Independent writing on tax-smart planning, mortgage strategy, and retirement building. For Canadian professionals who want the whole picture, not just a piece of it.
Ontario Small Business Tax Cut 2026: Claim Your Prorated Savings Before December 31
The 2026 tax year arrives with a split personality for Ontario CCPCs and the self-employed who operate through them. January through June, the small business corporate rate sits at 3.2%. On July 1, it drops to 2.2%. That one-point cut matters more than the number suggests, because most owner-managers don't earn evenly across twelve months.
A contractor who invoices $280,000 between January and June, then another $220,000 in the back half, will pay materially more tax than one who reverses that timing. The difference runs past $5,000 for many professional corporations and consulting shops. The deadline to influence which side of July 1 your income lands is tight. December 31 ends the year. The choices you make in November reshape the bill.
What Changed and When
Ontario's March 2026 budget cut the small business corporate tax rate from 3.2% to 2.2%, effective July 1, 2026. Bill 12 confirmed it. Quebec announced a parallel cut weeks later. The rate at your corporation will pay in June and the rate it pays in August differ by a full point. A professional corporation billing $470,000 in active business income this year will save roughly $4,700 if every dollar lands after July 1. Most won't. Most straddle. And the proration math catches nearly everyone off-guard the first time they file.
What Changed and When
Ontario's March 2026 budget cut the small business corporate tax rate from 3.2% to 2.2%, effective July 1, 2026. Bill 12 confirmed it. Quebec announced a parallel cut weeks later. The rate applies to the first $500,000 of active business income earned by Canadian-Controlled Private Corporations. Above that threshold, the general corporate rate of 11.5% applies provincially (plus 15% federally).
Combined with the 9% federal small business rate, Ontario CCPCs now pay 11.2% on eligible income earned after June 30. The first half of the year remains at 12.2%. For a corporation with a calendar year-end, the blended rate for 2026 works out to roughly 11.7%, 181 days at 3.2%, 184 days at 2.2%.
Who Actually Saves and How Much
A corporation earning exactly $500,000 in active income saves $5,000 annually once the full cut is in place. For 2026, assuming even income distribution across twelve months, the savings drop to about $2,500 because only half the year qualifies for the lower rate.
But income is never even. A consulting firm that bills $320,000 between January and June, then $180,000 in the second half, leaves $1,400 on the table compared to one that reverses the timing. A family medicine professional corporation that processes most billings in Q1 and Q2, because summer patient volume drops, will see materially less benefit than a litigation shop that invoices heavily in Q4.
Proration Hits Non-Calendar Year-Ends Hardest
Corporations with fiscal year-ends other than December 31 face a tighter calculation. A June 30, 2027 year-end spans 365 days at the new 2.2% rate. A September 30, 2026 year-end captures only 92 days at the lower rate out of 365 total. The blended rate for that September filer sits near 11.95%, far closer to the old rate than the new one.
CRA requires day-count proration. You calculate provincial tax separately for income earned before July 1 and income earned after, then sum the two. Most tax software handles this automatically, but the input requires accurate income allocation by period. If your bookkeeping lumps revenue by quarter, not by month, you'll need to break it down further for the T2.
Actions That Actually Move the Number
1. Defer Large Invoices Past June 30
If you typically invoice on the last day of each month and a client owes you $80,000, bill it July 2 instead of June 30. The $800 difference (1% of $80,000) covers the cost of a junior accountant for a week. This works for accrual-basis corporations and for cash-basis filers who recognize income on receipt.
2. Accelerate Deductible Expenses Into Q2
Capital cost allowance claims, discretionary bonuses to yourself as shareholder-employee, and prepaid expenses (where CRA permits) all reduce active business income. Loading them into the first half of the year, taxed at the higher rate, pulls down the income exposed to 3.2%. A $40,000 CRA-compliant prepayment in June saves $1,280 (3.2%) versus the same prepayment in August, which saves $880 (2.2%).
3. True Up Instalments Before December 31
Corporate instalment requirements don't change mid-year based on rate cuts. If you've been remitting based on prior-year tax, you may be overpaying. Run a projection now. If your 2026 liability drops by $2,500, reduce your December instalment by that amount to avoid an interest-free loan to CRA until you file in 2027.
4. Check Whether You're Still Under the $500,000 Ceiling
The small business deduction phases out for corporations with passive investment income over $50,000 annually. Every dollar of passive income above that threshold reduces the $500,000 limit by five dollars. At $150,000 in passive income, the limit disappears entirely. If your corporation holds significant GICs or dividend-paying stocks, the rate cut may not apply to you at all. This is not new, it's been federal law since 2019, but it consistently surprises owner-managers who assume the $500,000 threshold is automatic.
5. Confirm Your CCPC Status
The rate applies only to Canadian-Controlled Private Corporations. If a non-resident owns more than 50% of voting shares, or if your corporation is publicly traded, you don't qualify. If ownership changed hands in 2026, verify status with your accountant before year-end.
The Deadline
December 31 closes the books. Income and expenses recognized after that date land in the next taxation year. For most calendar-year CCPCs, that means no further opportunity to shift 2026 income across the July 1 line. The timing choices that matter happen in November.
