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To file your return online you need tax software certified for NETFILE, and for most people the deadline is April 30. Past that, the right program depends on how simple your return is, what you want to spend and how much hand-holding you like.
What does certified tax software mean?
The Canada Revenue Agency only accepts an online return from products it has tested and approved. That approval is the certification. A certified program fills in the forms, does the maths and sends the return through NETFILE, the agency’s electronic filing service. Some of these products are free and some aren’t, but they all passed the same tests. The CRA publishes the list of certified products each tax year, sorted by cost, in its NETFILE overview.
Certification tells you the return will reach the CRA in the right format. It says nothing about whether the return is right. The program only knows what you type in or import, so a missed slip or a wrong amount goes straight onto your return.
How does e-filing work?
You enter your slips and claims, the program builds the return, and you send it. Afterwards you can follow the status in your CRA account. Keep your receipts, because the agency can ask to see them later. Most programs also copy over last year’s details, which saves a lot of typing when your life hasn’t changed much.
Dates matter more than the tool. For 2025 returns, the file and pay deadline is April 30, 2026 for most individuals. If you or your spouse ran a business, the filing date moves to June 15, but any tax you owe is still due on April 30. Missed it? Don’t panic: the CRA says NETFILE stays open for 2025 returns until January 29, 2027, so you can still file late online. Interest and a late-filing penalty may apply if you owed money, though, so sooner is cheaper.
What should you ask before picking a product?
Run any candidate through this list.
| Question | Why it matters |
|---|---|
| Is it certified for NETFILE? | Without it you cannot file online |
| What does it cost for my return? | Price often depends on the forms you need |
| Can it import my slips? | Fewer typed numbers means fewer errors |
| Does it cover self-employment? | Business income adds forms and expenses |
| What support is included? | Some offer chat or phone, some only articles |
| Can I file for my spouse or family? | Linked returns can affect credits |
Read the price for your own situation before you start, not the one on the front page. If a product only asks for money at the last step, check what the fee covers. TurboTax and other well known names sit next to plenty of smaller ones, and the same questions sort them all. Skip the brand loyalty: if last year’s program wanted $40 to file a return with two slips, a free one may do the same job this year.
Is your return simple or complex?
One or two slips, no business income and standard credits: that’s the easy case. Most programs handle it without a fuss, and a free option is often enough. Things get harder with rental income, capital gains, foreign income, a move between provinces or a death in the family, because the program is then more likely to ask something you can’t answer.
Picture Dana in Winnipeg, who drove for a delivery app on weekends. Her return suddenly needs business income, a vehicle log and GST/HST questions. A basic free tier might not cover that, and she’d find out only at the last step. If you work for yourself, choose software with a business section for income, expenses and the home office claim. Then run the self-employed tax calculator to see roughly what you’ll owe, including both halves of the CPP contribution.
When is a professional the better choice?
Software does well while the rules are clear. Pay a tax preparer or accountant if you have a large gain, a business with employees, an audit letter, unfiled years or income from several countries. Do the same if you can’t tell which credits you can claim. Their fee is often small next to a mistake that costs you a refund or brings a penalty.
How do you check the software’s answer?
Whatever you use, compare its result with an independent estimate before you press send. For example, the income tax calculator shows $15,551 of federal and Ontario tax on $85,000 of employment income, or 18.3% of that income. If your software lands far away from that kind of figure, hunt for a missing slip or a credit you claimed by mistake.
The tax refund calculator lets you set the refund or balance you expect against what the program reports. And if the software suggests a credit, the tax credits calculator tells you whether it’s worth the paperwork.
What should you have ready before you open the program?
Gather your T4, T5 and other slips, last year’s notice of assessment, receipts for anything you plan to claim, and your direct deposit details. Your CRA account often lets the software auto-fill slips, which cuts typing, though it’s worth glancing over every imported line. Ten minutes of gathering beats an hour of hunting mid-return.
What goes wrong most often?
- People trust a refund figure before every slip has arrived. T4A and T5 slips can come late.
- They assume free means unlimited. Read what’s included for your forms.
- They skip the review screen, and wrong bank details delay the refund.
- They forget that our calculators only give estimates: they count the basic personal amount, the employment amount, and CPP or QPP and EI credits, and leave out many other claims.
- And no program replaces advice on a complex file.
What this page is based on
Deadlines and tax data for 2026 come from the published Canada Revenue Agency and provincial sources, and the calculator maths uses the same tables. We’re an independent site, and no government body is behind it. Product features and prices change every season, so we don’t compare products here. Check the agency’s list of certified software for the current year.
Frequently asked questions
Do I need certified software to file online?
Yes. The CRA accepts online returns only from certified products, sent through NETFILE.
Is free software enough for my return?
Often, if you have a few slips and standard credits. Rental, business or foreign income may push you to a paid tier.
When is the filing deadline?
For 2025 returns it is April 30, 2026 for most people. Self-employed filers have until June 15, but tax owing is still due April 30.
Can software make mistakes?
It only uses what you enter or import, so a missing slip or a wrong amount carries through to the return.
When should I hire a professional instead?
Think about one for large gains, a business with staff, audit letters, unfiled years or income from other countries.
- 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