Tax Accountant Ontario

Ontario Is Canada’s Most Populous Province — and Its Tax Situations Reflect That

Ontario is home to more than 14 million people, Canada’s largest city, its seat of federal government, and some of the country’s most economically diverse communities. From Toronto’s Bay Street finance professionals and Mississauga’s incorporated small business owners to Ottawa’s government workers, Hamilton’s tradespeople, and London’s healthcare practitioners — the range of personal and business tax situations across Ontario is enormous.

Your Modern Accountant serves clients across the entire province. We’re a fully remote accounting practice, which means your location within Ontario — whether you’re in the GTA, eastern Ontario, the north, or anywhere in between — doesn’t affect how efficiently we work together. One accountant. One process. Your taxes filed correctly.

Tax and Accounting Services for Ontario Individuals and Businesses

 We offer a full range of personal and business tax services to Ontario clients:

• Personal income tax (T1) returns — employment income, T4 slips, investment income, RRSP/TFSA, rental property income, capital gains, foreign assets
• Self-employed and sole proprietor tax — HST registration and remittance, business expense deductions, home office claims, annual T1 preparation
• Rental property income — single units, multi-property portfolios, co-ownership arrangements, capital gains on property sales
• Corporate T2 returns — Ontario incorporated businesses, year-end filings, T4 slip preparation, HST filing, shareholder loan management
• CRA correspondence and audit support — review letters, reassessments, audit representation, notices of objection
• Tax planning — salary vs. dividend analysis, corporate structure review, capital gains planning, RRSP strategy

Ontario Tax: What Makes This Province Different

Ontario operates under the Harmonized Sales Tax (HST) system at a combined rate of 13% (5% federal GST + 8% provincial). This is relevant for every self-employed professional and incorporated business in the province. If your revenue exceeds $30,000 annually, you are required to register for HST with the CRA, collect it from clients, and remit it on a quarterly or annual schedule. Input Tax Credits (ITCs) allow you to recover HST paid on business expenses — but only if your records are properly maintained and your HST returns are filed correctly.

Ontario also has its own provincial income tax rates that stack on top of federal rates, making combined marginal tax rates among the highest in Canada for high-income earners. This is precisely why proactive tax planning — not just annual filing — makes a meaningful financial difference for Ontario residents and business owners. Your Modern Accountant builds this into our higher-tier packages so your accountant is helping you plan, not just file.

Serving Tax Clients Across Ontario — City by City

Our Ontario clients come from every corner of the province. Here’s how the tax landscape differs across the regions we serve:

• Toronto and the GTA (Mississauga, Brampton, Markham, Vaughan, Oakville) — the highest concentration of incorporated businesses, real estate investors, tech and finance professionals, and self-employed contractors in the country. HST compliance, corporate T2 filings, rental income, and capital gains are the most common needs.
• Ottawa and eastern Ontario (Kingston, Belleville, Cornwall) — government employees with RRSP complexity, real estate investors, and a growing freelance and tech community. Federal public sector workers often have pension adjustments (PAs) and defined benefit considerations that affect RRSP room.
• Hamilton, Burlington, and Niagara — manufacturing sector workers, incorporated trades professionals, and small business owners. GST/HST compliance and corporate year-end filings are common. Niagara’s hospitality and tourism industry creates a distinct self-employment and seasonal income profile.
• London, Kitchener-Waterloo, and southwestern Ontario — healthcare practitioners, incorporated professionals, university-town freelancers, and tech startup founders. Professional corporations, salary vs. dividend decisions, and T2 filings are core needs in this region.
• Northern Ontario (Sudbury, Thunder Bay, Sault Ste. Marie) — resource sector workers, remote area allowances, northern residents deductions, and small incorporated businesses serving isolated communities. These are situations that require a tax accountant who knows the applicable federal and provincial rules.

Why Ontario Clients Choose YMA Over a Local Accountant

The traditional accounting firm model involves booking appointments weeks out and driving to an office. That doesn’t fit how most Ontario professionals want to operate in 2026. Your Modern Accountant is built differently.

Our process is entirely online. You use our Tax Package Finder to identify the right service tier for your situation. You book a free consultation by phone or video call. You upload your documents through our secure client portal. We prepare your return, review it with you, and file electronically with CRA. If you need year-round access for a CRA letter in August or an RRSP question in January, that is available through our higher-tier packages.

What Our Clients Say

“Love the team at Your Modern Accountant! They are fast, efficient and reasonably priced. Through their online portal, it’s easy to dump all of your info onto them, and they come back with your taxes ready to file. They have great customer service and I would highly recommend them!“ — Casey Hilton

“Worked with Patrick. He responded to all my inquiries very quickly. The online portal was convenient and easy to access. I found the overall experience quite efficient and straight forward. Highly recommend.“ — Nema McGlynn

“I had a complicated tax situation but Patrick at YMA was there to work through it with me, showing great patience, knowledge and efficiency. Thanks for a great job well done.“ — Quisca Producciones