If your customer has filed for bankruptcy and you want to be paid — or at least to have any chance of being paid — there is one document you must file: a proof of claim. Filing a proof of claim is the formal act by which you assert your right to receive a distribution from the bankruptcy estate. It is essentially your ticket to participate in the creditor distribution process. Without it, the bankruptcy court and the trustee will simply not know that you are owed money, and even if funds are available for unsecured creditors, your share will not be set aside for you. The deadline for filing this document — called the bar date — is absolute in most cases. Miss it, and you may be permanently barred from receiving any distribution, regardless of how legitimate your claim is.

Many business owners who find themselves as creditors in a bankruptcy case assume that the system will automatically account for what they are owed, or that someone will reach out to them with instructions. That assumption is dangerous. While the bankruptcy court sends notices to creditors listed on the debtor’s schedules, those schedules may be incomplete, the address may be wrong, and the notice may arrive late or not at all. Relying on a notice from the court to prompt you into action is a gamble you should not take. This article walks you through the proof of claim process from beginning to end, including what it is, why it matters, when to file, how to file, and what to attach.

What Is a Proof of Claim?

A proof of claim is a written statement filed with the bankruptcy court by a creditor, asserting that the debtor owes the creditor money as of the date the bankruptcy petition was filed. The term ‘proof’ is important: the document is not just a statement that you think you are owed something. It is an assertion, made under penalty of perjury, that you have a valid claim of a specific amount, and it must be supported by documentation that substantiates the claim.

A proof of claim serves several functions. It puts the bankruptcy estate and the trustee on notice of your claim. It creates a presumptive right to receive a distribution if funds are available for creditors of your class. It establishes the amount and character of your claim for voting purposes in a Chapter 11 case, where creditors vote on whether to approve the debtor’s proposed plan of reorganization. And it triggers the objection process — either the trustee, the debtor, or another interested party may file an objection to your claim if they believe it is overstated, unsupported, or legally invalid.

The Bar Date: The Most Important Deadline in Your Case

The bar date is the court-ordered deadline by which proofs of claim must be filed. Claims filed after the bar date are generally disallowed unless the late filing can be excused as ‘excusable neglect’ under the applicable legal standard, which requires the creditor to demonstrate that the late filing was due to circumstances beyond their control, that they did not engage in bad faith, that no prejudice will result to the debtor or other creditors, and that the delay was not too long. Courts apply the excusable neglect standard inconsistently, and many late-filed claims are simply disallowed.

In Chapter 7 cases, the bar date is typically set by the court and stated in the notice of the bankruptcy filing that is mailed to creditors. In no-asset Chapter 7 cases — where there appear to be no assets available to distribute to unsecured creditors — the court may initially indicate that there is no need to file claims. However, if the trustee later discovers assets, a new bar date will be set and creditors will have an opportunity to file. In Chapter 11 cases, the bar date is also set by court order, and notice of the bar date must be provided to all known creditors. The bar date in Chapter 11 cases can be set relatively early — sometimes within 30 to 60 days of the filing in cases with a lot of pre-petition creditors. Importantly, the bar date can differ for different types of creditors: there may be a general bar date for most claims and a separate, often later, bar date for governmental units.

The lesson here is simple and important: do not wait for a notice telling you to file a proof of claim. As soon as you learn that your customer has filed for bankruptcy, take immediate steps to prepare your claim. You can always file early; you may not be able to file late.

The Official Proof of Claim Form: What You Are Working With

The proof of claim is filed on Official Form 410, which is available for free on the United States Courts website and is the same form used in every federal bankruptcy court in the country. The form is relatively straightforward — it is two pages plus instructions — but filling it out accurately and completely requires care. Filing an inaccurate proof of claim is not just a procedural error: it is an assertion made under penalty of perjury, and material misstatements can have serious consequences.

The form asks for your name and contact information, the debtor’s name and case number, the amount of the claim, the basis for the claim, whether the claim is secured or unsecured, whether any part of the claim is entitled to priority, and information about whether anyone else has filed a proof of claim for the same debt. It also requires you to attach supporting documentation and to sign under penalty of perjury that the information is accurate to the best of your knowledge.

