CRA Prescribed Interest Rates Q4 2026: What You Owe

Disclaimer: This article is for informational purposes only and does not constitute tax or financial advice. Consult a qualified accounting professional before making any tax or financial decisions.

Quick Answer

Why Interest Rates Matter More Than Most Taxpayers Realize

A quarterly rate change from the Canada Revenue Agency sounds like a technicality. For anyone carrying a balance owing, it is anything but.

The 7% rate CRA charges on overdue personal income tax for Q4 2026 is not tax-deductible. For an Ontario taxpayer in a 50% marginal bracket, that effectively doubles the real cost, pushing a $10,000 balance left unpaid for 90 days closer to a 10% to 14% pre-tax loan than to a bank line of credit.

The good news is that these rates are predictable, reset every three months, and come with several legitimate levers to reduce the damage. If you have unfiled returns, a balance owing, or a reassessment pending, our accounting and tax services can help quantify the exposure and move it in the right direction.

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The Four Rates Explained in Plain English

Overdue tax, CPP, and EI: 7%

The 7% rate applies to unpaid personal and corporate income tax, Canada Pension Plan contributions, Employment Insurance premiums, GST and HST balances, and missed or short-paid instalments. Interest compounds daily and accrues from the balance-due date, not the date CRA assessed the amount.

Non-corporate overpayments: 5%

When CRA holds money that belongs to you, whether a delayed refund or an excess payment, it typically pays 5% interest to individuals, trusts, and partnerships for Q4 2026. The clock usually starts 30 days after the filing deadline or the date you overpaid, whichever is later.

Corporate overpayments: 3%

Corporations receive 3% on overpayments for Q4 2026. The spread between what CRA charges corporations (7%) and what it pays them (3%) is one reason tax-planning advice generally favours paying corporate balances close to the due date rather than well in advance. See how Canadian corporate tax rates work for broader context.

Taxable-benefit and prescribed-rate loans: 3%

The lowest of the four, 3%, is used to calculate the deemed interest benefit when a corporation lends money to a shareholder or employee, and as the floor rate for prescribed-rate loans between spouses or into a family trust for income-splitting purposes.

Overdue Tax vs. Overpayment Interest: Who Owes Whom

The headline figures reveal an asymmetry worth noticing. CRA charges 7% on balances owing but pays less in return: for individuals the gap is two percentage points, for corporations it is four.

This matters most in two situations: a disputed reassessment where you may have overpaid while CRA takes months to review, and a corporate overpayment held while you wait for a notice of assessment. In both cases the real cost of CRA’s processing time is quietly borne by the taxpayer, which is why we often recommend reviewing why CRA tax refunds are sometimes delayed and acting early.

Practical takeaway: if you expect a refund, file as early as the system allows. If you expect to owe, pay what you can before the balance-due date rather than banking on a next-quarter rate drop.

Shareholder and Employee Loans: The 3% Rate as a Planning Lever

The 3% prescribed rate shows up in two very different conversations. Both involve loans, and both are governed by sections of the Income Tax Act most owner-managers have never read.

Loans from a corporation to a shareholder or employee

If your corporation lends you money, section 80.4 of the Income Tax Act treats the gap between the prescribed rate and the rate you actually pay as a taxable benefit. For Q4 2026, a 0% corporate loan is treated as if it carried 3% interest, and that notional amount is added to your taxable income. Section 15(2) can also treat the full principal as taxable income if the loan is not repaid within one year of the corporation’s year-end. Repayment timing is the single most common place owner-managers get caught.

Prescribed-rate loans between spouses

The same 3% rate sets the floor for a well-known income-splitting strategy: a loan from a higher-income spouse to a lower-income spouse, who invests the funds and reports the income. If the loan carries interest at the prescribed rate in effect when it is made, and the interest is actually paid by January 30 of the following year, the attribution rules in subsection 74.5(2) do not apply. A 3% loan locked in during Q4 2026 keeps that rate for its life under current rules, which can make now a reasonable planning window.

