If you see this error while submitting your Alberta corporate tax return, it means the Alberta tax authority cannot find your corporate account number in their system.
Full error message:
“The Alberta Corporate Account Number does not exist on Tax and Revenue Administration's database. Please verify account number on AT1 Line 034.”
Why This Happens
This issue typically occurs when:
The Corporate Account Number entered does not match Alberta records
The number is typed incorrectly or incomplete
You are using the wrong identifier (e.g., Business Number instead of Corporate Account Number)
Your corporation is not yet registered or activated in Alberta’s system
The validation is done against records from Alberta Tax and Revenue Administration.
How to Fix It
Step 1: Locate the Correct Corporate Account Number
Find your Corporate Access Number / Corporate Account Number from:
Articles of Incorporation (Alberta)
Alberta corporate registration documents
Correspondence from Alberta Corporate Registry
Step 2: Verify the Number in Your Return
In CloudTax:
Open your corporate tax return
Go to the Alberta section (AT1)
Locate Line 034 (Corporate Account Number)
Re-enter the number exactly as shown on your official documents
Step 3: Save and Re-submit
Click Next to save your changes
Submit your return again
Common Mistakes to Avoid
Using your CRA Business Number (BN) instead of the Alberta Corporate Account Number
Entering incorrect formatting or extra spaces
Using outdated or incorrect registration details
Still Need Help?
If the error continues:
Confirm your corporation is registered with Alberta Tax and Revenue Administration
Contact Alberta authorities to verify your account number
Reach out to CloudTax support with your documents and error details