Step-by-Step: Filling Out the Proof of Claim

The first section of Form 410 asks for identifying information. You will enter the name of the creditor — which is your business’s legal name, not a trade name or DBA unless those are the same thing — and the address where all notices and payments should be sent. If you are being represented by an attorney, enter the attorney’s information in the designated space. Pay careful attention to the name you use: the name on the proof of claim should match the name on your contracts and invoices, and it should match the name you want payments sent to. An incorrect name can complicate payment later.

The form will ask for the bankruptcy case number, which you can find on PACER or on any notice you have received from the court. The case number has a specific format that includes the court district and case number, and you should copy it exactly as it appears in court documents. Getting the case number wrong can result in your claim being filed in the wrong case or being unprocessable.

Next, you must state the amount of the claim. This is the total amount owed as of the date the bankruptcy petition was filed — not the amount owed today, and not a rounded estimate. You should calculate this carefully. If your customer owes you for specific invoices, add up those invoices. If interest or late charges have been accruing under your contract or under applicable law, you may include accrued interest up to the petition date. Do not include interest that accrued after the petition date, because in most cases post-petition interest on unsecured claims is not allowed. If you are asserting a claim for damages under a rejected executory contract, the calculation is more complex and requires legal advice.

The form asks whether the claim is wholly or partially secured by collateral. If you are a secured creditor, you should check the appropriate box, describe the collateral, and state both the amount of the secured claim and the amount of any unsecured deficiency. This is where your prior work identifying your creditor status pays off. If you check the wrong box here — for example, claiming to be unsecured when you actually have a perfected security interest, or claiming to be secured when your lien was not properly perfected — you could inadvertently waive rights or create confusion that requires litigation to untangle.

The form also asks whether all or part of the claim is entitled to priority under Section 507. For most trade creditors, the answer is no — their claims are general unsecured claims with no special priority. However, if your claim includes unpaid wages (if the debtor is also your employer), or if you have certain other qualifying claims, you should consult with an attorney before completing this section.

What Documents to Attach

The single most important thing you can do to ensure your claim is allowed is to attach clear, complete documentation. The Official Form instructs you to attach copies of any documents that support your claim, such as promissory notes, purchase orders, invoices, itemized statements of running accounts, contracts, court judgments, and mortgages. You should not attach originals — only copies. If the documentation is voluminous, you may attach a summary, but you should be prepared to produce the underlying documents if the trustee or other parties object and request them.

At a minimum, you should attach the following for a trade creditor claim: a summary or schedule of all outstanding invoices, with invoice numbers, dates, amounts, and payment due dates; copies of the most significant underlying invoices; the contract or purchase order that governs the relationship, if any; proof of delivery or shipment for goods delivered, such as delivery receipts or bills of lading; and a payment history showing when payments were received and when the account went into default. If your claim is secured, also attach a copy of the security agreement and evidence of perfection, such as a copy of the filed UCC-1 financing statement.

Courts and trustees review proofs of claim with varying levels of scrutiny. In asset cases with many creditors, the trustee may examine each claim carefully to identify overstatements or unsupported amounts. If your claim lacks adequate documentation, the trustee may object, which will require you to produce the underlying records or face having your claim reduced or disallowed. Coming to the filing with thorough documentation protects your claim from the outset.

How to File the Proof of Claim

Once you have completed Form 410 and assembled your supporting documentation, you need to file it with the bankruptcy court. There are several ways to do this. The most efficient method is electronic filing through the court’s Claims Agent or through the court’s Electronic Case Filing system. Large bankruptcy cases, particularly in Chapter 11, often have a claims agent appointed by the court — a specialized administrative firm that manages the claims process — and creditors in those cases typically file their proofs of claim through the claims agent’s online portal. The name and contact information of the claims agent, if one has been appointed, will be in the court’s notices.

