You just filed your corporate T2 return for a 12-person contractor firm in Ontario. A few weeks later, a brown envelope from the Canada Revenue Agency lands in your mailbox, or a notification pings in your My Business Account portal. Your heart rate jumps. Is it a refund? A bill? A request for more information?

This is your CRA Notice of Assessment (NOA). It is the official document the CRA issues after it reviews your tax return. For Canadian businesses, understanding the NOA is not optional. It confirms your tax balance, your refund status, and any changes the CRA has made. Mismanaging it can cost you interest, penalties, and time.

This guide walks through what a CRA Notice of Assessment is, how to read it, what to do if you disagree, and how to keep your records straight so future notices are boring.

What Is a CRA Notice of Assessment?

A CRA Notice of Assessment is the official letter the CRA sends after it processes your tax return. It is not a bill or a refund cheque by itself, though it usually tells you which one to expect. The NOA summarizes the CRA's calculation of your tax balance, including any changes the CRA made to your filed return.

For individuals, the NOA covers personal income tax. For corporations, the equivalent is the Notice of Assessment for a T2 return. The CRA also issues notices for GST/HST returns, payroll remittances, and other filings. In every case, the notice serves as the CRA's formal determination of your tax liability for that period.

The NOA is legally significant. Once issued, it starts the clock on your objection period. You generally have 90 days from the date on the notice to file a formal objection if you disagree. After that, the assessment becomes final unless the CRA reassesses later.

How to Read Your Notice of Assessment

The NOA follows a standard format. Knowing where to look saves time and prevents mistakes.

Key Sections of a Corporate NOA

Most corporate NOAs include these sections:

  • Assessment Details: Your business number, tax year-end, filing date, and the date of the notice.
  • Summary of Changes: A line-by-line comparison of the amounts you reported and the amounts the CRA assessed. This is the most important section if the CRA changed your return.
  • Balance Owing or Refund: The net amount you owe or will receive. If you owe, the notice includes the payment deadline and any interest or penalties charged.
  • Instalment Reminder: If your balance is over a threshold, the CRA may require quarterly instalment payments for the next year. The NOA will show the amounts and due dates.
  • Explanation of Changes: If the CRA disallowed an expense or adjusted an income figure, there will be a brief reason, such as "expense not supported by receipts" or "capital cost allowance recalculated."

Sample Table: What the Sections Mean

Section What It Tells You
Assessment date Deadline for objection (90 days from this date)
Changes to income If the CRA added or removed income, check your records
Changes to deductions Common adjustments: meals and entertainment, home office, vehicle expenses
Interest and penalties Calculated from the balance due date; may be reversible if you file on time
Instalment amounts Required for next year if your balance exceeds $3,000 (individual) or $3,000 (corporate, different thresholds apply)

What to Check First

  1. Verify your personal or business information: Name, address, business number, and tax year-end must match your records.
  2. Compare reported vs. assessed amounts: If the CRA changed your return, the notice will show each line that was adjusted. Look for the reason code or explanation.
  3. Check the balance: Is it a refund or amount owing? If it is a refund, the CRA will either direct deposit it or mail a cheque. If it is an amount owing, note the payment due date.

What Happens After the NOA Is Issued

Once the NOA is issued, several things happen automatically.

Refund Processing

If you are owed a refund, the CRA typically issues it within two weeks for electronically filed returns with direct deposit. Paper returns take longer, often eight weeks or more. If you signed up for direct deposit through My Business Account, the money lands in your bank account faster.

Balance Owing and Payment Deadlines

If you owe tax, the NOA shows the balance due. For corporations, the balance is generally due two months after the tax year-end, but the NOA may include interest if you paid late. For individuals, the balance is due April 30 of the following year. If you are self-employed, you have until June 15 to file, but any balance is still due April 30. Interest on late payments compounds daily.

Instalment Requirements

If your balance exceeds a threshold, the CRA will require quarterly instalment payments for the next tax year. The NOA includes the instalment amounts and due dates. Missing instalments can trigger penalties and interest.

Reassessment Window

The CRA can reassess your return within three years of the original NOA (four years for some complex situations). If the CRA finds an error later, it will issue a Notice of Reassessment. You have the same 90-day objection window from that new notice.

Common Issues That Trigger Reassessments

Many reassessments stem from preventable errors. Here are the most common triggers.

Unreported Income

The CRA cross-references T4 slips, T5 investment income, and GST/HST returns. If you forget to include a T4 from a part-time job or a T5 from a savings account, the CRA will add it and charge tax on the unreported amount. For businesses, unreported revenue from payment processors like Square or PayPal is a common flag.

Disallowed Expenses

Home office expenses, vehicle expenses, and meals and entertainment are frequent targets. If you claim the home office deduction but do not have Form T2200 (for employees) or cannot show the workspace is your principal place of business, the CRA may disallow it. Vehicle expenses require a mileage log. Meals and entertainment are generally 50% deductible, and the CRA checks for receipts.

GST/HST Discrepancies

If your GST/HST return does not match your income tax return, the CRA may reassess both. For example, if you report $100,000 in revenue on your T2 but only $80,000 on your GST return, the CRA will ask why. Mismatches like this are a red flag.

