
The spouse rule: If you're married or common-law and one of you is self-employed, both of you get the June 15 filing extension. That's designed to let you coordinate returns for shared credits and spousal amounts. But the April 30 payment rule still applies to both of you.
Why This Costs Real Money
CRA interest is compounded daily. At the current prescribed rate of 10%, a $15,000 tax bill left unpaid from April 30 to June 15 generates roughly $205 in interest, money you can't deduct, can't dispute, and can't avoid once the clock starts.
For heavy equipment operators, pipeline welders, or railway contractors who routinely owe $20,000+ at tax time, the difference between paying on April 30 and waiting until you file in mid-June can exceed $300.
The CRA does not call. The CRA does not send reminders. The interest just appears on your My Account balance, and you pay it at filing or in installments later.
CPP Hits Harder in 2026
Self-employed Canadians pay both the employer and employee portions of CPP. In 2026, that's 11.9% of your net self-employment earnings, up to a maximum contribution of $8,460.90.
For a $100,000 net income, your CPP bill alone is $8,460.90. Add provincial and federal income tax, and you're routinely looking at $25,000, $35,000 owing at filing. Waiting until June to pay that bill is expensive.
The April 30 strategy: If you can't finalize your books by the end of April, make an estimated payment anyway. You can true it up when you file. Overpay by $2,000 and get a refund, or underpay slightly and owe a small balance at filing. Either outcome is cheaper than six weeks of compound interest on the full amount.
GST/HST Runs on the Same Schedule
If you're registered for GST/HST and file annually, your return is also due June 15. But the payment for any GST you collected in 2025 was due April 30. Same split, same interest trap.
Contractors who invoice $100,000+ annually and collect 5% GST are sitting on $5,000 in trust funds for the CRA. That money was due April 30 regardless of when you file the return.
What to Do Right Now
Log into My Account and check your balance. If you owe money and haven't paid, you're accruing interest right now. The balance updates daily.
Pay what you owe, even if you haven't filed yet. Use the CRA's online payment service or set up a payment through your bank. Reference your SIN and the 2025 tax year.
Set up quarterly installments if you're a repeat filer. If your net tax owing exceeds $3,000 in 2026 and either of the two previous years, the CRA expects quarterly payments in 2027. Miss those and you pay installment interest on top of arrears interest.
Track mileage and capital cost allowance now, not at filing. Service trucks, welding rigs, and specialized equipment qualify for CCA deductions that directly offset the CPP hit. If you're not tracking depreciation on a $60,000 truck, you're leaving thousands on the table.
The June 15 extension is for paperwork. The money was due in April.
April 30 already passed, but the interest clock started ticking that day. If you still haven't paid your 2025 tax bill, you're now accruing compound daily interest at roughly 10% annually, even though the CRA gives you until June 15 to file.
The confusion is deliberate. The CRA split the deadlines in a way that catches thousands of self-employed Albertans every year. Here's what actually matters if you're filing as a sole proprietor, contractor, or personal services business in oil and gas, trades, or industrial work.
The Split Deadline: Filing vs. Payment
June 15, 2026 is your filing deadline. That's when the CRA expects your T1 return and your T2125 (Statement of Business or Professional Activities).
April 30, 2026 was your payment deadline. Any tax you owed on your 2025 income was due that day. Miss it, and interest compounds daily from May 1 forward.
Most people hear "June 15" and assume both deadlines match. They don't. The payment grace period ended six weeks before the filing extension kicks in.
The spouse rule: If you're married or common-law and one of you is self-employed, both of you get the June 15 filing extension. That's designed to let you coordinate returns for shared credits and spousal amounts. But the April 30 payment rule still applies to both of you.
Why This Costs Real Money
CRA interest is compounded daily. At the current prescribed rate of 10%, a $15,000 tax bill left unpaid from April 30 to June 15 generates roughly $205 in interest, money you can't deduct, can't dispute, and can't avoid once the clock starts.
For heavy equipment operators, pipeline welders, or railway contractors who routinely owe $20,000+ at tax time, the difference between paying on April 30 and waiting until you file in mid-June can exceed $300.
The CRA does not call. The CRA does not send reminders. The interest just appears on your My Account balance, and you pay it at filing or in installments later.
CPP Hits Harder in 2026
Self-employed Canadians pay both the employer and employee portions of CPP. In 2026, that's 11.9% of your net self-employment earnings, up to a maximum contribution of $8,460.90.
For a $100,000 net income, your CPP bill alone is $8,460.90. Add provincial and federal income tax, and you're routinely looking at $25,000, $35,000 owing at filing. Waiting until June to pay that bill is expensive.
The April 30 strategy: If you can't finalize your books by the end of April, make an estimated payment anyway. You can true it up when you file. Overpay by $2,000 and get a refund, or underpay slightly and owe a small balance at filing. Either outcome is cheaper than six weeks of compound interest on the full amount.
GST/HST Runs on the Same Schedule
If you're registered for GST/HST and file annually, your return is also due June 15. But the payment for any GST you collected in 2025 was due April 30. Same split, same interest trap.
Contractors who invoice $100,000+ annually and collect 5% GST are sitting on $5,000 in trust funds for the CRA. That money was due April 30 regardless of when you file the return.
What to Do Right Now
The June 15 extension is for paperwork. The money was due in April.
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