Have you ever filed your taxes took a breath and then wondered what that letter from the CRA actually means? I have. I know how confusing it can be. The truth is, many Canadians mix up their tax return with their notice of assessment, but they are completely different. Your tax return is what you send to the CRA while your notice of assessment is what the CRA sends back to you. Understanding this difference can help you avoid mistakes, spot errors and make sure you are not missing out on money. In this guide I will explain everything you need to know about the notice of assessment versus the tax return, what each one’s why each one is important and how to use them to your advantage. By the end you will never confuse these two documents again.
What Is a Tax Return?
Let me start with the document you already know. A tax return, officially called the T1 General, is the form you fill out and send to the Canada Revenue Agency (CRA) every year. This is your chance to tell the CRA about your income, claim deductions and credits and figure out how tax you owe or what refund you are expecting. Think of your tax return as your side of the conversation. You are giving the CRA all the information they need to figure out your tax situation for the year. You can file your tax return using paper forms, tax software or with a tax preparer. Once you press submit, your part of the process is done, for now.
What Is a Notice of Assessment?
Now here’s where things get interesting. A notice of assessment (NOA) is the document the CRA sends you after they process and look at your tax return. It is the CRA’s response, their side of the conversation. Your notice of assessment is a summary of your tax return that shows what the CRA agrees with what they changed and most importantly whether you owe money or are getting a refund. The CRA sends you a notice of assessment every year that you file your taxes. It is proof that your tax return has been received and reviewed. Think of it as a receipt for your taxes. It is much more than that.
The Key Difference Between a Tax Return and a Notice of Assessment
Here is the point: your tax return is what you send to the CRA. Your notice of assessment is what the CRA sends back to you. One is your calculation; the other is the CRA’s result. I have seen many people treat these documents as the same and that can cause confusion. Your tax return is based on your numbers, what you think you owe or what refund you expect. Your notice of assessment is the CRA’s decision on what you actually owe or what refund you actually get. If there is a difference between the two, your notice of assessment is the one that matters. It is the result from the CRA.
What Information Appears on Your Notice of Assessment?
Your notice of assessment has important parts that every taxpayer should know about. The account summary shows the result whether you are getting a refund, owe money or have a zero balance. The tax assessment summary explains how the CRA figured out your refund or the amount you owe. The explanation of changes section is very important; it tells you if the CRA made any changes to your tax return and why. Your notice of assessment also includes your RRSP deduction limit for the year. If you are a student, you will see unused tuition amounts that you can use in the future. You will also find your NETFILE access code, which you need if you file online year. Keep your notice of assessment in a place; you will need it for future tax years.
What Happens If the CRA Changes Your Tax Return?
This is where the notice of assessment becomes very important. Sometimes the CRA will look at your tax return. Make changes, adding income you forgot to report, not allowing deductions you claimed or fixing mistakes. When this happens, your notice of assessment will explain what they changed and why. If the CRA makes changes to your tax return, they will send a notice of reassessment (NOR) instead of a regular NOA. This is an updated version that shows the changes. Don’t ignore a notice of assessment that shows changes from your tax return. Compare the line numbers on your NOA with what you sent. If you don’t agree with the changes, you have 90 days from the date of the notice of assessment to file an objection.
Why Your Notice of Assessment Matters for Future Tax Years
Your notice of assessment is not just important for this year; it affects your taxes in years too. The RRSP deduction limit on your notice of assessment tells you how much you can put into your RRSP year. Your unused tuition amounts can be carried forward. Used in future years. The Home Buyers Plan and Lifelong Learning Plan information on your notice of assessment shows your repayment commitments. Without your notice of assessment you might miss out on credits and deductions you are entitled to in years. Keep every notice of assessment you receive – they are the record of your tax situation year after year.
When Will You Receive Your Notice of Assessment?
The time you get your notice of assessment depends on how you filed. If you filed online using software your notice of assessment is available in your CRA My Account soon as your return is processed, often right away. If you filed by mail you may have to wait 2 to 8 weeks. The CRA has made digital delivery easier in 2026. Paper filers should still expect delays. You can check the status of your tax return using the progress tracker in your CRA account. If you have not received your notice of assessment within the time, log into your CRA My Account to check for updates.
Common Mistakes to Avoid
I have seen many taxpayers make these mistakes with their notice of assessment and tax return. Don’t ignore your notice of assessment; many people avoid opening it because they are worried about news but that only makes problems worse. Don’t think your tax return calculations are final; always check your notice of assessment against what you sent. Don’t throw away your notice of assessment; you will need it for years and you may need to refer to it if the CRA has questions. Don’t wait long to challenge changes; you have only 90 days from the date of the notice of assessment to file an objection. Don’t forget to keep your notice of assessment close when speaking with the CRA; agents will ask for information from it to confirm your identity.
Conclusion
Understanding the difference between your tax return and your notice of assessment is important for every taxpayer. Your tax return is your submission, your calculation of what you owe or what refund you expect. Your notice of assessment is the CRA’s response to their decision on your actual tax situation for the year. One is what you send; the other is what you receive. Do not treat them as the same document. Look at your notice of assessment every year compare it to your tax return and take action quickly if you see errors or disagree with changes. Your notice of assessment has information you will need for future tax years, keep it safe. If you ever feel unsure, remember that tax professionals can help you understand your notice of assessment and make sure you are taking every deduction you should.
Frequently Asked Questions (FAQs)
Your tax return is the form you fill out and send to the CRA. Your notice of assessment is the document the CRA sends back to you after processing your return showing their decision on your tax situation.
Your notice of assessment includes your account summary (refund, balance owing or zero balance) tax assessment summary, explanation of any changes made to your return RRSP deduction limit and other important details for years.
If you filed online your notice of assessment is usually available away in your CRA My Account. If you filed by mail you can expect to wait 2 to 8 weeks.
Read the explanation of changes carefully. Compare the numbers on your notice of assessment with what you sent. If you disagree you have 90 days from the date of the notice of assessment to file an objection.
Your notice of assessment has details you will need for future tax years, including your RRSP deduction limit, unused tuition amounts and repayment responsibilities for the Home Buyers Plan.
Yes. You can. Print your notice of assessment through your CRA My Account online. You can also access it through the CRA's app.
Co-Founder & Director
Hafil Perincheeri is an engineer-turned-realtor, investor, and builder based in Calgary, Canada. As Co-Founder and Director of Greencasa, he specializes in home flips, property development, and investment strategies. Since 2019, he has guided clients in home buying, multifamily investing, and financing options like CMHC and MLI Select, ensuring transparent, informed decisions.