You can still fix unfiled tax returns in Canada after the Canada Revenue Agency (CRA) has estimated your tax, but your deadlines start running from the date on the notice. A CRA notice of reassessment issued because of missing returns is a legal determination of what you owe.
If you ignore it, penalties, interest, and collection action build on top of a number the CRA calculated without your deductions.
Take three steps right away: file accurate returns for every missing year, check the objection deadline printed on your notice, and decide whether to file a formal objection or apply to the Voluntary Disclosures Program before the CRA escalates. Filing the return on its own does not always protect your dispute rights.
When a business, holding company, or upcoming sale is involved, the stakes rise quickly. At Beganyi Law, we advise Ontario business owners on the point where corporate structure and tax compliance meet. A tax lawyer becomes especially useful when unfiled personal and corporate returns overlap.
If a CRA notice is sitting on your desk, call us at +1 647-977-7749 or arrange a confidential consultation. Remote meetings are available anywhere in Ontario.
Key Takeaways
- The CRA can assess tax for a year you never filed, and that assessment carries its own deadlines.
- Filing accurate returns fixes the numbers, while a timely objection preserves your right to dispute them.
- Late-filing penalties and compound daily interest grow every month, and outstanding returns can derail a business sale.
What Does Your CRA Notice Mean?
A CRA notice is the agency's formal record of the tax it says you owe or are owed for a specific tax year. Each type of notice shows how that figure was reached, and each one starts its own clock. The headings near the top of the page tell you which type you received.
How Does a Notice of Assessment Differ from a Reassessment?
A notice of assessment is the CRA's first determination for a tax year. It is issued after you file a return, or after the CRA assesses a year you did not file.
A notice of reassessment (NOR) changes an earlier assessment. That change can follow a CRA review, an adjustment you requested, a resolved objection, or a return you filed late for a year the CRA had already estimated.
The difference has practical consequences:
Feature | Notice of Assessment | Notice of Reassessment |
|---|---|---|
When issued | First determination for the year | Any later change |
Starts the normal reassessment period | Yes | No |
Starts a new objection window | Yes | Yes |
Shows a refund or balance owing | Yes | Yes, as revised |
The date of the original assessment controls how long the CRA can keep revisiting the year. Each reassessment opens a fresh window for objecting to the revised figures.
Why Can the CRA Assess Tax Before You File a Return?
Under subsection 152(7) of the Income Tax Act, the CRA can assess the tax owing when you were required to file and did not. The Non-Filer Program (NFP) uses information already available to it, such as T4 and T5 slips, prior-year business results, and third-party reporting.
These estimates are almost always too high. The CRA does not include voluntary deductions you may have been eligible for, including RRSP contributions, childcare expenses, and carrying charges, because it lacks the facts to support them. For business income, it estimates average expenses using your earlier filings as a guide.
The estimate is enforceable. The CRA can collect on it, charge interest on it, and add late-filing penalties calculated from it.
How Do You Read the Explanation of Changes and Account Summary?
The explanation of changes lists every line the CRA adjusted and the reason for each adjustment. Compare each line against your own records. Look for income reported twice, business expenses calculated from an unusual year, and deductions left out.
The account summary shows the resulting refund or balance owing, with assessed penalties and interest shown separately. Check three things on it:
- The notice date, which controls your objection deadline
- Whether penalties were charged as first-time or repeat late-filing penalties
- Whether amounts from other years or other CRA accounts were offset against this one
Keep the original notice. You will need its date and tax year for any objection or adjustment request.
How Do You Bring Missing Returns Up to Date?
Bringing missing returns up to date starts with an inventory of every outstanding personal, corporate, and GST/HST obligation. Accurate returns follow, and then you choose whether a voluntary disclosure suits your position. The order of these steps affects the relief you can get.
Gather Records and Identify Outstanding Personal and Corporate Returns
Start in your CRA account. My Account for individuals and My Business Account for corporations show which years have been assessed, which remain outstanding, and which slips the CRA has on file. Authorized representatives can view the same information through Represent a Client.
Then build a list for each taxpayer involved:
- Personal (T1): employment slips, investment slips, rental records, and self-employment income
- Corporate (T2): financial statements, general ledger, shareholder loan balances, and dividends paid
- GST/HST: sales records, input tax credit support, and filing frequency
- Payroll: source deductions withheld and remitted, and T4 slips issued
Owner-managed businesses often have gaps on both sides. Unfiled T2 returns can mean unreported dividends or salary on the owner's T1. If your structure includes holding companies, list each entity on its own, because every corporation carries its own filing obligation.
