CRA Notice of Assessment (NOA) Explained — How to Read Every Line of Your 2025 NOA

After you file your T1, CRA issues a Notice of Assessment (NOA) — the official document that confirms whether your return was accepted as filed, whether you are getting a refund or owe a balance, and the key carryforward numbers you will need next year.

Most Canadians glance at the refund line and file the NOA away. That is a mistake. The NOA contains the numbers you will reach for all year long: RRSP deduction room, TFSA contribution room, unused capital losses, tuition carryforward, and the CRA’s record of any errors they caught in your return.

When You Receive Your NOA

The NOA timing depends on how you filed.

Filing Method	Typical NOA Delivery
NETFILE via tax software	2 weeks to CRA My Account (email notification same day)
ReFILE (amended NETFILE)	2–4 weeks to My Account
Paper return	8 weeks by mail during off-peak, up to 12 weeks during tax season
After a CRA review or request for receipts	Paused until review closes, then issued within 2 weeks

If you have signed up for online mail in My Account, you will receive an email the moment the NOA is available — the paper copy is suppressed. This is the fastest and most reliable channel.

Anatomy of the NOA

Every NOA has the same structure. Read it in this order:

1. Header — Account Identification

• Your name, SIN, and tax year
• The date of assessment (CRA’s official processing date — this is what matters for interest calculations, not your filing date)
• The tax centre that processed the return

2. Summary of Assessment

This is the one-line answer: refund, balance owing, or nil.

• A positive “Refund” line means CRA owes you — the amount will be direct-deposited (if you have banking on file) or mailed as a cheque
• A positive “Balance owing” means you owe — due immediately, with arrears interest accruing from April 30
• A nil assessment means your withholdings exactly matched your liability

3. Explanation of Changes and Other Important Information

This is the most important section and the one most filers miss. CRA lists:

• Any corrections they made to your filed return (common ones: slip mismatches, RRSP over-contribution flags, prior-year carryforward adjustments)
• Matching issues — slips the employer reported to CRA that you did not include
• Warnings about deductions or credits CRA questions but has accepted for now
• Follow-up actions — whether CRA intends to review receipts or documents

If this section is blank or just says “No changes were made to your return,” your filing was accepted as-is.

4. Tax Calculation Summary

The line-by-line arithmetic of your T1 as CRA calculated it. Compare against your tax software’s summary. Common discrepancies:

• Total income differs by a missed slip (T4, T5, T3, RRSP contribution receipt)
• Non-refundable credits differ by missed or transferred tuition, donation, or disability amounts
• Provincial tax differs because you moved provinces mid-year and the province-of-residence-on-December-31 rule applied differently than expected

If the CRA number matches your return exactly, filing is clean.

5. RRSP Deduction Limit Statement

The single most-consulted number on the NOA. It shows:

• Your RRSP deduction limit for the upcoming year (contributions in 2026 that can be deducted)
• Unused contribution room carried forward from all prior years
• Pending contributions you have made but not yet deducted
• The calculation itself: 18% of prior-year earned income, minus pension adjustment (Box 52 of your T4), capped at the annual RRSP dollar limit

Use the number shown here — not what your software estimated. Over-contributing even by $1 above the $2,000 lifetime cushion triggers a 1% per month penalty on the excess.

6. TFSA Contribution Room (Shown Separately in My Account)

The TFSA contribution room is not on the paper NOA — you must check CRA My Account → TFSA to get the official figure. Many filers make the mistake of relying on the cumulative-limit chart circulated online; those miss:

• Any withdrawals from prior years (which add back to room on January 1 of the following year)
• Any over-contribution adjustments you paid off
• Room earned for years you were a non-resident

If the My Account figure conflicts with what you calculated, trust CRA — and always leave a small buffer given the 1% per month TFSA over-contribution penalty has no cushion.

7. Carryforward Balances

The bottom of the NOA lists every balance that rolls forward to future years:

• Unused capital losses (Schedule 3 net — can offset capital gains in future years or carry back 3 years)
• Unused non-capital losses (from business or property — carry forward 20 years)
• Tuition, education, and textbook carryforward (federal and provincial amounts, separate)
• Disability Tax Credit transferred from dependant — unused portion
• Minimum tax carryover (7-year window)
• Investment tax credit carryforward (for business filers)

Save these numbers. Tax software imports them from prior-year NOAs automatically if you link My Account, but if you switch software or file manually, the NOA is the authoritative source.

