The CRA Sent You a Letter. Here's What Each One Actually Means — and What to Do

Published August 14, 2026 · PaperNorth CRA & Benefits · Canada-wide

Nothing quickens the pulse like a brown envelope from the Canada Revenue Agency. Here's the reassuring truth: most CRA letters are routine, and almost all of them become problems only when people ignore them. The skill isn't knowing tax law — it's identifying which letter you got, and responding before its specific deadline.

The letters, decoded

1. Notice of Assessment (NOA)

The receipt for your tax return. It confirms what you filed, what you owe or get back, plus your RRSP room. Not scary — but check it against what you filed. If the numbers differ, the CRA changed something, and the explanation is buried in the notice.

2. Notice of Reassessment

The CRA went back and changed a return you already filed — often because a T-slip they received didn't match what you reported. It usually comes with a balance owing, plus interest backdated to the original due date.

Your key right: if you disagree, you can file a Notice of Objection — generally within 90 days of the reassessment date. Miss it, and you're asking for permission to be late (extensions are possible up to one year, but discretionary). The 90-day clock is the single most important deadline in this article.

3. Review letters ("we're reviewing your return")

Not an audit. The CRA routinely spot-checks claims — medical expenses, tuition, childcare, donation receipts, moving expenses. The letter names the claim and gives a deadline (typically 30 days) to send documents. Send exactly what they ask for, keep copies, and reply through your CRA My Account or the reference number on the letter. If you don't reply, they simply disallow the claim and reassess you — turning a paperwork errand into a bill.

4. Benefit review / clawback letters (CCB, GST/HST credit, CWB)

These ask you to prove eligibility — marital status, residency, who the children live with. They're common after a separation or a move. The stakes are high because if you can't (or don't) respond, benefits stop and past payments become a debt. Respond with documents even if your situation is complicated — partial proof beats silence.

5. Collections letters

You owe, and the file has moved to collections. These escalate from reminders to legal warnings (which can precede wage garnishment or bank account holds). The good news: the CRA accepts payment arrangements, and hardship provisions exist. Call the number on the letter before the escalation, not after. Taxpayer relief applications can cancel interest and penalties in cases like serious illness, disaster, or CRA error.

6. "Instalment reminder"

If you owe more than $3,000 at filing two years running (self-employment, rental, investment income), the CRA asks you to prepay quarterly. Ignoring it doesn't create debt by itself — but it can create instalment interest if you do end up owing.

The response playbook (any letter)

1. Identify the letter type and find the deadline. It's always printed, usually in the first or last paragraph.
2. Verify it's really the CRA. The CRA does not demand payment by e-transfer, gift cards, or crypto, and does not threaten arrest by voicemail. When in doubt, log in to CRA My Account — real letters appear there too.
3. Gather documents before you respond — receipts, slips, statements. One complete reply beats three partial ones.
4. Respond through a channel that leaves a record (My Account submission with a confirmation number, or the specific address/fax on the letter).
5. Diarize the deadline minus a week. Especially the 90-day objection window — it's the one that quietly ends your options.

This article is general information, not tax or legal advice. Deadlines and programs change; confirm details on canada.ca or with a licensed tax professional. Sources: Canada Revenue Agency published guidance on assessments, objections (90-day window), review programs, benefits validation, and collections (canada.ca).