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Tax preparation services do one thing you can’t easily do yourself: they file your return with the CRA on your behalf, using certified software, and they stand behind the numbers. Whether that’s worth paying for depends on how tangled your year was. We couldn’t confirm what any service charges, so this page is about how to pick one and how to check its work.
What does a tax preparation service actually do?
A preparer collects your slips and receipts, enters them into software, and sends the return over the EFILE system. The CRA says a preparer can be a firm, an organization, a discounter or another certified individual. What they all share is a listing in the CRA’s tax preparer directory, which is limited to people certified for EFILE.
That directory is the first place to look. A name that isn’t on it deserves a second question.
How to choose tax preparation services
Start with what your year looked like. A T4 job and a bank interest slip is a light return. Rental income, self-employment, a sale of shares or a move between provinces is a heavier one, and you want someone who deals with those often.
Then ask four things before you hand over anything.
- Are you certified for EFILE, and can I see it in the CRA directory?
- What will it cost for my kind of return, in writing, before you start?
- Who do I call in June if the CRA writes to me?
- How will you get access to my CRA account, if at all?
The last one changed recently. From 15 July 2025, the CRA says preparers can no longer request authorization for an individual client through EFILE, so ask how they’ll handle it.
What happens between your slips and your refund
| Step | What to expect | What you keep |
|---|---|---|
| Hand over information | Slips, receipts, and your updated address and bank details | Copies of everything |
| Review the return | You read the numbers before it’s sent | Your copy of the return |
| Sign Form T183, Part F | This authorizes the preparer to send it electronically | The completed T183 |
| Notice of assessment | The CRA says the notice and any refund usually take about 2 weeks | The notice, for at least 6 years with the slips |
Can you check the return before you sign it?
Yes, and you should. The CRA says the information on the T183 has to match your electronic return, and signing it is your sign-off, not the preparer’s.
You don’t need to redo the whole thing. Run a rough number first. Take a single person in Ontario earning $60,000 from one job, with $9,000 of income tax withheld on the T4. The tax refund calculator gives income tax of $8,320.50 and a refund of $679.50 before credits it doesn’t include.
If a preparer’s total is far from that, it doesn’t mean they’re wrong. Tuition, medical costs or a donation can explain a gap. But it’s a fair question to ask, and a good preparer can answer it in one sentence.
For what leaves your pay each period, the take-home pay calculator works from the same tax data. The income tax calculator splits the bill between federal and provincial tax.
Mistakes that turn a paid service into a headache
Choosing on price alone is the common one. A low quote for a return that later needs fixing isn’t cheap.
Another is signing a blank or partial form. Don’t. A third is leaving the deadline to the preparer, when you’re the one who owes the penalty. For the 2025 return the CRA’s dates were 30 April 2026 for most people and 15 June 2026 for the self-employed, with any balance still due on 30 April. We couldn’t find the 2026 return dates yet, so check the CRA page before you rely on them.
What does a slip cost? On $1,000 owing, filing three full months late means a penalty of 5% plus 3%, so $80, before interest. The rates come from the CRA, and the $80 is our arithmetic.
One more thing to be careful about. A preparer who promises a bigger refund than the numbers support, or who wants a share of it, is telling you something about the business. We haven’t verified any firm’s practices, so judge the answers you get.
Where the numbers come from
The preparer process, the T183 rules, the authorization change, the dates and the late-filing penalty come from Canada Revenue Agency pages, read in September 2026. The refund example comes from our calculators, which use 2026 federal and Ontario tax data. We aren’t linked to the CRA or any government body.
Frequently asked questions
Where can I confirm a preparer can file my return?
The CRA has a tax preparer directory of people certified for EFILE. If a name is missing from it, ask why.
What is Form T183?
It's the form you sign, in Part F, to authorize your preparer to send your return to the CRA electronically. It must match the return that is filed.
How long do I keep my records?
The CRA says to keep your slips, receipts and the completed T183 for at least 6 years.
Do I have to use a preparer?
No. You can file yourself with certified software, or use a free volunteer clinic if your return is simple and your income modest.
What does a preparer cost?
We couldn't confirm typical fees, and they vary. Ask for the price in writing before any work starts.
- 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
Information only. This page is general information, not tax, legal or accounting advice. Tax-Services.ca is an independent publisher: we don't prepare or file tax returns or offer tax services, and we have no connection with the CRA, Revenu Québec, any government or any company named on this page. Check the figures that matter with an official source or a qualified professional.