Affordable Corporate Tax Audit Support for Canadian Businesses

As the rules stand for the 2025 tax year filed in 2026, the late-filing penalty is 5% of the balance owing plus 1% of that balance for each full month the return is late, to a maximum of 12 months, so 17% at worst. It rises to 10% plus 2% per month for up to 20 months, a 50% maximum, but only where the CRA formally demanded the return and had already charged a late-filing penalty for any of the three preceding tax years. Interest compounds daily.

Ontario charges its own graduated personal rates, plus a surtax and the Ontario Health Premium, on top of federal tax, so the combined marginal rate climbs with income. For corporations in 2026 the Ontario small business rate is 3.2%, falling to 2.2% effective 1 July 2026, which gives a combined federal and provincial small business rate of 12.2% falling to 11.2%; a 31 December 2026 year end blends to roughly 11.7%. The Ontario combined general rate for 2026 is 26.5%.

Start with total income from every source for the year, including employment, self-employment, investments and pensions. Subtract the deductions you qualify for, such as RRSP contributions, child care costs, union dues and deductible employment expenses, to reach net income. Take off any further deductions that apply at the next stage, losses carried forward among them, and what remains is taxable income, the figure the brackets are applied to. Credits reduce the tax calculated on that figure rather than the income itself.

Usually because the pay for that period is low enough that the basic personal amount covers it. Payroll annualises each cheque, so part-time or irregular hours can produce zero income tax while CPP and EI still come off. Other causes are a TD1 claiming large credits, a claim of exemption from withholding, or being paid as a contractor rather than an employee, in which case nothing is withheld and the tax is yours to set aside and remit.

Severance is employment income in the year you receive it, taxed at your marginal rate like salary. Your employer withholds tax at source using lump-sum withholding rates, which are often lower than your final rate, so a balance can come due at filing. A retiring allowance can sometimes be transferred directly to an RRSP, sheltering it until withdrawal. Legal fees to collect severance may be deductible. Check the CRA's retiring allowances guidance before signing.

There is no single definition. For tax the test that matters is the small business deduction: a Canadian-controlled private corporation earning active business income claims the lower rate on the first $500,000 of it for 2026, shared across associated corporations. Federally that limit falls by $5 for every $1 of adjusted aggregate investment income above $50,000 and is gone at $150,000, while Ontario keeps the full $500,000. Grant and lending programs use their own headcount or revenue tests.

A business lets you deduct the real costs of earning income, such as supplies, subcontractors, software and a reasonable share of home office, phone and vehicle costs, so you are taxed on profit rather than revenue, and a loss can often offset other income. Incorporating adds the federal small business rate of 9% on the first $500,000 of active business income for 2026, plus control over when you take money out. Personal spending dressed up as a business expense is not deductible.

Online filing for the 2025 tax year opened on 23 February 2026 and stays open until 29 January 2027. You can gather documents and prepare the return earlier, but the CRA will not accept an electronic return before it opens, and employer and investment slips are often not all issued until late February or March. The deadline was 30 April 2026, or 15 June 2026 if you or your spouse were self-employed, with payment still due 30 April.

Tax preparation fees are deductible when they relate to earning income. A self-employed person or a partner deducts the accounting fee on the business statement, Form T2125, and a rental owner deducts it on the rental statement, Form T776. A salaried employee with a straightforward T1 generally cannot claim it. Fees paid to prepare an objection or an appeal of an assessment are also deductible, and fees for investment advice may qualify as carrying charges.

Total income before deductions sits on line 15000 of the T1. It adds together employment income, self-employment, pensions, investment income and other sources. Net income on line 23600 comes after deductions such as RRSP contributions and union dues, and taxable income on line 26000 is lower again. A lender asking for gross income usually wants line 15000, while benefit and credit tests are almost always run on net income.

Yes, in part. The rate applied to the lowest federal bracket was cut part-way through 2025, so the 2025 return uses a blended rate for that bracket and the full reduction applies from 2026 onward. Bracket thresholds and most credit amounts were also indexed. Separately, the proposed increase to the capital gains inclusion rate was never enacted, so one-half remains the inclusion rate for the 2025 and 2026 tax years. CRA's federal tax rates page gives the exact percentages per year.

Spousal support is normally taxable to the recipient and deductible to the payer, provided the payments are periodic and required by a court order or written agreement. Child support under most current orders is neither taxable nor deductible. Lump-sum settlements, and payments made before any order or agreement exists, usually fail the test. Register the order or agreement with the CRA and keep it available, because support claims are frequently reviewed before a refund is released.