Form T183CORP Signature Requirement Checker
Form T183CORP needs an authorized signing officer, signed before transmission. Three answers show whether those conditions are met.
Written and reviewed by Sharad Gondaliya, CPA (Ontario), CPA Ontario Membership 61040184.
Last reviewed: October 29, 2026
Answer all three questions.
Gondaliya CPA Professional Corporation is a registered EFILE electronic filer. Returns are prepared and transmitted in Canada. Credentials are never shared and never used offshore.
What Form T183CORP Is For
Form T183CORP is the authorization that lets a return be transmitted electronically on a corporation’s behalf. It carries the figures on your own return, and signing it is how you confirm those figures before anything is sent.
It is always Form T183CORP. The name is never shortened on this site, because the shorter name belongs to a different authorization for a different return and the two are not interchangeable.
An Authorized Signing Officer, Not Just Anyone Involved
The form is signed by an authorized signing officer of the corporation. A bookkeeper, a spouse, a shareholder who is not an officer and the accountant preparing the return are none of them that, however closely they are involved.
The officer also has to have read the figures. The signature is a confirmation of the return’s contents, so signing without reading it is not the thing the form is asking for.
| Who it is | Can sign Form T183CORP |
|---|---|
| An authorized signing officer of the corporation | Yes |
| A shareholder who is not an officer | No |
| The bookkeeper | No |
| The accountant who prepared the return | No |
| A spouse or family member who is not an officer | No |
Before Transmission, and the Timestamp Proves It
The form is signed before the return is transmitted, not alongside it and not afterwards. It authorizes the transmission, so it has to exist first.
Here it is signed on a single-use access-controlled screen, and the date and the hour, minute and second are recorded on the server in Eastern Time. It is never backdated. The timestamp is written as you sign, which is what makes the sequence demonstrable rather than asserted. The nil T2 filing progress checker places the signature in the sequence either side of it.
The Firm Keeps It for Six Years and Does Not Send It
The signed form stays with Gondaliya CPA Professional Corporation for six years. It is not sent to the Canada Revenue Agency unless the Canada Revenue Agency asks for it.
That surprises people who expect the signature to travel with the return. It does not. The transmission carries the return; the form is the record of the signature that permitted it, held in case it is ever asked for. The guide to T183CORP signing and transmission sets out the whole sequence. The T183CORP retention calculator dates the end of that six-year period, and the multi-year signing requirement checker counts the forms a run of unfiled years needs.
Frequently Asked Questions
Who can sign Form T183CORP?
An authorized signing officer of the corporation. A bookkeeper, a non-officer shareholder or the accountant preparing the return cannot sign it in that officer’s place.
When is Form T183CORP signed?
Before the return is transmitted. It authorizes the transmission, so it has to exist first, and the timestamp recorded as you sign shows that it did.
Is Form T183CORP sent to CRA?
No, unless the Canada Revenue Agency asks for it. The transmission carries the return; the signed form is the record of the signature that permitted it.
How long is it kept?
Gondaliya CPA Professional Corporation keeps the signed form for six years.
Can the form be backdated?
No. The date and the hour, minute and second are written by the server in Eastern Time as you sign.
Nil T2 Filing, $300.00 plus HST per tax year
Type your corporation name, pick your unfiled years, pay, and sign Form T183CORP on a secure screen. Your CRA confirmation is emailed within 3 business days.
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