First Time Filing Taxes in Canada (2026): What to Claim, What to Avoid, and How CRA Assesses You

ITA s.150, s.152, s.162 | CRA Guide T4012

You earned your first paycheque.
Or you arrived in Canada.
Or you turned 18 and someone said, “You need to file taxes.”

Filing your first tax return is not complicated — but it is legal compliance under the Income Tax Act.

And the first return sets the foundation for:

• Benefit eligibility
• Contribution room (RRSP/TFSA/FHSA)
• CRA’s assessment history
• Instalment obligations

Let us walk through this properly — not casually.

 

1. Do You Have to File? (ITA s.150)

Under ITA s.150, every individual must file a return for a taxation year if certain conditions apply.

You are required to file if:

• You owe tax
• CRA sends you a demand to file
• You disposed of capital property
• You are claiming certain benefits or credits
• You received certain types of income (self-employment, taxable benefits, etc.)

Even if you owe no tax, filing may still be necessary — and beneficial.

 

Why File If You Owe Nothing?

Because filing:

• Triggers GST/HST credit eligibility
• Establishes Canada Child Benefit eligibility (if applicable)
• Creates RRSP contribution room
• Updates CRA records
• Establishes residency status for tax purposes

Many first-time filers miss refunds and benefits simply by not filing.

 

2. Deadlines: When Must You File?

For most individuals:

• Filing deadline: April 30, 2027 (for 2026 taxation year)
• If self-employed: June 15 (but tax still due April 30)

If you owe tax and file late:

ITA s.162 imposes a penalty:

5% of unpaid tax

• 1% per month late (up to 12 months)

Even first-time filers are not exempt.

 

3. What Is “Net Income” vs “Taxable Income”?

These terms matter.

Net Income (Line 23600)

This is:

• Total income
• Minus certain deductions

Net income determines:

• Benefit eligibility
• OAS clawback (later in life)
• Certain tax credits

 

Taxable Income (Line 26000)

Taxable income is:

• Net income
• Minus additional deductions

This is the amount used to calculate federal and provincial tax.

A common misconception:

“If my tax payable is zero, I don’t need to file.”

Incorrect.

Net income affects benefits — even when tax payable is zero.

 

4. Understanding CRA Slips (T4, T4A, T5)

Your income is reported to CRA by third parties.

Common slips:

• T4 – Employment income
• T4A – Scholarships, grants, contract income
• T5 – Investment income

Under ITA s.152, CRA assesses your return based on:

• The information you report
• The slips filed by third parties

If you omit income that CRA already has on file, you may receive a reassessment.

 

What If You Are Missing a Slip?

Do not ignore the income.

If:

• You worked
• You earned interest
• You received contract income

You must report it — even if the slip has not arrived.

Use:

• Your pay stubs
• Bank statements
• CRA “My Account” portal

Failure to report income can trigger penalties under ITA s.163 in repeat cases.

 

5. Refund vs Balance Owing

A refund does not mean “free money.”

It means:

• Too much tax was withheld from your pay

A balance owing means:

• Not enough was withheld
• Or additional income was earned

Your Notice of Assessment will confirm:

• Tax payable
• Refund or amount owing
• Contribution room updates

Understand the mechanics — do not react emotionally to the number.

 

6. Instalments: When CRA Requires Prepayments

If you owe tax repeatedly over certain thresholds, CRA may require quarterly instalments.

This typically affects:

• Self-employed individuals
• Gig economy workers
• Investors with insufficient withholding

Ignoring instalment requirements creates interest exposure.

First-time filers rarely face this — but freelancers often do by year two.

 

7. CRA “My Account”: Use It — But Carefully

CRA’s My Account allows you to:

• View slips
• Track TFSA/RRSP room
• See instalment notices
• Monitor assessment status

However:

Do not rely solely on pre-filled data.

Pre-fill reflects what CRA has — not necessarily what is correct.

You remain responsible for accuracy under ITA s.150.

 

8. How CRA Assesses Your Return (ITA s.152)

Once filed, CRA will:

• Review your return
• Match slips against reported income
• Issue a Notice of Assessment

Under ITA s.152, CRA may:

• Assess
• Reassess
• Request supporting documentation

Your Notice of Assessment is not casual correspondence.

It is a statutory document.

Review it carefully.

 

9. Recordkeeping: How Long Must You Keep Documents?

Generally:

• Keep records for six years after the end of the tax year

CRA may request:

• Receipts
• Slips
• Proof of deductions
• Moving expense documentation
• Tuition records

Lack of documentation may result in denial of claims.

 

10. Common First-Time Filing Mistakes

• Not reporting scholarship income properly
• Forgetting interest income from savings accounts
• Ignoring side-hustle income
• Claiming ineligible deductions
• Missing tuition transfer elections
• Failing to update marital status

Most errors are not malicious — but they are preventable.

 

11. Special Considerations for Newcomers

If you became a resident of Canada during the year:

You must report:

• Worldwide income from date of residency
• Canadian-source income prior to residency

Residency status determines tax scope.

Professional advice is often prudent.

 

12. When Should You Call a Professional?

You should not DIY if:

• You have foreign income
• You sold cryptocurrency
• You operated a side business
• You received self-employment income
• You moved provinces
• You received support payments
• You are unsure about residency

The first return shapes future years.

Precision now prevents compounded errors later.

 

Final Thoughts

Your first tax return is more than a form.

Under ITA s.150, filing is a legal obligation.
Under s.152, CRA assesses and may reassess.
Under s.162, late filing penalties apply.

Even if you owe nothing, filing establishes:

• Benefit eligibility
• Contribution room
• CRA compliance history

For young professionals and newcomers, disciplined first filing creates structural tax clarity.

If your situation involves employment income only, filing may be straightforward.

If it involves business income, foreign assets, crypto, rental property, or complex credits — treat it as planning, not paperwork.

At Shajani CPA, we do not simply file returns.

We architect tax compliance aligned with your long-term ambitions.

Tell us your ambitions, and we will guide you there.

This information is for discussion purposes only and should not be considered professional advice. There is no guarantee or warrant of information on this site and it should be noted that rules and laws change regularly. You should consult a professional before considering implementing or taking any action based on information on this site. Call our team for a consultation before taking any action. ©2026 Shajani CPA.

Shajani CPA is a CPA Calgary, Edmonton and Red Deer firm and provides Accountant, Bookkeeping, Tax Advice and Tax Planning service.