Late Filing Penalties

If you file your return after the deadline, the CRA charges a late-filing penalty: 5% of the balance owing, plus 1% per month for up to 12 months. The NOA will show this penalty if applicable.

How to Dispute or Correct a Notice of Assessment

If you believe the NOA is wrong, you have options. Do not simply ignore it.

Step 1: Request an Adjustment

If the error is a simple mistake, such as a missing receipt you now have, you can request an adjustment. For individuals, use Form T1-ADJ. For corporations, use Form T2-ADJ. You can also make adjustments online through My Business Account. The CRA will review and issue a Notice of Reassessment if it agrees.

Step 2: File a Notice of Objection

If the CRA denies your adjustment request or you disagree with a change, file a formal Notice of Objection using Form T400A (for individuals) or Form T2-ADO (for corporations). You have 90 days from the date on the NOA. The objection must state the facts and reasons for your disagreement. The CRA's Appeals Division will review your case.

Step 3: Go to Tax Court

If the Appeals Division upholds the assessment, you can appeal to the Tax Court of Canada. This is a legal process and you may want professional representation.

Practical Tip: Keep Supporting Documents

The best defense is a good offense. Keep receipts, contracts, mileage logs, and bank statements for at least six years after the tax year. If the CRA challenges an expense, you need to prove it was incurred for business purposes.

Avoiding NOA Problems with Better Recordkeeping

Many NOA issues trace back to messy books. If your accounting software does not track expenses properly, you are more likely to miss income, misclassify deductions, or file late.

Manual vs. Automated Workflow Comparison

Manual bookkeeping: You enter transactions by hand, categorize expenses at year-end, and hope your receipts are all in one shoebox. If the CRA asks for a receipt, you scramble. If you miss a T5, you get reassessed.

Automated bookkeeping: Transactions flow from bank feeds into categorized accounts. Receipts are scanned and attached to expenses. Payroll is calculated with CPP, EI, and income tax deductions. At tax time, financial reports are ready. The CRA gets accurate numbers, and you have the backup if they ask.

For Canadian businesses, using a platform that handles Canadian payroll, GST/HST tracking, and bank feeds reduces errors. Many small business owners and CPA firms use Awditify to centralize their accounting, keep audit-ready records, and generate the reports needed for tax filing. The platform's AI transaction categorization and receipt OCR mean fewer manual entries and fewer mistakes.

For municipalities, the stakes are higher. PSAB reporting and property tax billing require precise records. A reassessment on a municipal return can delay budgets and audits. The municipal finance module in Awditify handles property tax billing, utility billing, and PSAB-compliant reporting, reducing the risk of errors that trigger reassessments.

Frequently Asked Questions

What is a CRA Notice of Assessment and why did I get one?

A CRA Notice of Assessment is the official letter the CRA sends after processing your tax return. It confirms the amount of tax you owe or the refund you will receive, and it shows any changes the CRA made to your return. You get one every time you file a return, whether personal, corporate, or GST/HST. It is not a bill by itself, but it tells you what you owe.

How long does it take to get a CRA Notice of Assessment after filing?

For electronically filed returns, the CRA typically issues the NOA within two weeks. For paper returns, it can take eight weeks or more. If you file through a CPA firm or use software that supports Netfile, you will get the NOA faster. Direct deposit also speeds up refunds.

What should I do if my CRA Notice of Assessment is wrong?

First, review the changes the CRA made. If you have supporting documents, request an adjustment through My Business Account or by filing Form T1-ADJ (individual) or T2-ADJ (corporate). If the CRA denies your request or you disagree, file a Notice of Objection within 90 days of the NOA date. Do not ignore it, because the assessment becomes final after the objection period.

Can the CRA reassess me after the Notice of Assessment?

Yes. The CRA generally has three years from the original NOA to reassess your return. For some situations, such as negligence or fraud, the window is longer. A reassessment results in a new Notice of Reassessment. You have the same 90-day objection period from that new notice.

What is the best way to avoid CRA reassessments?

Keep accurate books year-round. Use accounting software that tracks income and expenses, categorizes transactions, and supports Canadian payroll and GST/HST. Many Canadian businesses use Awditify because its AI transaction categorization and bank feeds reduce errors, and its receipt OCR ensures you have the documentation to support deductions. For CPA firms, the practice management tools help track client deadlines and documents, so nothing is missed.

What to Do Next

Your CRA Notice of Assessment is not just a piece of paper. It is the CRA's official word on your tax liability. Read it carefully, check the changes, and respond within the 90-day window if something is off. The best way to avoid unpleasant surprises is to keep your books clean throughout the year.

If you are tired of scrambling for receipts at tax time or worrying about missed deadlines, consider a platform built for Canadian accounting. Awditify combines bank feeds, AI categorization, Canadian payroll, GST/HST tracking, and receipt OCR in one place. For CPA firms, the practice management features keep client files organized and deadlines visible. For municipalities, the property tax billing and PSAB reporting modules reduce the risk of errors that lead to reassessments.

Start with a free demo to see how Awditify can simplify your tax compliance.