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B 410AMandatory

Proof Of Claim, Attachment A

Federal · United States Courts · Effective December 1, 2023

This form is used to prove a claim for a debt that is secured by a mortgage on a person's main home. It asks for detailed information about the mortgage, the total debt, and a history of payments.

The court describes it as: This is an Official Bankruptcy Form. Official Bankruptcy Forms are approved by the Judicial Conference and must be used under Bankruptcy Rule 9009.

Open the official PDFfrom United States Courts

Where this fits in a case

Start a case

Stage: Start a case

This form must be used when filing a claim for a debt that is backed by a security interest in the debtor’s principal residence during bankruptcy proceedings.

Either party may file.

Official instructions

How-to guides published by the court for this form.

Common questions

What is this form for?
This form is an official document used to prove a claim for a debt that is secured by a mortgage on the debtor’s main home.
Do I need to use this form?
If you are filing a claim secured by a security interest in the debtor’s principal residence, you must use this form as an attachment to your proof of claim.

Revision history

No changes recorded since we started tracking this form on October 9, 2026. The current version took effect December 1, 2023.

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