Legal Notice for Unpaid Invoice: Format for Indian Businesses

The work was delivered in March. The invoice was raised on 2 April, approved by the client's project manager, and logged in their portal. By July the payment status is still "under process", the finance contact has stopped replying, and the founder is being asked by her own team why salaries are late. Chasing politely has stopped working. A legal notice for unpaid invoice is the document that changes the tone of the conversation.

For a small business, an unpaid invoice is not an inconvenience; it is a cash-flow crisis with a named cause. The notice has to do more than threaten. It must fix the amount with interest, identify the correct legal entity, choose between the MSME recovery route, a summary suit and a criminal complaint, and be accurate enough to survive scrutiny in court. This guide covers the format, the statutory interest available to micro and small enterprises, the summary suit procedure, and the drafting errors that let debtors buy months of delay.

Legal notice for unpaid invoice: why it differs from a consumer complaint

This is a business-to-business claim, and the law treats it differently from a consumer dispute. There is no consumer commission route, because the buyer is using the goods or services for commercial purposes. The claim is a contractual debt, and the remedies are civil. The notice therefore has to be drafted as a demand for a liquidated sum, supported by the contract, the purchase order, the delivery proof and the invoice.

The second difference is the audience. A consumer notice is read by an individual; an invoice notice is read by a finance team, a legal counsel or a promoter who is deciding whether to pay now or litigate. The notice should be written for that reader: short, factual, with the documents attached and the consequence stated in business terms. An emotional letter is forwarded to the lawyer; a precise letter is forwarded to the accounts department with an instruction to pay.

The statutory framework for recovering business dues

Three routes matter. The first is the ordinary civil suit for recovery of money, filed in the court with jurisdiction over the amount. The second is the summary suit under Order XXXVII of the Code of Civil Procedure 1908, which applies to suits on bills of exchange, promissory notes, written contracts and liquidated demands. The third is the statutory mechanism for micro and small enterprises under the Micro, Small and Medium Enterprises Development Act 2006, which provides for interest on delayed payment and reference to the Micro and Small Enterprises Facilitation Council.

The MSMED Act route is the most powerful for eligible suppliers. Where a micro or small enterprise supplies goods or services to a buyer, the buyer must pay within the period agreed in the contract, subject to the statutory maximum, and where there is no agreement, within forty-five days of acceptance. Delay attracts compound interest at three times the bank rate notified by the Reserve Bank of India. The Facilitation Council conducts a conciliation and, if that fails, arbitrates the dispute. There is no court fee of the kind a civil suit attracts, and the process is faster than ordinary litigation.

Eligibility for the MSME route

Eligibility depends on registration and on the investment and turnover thresholds in the MSMED Act. A supplier that has obtained Udyam registration and falls within the micro or small category can invoke the Act. A medium enterprise or a large supplier cannot. The notice should state the Udyam registration number and the category, because the Facilitation Council will ask for it at the admission stage. Suppliers who are eligible but unregistered should complete registration before sending the notice, since it is a threshold requirement.

Summary suits and the leave to defend

Where the claim arises from a written contract or a liquidated demand, a summary suit under Order XXXVII CPC allows the plaintiff to obtain a decree quickly unless the defendant obtains leave to defend. The defendant must apply for leave within the prescribed time and show a triable issue. If leave is refused, the plaintiff gets a decree without a full trial. The notice should therefore state that a summary suit will be filed, because the threat of an early decree is often more persuasive than the threat of a long trial.

Essential contents of the notice

The notice should be on the supplier's advocate's letterhead and should be organised so that each invoice can be traced. A finance team that can verify every line is far more likely to release payment than one facing a lump-sum demand.

• Parties and contract. The supplier and buyer entities, the purchase order or contract date and number, and the scope of work or supply.
• Delivery proof. The date of delivery or completion, the signed delivery challan, the acceptance email or the project sign-off, with references.
• Invoice schedule. A table listing each invoice number, date, amount, due date and payment status, so that the total is verifiable.
• Payment terms and credit period. The clause in the contract or purchase order that fixes the due date, and the date on which each invoice became overdue.
• Reminders sent. Emails, calls and portal tickets with dates, showing that the supplier followed up before resorting to legal action.
• Interest computation. The contractual or statutory interest rate, the period, and the amount claimed, with the calculation shown.
• Set-off and disputes. A statement addressing any deduction or dispute the buyer has raised, with reasons why it is not payable.
• Demand and deadline. Payment of the principal and interest within fifteen days, with the bank details for remittance.
• Consequence. Reference to the MSME Facilitation Council, a summary suit, or a winding-up petition where the buyer is an insolvent company.
• Reservation of rights. A clause preserving the right to claim costs, to report the default to credit bureaus where applicable, and to pursue any other remedy.

Enclosures should include the purchase order, the signed contract, delivery challans, the acceptance email, all invoices, the payment ledger and the reminder correspondence. The ledger is the single most important annexure; without it, the buyer can dispute the arithmetic and delay for weeks.

Interest, set-off and the real cost of delay

Interest is where the notice earns its keep. A supplier who claims only the principal recovers only the principal, years later, with no compensation for the financing cost of the delay. The notice should claim interest from the due date of each invoice, at the contractual rate if the contract provides one, or at the statutory rate where the MSMED Act applies, or at a reasonable commercial rate where neither applies.

