How to File Corporate Taxes in Canada: 2026 Step-by-Step T2 Guide

If you own an incorporated business, your corporation files its own tax return every year, separate from your personal return. Knowing how to file corporate taxes in Canada comes down to a few things: reconciled year-end financial statements, a T2 return prepared in CRA-certified software, the right schedules, and two deadlines that are easy to mix up.

This guide walks through the T2 process for a small Ontario corporation in plain language: who has to file, what you need, each step from closing the books to paying the balance, instalments, the 2026 Ontario rate cut, penalties and common mistakes. It applies to tax years ending in 2026, with returns filed in 2027.

Table of Contents

1. Who has to file a T2 return
2. T2 filing and payment deadlines
3. What you need before you start
4. How to file corporate taxes in Canada, step by step
5. Instalments and the 2026 Ontario rate cut
6. Late filing penalties and interest
7. Common mistakes and when to get help
8. How BBA Tax helps with corporate tax filing
9. Frequently Asked Questions

Who has to file a T2 return

Every corporation resident in Canada must file a T2 for every tax year, even if it has no tax payable. The CRA’s page on who has to file a T2 return says this includes non-profit organizations, tax-exempt corporations and inactive corporations. The only exceptions are tax-exempt Crown corporations, Hutterite colonies, and corporations that were registered charities throughout the year.

So a corporation you incorporated but never used, a business that stopped operating but was never dissolved, a company with a loss, and a holding company that only holds investments all still file. The corporation exists for tax purposes until it is formally dissolved.

There is one break for inactive corporations. If the corporation was inactive all year and has no balance sheet or income statement information to report, it no longer has to attach the financial statement schedules (100, 125 and 141). The T2 itself is still required.

T2 filing and payment deadlines

The T2 is due six months after year-end, but the tax is due sooner: two months after year-end, or three months for qualifying small CCPCs. Under the CRA’s filing deadline rules, a year ending on the last day of a month is due on the last day of the sixth month after; a year ending on any other day is due on the same day of the sixth month after.

The balance-due day is three months after year-end only if the corporation was a CCPC throughout the year, claimed the small business deduction in the current or previous year, and its previous-year taxable income (combined with any associated corporations) did not exceed its business limit. Everyone else pays at two months.

The costliest mistake is treating the six-month filing date as the payment date. Interest starts after the balance-due day, even if the return is filed on time. Ontario corporations also file a separate annual return through the Ontario Business Registry; it is not part of the T2.

What you need before you start

You need year-end financial statements that reconcile to your bank accounts, plus the records behind them:

• a balance sheet and income statement for the year;
• reconciled bank, credit card and loan statements for every corporate account;
• a list of assets bought or sold, for capital cost allowance;
• payroll records, T4 and T4A slips, and dividends paid to shareholders;
• GST/HST returns for the year and the corporation’s share register; and
• last year’s T2 and notice of assessment, for losses, CCA balances and other carryovers.

GIFI: your financial statements in CRA format

Financial statements go to the CRA in a coded format called the General Index of Financial Information (GIFI). Schedule 100 holds the balance sheet, Schedule 125 the income statement, and Schedule 141 asks who prepared the statements; it must be completed even if there are no notes. Tax software builds these from your trial balance, but the mapping still needs a review.

Schedules most small corporations need

Which schedules you need depends on your facts; the CRA’s T2 Corporation Income Tax Guide covers them all. These come up most for small Ontario corporations:

Ontario’s old CT23 return is gone. Since tax years ending after 2008, Ontario corporate tax is filed on one harmonized T2 with the CRA. Ontario tax is worked out on Schedule 500, a worksheet you keep rather than file, and carried to Schedule 5.

How to file corporate taxes in Canada, step by step

Filing a T2 is a sequence: close the books, prepare statements, convert them to a tax return, file electronically and pay.

1. Confirm your tax year-end. It is generally the corporation’s fiscal period; check it against your last notice of assessment.
2. Close the books. Record every transaction, reconcile every account and clear out unexplained entries. Good bookkeeping during the year makes this step short.
3. Prepare the financial statements, including year-end adjustments such as accruals, prepaid expenses and shareholder loan balances.
4. Enter the return in CRA-certified software and map the statements to GIFI.
5. Adjust to taxable income on Schedule 1. For example, add back 50% of most meals and entertainment and your accounting depreciation, then deduct CCA from Schedule 8. See what expenses a corporation can write off.
6. Complete the other schedules: shareholders, associated corporations, the small business deduction and Ontario tax.
7. Review. Compare revenue to your GST/HST returns, wages to your T4 summary and dividends to your T5 slips.
8. File electronically. If an accountant files for you, the corporation signs Form T183CORP, which is kept on file rather than sent to the CRA.
9. Pay by the balance-due day and keep your records in case the CRA reviews the return.

