The client did not pay: how to collect a business debt without wasting time or evidence

Money sitting in unpaid receivables? See how we handle business debt recovery in São Paulo — from protest to enforcement.

Few things erode a company's cash flow like a client who received the service and did not pay. You delivered, issued the invoice, did your part — and the bill turned into silence. Each month that passes, two losses grow together: the money tied up and the risk that the evidence goes cold.

The costliest mistake at this point is not collecting late. It is collecting the wrong way: calling, threatening, waiting “a little longer,” and letting time pass without recording anything — until the debt becomes hard to prove or close to being time-barred. Good business collection is technical: it chooses the right instrument for the evidence you have and acts before the debtor empties out their assets.

This article shows the paths to recover the credit — from the fastest to the most robust — and how to preserve the evidence from the first late payment. The cost of inaction is twofold: money tied up and a right that weakens over time.

What the law says: do you have an enforceable instrument or just evidence?

It all starts with a simple classification: is what you have in hand an enforceable instrument or merely evidence of a debt? The answer determines the path — and the speed.

Extrajudicial enforceable instruments include a contract signed by the debtor and two witnesses, checks, promissory notes and trade bills (duplicatas) that meet their specific requirements (CPC art. 784). The obligation must be certain, liquidated and enforceable (art. 783). For electronic instruments, art. 784 § 4 permits witnesses to be dispensed with where integrity is verified by a signature provider. Such an instrument allows enforcement without a prior ordinary action, but the creditor must still establish the requirements of the debt and its own performance where necessary.

Without such an instrument — but with written evidence that lacks enforceability, such as emails, an invoice, the order, and message exchanges — the path is the monitory action (art. 700 of the CPC), which turns that evidence into an enforceable instrument if the debtor neither pays nor successfully objects.

The purpose of the distinction is to select the appropriate route. Timing and attachment also depend on defences, court orders and available assets.

What are the paths to collect, from the fastest to the most complete?

Business collection offers alternative or combined measures, not a mandatory sequence that should delay urgent action or assessment of limitation periods:

• a) Out-of-court notice. A formal written demand documents communication and may open settlement discussions. Its effect on default depends on the obligation: failure to perform a positive, liquidated obligation on its fixed due date already places the debtor in default (Civil Code art. 397). A simple demand does not automatically interrupt limitation.
• b) Protest of the instrument or debt document. Carried out at a protest office under Law 9,492/1997, it requires assessment of the document, amount and enforceability. It may encourage negotiation but does not guarantee payment.
• c) Negative credit listing (Serasa/SPC). This requires an existing overdue debt and compliance with legal information and notification duties. An improper entry can give rise to liability.
• d) Monitory action. When there is written evidence but no enforceable instrument (art. 700 of the CPC).
• e) Enforcement of an extrajudicial instrument. This requires an instrument establishing a certain, liquidated and enforceable obligation (CPC arts. 783 and 784). Attachment follows the procedure and a court order; ordinarily the debtor is served to pay within three days (art. 829), without prejudice to legally available urgent measures.

In parallel, consider asset-preservation measures where statutory requirements and concrete evidence of risk are present. Neither interim relief nor enforcement guarantees sufficient assets to satisfy the debt.

When does the credit become time-barred?

The applicable limitation period depends on the debt, and missing it may bar the claim. A liquidated debt recorded in a public or private instrument is generally subject to five years (Civil Code art. 206 § 5 I). Other claims have specific periods and starting points.

The practical lesson is to check the deadline before waiting. Calls, emails and negotiations do not automatically interrupt limitation. The due date and legally recognised interrupting acts must be assessed.

A practical example: Marpel Serviços and the R$ 45,000 invoice

In this hypothetical example, Marpel Serviços Ltda. provides a R$ 45,000 service under a contract signed by both parties and two witnesses, with an invoice and emails confirming performance. The client falls behind and stops responding.

