See the sourced 2026 Ontario tax guide: rates, limits and deadlines →
What to take away
- The 2026 tax year and the 2026 filing season describe different periods.
- A later filing deadline does not necessarily give you more time to pay.
- Use reconciled records and your own account limits before acting.
Start with the right year
Income earned during the 2026 calendar year generally belongs on the personal return filed in 2027. A corporation may use a different fiscal year. Write that period at the top of your working papers so that receipts, estimates and notices stay attached to the right return.
Collect the previous notice of assessment, correspondence and a list of changes in your circumstances. Note a move, a new business, a property transaction or a change in family situation. The point is to give your accountant a complete starting picture, rather than assume last year’s return still describes you.
Reconcile the business before estimating tax
Bring bank and credit-card reconciliations up to date. Review unpaid customer invoices, supplier bills, equipment purchases and transactions with the owner. Keep a list of unresolved items with the supporting documents, rather than quietly changing entries to make an account balance.
Separate business and personal spending. A bank payment alone does not establish deductibility, and equipment may require a different treatment from an ordinary expense. Keep invoices, business-purpose notes and mileage or home-office records where relevant. Ask which missing facts affect the estimate before deciding how much cash is available.
Check the remaining instalment and contribution dates
December 15, 2026 is the fourth ordinary quarterly instalment date for individuals required to pay by instalments. Check your reminder and the calculation option that fits your circumstances. A changed income estimate does not automatically make an outstanding instalment disappear. Farming and fishing have separate timing rules.
FHSA contributions use the calendar year. If you intend to claim a qualifying contribution for 2026, the contribution must be made by December 31, 2026. Allow time for the institution to process it and confirm your actual participation room before transferring money.
Discuss Ontario’s corporate rate change
CRA’s current corporation-rate table records Ontario’s lower rate changing from 3.2% to 2.2% on July 1, 2026. A year spanning that date requires a calculation based on the days each rate applies. The lower rate is subject to eligibility and business-limit rules; it is not a rate for every dollar a corporation earns.
Bring the corporation’s year-end date and information about associated companies to the discussion. The Sora incorporation estimator uses a full January-to-December 2026 example. A short year or another fiscal period needs its own calculation, and personal tax on money withdrawn is a separate question.
Set aside money against a dated forecast
Make a list of the tax and remittance balances that the business already owes. Compare expected collections with supplier, payroll and financing commitments. Money in a bank account may already be needed for obligations that are not obvious from the current profit figure.
Update the estimate when missing records are resolved. Keep the assumptions alongside the forecast so a delayed customer payment or revised expense is visible. A reserve based only on a rough percentage of bank deposits can miss both the timing and the type of tax involved.
Prepare for filing without confusing payment dates
Most self-employed individuals have a June 15, 2027 filing date for their 2026 personal return, while the balance is due April 30, 2027. Special exceptions apply. A corporation’s return and payment dates instead follow its own year-end and circumstances.
Use Sora’s 2026 tax guide for the sourced date and rate tables, then gather the relevant checklist and arrange a secure way to share records. A year-end conversation is most useful when it ends with a list of missing information, responsible people and the next date for reviewing the numbers.
Sources & editorial notes
Sources checked October 24, 2026. The examples are illustrative and provide general information. Discuss how the guidance applies to your circumstances with your accountant.
- Business recordsCanada Revenue Agency
- Business expensesCanada Revenue Agency
- 2026 individual instalment due datesCanada Revenue Agency
- Tax deductions for FHSA contributionsCanada Revenue Agency
- Corporation tax rates and Ontario’s July 1, 2026 reductionCanada Revenue Agency
- 2027 tax deadlines for businesses and self-employed individualsCanada Revenue Agency
Rules and guidance can change. Use the current official source and confirm the treatment for your facts. To flag an error, contact Sora.