Refund or Balance Owing — What Happens Next

Refund

• Direct deposit arrives 5–8 business days after the NOA date if banking is on file
• Paper cheque arrives 2–4 weeks by mail
• CRA pays refund interest on any overpayment from 30 days after the later of (a) April 30 or (b) your actual filing date, at the Treasury Bill rate + 2% (currently around 6% annualized)

For the full processing-time breakdown — NETFILE vs paper, when to expect the deposit, and what to do if it stalls — see When will my CRA refund arrive?.

If the refund is held up, it is usually because:

1. CRA is applying it against another balance (GST/HST owing, student loan, spousal support arrears)
2. The return is under review
3. There is a flag on your account you have not addressed

Log into My Account → Accounts and payments to see exactly where the refund went.

Balance Owing

• Payment is due April 30 regardless of when CRA issues the NOA
• Arrears interest accrues from May 1 at Treasury Bill + 4% (currently around 8% annualized)
• Pay via CRA My Account, online banking (CRA payee), pre-authorized debit, or a Canada Post in-person payment voucher
• If you cannot pay in full, request a payment arrangement through My Account — CRA will generally accept 12–18 months of monthly installments without penalty, though interest continues

Ignoring a balance owing is the single worst mistake. CRA has strong collection powers — garnishing wages, freezing bank accounts, setting off GST credits — and interest compounds daily. If you also missed the filing deadline, see what happens when you miss April 30 — late-filing penalties stack on top of arrears interest.

When CRA Reassesses You (After the Initial NOA)

CRA has 3 years from the date of the initial NOA to reassess a return as a matter of routine. Beyond 3 years, CRA needs to show misrepresentation, neglect, or fraud.

You will receive a Notice of Reassessment when CRA:

• Finds a slip you did not report
• Rejects a deduction or credit after review (common: home office, vehicle, medical, rental expenses)
• Applies a carryback from a later year you filed (capital loss carryback, for example)
• Correlates information from an audit or a third-party filing

A Notice of Reassessment looks identical to the NOA but is clearly labelled “reassessment” and shows the adjustments in the Explanation of Changes section.

If you discover an error you want to fix yourself — a missed slip, forgotten RRSP top-up, late donation receipts — the cleaner path is a self-initiated adjustment, not waiting for CRA to find it. See How to fix a filed Canadian tax return — T1-ADJ, ReFILE & the 10-year window.

How to Dispute: Notice of Objection

If you disagree with the NOA or a reassessment, you have 90 days from the date on the notice to file a Notice of Objection (Form T400A).

How to file:

1. Log into My Account → Register my formal dispute
2. Or mail Form T400A to the Chief of Appeals at your tax centre
3. Include the specific assessment lines you disagree with and your reasoning
4. Attach supporting documents (receipts, correspondence, third-party confirmation)

After filing, an Appeals Officer (independent from the original auditor) reviews your file. Outcomes:

• Fully allowed — CRA issues a new NOA with your claimed position
• Partially allowed — NOA reassessed to a middle position
• Disallowed — your only remaining option is the Tax Court of Canada, which you must petition within 90 days of the Appeals decision

Appeals can take 6–18 months. Interest continues to accrue on any disputed balance owing, but if you win, CRA refunds the interest with their own refund interest on top.

NOA vs Statement of Account

These are different documents:

• NOA — assesses a specific tax year’s T1
• Statement of Account — shows the current balance across all years, including GST/HST and instalment interest

Never reconcile your refund expectations against a Statement of Account alone; it can include balances from prior-year reassessments, GST credits, or benefit overpayments that CRA is netting against your refund.

Documents to Save

Retain every NOA and reassessment for at least 6 years from the end of the tax year. CRA can request documentation going back that far, and your NOA is the primary record of:

• Prior-year income that seeds pension calculation
• Capital gains and loss history
• RRSP room genealogy
• Mortgage and loan applications that require “income as reported to CRA”

If you discover you do not have a prior-year NOA, you can print or download replacements from CRA My Account → Tax returns → View returns for any year in the last 10.

Bottom Line

The NOA is not a receipt you file away — it is the foundation for next year’s RRSP planning, the authoritative source for your TFSA room history, and your only record of carryforward balances. Read the Explanation of Changes section first, verify the Tax Calculation Summary against your software, then save the RRSP Deduction Limit and carryforward numbers somewhere you can find them in January when contribution season begins again.

If you disagree with anything on it, you have 90 days to file a formal objection — do not miss that window.

Sources

• CRA — Understanding your Notice of Assessment
• CRA — Objecting to an assessment or reassessment (T400A)
• CRA — Prescribed interest rates