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An income tax accountant is worth paying when your return has more in it than a T4. On $85,000 of employment income in Ontario the total federal and provincial tax for 2026 comes to $15,551, and a plain T4 return like that is something you can do yourself in software. Add self-employment, rental income or foreign money and the calculation changes.
When is an income tax accountant worth the fee?
Here’s the honest test. If everything you earned arrived on slips and you claim the usual credits, you probably don’t need one. If you had business income, a rental, a sale of property or a move between countries, an hour with a professional can pay for itself.
We can’t tell you what accountants charge. We found no official source for fees, so we don’t quote any. What we can do is show you how much is at stake, which is the number to weigh the fee against.
What does a personal return cost you in tax?
These figures come from the income tax calculator for an Ontario resident with all income from a job, 2026 rules.
| Case | Income tax | CPP and EI | Average tax rate |
|---|---|---|---|
| $85,000 employment income | $15,551 | $5,770 | 18.3% |
| Same, with a $5,000 deduction | $14,069 | $5,770 | 16.6% |
The $5,000 deduction saves about $1,482. That’s the sort of claim a good preparer finds and a rushed one misses. It’s also a claim you can find yourself if you keep your slips. Where an accountant earns the fee is judging which deductions are allowed and how they fit together.
What if you work for yourself?
This is where most people should look at professional help. Self-employed people get a later filing date, June 15, 2026, but any balance owing is still due April 30. Instalments are due on March 15, June 15, September 15 and December 15, and the tax instalments calculator shows a rough schedule.
Take $80,000 of net business income in Ontario. The self-employed tax calculator gives $13,234 of income tax and $8,893 of CPP, both halves, for $22,126 in all. That’s 27.7% of the income taken before you buy groceries. We should flag two gaps in that tool: it leaves out EI and business expenses beyond the net figure you type in, so treat the result as a floor rather than a final number.
Can you do it yourself, or should you pay someone?
Two quick pictures. Priya in Hamilton has one T4, a tuition slip and a small RRSP deduction. She files in software on a Sunday afternoon at tax time and it takes an hour. Her cousin Tomás drives for a delivery app, rents out his basement and sold some shares. He has four types of income and a few tricky questions, and a one-time visit to a preparer is an easy sell.
The dividing line isn’t how much you earn. It’s how many unusual things happened. More boxes that don’t match a slip means more room for a costly slip-up.
What should you ask before hiring an income tax accountant?
- Are you a CPA, and which provincial body lists you? (Check the register yourself.)
- How many returns like mine do you file each year?
- What is the fee for my return, and what would push it up?
- Who prepares it, and who signs off?
- Will you explain what you claimed and why, in plain language?
Watch for anyone who promises a refund before seeing your paperwork. The number comes from your documents, not from the firm.
The CRA keeps a directory of preparers certified to file by EFILE, and its page on using a professional tax preparer explains the steps. Before the return goes in, you review it and sign to authorize the filing, so don’t skip that read-through just because someone else typed the numbers.
Where do people trip up on a personal return?
They forget a slip, especially investment or self-employment income. They claim the wrong spouse for credits, or miss the same credit in the second year because nobody carried it forward. They also treat the refund as the goal. A big refund often means you overpaid all year, which is a loan to the government at no interest.
The tax credits calculator covers federal credits only, so provincial amounts won’t show up in it. Bring the estimate to your appointment as a starting point and ask the preparer to check the provincial side. If you’d like to see a refund or balance before filing, try the tax refund calculator.
How we checked the figures
Filing and instalment dates come from the Canada Revenue Agency‘s 2026 tax deadlines page, read in September 2026. Tax figures come from this site’s calculators, which use 2026 federal and Ontario rates from the CRA and the province. We aren’t a government service and we don’t speak for one.
Frequently asked questions
Do I need an accountant for a T4 return?
Usually not. If all your income is on slips and you claim standard credits, tax software is enough.
When is the 2026 self-employed filing deadline?
June 15, 2026, but any tax you owe is still due April 30, 2026.
What do income tax accountants charge?
We couldn't confirm a typical fee. Ask for a written quote that says what is included.
How do I check an accountant's credentials?
Search the public register of your provincial CPA body rather than trusting a letter in an ad.
Can an accountant promise me a refund?
No sensible one can before seeing your documents. The result depends on your slips, deductions and credits.
- How to choose a tax preparer in Canada
How to decide if you need a tax preparer, what a preparer does, the questions to ask before you hire one and where to find free help in Canada