How do milestone payments work in export of services contracts?

Milestone billing breaks a large project into stages, each with a deliverable and a payment. Milestone billing is common for software builds, app development, research reports, architectural work, video production and multi-phase marketing campaigns. For the exporter, milestones cap the amount at risk at any one time. For the client, milestones tie payment to visible progress.

Indian rules do not prescribe how milestones are set. They decide when each milestone must be invoiced for GST, and how long each invoice has to be paid under foreign exchange rules.¹² This guide explains both, as of October 2026, without giving legal advice on contract drafting.

What is a milestone payment in an export of services contract?

A milestone payment is a payment tied to a defined stage of the work, invoiced separately, so each milestone has its own realisation deadline.³ A milestone schedule lists each stage, what "complete" means, the amount and the payment term.

For example, a Bengaluru studio building a mobile app for a Canadian client might use the schedule below (illustrative, with made-up figures).³

Each payment term in this example sits well inside the nine-month realisation period that applies to each invoice.³ The completion evidence column matters most: a milestone defined as "client satisfaction" invites disputes, while "client approves in writing within 5 working days, or the milestone is deemed accepted" gives a clear trigger.

Who do the milestone invoicing rules apply to?

The milestone invoicing rules apply to registered suppliers billing foreign clients in stages, and the realisation rules apply to every exporter of services.¹²

The GST rules decide when to invoice; the FEMA rules decide how long each invoice has to be paid.¹²

How do you invoice a milestone under GST?

You invoice a milestone on or before its completion where the contract is a continuous supply of services with payment tied to that event, and otherwise within 30 days from the date of supply.¹⁴

1. Confirm the milestone is complete against the evidence agreed in the contract.
2. Work out the invoice date. Where a contract for more than three months has periodic payment obligations, it is a "continuous supply of services" under section 2(33) of the CGST Act, and section 31(5)(c) says the invoice is issued on or before the date the event is completed.¹ For shorter contracts, rule 47 requires the invoice within 30 days from the date of supply.⁴
3. Raise the invoice with the rule 46 particulars and, for exports under a Letter of Undertaking (LUT), the export endorsement.⁴⁵ See the export invoice format or use the export invoice generator.
4. Note the realisation deadline: nine months from the invoice date, or twelve months for rupee invoices.³
5. File the Export Declaration Form (EDF), covered below.²

Invoice when the milestone is genuinely complete and payable, because the invoice starts its own clock.³

What deadlines apply to milestone invoices?

Four deadlines apply to each milestone invoice: the GST invoice date, the FEMA realisation period, the rule 96A period under an LUT, and the EDF.¹²³⁵

From 1 October 2026, regulation 5 of the Foreign Exchange Management (Export and Import of Goods and Services) Regulations, 2026 (the 2026 Regulations) sets the nine-month realisation period.²³ Exporters of non-software services may instead file the EDF on or before the date payment is received.² On a milestone project, that usually means one EDF for each month in which a milestone was invoiced. See EDF for service exporters.

What happens if a milestone invoice stays unpaid?

If a milestone invoice stays unpaid under an LUT, rule 96A(1)(b) of the CGST Rules requires you to pay the integrated tax with interest within 15 days after the deadline.⁵ The deadline is one year from the invoice date, or the period allowed under FEMA including any RBI-permitted extension if that is later, or a further period the Commissioner allows.⁵

• Earlier milestones: a late final milestone does not affect earlier invoices that were paid on time.³
• Early invoices: an invoice raised before the client is ready to pay starts its clock early.³

This is another reason not to invoice milestones ahead of acceptance. See what to do when a foreign client is not paying.

How do mobilisation advances and retentions work in milestone contracts?

A mobilisation advance is a payment before work starts, and regulation 10 of the 2026 Regulations requires the advance and the realisation to be routed through the same authorised dealer (AD) bank, unless the change is intimated to both banks.² See advance payment against exports.

• Retention: the client holds back part of each payment until a warranty period ends. Retentions are risky for exporters because the held-back amount still belongs to an invoice whose nine-month clock is running.³
• Separate retention invoice: one way to handle a retention is to invoice the retention amount separately when it falls due, as in the "warranty close" row above, rather than including it in earlier invoices.

Discuss the approach with your bank and a chartered accountant.

How do scope changes affect milestone invoices?

Scope changes are best handled with a written change order that adds, removes or re-prices milestones before the work is done. If an already-invoiced milestone is later reduced, the realised amount will be lower than the invoice.²

• Reduction in export value: your AD bank can allow a reduction under regulation 6, and for invoices up to ₹10 lakh or equivalent, a declaration from you may suffice.²
• GST: a credit note may be needed.

See reduction in export invoice value and credit notes on export invoices.

What are the common mistakes with milestone payments?

The common mistakes with milestone payments are vague acceptance terms and invoices raised before the work is accepted.³⁵

• Vague acceptance criteria: these lead to disputes over whether a milestone is complete.
• Front-loading invoices: raising invoices before milestones are accepted starts realisation and LUT clocks early.³⁵
• Large final milestones: these leave most of the fee at risk at the end.
• Unrecorded scope changes: invoices and payments drift apart.
• No pause right: without one in the contract, work continues while invoices go unpaid.

For payment-term options beyond milestones, see export payment terms and payment terms in freelance contracts.