Set-off is the buyer's usual counter. A buyer who owes a lakh will claim a deduction for "late delivery", "quality issues" or "pending work". Some deductions are legitimate; many are invented after the invoice becomes due. The notice should require the buyer to substantiate each deduction with documents and should state that unsubstantiated deductions will be treated as an admission of the balance due.

Stamp duty, service and limitation

Stamp duty on the notice varies by state and is generally nominal. The current requirement should be confirmed with the sub-registrar or the local bar. Registration is not required. Service should be by registered post with acknowledgement due and by speed post to the buyer's registered office as recorded in the Ministry of Corporate Affairs records, and by email to the finance and legal contacts. Where the buyer is a partnership or proprietorship, serve the partners or the proprietor at their known addresses.

Limitation for a money claim is three years from the date the debt became due. For an invoice payable within thirty days of the invoice date, the clock starts on the day after the credit period expires. Each invoice has its own limitation clock. A supplier who waits two years and eight months loses the earliest invoices even though the total claim looks live. The notice should be sent within ninety days of the first overdue invoice, before the debt ages.

Common mistakes in invoice recovery notices

The first is naming the wrong entity. A purchase order issued by a subsidiary cannot be enforced against the parent, and a notice served on the parent will be returned with a denial. Check the purchase order, the invoice addressee, the GST registration and the bank account name; they should all point to the same legal entity. The second is failing to prove delivery. An invoice alone does not establish that the goods were supplied or the service performed. The delivery challan, the acceptance email or the signed completion certificate is essential.

The third is claiming interest without a basis. A round figure described as "interest and damages" is easily disputed. The fourth is ignoring a partial payment. If the buyer paid part of the invoice, the notice must credit it and claim the balance. The fifth is using a criminal complaint as a threat in a pure contractual dispute. Non-payment of an invoice is a civil wrong; calling it cheating invites a reply that damages the supplier's credibility. Criminal action is appropriate only where there is evidence of dishonest intention from the outset, such as a buyer who placed orders knowing it would not pay.

Escalation if the invoice remains unpaid

If the deadline passes without payment or a documented dispute, the next step depends on eligibility. An MSME supplier should file a reference before the Facilitation Council, which is faster and cheaper than a suit. Other suppliers should file a summary suit where the contract supports it, or an ordinary suit where the claim involves disputed facts that require trial. Where the buyer is a company that is insolvent or has stopped paying its debts, a petition under the Insolvency and Bankruptcy Code 2016 may be available, and the notice should be sent before the company's assets are dissipated.

Where the buyer has issued a cheque that was dishonoured, a separate notice under Section 138 of the Negotiable Instruments Act 1881 must be sent within thirty days of receiving the bank's return memo, giving the drawer fifteen days to pay. The invoice notice and the cheque notice are different documents with different timelines, and mixing them up is a frequent error. If both apply, send them as separate letters on the same day.

Frequently asked questions

Is a legal notice mandatory before filing a recovery suit?

It is not a statutory precondition for every suit, but it is standard practice and often required by the contract. Many purchase orders contain a clause requiring notice and a cure period before litigation. Sending the notice also fixes the date from which interest is claimed and gives the debtor a final chance to settle without a court case.

What interest can an MSME supplier claim on a delayed payment?

Under the MSMED Act 2006, a supplier can claim compound interest at three times the bank rate notified by the Reserve Bank of India where payment is delayed beyond the agreed period or forty-five days. The notice should state the Udyam registration number, the invoice dates and the computation. The Facilitation Council can award the interest along with the principal.

What is a summary suit and when can I use it?

A summary suit under Order XXXVII of the Code of Civil Procedure 1908 is available where the claim arises from a written contract, a bill of exchange, a promissory note or a liquidated demand. The defendant must apply for leave to defend within the prescribed time and show a triable issue. If leave is refused, the court passes a decree without a full trial, which makes it a fast route for clear invoice claims.

Can I file a criminal complaint for an unpaid invoice?

Only where there is evidence of dishonest intention from the beginning, such as a buyer who placed orders without any intention to pay. Ordinary non-payment is a civil dispute. A criminal complaint filed to pressure a debtor can be quashed and may expose the supplier to a claim for malicious prosecution. The notice should keep the civil remedy primary.

What is the limitation period for recovering an unpaid invoice?

Three years from the date the amount became due under the contract. Each invoice has its own limitation period, so the earliest invoices expire first even if later ones are still live. A written acknowledgment of the debt signed by the debtor can extend the period, which is one reason to obtain a balance confirmation during the follow-up.

What if the buyer has raised a quality dispute after the invoice fell due?

The notice should require the buyer to substantiate the dispute with inspection reports, rejection notes and correspondence from the time of delivery. A dispute raised months after acceptance, with no contemporaneous record, is weak. If the dispute is genuine, the notice should claim the undisputed balance and reserve the right to claim the rest.

Drafting Support

Our drafting team prepares invoice recovery notices with the invoice ledger, the interest computation and the correct forum identified, so the claim is ready for a Facilitation Council or a summary suit.