- Under the Income Tax Act, the CRA normally has to reassess a tax year within a fixed window after your original Notice of Assessment — 3 years for individuals and Canadian-controlled…
- Audits, especially complex ones, sometimes take longer than the time remaining before the normal reassessment period expires.
- If the auditor genuinely needs more time to properly evaluate your position — including evidence and arguments favourable to you — a waiver can result in a better outcome than a rushed…
Partway through an audit, some Ontario taxpayers get an unexpected request: sign a waiver giving up the protection of the normal reassessment period for a specific tax year. It can feel like a trap — why would you ever agree to let the CRA take more time to reassess you? But the reasoning behind the request, and the calculation on whether to sign, is more nuanced than it first appears.
What the Waiver Actually Does
Under the Income Tax Act, the CRA normally has to reassess a tax year within a fixed window after your original Notice of Assessment — 3 years for individuals and Canadian-controlled private corporations, 4 years for other corporations and mutual fund trusts. Once that period expires, the year becomes statute-barred and generally closed to reassessment.
A waiver is a signed document that suspends this deadline for a specific tax year and specific matters described in it, giving the CRA more time to complete its review of that year without the normal reassessment period cutting the audit short. The waiver doesn't extend indefinitely or automatically — it applies to what it says, for as long as it remains in effect.
Why the CRA Asks for One
Audits, especially complex ones, sometimes take longer than the time remaining before the normal reassessment period expires. If the CRA is close to the deadline and hasn't finished its review, it faces a choice: reassess quickly based on incomplete information, or ask you to extend the deadline so the audit can be completed properly. The waiver request is usually the second option — and, from the CRA's perspective, it's often framed as being in everyone's interest, since a rushed reassessment based on partial information can be worse for you too.
The Case For Signing
- A more complete, considered review. If the auditor genuinely needs more time to properly evaluate your position — including evidence and arguments favourable to you — a waiver can result in a better outcome than a rushed reassessment against the deadline.
- Avoiding a reflexive worst-case reassessment. Facing an expiring deadline, an auditor under time pressure may issue a reassessment based on the CRA's most conservative reading of incomplete information, simply to beat the clock. A waiver removes that pressure.
- Room to negotiate or resolve issues before they harden into a formal reassessment and objection.
The Case Against Signing
- You give up a defence you'd otherwise get for free. If you do nothing and the deadline passes, the year becomes statute-barred on its own — no waiver needed, no negotiation required.
- A waiver can be broadly worded. If it covers more than the specific issue the CRA is actually still investigating, you may be extending exposure well beyond what's necessary.
- It's not free to revoke. A waiver generally has to be formally cancelled, and cancellation typically only takes effect after a further waiting period — it isn't something you can simply take back the moment you change your mind.
- It signals the audit may be more serious than a routine check, though this alone isn't a reason to refuse if the underlying issue is genuinely something worth resolving properly.
Questions to Ask Before Signing
- What specific tax year and issues does the waiver cover? A waiver limited to the exact matter under review is very different from one written broadly enough to reopen anything the CRA later finds.
- Why does the auditor need more time — and how much more? A vague request deserves a more skeptical response than one tied to a specific, identifiable gap in the audit.
- What happens if I decline? In many cases, declining simply means the CRA reassesses based on what it currently has, which starts the objection process on a timeline you can control — sometimes a reasonable trade-off compared to extending an open-ended audit.
- Have I gotten independent advice on the wording? The CRA drafts the waiver in its own interest; having a tax lawyer review or negotiate the wording protects yours.
A Practical Comparison
| Sign the waiver | Let the deadline pass | |
|---|---|---|
| Audit timeline | Extended for the covered issue | Ends when the normal reassessment period expires |
| Your certainty | Delayed — outcome still pending | Faster — the year becomes statute-barred (for issues not covered by a fraud or misrepresentation exception) |
| CRA's information | More complete before any reassessment | May be forced to reassess on what it currently has |
| Reversibility | Difficult — formal cancellation, delayed effect | N/A — no action needed |
Frequently asked questions
Am I required to sign a waiver if the CRA asks?
No. Signing is voluntary. Declining doesn't stop an ongoing audit, but it does mean the CRA's ability to reassess that year is bounded by whatever time remains in the normal reassessment period.
Does signing a waiver mean I'm admitting I owe more tax?
No. A waiver is procedural — it extends the CRA's time to complete its review. It isn't an admission about the substance of the audit or an agreement to any specific reassessment amount.
Can I limit what a waiver covers before signing it?
Often, yes, with the right advice — the wording of a waiver can sometimes be negotiated to cover only the specific issue genuinely still under review, rather than the broadest language the CRA initially proposes.
If I already signed a waiver and regret it, can I cancel it?
A signed waiver generally needs to be formally revoked, and revocation typically doesn't take effect immediately — there is usually a waiting period built in. Speak with a tax lawyer about your specific waiver's terms before assuming you can simply withdraw it.
This is a tax question
Start a file online — flat, published fees, reviewed by a licensed Ontario lawyer before a dollar is owed.