Letter Check
Upload your CRA letter and return. Get a plain verdict on whether CRA is right, what it costs, your deadline and the exact steps, with a calendar reminder.
CRA letters are written to be correct, not to be understood. Letter Check tells you what yours means, whether CRA has it right, and exactly what to do by when.
The short version
- Upload the letter, the return it's about (optional, but it helps a lot), and a few lines of your side of the story.
- You get a verdict (CRA looks right, partly right, or wrong), what changed in dollars, your deadline, and the steps in order.
- Add the deadline to your calendar in one click, with reminders two weeks and three days before.
- If you need to send receipts, object or ask for penalty relief, it tells you which, and why.
- $39.00 + HST, four checks per order. Unlimited with the Tax Year Pass.
Secure checkout by Stripe. Your private workspace opens right after payment. Quebec is not covered yet.
Who does the work: our software and AI read your documents, our calculator checks every number, and a second AI review checks the findings. No accountant reviews it. See a sample report · How we test it
Just want to know what the letter says? The document analyzer explains it free. Letter Check goes further: it compares the letter with your return and your side, and tells you whether CRA is right.
Most CRA Letters Are About One Line
A brown envelope from CRA gets the same reaction as a noise from the engine on the highway. In most cases it's smaller than it sounds: CRA matched a slip you missed, wants a receipt for a claim, or changed one line of your return. The trouble is the letter rarely says which in plain English, and the deadline hides in the second paragraph.
Letter Check reads it the way a tax preparer would: what CRA did, why, what it costs, and whether your documents say otherwise.
What You Get
- What CRA is saying, in two or three plain sentences.
- A straight verdict. If CRA is right, we say so and focus on paying or fixing it cheaply. If your return or your story says otherwise, we say what proves it.
- What changed, line by line: the amount as filed, as changed, and the effect on your tax.
- Your deadline. The response date printed on the letter, or for a notice of assessment or reassessment, the last day to object, worked out by our objection deadline calculator.
- The steps, in order, the documents to gather, and whether to pay the part you don't dispute now to stop interest.
- The right next step: send proof with the Review Response Pack, dispute it with the Objection Pack, ask for penalty and interest relief, or see a professional when the stakes justify one.
Letters It Reads
- Notices of assessment and reassessment (see what to do after a reassessment)
- Review letters asking for receipts or proof (pre-assessment, processing review, matching)
- Proposal letters before a reassessment
- Statements of account and balance-owing letters
- Benefit and credit notices (Canada child benefit, GST/HST credit) and instalment reminders
- GST/HST notices for small businesses
It doesn't read Revenu Québec letters in depth, and it won't replace a tax lawyer for gross negligence penalties, audits of a business, or anything that mentions prosecution.
CRA wants receipts? Send exactly what they asked for
The Review Response Pack lists every item CRA asked for, checks each receipt against it, flags the gaps, and writes the cover letter.
Deadlines Are the Part That Bites
For an individual's income tax notice of assessment or reassessment, you can object until the later of 90 days after the notice date or one year after the filing due date for that year. Review letters set their own response date, printed on the letter; if you need more time, call the number on the letter before it passes. Miss either and the cheap fix turns into an expensive one. Letter Check puts the date at the top of the result and in your calendar.
Expecting more than one letter this year?
The Tax Year Pass includes Letter Checks all year, a household Return Check and a Review Response Pack, for one payment.
See a Sample Letter Check
Want to see one first? Here is a sample Letter Check for a reassessment that took away a medical expense claim, with the dollar change worked out and the deadline counted. Our software and AI do the reading and writing, our calculator does the dates and dollars, and no accountant reviews it. How we test it.
Letter Check Questions
What should I do when I get a letter from CRA?
Find the deadline first, then work out what CRA changed or wants. Most letters are about one line of your return. Gather the proof, respond through My Account before the date on the letter, and pay any amount you do not dispute to stop interest.
How do I know if CRA’s reassessment is wrong?
Compare each change on the notice with your return and your records. If you have proof that the original amount was right, CRA can be asked to change it back, by sending documents or filing a notice of objection. Letter Check does this comparison and gives a plain verdict.
How long do I have to respond to a CRA letter?
A review letter prints its own response date. For a notice of assessment or reassessment, an individual can object until the later of 90 days after the notice date or one year after the filing due date for that year.
Can Letter Check talk to CRA for me?
No. It tells you what to send and when. You, or a representative you authorize, deal with CRA.
Is the letter stored?
No. Pages are read once and not saved on our server. Your results stay in your own browser.
Sources: CRA, Responding to us; CRA, P148, Resolving your dispute. Checked October 2026. A check of the documents you provide, not tax advice. CanadianTaxes.ai is not the Canada Revenue Agency.
Last reviewed October 11, 2026 against CRA and Government of Canada sources. How we check our facts.