If no claims agent has been appointed, you can file directly with the bankruptcy court by mailing your proof of claim to the clerk of the court or, in courts that permit it, filing electronically through PACER. Some courts also allow creditors who are not represented by an attorney to file claims electronically using a simplified portal. Check the court’s local rules and website for the specific filing instructions for the district where the case is pending, because procedures vary.

Whichever method you use, keep proof of filing. If you mail the claim, use certified mail with a return receipt and keep the receipt. If you file electronically, save or print the confirmation of filing. If your claim is later disputed or you need to demonstrate that you filed timely, you will need this evidence.

What Happens After You File

Once your proof of claim is filed, it is entered into the court’s claims register and assigned a claim number. In most cases, the trustee or claims agent will send you an acknowledgment of receipt. Your claim is then presumptively allowed, meaning it is treated as valid unless someone files an objection. An objection might be filed by the trustee, the debtor-in-possession in a Chapter 11 case, a committee of unsecured creditors, or another creditor. Objections are most common when the claim appears to be overstated, when documentation is missing, when the claim is for a disputed debt, or when the debtor believes the claim has already been satisfied.

If an objection is filed to your claim, you will receive notice and have an opportunity to respond. The objection process is adversarial and may require you to produce documentation, attend a hearing, or negotiate with the objecting party. An objection to a claim that lacks documentation is difficult to defend. An objection to a well-documented, accurately stated claim may be relatively easy to overcome. This is yet another reason why thorough documentation at the time of filing is so important.

Amending a Proof of Claim

If you file a proof of claim and later realize it contains an error — you understated the amount, left out a category of damages, or omitted important documentation — you may be able to file an amended proof of claim to correct the error. Courts generally permit amendments if they are filed before the bar date or if the amendment relates back to the original timely filed claim. However, amendments that assert new claims or dramatically increase the amount of the claim may be treated as new claims subject to the bar date, and courts have discretion to disallow amendments that unfairly prejudice other creditors or the estate. If you need to amend a filed claim, consult with a bankruptcy attorney first.

A Note on Claims Agents and Specialized Chapter 11 Procedures

Large Chapter 11 cases — think major retail bankruptcies, large manufacturing companies, or publicly traded businesses — often have dozens or hundreds of thousands of creditors. These cases typically have court-appointed claims agents who maintain the claims register and provide online filing portals. The claims agent will publish a dedicated website for the case with instructions for filing claims, forms, FAQs, and contact information. If your customer is a large company whose bankruptcy has received press coverage, search for the case name plus ‘claims agent’ or look at the court’s docket to identify the claims agent.

In large Chapter 11 cases, the debtor may also serve a bar date notice package — a formal mailing that includes the bar date notice, customized proof of claim forms pre-populated with the creditor’s information (called scheduled claim forms), and instructions. If you receive this mailing, pay careful attention to the instructions. In some cases, if your claim matches the amount listed in the debtor’s schedules and you agree with that amount, you may not need to file a separate proof of claim — the scheduled amount will be treated as your claim. However, if the scheduled amount is wrong, if your claim is listed as disputed or contingent, or if you want to assert a different amount, you must file a proof of claim.

The Bottom Line: File Early, File Accurately, File Completely

The proof of claim process is not complicated, but it is unforgiving of inattention. The bar date is a hard deadline that courts rarely excuse missing. The documentation requirement is real — a claim filed without supporting documents is vulnerable to objection. The accuracy requirement is enforced by the penalty of perjury that accompanies your signature on the form. And the consequences of getting it wrong — having your claim reduced, disallowed, or subordinated — directly affect how much you recover.

The best approach is to begin preparing your proof of claim as soon as you learn of the bankruptcy filing, to involve legal counsel if the amount is significant or the facts are complex, and to file as early as possible rather than waiting for the bar date to approach. Filing a proof of claim does not guarantee you will be paid — that depends on whether the bankruptcy estate has assets to distribute — but not filing a proof of claim almost certainly guarantees that you will not be paid. In the bankruptcy system, participation is not optional for creditors who want a recovery.