Mobile banking apps make depositing cheques easy — and they make accidental double-deposits just as easy. The most common scenario: you deposit a cheque through your bank’s app, forget you did it, then deposit the physical cheque at an ATM or branch the next day. Here is exactly what happens and what to do.
How cheque clearing works in Canada
Since 2013, Canada uses an image-based cheque clearing system administered by Payments Canada. When you deposit a cheque — at a branch, ATM, or through mobile deposit — your bank captures an image and submits it to the clearing system electronically.
Each cheque image is processed within 1–3 business days. The clearing system has duplicate detection, but it is not instantaneous — which is why both deposits may initially appear as “pending” or even show as credited before the duplicate is flagged.
This is why you may see the money in your account briefly from both deposits before one is reversed.
What happens when a duplicate is detected
- Both deposits credited initially — depending on your bank’s hold policy, funds may appear in your account from both deposits
- Duplicate flagged — the clearing system or your bank’s internal controls identify the duplicate image, usually within 1–3 business days
- One deposit reversed — the bank reverses one of the deposits, typically the second one received chronologically
- Your account is debited — if you spent the duplicate funds, your account may go into overdraft
- Fee may be charged — a returned item fee ($5–$15 typical) may apply to the reversed deposit
The cheque issuer’s bank will also only honour the cheque once — the payer’s account is debited for the correct amount.
What to do right now
Step 1: Call your bank immediately
Do not wait for the bank to find it. Call the number on the back of your debit card or go to a branch and explain what happened.
Most banks treat first-time honest errors differently from deliberate fraud. Proactive contact:
- Stops them from treating it as suspicious activity
- May result in fee waivers
- Accelerates the reversal process so your balance is corrected faster
Step 2: Do not spend the duplicate funds
If your account shows a higher-than-expected balance, do not use it. Once the reversal comes through, spending the duplicate funds would leave your account overdrawn — triggering overdraft fees on top of any returned item fee.
Step 3: Mark the physical cheque
Write “MOBILE DEPOSITED — DO NOT DEPOSIT AGAIN” clearly across the face of the physical cheque. Keep it for at least 90 days in case the bank needs to review it.
Some banks request that you shred the physical cheque after a set period following a successful mobile deposit — check your bank’s mobile deposit terms.
If you deposited at two different banks
This happens when someone receives a cheque into an old and a new account, or transfers accounts between institutions. The scenario:
- You deposit the cheque at Bank A
- Bank A credits your account and submits the image to the clearing system
- You deposit the physical cheque at Bank B (days later)
- Bank B also submits the image
- The duplicate is detected — Bank B will receive a return and debit your account for the full amount
Contact both banks immediately. Explain what happened and ask each one to flag the account for the incoming reversal. Bank A’s deposit may stand as the valid one; Bank B will reverse.
Can this be treated as fraud?
Accidental double-depositing is a violation of the terms of your account agreement and Payments Canada rules, but honest mistakes are handled very differently from intentional cheque kiting. Intentional double-depositing — depositing the same cheque at multiple institutions knowing the duplicate will go through — is cheque fraud under the Criminal Code of Canada.
Your bank will consider context: first-time customer, proactive self-reporting, small amounts, and no pattern of similar behaviour. If you call before they catch it, the situation almost always stays in the “administrative error” category.
Common double-deposit scenarios
| Scenario | What happened | Fix |
|---|---|---|
| Mobile deposit + ATM deposit same cheque | App deposit forgotten | Call bank, mark physical cheque |
| Mobile deposit + branch deposit | Same cheque deposited days apart | Call bank before branch deposit clears |
| Old account + new account at different banks | Received cheque before switching banks | Contact both banks immediately |
| Cheque deposited, returned NSF, re-deposited — then original cheque also deposited again | Tracking confusion | Confirm with payer whether cheque was reissued or redeposited |
Preventing it going forward
- After mobile depositing a cheque, immediately write the date and “MOBILE DEP” on the face before setting it down
- Keep physical cheques in a separate envelope labelled “deposited — do not use” after mobile deposit
- Check your bank’s mobile deposit confirmation email/notification — most banks send one immediately
For other banking errors and how to resolve them, see what to do when an e-Transfer bounces and how to cancel a bank transfer in Canada.