商业法律

商业发票未付款:催收前应准备什么

Reconcile the debt, objections and delivery records before a trade-debt demand.

Prepared by Patinya Wongwitit 律师事务所Updated
商业法律

The short answer

Establish what was agreed, what was delivered and which condition made payment due. An invoice belongs in a wider file with orders, acceptance and communications, distinguishing overdue debt from genuinely disputed amounts.

Create a traceable debt schedule

Record each invoice, delivery date, due date, amount paid and balance. Show credit notes, retention and deductions separately so the total can be traced.

Understand the stated reason for non-payment

Preserve reasons given: incomplete work, quality complaints, missing documents or a request for more time. Each requires different evidence. Proof that an invoice was sent may not answer a delivery dispute.

Base a demand on the actual agreement

Before a demand, check the counterparty, contractual address, payment terms, notice requirements and supported balance. Do not add a criminal allegation merely to pressure payment without assessing its basis.

Read chats with the other records

Decision 1112/2566 concerns a loan, not an invoice. It illustrates why digital messages do not automatically establish the nature of a payment. For trade debts, connect communications with the agreement, delivery and relevant dates.

Bring your commercial priorities

Explain whether speed, preserving the relationship, stopping further work or assessing litigation is your priority. Review the documents and consequences before a discount or replacement arrangement.

  • Agreement, orders and acceptance
  • Invoices and payment reconciliation
  • Objections and responses
  • Counterparty details and approaching dates

Common questions

Is an invoice enough?

It depends on the dispute and supporting evidence.

Should I repeatedly message a silent customer?

Use a documented communication process consistent with the agreement.

What should I record for part payment?

Date, amount, allocation and any actual agreed conditions.

Patinya Wongwitit 律师事务所

Office principal: Patinya Wongwitit
Thai Barrister-at-Law · Industrial-engineering background

Background and qualifications

General information, not advice for a specific matter. Your facts and applicable law may differ. Check the actual documents and deadlines before acting.

Have your own matter reviewed

Read the relevant service scope

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