File Accurate Returns Even If the CRA Has Already Estimated Your Tax
File a complete, accurate return for every year the CRA estimated. When you file for a year already assessed under subsection 152(7), the CRA reviews the return, checks the income and deductions you reported, and issues a notice of reassessment.
Accuracy carries more weight here than speed. A tax professional should reconcile your return to the CRA's slip data before you submit it. Mismatches lead to further review and slower processing.
Once a return has been assessed, the CRA processes most online change requests through "Change my return" or ReFILE in about two weeks. Mailed requests take considerably longer. For corporate years, keep a copy of every supporting schedule, since the CRA will compare your T2 against its estimate.
When Should You Consider the Voluntary Disclosures Program?
The Voluntary Disclosures Program (VDP) is worth considering when returns are at least one year overdue, tax is owing, and no audit or investigation has begun on the matter. Changes that took effect on October 1, 2025 widened eligibility and set two tiers of relief:
- General relief (normally for unprompted applications): 75% relief of interest and 100% relief of penalties
- Partial relief (normally for applications prompted by CRA communications, such as an education letter): 25% relief of interest and up to 100% relief of penalties
An application must include the estimated tax owing or a request for a payment arrangement, along with full documentation. For multi-year problems, that means the most recent six years for Canadian-sourced income, ten years for foreign-sourced income, and four years for GST/HST.
The VDP does not cover penalties and interest that have already been assessed, and it does not apply to returns that produce a refund. If the CRA has already estimated a year, the remaining relief may be narrower. An anonymous pre-disclosure discussion with the CRA can help you weigh this before you reveal your identity.
How Do You Correct or Challenge a Reassessment?
You correct a reassessment by filing accurate returns or requesting an adjustment. You challenge it by filing a notice of objection before the deadline. Both routes can run together, and missing the objection window is the mistake that is hardest to undo.
Should You Request an Adjustment or File a Formal Objection?
An adjustment request works well for simple corrections on a return you filed, such as a missed slip or an overlooked deduction. A formal objection is the legal mechanism for disputing tax, interest, or penalties the CRA has assessed or reassessed.
File an objection online through My Account, My Business Account, or Represent a Client using "Register my formal dispute." You can also mail Form T400A, Notice of Objection under the Income Tax Act, to your Appeals Intake Centre. Include:
- The notice date and tax year
- The facts and reasons for your disagreement
- Copies of supporting documents
- Your representative's details, if you have one
Each disputed assessment needs its own objection. If the CRA reassesses a year while your objection is pending, the original objection is cancelled and you must object to the new reassessment.
An objection reviewed by an appeals officer can lead to a revised reassessment or a confirmation. A confirmation can then be appealed to the Tax Court of Canada within 90 days.
What Objection Deadlines Apply to Individuals and Corporations?
The deadlines differ by taxpayer:
Taxpayer | Objection deadline |
|---|---|
Individuals (other than trusts) and graduated rate estates | The later of one year after the filing deadline for the return, or 90 days from the notice date |
Corporations | 90 days from the notice date |
For an unfiled year, the one-year alternative may already have passed, which leaves only the 90-day window. If you miss the deadline because circumstances beyond your control intervened, or because you were trying to resolve the issue with the assessing office, you can request an extension. The request must be made no later than one year after the original deadline.
Large corporations (taxable capital in Canada over $10 million with related corporations) must pay 50% of the disputed amount when objecting. For other taxpayers, collection on most disputed income tax is normally postponed, but interest continues to accrue.
How Long Does the CRA Have to Reassess a Tax Year?
The normal reassessment period runs three years from the original notice of assessment for individuals and Canadian-controlled private corporations, and four years for other corporations. Certain matters extend it by three years, including loss carrybacks and some non-resident transactions.
The CRA can reassess at any time when there was a misrepresentation caused by neglect, carelessness, wilful default, or fraud, or when you signed a waiver. Because the period starts from an original assessment, a year with no filed return and no assessment has no limitation clock running at all. A tax lawyer can tell you which years are statute-barred and which remain open before you decide how much to disclose.
What Financial and Business Risks Need Attention?
The largest risks come from penalties and interest that grow every month, benefits that stop while returns are missing, and liabilities that surface during a buyer's due diligence. Each of these has a fix, and each fix costs more the longer it waits.
How Do Late-Filing Penalties and Interest Accumulate?