Step-by-Step: How to Stop CRA Interest From Accruing

The following six steps apply to most individual and small-business taxpayers carrying a balance into Q4 2026:

1. 1
   Confirm the balance onlineLog into CRA My Account or My Business Account and confirm the exact balance owing. The online figure is current to the day and more accurate than a letter you received last month.
2. 2
   Pay what you can todayPartial payments reduce the principal interest compounds against, so a small payment now typically saves more than a larger payment in two weeks.
3. 3
   Set up a payment arrangementCRA accepts arrangements through My Account, by phone, or through a representative. An arrangement does not stop interest, but it can prevent further collection action.
4. 4
   File every outstanding returnFile on time even if you cannot pay. The late-filing penalty (5% of the balance plus 1% per month) sits on top of the 7% interest.
5. 5
   Apply for taxpayer relief if you qualifyForm RC4288 lets you request cancellation of interest and penalties on recognised grounds, typically extraordinary circumstances, CRA-caused delays, or financial hardship.
6. 6
   Keep next quarter’s instalments currentOur guide to CRA tax instalment dates for 2026 walks through the full-year schedule.

Instalment Interest: The Trap That Catches Self-Employed Ontarians

Self-employed Canadians, incorporated professionals, and anyone whose net tax owing exceeded $3,000 ($1,800 in Quebec) in either of the two preceding years are generally required to pay income tax by quarterly instalments. The Q4 2026 personal instalment is due December 15, 2026.

Instalment interest is calculated at the same 7% rate as overdue tax and compounds daily. If instalment interest for the year exceeds $1,000, section 163.1 of the Income Tax Act may add a further penalty equal to 50% of the interest above that threshold. Our breakdown of the September 15 personal tax instalment explains how the quarterly cycle works in practice.

Common Mistakes Taxpayers Make With CRA Interest

Across Ontario files we see each quarter, the same handful of missteps account for most of the avoidable interest Canadians pay.

• →Treating CRA interest like a bank loan. Interest compounds daily and, for individuals, is not deductible, so the 7% rate behaves closer to 10% to 14% pre-tax.
• →Filing late because you cannot pay. The late-filing penalty of 5% plus 1% per month stacks on top of the 7% interest, so filing on time is the cheapest thing you can do today.
• →Ignoring instalment reminders because you expect a refund this year. Reminders are based on prior-year tax owing, which may still apply even in a lower-income year.
• →Assuming CRA will waive interest if you ask informally. Relief is granted only through the Taxpayer Relief Provisions under subsection 220(3.1). If you believe your assessment is wrong, consider filing a Notice of Objection with CRA.
• →Owner-managers forgetting a shareholder loan is on the clock. Repay within one year of the corporation’s year-end, or face a section 15(2) income inclusion plus imputed interest under section 80.4.
• →Running a spousal prescribed-rate loan with no written agreement or no actual interest paid. Document the loan and pay the interest by January 30 of the following year, or the attribution rules claw the strategy back.
• →Waiting for the next quarter’s rate before paying. Interest accrues every day. A lower rate in Q1 2027 does not undo what accrued in Q4 2026.

Frequently Asked Questions

Disclaimer: This article is for informational purposes only and does not constitute tax or financial advice. Consult a qualified accounting professional before making any tax or financial decisions.

Sources & References

• Canada Revenue Agency. “Prescribed interest rates.” canada.ca/en/revenue-agency/services/tax/prescribed-interest-rates.html
• Government of Canada. Income Tax Act — sections 161, 163.1, 15(2), 80.4, 74.5(2), 220(3.1), and paragraph 18(1)(t). laws-lois.justice.gc.ca/eng/acts/i-3.3/
• Government of Canada. Income Tax Regulations, Regulation 4301 (quarterly rate formula). laws-lois.justice.gc.ca/eng/regulations/C.R.C.,_c._945/
• Canada Revenue Agency. “Pay the CRA.” canada.ca/en/revenue-agency/services/tax/taxpayers/pay-cra.html
• Canada Revenue Agency. “Form RC4288, Request for Taxpayer Relief.” canada.ca/en/revenue-agency/services/forms-publications/forms/rc4288.html
• Canada Revenue Agency. “Required tax instalments for individuals.” canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/paying-your-income-tax-balance-owing/required-tax-instalments.html
• Canada Revenue Agency. “Taxpayer Relief Provisions (Information Circular IC07-1R1).” canada.ca/en/revenue-agency/services/forms-publications/publications/ic07-1r1.html