Mandatory electronic filing

For tax years starting after 2023, all corporations have to file the T2 electronically, except insurance corporations, non-resident corporations, corporations reporting in a functional currency, and corporations exempt from tax under section 149 of the Income Tax Act. A corporation that must e-file and does not is charged $1,000. Mailing a printed bar-code T2 counts as paper filing.

Instalments and the 2026 Ontario rate cut

Many corporations must pay tax in instalments during the year. Under the CRA’s instalment rules, none are needed if tax payable is $3,000 or less for either the current or previous year, and generally none for the first tax year after incorporation.

Instalments are monthly by default. A CCPC can pay quarterly if it has a perfect compliance history over the past 12 months and, with associated corporations, had taxable income of $500,000 or less and taxable capital of $10 million or less in the current or previous year. Our post on CRA tax instalments in 2026 explains the calculations.

Ontario small business rate: 2.2% from July 1, 2026

Effective July 1, 2026, the Ontario lower rate of corporate income tax fell from 3.2% to 2.2% on the first $500,000 of a CCPC’s active business income. With the 9% federal rate, the combined small business rate is now 11.2%, down from 12.2%. The general rate stays at 26.5%, per the CRA’s corporation tax rates page.

The 2026 Ontario Budget said the cut is prorated for tax years that straddle July 1, 2026, so a December 31, 2026 year-end gets a blended rate for 2026 and the full 2.2% from 2027. Our corporate tax rates guide lists federal and Ontario rates side by side.

Late filing penalties and interest

Filing late costs 5% of the tax unpaid on the filing deadline, plus 1% of it for each complete month late, up to 12 months. The CRA’s avoiding penalties page also sets out:

• Repeat late filers: 10% plus 2% per complete month, up to 20 months, if the CRA demanded the return and charged a late-filing penalty in any of the three previous years.
• Not e-filing when required: $1,000.
• Interest on overdue tax: from the balance-due day, at 7% for October to December 2026.
• Instalment interest, plus an extra penalty when instalment interest for the year exceeds $1,000.

Because the penalty is based on unpaid tax, a corporation with nothing owing may not see one right away. That is no reason to skip a year: the CRA can demand the return, and refunds are lost after three years. If you are behind, our unfiled taxes and catch-up filing service can bring the corporation up to date. The CRA can waive penalties and interest for circumstances beyond your control, but relief is not automatic.

Common mistakes and when to get help

Most T2 problems start with the books and the deadlines, not the return itself:

• Skipping the return for an inactive company. It files every year until it is dissolved.
• Paying at six months instead of two or three.
• Running personal expenses through the corporation. They are not deductible and can become taxable shareholder benefits or loans.
• Forgetting the owner’s slips: T5s for dividends, a T4 and remittances for salary.
• Ignoring associated corporations, which share one $500,000 small business limit.
• Revenue that does not match your GST/HST returns.

A simple corporation with clean books can file with certified software. Get help for a first T2, a holding company or associated corporations, investment income or asset sales, a salary versus dividend decision, a year or more of unfiled returns, or a letter from the CRA.

How BBA Tax helps with corporate tax filing

BBA Tax is an Ottawa accounting firm led by Karim Bitar, Lead Accountant and ELITE Certified QuickBooks ProAdvisor. We prepare and e-file T2 corporate income tax returns for incorporated small businesses, contractors and professionals in Ottawa and remotely across Canada, including GIFI statements, Schedule 1 adjustments, CCA, shareholder schedules and Ontario tax. We can also handle the bookkeeping, instalments, T4 and T5 slips, GST/HST returns and CRA correspondence around them.

Frequently Asked Questions

Does an inactive corporation have to file a T2 return?

Yes. Every corporation resident in Canada files a T2 for every tax year, even with no income or tax payable, until it is formally dissolved. If it was inactive all year and has no balance sheet or income statement information, it can leave off GIFI schedules 100, 125 and 141, but the return is still required.

When is my corporate tax return due?

Six months after the end of the corporation’s tax year, so June 30 of the next year for a December 31 year-end. Any tax owing is due earlier: two months after year-end for most corporations, or three months for a CCPC that meets the small business conditions.

Can I file my corporate taxes myself?

Yes, if you use CRA-certified tax software and file electronically, since most corporations can no longer file on paper. It works best for a simple corporation with reconciled books. You still need proper GIFI statements, Schedule 1 adjustments and the right schedules, which is why many owners use an accountant.

Do I still need to file Ontario’s CT23?

No. For tax years ending after 2008, Ontario corporate tax is reported on the federal T2 filed with the CRA. Ontario tax is calculated on Schedule 500, a worksheet you keep, and reported on Schedule 5. The Ontario annual return is filed separately through the Ontario Business Registry.

Does my corporation have to pay instalments?

Only if its tax payable is more than $3,000 in both the current and previous tax years. Corporations generally skip instalments in their first tax year after incorporation. Payments are monthly, or quarterly for small CCPCs with a perfect compliance history that meet the taxable income and taxable capital limits.