A personal late filing penalty applies when you file late and owe tax:
- First offence: 5% of the balance owing, plus 1% for each full month late, up to 12 months
- Repeat offence: 10% of the balance owing, plus 2% per full month, up to 20 months, if you were penalized in any of the three prior years and received a demand to file
On top of that, the CRA charges compound daily interest starting the day after the due date, including on amounts from reassessments. Interest also applies to the penalties. Rates are reset quarterly.
On a $20,000 balance filed 12 months late, the first-offence penalty alone is $3,400 before any interest is added. You can ask the CRA to cancel or waive interest and penalties when circumstances beyond your control prevented compliance. Requests reach back 10 calendar years.
What If You Cannot Pay, Expect a Refund, or Have Missing Benefits?
If you cannot pay the balance owing, file anyway, then contact CRA Collections about a payment arrangement. Filing stops the monthly penalty from growing, and partial payments reduce the interest.
If you expect a tax refund, there is no late-filing penalty, but timing still counts. A refund of overpaid tax depends on filing within the time the Income Tax Act allows. Individuals can request refunds for statute-barred years within a 10-year window.
The Canada Child Benefit stops when you or your spouse fail to file. After the overdue returns are assessed, the CRA determines your entitlement and pays any missed amounts retroactively with the next scheduled payment.
How Can Outstanding Returns Affect GST/HST Compliance and a Business Sale?
GST/HST carries its own penalties: 1% of the amount owing plus 0.25% of the amount owing for each complete month late, up to 12 months. A $250 penalty applies for ignoring a demand to file. Collection on disputed GST/HST and on unremitted payroll deductions is not postponed during an appeal, so these debts move quickly.
In a sale, unfiled returns become negotiating leverage for the buyer. Share buyers take on the company's historical liabilities. When diligence uncovers non-filing, buyers commonly ask for price reductions, larger escrows, specific indemnities, or a voluntary disclosure completed before closing. Our tax planning for business sales starts with clean compliance for this reason.
Outstanding filings can also complicate eligibility for the lifetime capital gains exemption and pre-sale steps such as a Section 85 rollover. Those steps rely on accurate corporate and tax records.
Protect Your Deadlines and Coordinate Your Next Steps
Your first priority is the objection deadline printed on your CRA notice of reassessment. Your second is accurate filing for every year with unfiled tax returns. Mark the notice date, count 90 days, and treat that date as fixed unless an individual's one-year alternative clearly applies.
From there, coordinate the work in a sensible order:
- Inventory every outstanding T1, T2, GST/HST, and payroll filing across each entity.
- Assess VDP eligibility before contacting the CRA about years it has not yet flagged.
- Prepare accurate returns with a tax professional who reconciles them to CRA slip data.
- File objections where the estimated assessment is wrong and the deadline is close.
- Address payment through a payment arrangement or a relief request.
Business owners face extra steps. Corporate non-filing can affect shareholder loans, dividends, and any planned tax-driven reorganization, so the cleanup should match your longer-term structure. When you are buying or selling a business, resolve compliance gaps before a letter of intent is signed.
We work alongside your accountant so that the returns, objections, and corporate records tell a single consistent story. That integrated tax and legal strategy is how we approach CRA matters for Ontario owners. Call +1 647-977-7749, Monday to Friday, 8:00 AM to 5:00 PM.
Frequently Asked Questions
Can I receive a CRA assessment if I have never filed a tax return?
Yes. Under subsection 152(7) of the Income Tax Act, the CRA can issue a tax assessment for any year you were required to file, using slips and other information it already holds. That assessment excludes voluntary deductions and is fully enforceable.
Does filing an overdue return replace the need to object to an estimated assessment?
Not always. Filing leads the CRA to review your return and reassess, but that process does not preserve your rights if the review stalls or the result is still wrong. Filing a notice of objection before the deadline protects your position while the return is processed.
Can I use the Voluntary Disclosures Program after the CRA contacts me?
Sometimes. Since October 1, 2025, applications prompted by CRA communications such as education letters can qualify for partial relief, but anyone already under audit or investigation on the matter is not eligible. Relief does not extend to penalties and interest that have already been assessed.
Does having unfiled tax returns automatically mean tax evasion?
No. Tax evasion involves intentional conduct, such as falsifying records or hiding income to avoid the law. Persistent non-filing after CRA demands can still lead to prosecution, which is why responding early is important.
Can I recover missed Canada Child Benefit payments after filing old returns?
Yes, if you were eligible. Once your overdue returns, and your spouse's if applicable, are assessed, the CRA recalculates your entitlement.
It pays missed Canada Child Benefit amounts retroactively on the next scheduled payment date.