Engineering design firms that bill overseas clients — EPC contractors, manufacturers, consultants — file a monthly EDF listing every export invoice raised that month, due 30 days from the end of the invoice month. The details that trip engineering firms up are specific to the trade: timesheet-based invoices, occasional engineers on site abroad, and long payment cycles that press against the 9-month realisation window.
Key takeaways
- Drawings, models and calculations sent electronically are delivered over the Internet (field 1.4); work done mainly on a client's site abroad may call for "Others".
- Inward remittances for engineering services often carry purpose code P1009 (architectural, engineering and other technical services) — the bank confirms the code.
- Engineering services have their own SAC headings; confirm the exact six-digit code with your CA instead of borrowing an IT code.
- Large EPC clients pay slowly. Watch the 9-month window per invoice and ask your AD bank for an extension early if needed.
What engineering export work looks like on paper
An Indian engineering design firm typically does one or more of these for overseas clients: detailed engineering (piping, structural, electrical, instrumentation), CAD drafting and 3D modelling, design review and value engineering, product design for manufacturers, and documentation such as as-built drawings. The work happens in India and is sent as files. Occasionally an engineer travels to the client's site for a survey, a hazard review or commissioning support.
That pattern translates directly into the EDF.
| EDF field | Usual entry for an engineering design firm |
|---|---|
| 1.1 Type of export | Services |
| 1.4 Mode of delivery | Internet for office-based work; Others where the service is mainly delivered on site abroad |
| 1.5 Category of exporter | Others, unless you are an SEZ unit or 100% EOU |
| 1.12 Mode of realisation | Others for bank transfers; L/C or BG if a project uses them |
| 1.15–1.16 Third party | Fill if a parent company or project owner pays instead of your contracting client |
| Part 2B description | Specific: "Piping isometrics — Package 3, Phase 2" |
| Part 2B contract no. & date | Your purchase order or service agreement reference |
The third-party payer
Engineering projects often have layered contracts. You might be engaged by an EPC contractor's regional office while the payment comes from its head office in another country. If the payer differs from the service recipient, fill fields 1.15 and 1.16 (third party and relationship) and keep documents that explain the arrangement. Your bank may ask for them.
L/C and bank guarantees
Some infrastructure clients pay through letters of credit or ask for performance guarantees. If an invoice is settled under an L/C, select L/C in field 1.12 and fill 1.19 with the AD bank handling it.
SAC and purpose codes for engineering work
Purpose code: P1009 covers architectural, engineering and other technical services. It's the natural candidate for most engineering design receipts, but the code is assigned by your bank on each inward remittance. Check every FIRA and use our purpose code finder if you're unsure.
SAC code: engineering services have their own headings within the GST services classification, distinct from IT consulting or software development. The right six-digit code depends on what you actually deliver — design, project management, technical testing and so on. Don't default to an IT code because you use software tools. Confirm with your CA, and browse candidates in the SAC code finder.
Invoice patterns and how they flow into the EDF
Man-hour or timesheet billing. Many firms invoice monthly for hours worked, backed by timesheets. One invoice per client per month is simple for the EDF. Keep the approved timesheet with the invoice — it supports the amount if the bank or an auditor asks.
Deliverable-based billing. Fixed fees for packages or drawing sets. Each invoice goes on the EDF for the month it's dated, regardless of when the work started.
Retainers. A fixed monthly fee for a standing team or on-call design support. Treat it like any recurring invoice.
Variation orders. Extra scope billed separately. Raise a separate invoice with a clear reference to the variation and the original contract.
Worked example: a Vadodara firm with Gulf and European clients
Sabarmati Process Engineering Pvt Ltd raises these invoices in May 2027:
| Invoice | Client | Basis | Amount | Approx. INR | Delivery |
|---|---|---|---|---|---|
| SPE/27-28/031 | EPC contractor, UAE | Man-hours, April | AED 68,000 | ₹15.6 lakh | Internet |
| SPE/27-28/032 | Chemical plant owner, Belgium | Design review package | EUR 11,500 | ₹10.6 lakh | Internet |
| SPE/27-28/033 | EPC contractor, Saudi Arabia | Site hazard review (engineers on site 8 days) | SAR 24,000 | ₹5.4 lakh | Others |
All three go on one May EDF, due 30 June 2027. Two invoices exceed ₹10 lakh, so when paid, Sabarmati sends the bank each invoice, the FIRA and matching instructions. The third can be covered in a periodic declaration of realisation.
The site review invoice deserves a careful description in Part 2B — who travelled, for how long, and what was delivered — because the delivery mode differs from the rest. Our article on services delivered on site abroad covers that row in more detail.
Slow payers and the 9-month window
Engineering clients, especially large EPC contractors, can take 120 days or more to pay, and disputes over deliverables can stretch that further. The rule is fixed: the full value of each services invoice must be realised within 9 months from the invoice date (12 months if invoiced in rupees). Your AD bank can extend the period on a reasoned request.
Practical steps:
- Track each invoice's 9-month date in your EDF register, not just the overall receivable.
- At around six months, chase in writing and record the client's response.
- If payment clearly won't arrive in time, write to your bank before the deadline explaining why. Our realisation extension request letter sets out what to include.
GST and LUT in one paragraph
Export of engineering services is a zero-rated supply when the Section 2(6) IGST Act conditions are met, including that the place of supply is outside India. Site-based services can raise place-of-supply questions under GST, so discuss on-site work with your CA. Most firms export under LUT and invoice without IGST. The EDF doesn't change your GST or income-tax obligations.
This is general information, not legal or tax advice.
Frequently asked questions
Which delivery mode applies to CAD drawings sent by email?
Internet. Files sent electronically are delivered over the Internet, which is one of the listed options in field 1.4. Use Others for services delivered mainly in person abroad.
Is P1009 the right purpose code for engineering design?
P1009 covers architectural, engineering and other technical services, so it fits most engineering design receipts. The bank assigns the code, so tell your bank what you do and check each FIRA.
Can one EDF cover clients in the UAE, Saudi Arabia and Europe?
Yes. One EDF per month can cover all your service exports to one or more recipients. Each invoice gets its own row with its own country and currency.
What if a client disputes part of an invoice?
Record the dispute and keep correspondence. If the amount is reduced, issue a credit note and tell your bank so the realisable value can be adjusted. If payment is delayed beyond 9 months, request an extension from your AD bank.
Do timesheets need to go to the bank with the EDF?
Usually not, unless your bank asks. Keep them with the invoice as supporting evidence, because they explain how the invoice value was calculated.
Bottom line
List every engineering invoice as its own row, use Internet or Others honestly by where the work was done, and keep a close eye on each invoice's 9-month date. Prepare your monthly declaration in the free EDF form generator.
This guide is general information for Indian businesses, not legal or tax advice. Rules and bank processes change — confirm specifics with your AD bank or chartered accountant.