If you discover that you made an error in remitting your deductions during the year, you should proceed as follows:
Remit any shortage as soon as possible using My Payment or a remittance form.
If you do not have a remittance form:
If your remittance is late, we may apply a late remitting penalty.
If you over-remitted in 2012, reduce your next remittance by the amount of the overpayment.
If you over-remitted in 2011, attach a detailed note to your T4 summary indicating the reason for the overpayment and whether you want us to transfer this amount to another account or another year, or refund the overpayment to you.
If you have misapplied a payment, you can use My Business Account to transfer payments within your various accounts or call 1-800-959-5525.
After we have received your information return, we do a Pensionable and Insurable Earnings Review (PIER) to verify that you have remitted the right amount of CPP and EI. To find out what happens when there is a discrepancy, see Pensionable and Insurable Earnings Review (PIER).
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