What the Ontario Estate Administration Tax affidavit asks for — and how to autofill it with my-id.ca
Complete the Estate Administration Tax affidavit with less retyping
When an estate value changes after probate, an affidavit is needed for the tax adjustment — and it repeats the estate trustee's and deceased's identification details. This guide is an example of letting my-id.ca fill the repeating fields.
Official form and source
Start from the official source and always use the current version — form numbers and links can change:
- Service page: Apply for probate of an estate — ontario.ca
- Form (Central Forms Repository): Affidavit for Estate Administration Tax – Additional Payment/Refund — 004-3039
What this form is about
The affidavit adjusts the Estate Administration Tax when the estate value is revised after the original probate filing.
Before you start: what to gather
- Your name, address, and contact information as estate trustee.
- The deceased's name and relevant estate details.
- The revised estate value and the tax adjustment calculation.
Confirm the current process on ontario.ca and seek legal advice if needed.
How my-id.ca makes it faster
- Store the repeating details once. Save your and the deceased's identification details in my-id.ca.
- Autofill the identification fields. Use the my-id.ca Chrome extension on a web form, or fill a PDF from your saved details inside my-id.ca.
- Prepare the tax calculation yourself or with a lawyer.
- Review and file yourself with the court.
Why do it in my-id.ca
Estate paperwork repeats the same names and addresses across many documents. Stored once in my-id.ca — in Canada, with no third-party AI — the repeating fields fill themselves.
Frequently asked questions
- What is this affidavit for?
- It adjusts the Estate Administration Tax after the original probate filing when the estate value is revised upward or downward. It asks for the estate trustee's and deceased's details and the revised value. my-id.ca can autofill the repeating identification details.
- Can my-id.ca prepare the tax calculation?
- No. The estate value and tax calculation are yours (or your lawyer's) to prepare. my-id.ca only autofills the repeating identification fields.
- Where do I file it?
- With the Superior Court of Justice following the estates rules. Confirm the current process on ontario.ca and seek legal advice if needed.
Fill it once. Reuse it everywhere.
Save your information in my-id.ca once, then autofill this form and the next one — web forms with the Chrome extension, PDFs right in the app. Your data is stored in Canada and AI runs on my-id.ca's own servers, never sent to third-party AI providers.