If the contract establishes a certain, liquidated and enforceable obligation, it may be an enforceable instrument. The company could consider notice and protest where appropriate, or bring enforcement proceedings and request attachment, subject to a court order and available assets. Without witnesses, the electronic-instrument exception and other statutory categories must be checked; where there is no enforceable instrument, written evidence may support monitory proceedings. This illustration does not describe a real client, an actual attachment or a guaranteed outcome.

The most common (and costly) mistakes

• Collecting only by phone, without recording anything in writing.
• Not issuing/keeping the contract, the invoice, and proof of delivery.
• Assuming a signature is sufficient without checking witnesses, the electronic-instrument exception or another statutory category.
• Waiting too long and letting the debt approach the limitation period.
• Granting discounts in the dark, without formalizing the agreement (which can also become an enforceable instrument).
• Not acting when there are signs that the debtor is disposing of assets.

Checklist: what to gather before collecting in court

• A contract signed by the debtor and, where required, two witnesses; for an electronic document, evidence of signature integrity.
• The invoice and proof of delivery/performance of the service.
• Emails, messages, and orders that confirm the engagement and the amount.
• Any payment slips, checks, or promissory notes that were issued.
• A history of the collection attempts and the debtor's responses (or silence).
• The debtor's details (CNPJ/CPF) and indications of assets for attachment.

Frequently asked questions about collecting a business debt

The client did not pay: what is the fastest way to collect?

It depends on the evidence, due date and debtor’s circumstances. An instrument establishing a certain, liquidated and enforceable obligation permits enforcement and a request for attachment, subject to court procedure. CPC art. 784 includes a private document signed by the debtor and two witnesses and an electronic-instrument exception in § 4. Written evidence without enforceable status may support monitory proceedings (art. 700). Notice and protest are options where appropriate, not guarantees of payment or reasons to delay checking limitation.

Can I enforce a contract signed by the client?

It may, if it establishes a certain, liquidated and enforceable obligation and falls within CPC art. 784. A private document signed by the debtor and two witnesses is one category; for electronic instruments, § 4 permits witnesses to be dispensed with where integrity is verified by a signature provider. Enforcement does not require a prior ordinary action, but the requirements of the obligation must still be established.

Can an unpaid invoice be collected in court?

Yes. An invoice alone is generally not an enforceable instrument, but may form part of the written evidence for monitory proceedings (CPC art. 700) or an ordinary collection action alongside the contract, order and proof of delivery or performance. A duplicata has its own requirements, including acceptance or, where applicable, protest and proof of delivery. Complete records strengthen the evidential basis without guaranteeing timing or outcome.

How long do I have to collect a business debt in São Paulo?

Limitation periods apply nationally and depend on the debt and document. A liquidated debt recorded in a public or private instrument is generally subject to five years (Civil Code art. 206 § 5 I); other claims have specific periods and starting points. Informal demands do not automatically interrupt limitation, so the due date and legally recognised interrupting acts must be checked.

When is it worth hiring a lawyer to collect from a client?

Seek advice when the amount is significant, the instrument or deadline is uncertain, performance is disputed or there is documented evidence of asset disposal. A lawyer can assess negotiation, protest, monitory or ordinary collection proceedings, enforcement and the requirements for interim relief. Advice may also help with smaller claims, but no route guarantees sufficient assets to pay the debt.

Good collection is the kind that acts early and with the right evidence

Recovering a debt involves method: organising evidence, selecting the appropriate route and acting before limitation help assess and protect the claim, without guaranteeing speed or recovery. Negotiation may be useful but should not delay assessment of deadlines and the debtor’s assets.

At Falchet e Marques Sociedade de Advogados, a firm in São Paulo (Av. Paulista), we structure business collections — from the notice to enforcement — and review contracts so that your credit is protected from the outset.

Talk to our team on WhatsApp: +55 11 95901-1854 — send us the contract, the invoice, the receipts, and the message exchanges so we can assess the best collection strategy.