Personal Tax Filing in Ontario: Deadlines, Deductions, and Credits Most People Miss
Quick Answer: Most Ontarians must file their T1 personal income tax return by April 30. Self-employed individuals (and their spouses or common-law partners) have until June 15 to file, but any balance owing is still due April 30. Commonly missed tax savings include RRSP and FHSA deductions, medical expenses, charitable donations, childcare costs, eligible employment expenses, and pension income splitting.
Every spring, millions of Canadians file their personal tax returns. Many leave money on the table, not through any mistake, but because they are unaware of deductions and credits they qualify for. This guide explains the deadlines, the difference between deductions and credits, and the tax savings Ontarians most often overlook.
Key T1 Deadlines
- April 30: Filing deadline for most individuals and payment deadline for everyone, including the self-employed.
- June 15: Filing deadline for self-employed individuals and their spouses or common-law partners.
- Early March (60 days after year-end): RRSP contribution deadline for deductions against the previous year’s income.
- Instalment dates (March 15, June 15, September 15, December 15): For individuals required to pay tax in instalments.
If a deadline falls on a weekend or public holiday, the CRA generally treats a return as filed on time if it is received by the next business day.
Why File On Time, Even If You Can’t Pay?
Late-filing penalties for T1 returns are generally 5% of the balance owing plus 1% for each full month late, up to 12 months. Interest also accrues on unpaid balances. Filing on time, even without paying in full, avoids the late-filing penalty.
Filing matters even with little or no income. Your return determines eligibility for benefits and credits such as the Canada Child Benefit, the GST/HST credit, and the Ontario Trillium Benefit. Not filing can mean losing those payments.
Deductions vs. Credits: What’s the Difference?
Deductions reduce your taxable income. Their value depends on your marginal tax rate: the higher your income, the more a deduction saves you.
Non-refundable credits reduce the tax you owe, typically at the lowest tax rate. They can bring tax owing to zero, but they do not create a refund on their own.
Refundable credits can generate a payment even if you owe no tax.
Commonly Missed Deductions
RRSP contributions. Contributions reduce taxable income. You can also carry forward unused deductions to a higher-income year where they may save more tax.
First Home Savings Account (FHSA) contributions. Eligible first-time home buyers can deduct FHSA contributions, and qualifying withdrawals for a home purchase are tax-free.
Childcare expenses. Daycare, nursery school, day camps, and eligible babysitting can often be deducted, usually by the lower-income spouse.
Moving expenses. If you moved at least 40 km closer to a new job, business, or full-time post-secondary program, some moving costs may be deductible.
Employment expenses. Employees required to pay their own expenses, such as a home office, vehicle costs, or supplies, may be able to deduct them if the employer signs Form T2200.
Union and professional dues. Annual dues for professional bodies and unions are generally deductible.
Carrying charges and interest. Interest on money borrowed to earn investment income may be deductible.
Support payments. Certain spousal support payments may be deductible to the payer.
Commonly Missed Credits
Medical expenses. Prescriptions, dental work, glasses, physiotherapy, and many other expenses can qualify, subject to a minimum threshold based on income. Pooling family medical expenses on one return, usually the lower-income spouse’s, often gives the best result. You can also choose any 12-month period ending in the tax year.
Charitable donations. The federal credit rate increases for donations above $200, making it worthwhile to combine donations on one spouse’s return, or carry them forward for up to five years.
Disability tax credit. Individuals with a severe and prolonged impairment, and supporting family members, may qualify. It can also be claimed retroactively in some cases.
Canada caregiver credit. Available if you support a spouse or dependant with a physical or mental impairment.
Tuition credits. Students can carry forward unused tuition credits or transfer a portion to a parent, grandparent, or spouse.
Pension income splitting. Eligible pension income can be split with a spouse or partner, potentially lowering total family tax.
Canada Workers Benefit. A refundable credit for lower-income workers.
Tax Tips for Self-Employed Ontarians
If you are a freelancer, contractor, or sole proprietor, you report business income on Form T2125 with your T1. Important points:
- Track every business expense: home office (business-use portion), vehicle (with a logbook), phone and internet, software, professional fees, advertising, and supplies.
- Remember CPP: self-employed individuals pay both the employee and employer portions of CPP contributions.
- Watch for instalments: once tax owing passes the threshold, the CRA may require quarterly instalments.
- Pay by April 30: the June 15 filing date does not extend the payment date.
- Consider HST: if revenue exceeds $30,000, you likely need to register.
- Evaluate incorporation: once profits exceed your personal spending needs, incorporating may offer tax deferral.
Newcomers to Canada
If you became a Canadian tax resident during the year, you generally report worldwide income from the date you became resident. Newcomers should file even with little income, to establish eligibility for benefits and credits. Foreign property above certain thresholds may need to be reported on Form T1135.
Common T1 Mistakes
- Filing before all slips arrive (T4, T5, T3, RRSP receipts)
- Forgetting income from side jobs, gig work, or platforms
- Not reporting foreign income or foreign property
- Missing the RRSP deadline
- Failing to coordinate claims between spouses
- Ignoring notices from the CRA
How Solstice Partners Helps With Personal Tax
Solstice Partners prepares personal tax returns for employees, families, retirees, newcomers, and self-employed professionals across Toronto and the GTA. We review your full situation to make sure every eligible deduction and credit is claimed and that spouses’ returns are coordinated for the lowest household tax. For self-employed clients, we can also support bookkeeping, HST, and incorporation decisions.
Frequently Asked Questions
When is the personal tax deadline in Ontario?
April 30 for most people. Self-employed individuals and their spouses have until June 15 to file, but payment is still due April 30.
What happens if I file my taxes late?
If you owe tax, the CRA generally charges a penalty of 5% of the balance plus 1% per month late (up to 12 months), plus interest.
Should I file even if I have no income?
Yes. Filing keeps you eligible for benefits and credits such as the GST/HST credit, Canada Child Benefit, and Ontario Trillium Benefit.
Can I claim home office expenses?
Self-employed individuals can claim the business-use portion of home costs. Employees generally need a signed T2200 from their employer and must meet CRA conditions.
Can I go back and claim deductions I missed in past years?
In many cases, yes. You can generally request adjustments to prior-year returns within set time limits.
Do I need to report income from gig or platform work?
Yes. All income must be reported, including freelance, gig, and online platform income.
Want your personal return done right? Contact Solstice Partners to book your tax appointment.