The 2026 tax year arrives with a split personality for Ontario CCPCs and the self-employed who operate through them. January through June, the small business corporate rate sits at 3.2%. On July 1, it drops to 2.2%. That one-point cut matters more than the number suggests, because most owner-managers don't earn evenly across twelve months.
A contractor who invoices $280,000 between January and June, then another $220,000 in the back half, will pay materially more tax than one who reverses that timing. The difference runs past $5,000 for many professional corporations and consulting shops. The deadline to influence which side of July 1 your income lands is tight. December 31 ends the year. The choices you make in November reshape the bill.
What Changed and When
Ontario's March 2026 budget cut the small business corporate tax rate from 3.2% to 2.2%, effective July 1, 2026. Bill 12 confirmed it. Quebec announced a parallel cut weeks later. The rate at your corporation will pay in June and the rate it pays in August differ by a full point. A professional corporation billing $470,000 in active business income this year will save roughly $4,700 if every dollar lands after July 1. Most won't. Most straddle. And the proration math catches nearly everyone off-guard the first time they file.
What Changed and When
Ontario's March 2026 budget cut the small business corporate tax rate from 3.2% to 2.2%, effective July 1, 2026. Bill 12 confirmed it. Quebec announced a parallel cut weeks later. The rate applies to the first $500,000 of active business income earned by Canadian-Controlled Private Corporations. Above that threshold, the general corporate rate of 11.5% applies provincially (plus 15% federally).
Combined with the 9% federal small business rate, Ontario CCPCs now pay 11.2% on eligible income earned after June 30. The first half of the year remains at 12.2%. For a corporation with a calendar year-end, the blended rate for 2026 works out to roughly 11.7%, 181 days at 3.2%, 184 days at 2.2%.
Who Actually Saves and How Much
A corporation earning exactly $500,000 in active income saves $5,000 annually once the full cut is in place. For 2026, assuming even income distribution across twelve months, the savings drop to about $2,500 because only half the year qualifies for the lower rate.
But income is never even. A consulting firm that bills $320,000 between January and June, then $180,000 in the second half, leaves $1,400 on the table compared to one that reverses the timing. A family medicine professional corporation that processes most billings in Q1 and Q2, because summer patient volume drops, will see materially less benefit than a litigation shop that invoices heavily in Q4.
Proration Hits Non-Calendar Year-Ends Hardest
Corporations with fiscal year-ends other than December 31 face a tighter calculation. A June 30, 2027 year-end spans 365 days at the new 2.2% rate. A September 30, 2026 year-end captures only 92 days at the lower rate out of 365 total. The blended rate for that September filer sits near 11.95%, far closer to the old rate than the new one.
CRA requires day-count proration. You calculate provincial tax separately for income earned before July 1 and income earned after, then sum the two. Most tax software handles this automatically, but the input requires accurate income allocation by period. If your bookkeeping lumps revenue by quarter, not by month, you'll need to break it down further for the T2.
Actions That Actually Move the Number
1. Defer Large Invoices Past June 30
If you typically invoice on the last day of each month and a client owes you $80,000, bill it July 2 instead of June 30. The $800 difference (1% of $80,000) covers the cost of a junior accountant for a week. This works for accrual-basis corporations and for cash-basis filers who recognize income on receipt.
2. Accelerate Deductible Expenses Into Q2
Capital cost allowance claims, discretionary bonuses to yourself as shareholder-employee, and prepaid expenses (where CRA permits) all reduce active business income. Loading them into the first half of the year, taxed at the higher rate, pulls down the income exposed to 3.2%. A $40,000 CRA-compliant prepayment in June saves $1,280 (3.2%) versus the same prepayment in August, which saves $880 (2.2%).
3. True Up Instalments Before December 31
Corporate instalment requirements don't change mid-year based on rate cuts. If you've been remitting based on prior-year tax, you may be overpaying. Run a projection now. If your 2026 liability drops by $2,500, reduce your December instalment by that amount to avoid an interest-free loan to CRA until you file in 2027.
4. Check Whether You're Still Under the $500,000 Ceiling
The small business deduction phases out for corporations with passive investment income over $50,000 annually. Every dollar of passive income above that threshold reduces the $500,000 limit by five dollars. At $150,000 in passive income, the limit disappears entirely. If your corporation holds significant GICs or dividend-paying stocks, the rate cut may not apply to you at all. This is not new, it's been federal law since 2019, but it consistently surprises owner-managers who assume the $500,000 threshold is automatic.
5. Confirm Your CCPC Status
The rate applies only to Canadian-Controlled Private Corporations. If a non-resident owns more than 50% of voting shares, or if your corporation is publicly traded, you don't qualify. If ownership changed hands in 2026, verify status with your accountant before year-end.
The Deadline
December 31 closes the books. Income and expenses recognized after that date land in the next taxation year. For most calendar-year CCPCs, that means no further opportunity to shift 2026 income across the July 1 line. The timing choices that matter happen in November.
Read Next
Toronto's Condo Market Revival Runs on Investor Bulk Deals, Not Organic Demand
How a $49 Water Sensor Cut My Home Insurance Premium by 15%
What a 50% US Tariff Actually Costs Canada: Beyond the Headline Number
Canadian Home Sales Climb While Listings Drop 11%: The Supply Shortage Is Getting Worse