To file your Canadian taxes online, use a CRA-certified tax software product to prepare your return and transmit it through NETFILE. Most people can do it in under an hour once their slips are in hand. For the 2025 tax year, the filing and payment deadline is April 30, 2026, and self-employed filers (or their spouses) have until June 15, 2026, to file, though any balance owing is still due April 30.1Government of Canada. Due Dates and Payment Dates – Personal Income Tax2Government of Canada. What You Need to Know for the 2026 Tax-Filing Season
Gather Your Documents First
The single biggest time-saver is having everything in front of you before you open any software. Employers, banks, and pension administrators are required to issue your information slips by the end of February.3Canada Revenue Agency (CRA). Tax Slips – Personal Income Tax The common ones:
- T4 for employment income from each employer.
- T4A for pension, retirement, annuity, and similar income.
- T5 for investment income like interest and dividends.
- T4FHSA if you contributed to or withdrew from a First Home Savings Account.
- T2202 for tuition.
Then pull together receipts for anything you plan to claim: RRSP contribution receipts, FHSA contributions (transfers from an RRSP into an FHSA are not deductible), charitable donations, medical expenses, and childcare.4Justice Laws Website. Income Tax Act – Section 1465Government of Canada. First Home Savings Account (FHSA)
If you worked from home as an employee and want to claim home office expenses, you need a signed T2200 from your employer before you can use Form T777 to calculate the deduction. The pandemic-era temporary flat-rate method no longer applies.6Government of Canada. Home Office Expenses for Employees
Confirm You Can Use NETFILE
If you lived in Canada during the tax year and have a valid Social Insurance Number, you can almost certainly file through NETFILE. It’s designed for individuals filing their own returns. A few situations lock you out:
- Non-residents and emigrants for the tax year.
- Anyone who declared bankruptcy during the current or prior year.
- Very old returns falling outside NETFILE’s rolling window of recent tax years.
Quebec residents file the federal return through NETFILE like everyone else, but must also file a separate provincial return directly with Revenu Québec.7Government of Canada. Quebec – Income Tax Package Every other province and territory has provincial taxes rolled into the federal return automatically.
Pick Certified Software
The CRA publishes a list of certified software products each year, and NETFILE will only accept a return transmitted from one of them.8Government of Canada. Find Certified Tax Software Free web-based products handle straightforward T4-only returns without issue. Paid desktop products, roughly $20 to $100, mainly add support for rental income, investment portfolios, self-employment, and sometimes phone support. Most people don’t need to pay.
During setup the software asks for your SIN, date of birth, current address, and marital status. Get the marital status right. It feeds directly into the GST/HST credit and Canada Child Benefit calculations, and a wrong entry will misstate both.
The NETFILE Access Code
Your prior-year Notice of Assessment carries an eight-character alphanumeric access code on the right-hand side. It’s not required to file, but including it lets you use prior-return information to verify your identity if you later need to call the CRA.9Government of Canada. Notices of Assessment – NOA or NOR First-time filers won’t have one. Leave the field blank.
Auto-Fill My Return
If you have a CRA My Account, most certified products offer Auto-fill my return, which pulls your slips and other CRA-held data straight into the software.10Government of Canada. Auto-Fill My Return It can even populate your access code. Use it. It catches slips people forget, like a T5 for a small amount of interest on a savings account. Still, review every field against your own slips. The CRA cross-references what you report against what third parties report, and mismatches can trigger a review or a repeated-failure-to-report penalty.
Transmit the Return
Once your income, deductions, and credits are entered, the software shows a summary with your calculated tax owing or refund. Read it carefully. Does the total income match what you actually earned? A missing T4 is by far the most common error, and it’s obvious the moment you look at the total.
When the numbers look right, hit submit. The software encrypts the data and sends it to the CRA. A successful transmission returns a confirmation number immediately. Save it. Print it, screenshot it, email it to yourself. If a filing dispute ever comes up, that number settles the question of whether you filed on time.
No confirmation number means the transmission failed. Usual culprits are a dropped internet connection, CRA server maintenance, or a mistyped SIN. The software normally displays an error code telling you which.
Pay Any Balance Owing
Filing and paying are separate. Filing tells the CRA what you owe; paying settles it. If you owe money, payment is due by April 30 whether or not you’re self-employed.11Government of Canada. What You Need to Know for the 2026 Tax-Filing Seasona> The CRA accepts several methods:12Government of Canada. Make a Payment – Payments to the CRA
- Online banking. Add the CRA as a payee through your bank’s website or app. This is what most people use.
- CRA My Payment for a one-time payment with a Visa Debit or Interac-connected debit card. Credit cards aren’t accepted here.
- Pre-authorized debit set up through My Account. Schedule it at least five business days before the first withdrawal.
- Third-party providers like PaySimply, which accept credit cards and Interac e-Transfer for a processing fee. This is the only route to pay by credit card.
If you can’t pay in full by April 30, file on time anyway. The late-filing penalty is calculated on the balance owing on unfiled returns, so filing on time and paying late is far cheaper than doing both late.
What Late Filing Actually Costs
The CRA charges a late-filing penalty of 5% of your balance owing, plus 1% for each full month the return is late, up to 12 months.13Government of Canada. Interest and Penalties on Late Taxes Compound daily interest runs on top of the penalty on any unpaid balance. Those charges keep growing until the return is filed and the balance is cleared.
After You File
The CRA aims to process 95% of electronically filed returns within four weeks, versus eight weeks for paper.14Canada Revenue Agency (CRA). Check CRA Processing Times Once processed, you’ll get a Notice of Assessment showing the CRA’s final calculation. If you’re signed up for online mail in My Account, it appears there. Otherwise it comes by post.
Refunds arrive faster by direct deposit than by cheque. If you haven’t set that up in My Account, it’s worth doing. The CRA uses the same direct deposit information for all future payments, including the GST/HST credit.
If the CRA sees a discrepancy between your return and third-party data, they’ll write asking for supporting documents. The standard initial response window is 30 days, with extensions possible depending on scope.15Canada Revenue Agency (CRA). Obtaining Information During Compliance Activities Ignoring these letters lets the CRA adjust your return based on the information they already have, which rarely works in your favour.
Fixing a Mistake After You File
Wait for your Notice of Assessment before making any changes. You can’t amend a return until it’s been assessed. After the NOA arrives, you have two options.
ReFILE lets you submit changes through certified tax software, and every certified product now supports it.16Government of Canada. Changing a Tax Return – Personal Income Tax You don’t have to use the same software that filed the original, though it’s easier if you do. Open your saved return, correct it, and transmit.
“Change my return” through CRA My Account is the other route, and it lets you request changes for the ten previous calendar years.17Government of Canada. Need to Change Your Tax Return? You Can Do It Online! It walks you through common adjustments like adding a missed slip or claiming the disability tax credit. Once reviewed, you’ll receive either a notice of reassessment or a letter explaining why the change wasn’t made.
Keep Your Records for Six Years
Filing doesn’t end your obligations to the documents. The CRA requires you to keep supporting records for six years from the end of the tax year they relate to.18Government of Canada. Where to Keep Your Records That covers receipts, slips, bank statements, and anything backing up a claim. Digital copies are fine. If a past return is ever audited, organized records are the difference between a quick resolution and a reassessment with interest attached.