GST for Service Providers

GST for Service Providers

GST for Indian service providers turns on three interlocking decisions you must get right before you issue a single invoice: whether you need to register, which tax — IGST or CGST+SGST — applies to each transaction, and whether your input tax credit will survive the matching process. In FY 2026-27, the registration threshold for services remains Rs. 20 lakh (Rs. 10 lakh in special-category states), exports are zero-rated only with correct LUT documentation, and reverse-charge obligations can silently inflate your tax bill if left untracked. This guide walks through every pressure point with worked numbers you can apply today.

When You Must Register for GST as a Service Provider

Turnover-Based Thresholds

Your aggregate turnover — every taxable supply, exempt supply, export and inter-state supply across all your registrations, computed on an all-India basis — triggers mandatory registration once it crosses:

• Rs. 20 lakh in a financial year for most states
• Rs. 10 lakh for the eleven special-category states (including Manipur, Mizoram, Nagaland, Tripura, and others notified under the GST Acts)

Count this on a rolling, financial-year basis. The moment you project a breach during FY 2026-27, apply for registration before raising the invoice that crosses the limit — not the month after.

Mandatory Registration Regardless of Turnover

Certain triggers override the threshold entirely:

• Inter-state supply of services — if you are in Maharashtra and your client is in Karnataka, you must register, even if your total annual billing is Rs. 4 lakh
• Casual taxable person — running a project or event in a state where you have no fixed establishment
• Non-resident taxable person — a foreign entity making taxable supplies in India
• E-commerce operator platforms — suppliers operating through platforms that collect tax at source under Section 52
• Voluntary registration — below threshold but clients are registered businesses who need to claim ITC on your invoices

The B2B Voluntary-Registration Decision

If your turnover is below Rs. 20 lakh but your entire clientele consists of registered businesses, voluntary registration is almost always the right call. Without a GSTIN, you are effectively 18% more expensive than a registered peer — because your client cannot claim ITC on unregistered-supplier invoices. Voluntary registration changes that equation immediately.

Place of Supply: Getting IGST vs. CGST+SGST Right

Place of supply is the single most mis-tagged field in service invoices. Tag it wrong and you charge the wrong tax head, your buyer cannot use the credit, and you are forced into credit notes and amended returns.

The General B2B Rule

Under Section 12(2) of the IGST Act, when both parties are in India and the recipient is a registered person, the place of supply is the location of the recipient:

• Your firm is in Bengaluru, client registered in Delhi → interstate → IGST
• Your firm is in Bengaluru, client registered in Hyderabad → interstate → IGST
• Your firm is in Bengaluru, client registered in Bengaluru → intrastate → CGST + SGST

The General B2C Rule

When the recipient is unregistered, the default place of supply is the location of the supplier (Section 12(2)). A Mumbai-based freelancer advising an unregistered Delhi businessman? The supply is intrastate for the freelancer — CGST + SGST — regardless of where the client sits.

Specific Overrides You Cannot Ignore

Several service categories have rules that override the general principle:

If your firm runs on-site workshops in multiple states for unregistered participants, each invoice carries a different place of supply. Build this determination into your invoicing workflow — not as an afterthought when filing GSTR-1.

Exporting Services: Using the LUT Route in Practice

An export of services is zero-rated under Section 16(1) of the IGST Act. You charge no GST on the invoice and can reclaim accumulated ITC attributable to those exports.

The Five Mandatory Conditions (Section 2(6), IGST Act)

All five must be simultaneously satisfied:

1. The supplier is located in India
2. The recipient is located outside India
3. The place of supply is outside India (determined under Section 13, IGST Act)
4. Payment is received in convertible foreign exchange — or in Indian rupees where the RBI permits (exports to Nepal or Bhutan in INR qualify)
5. The supplier and recipient are not merely establishments of the same distinct person — you cannot zero-rate a transaction with your own overseas branch as if it were a genuine third-party export

If even one condition fails — for example, your overseas client is a related party and payment is routed through an Indian affiliate — the zero-rating does not apply.

Step-by-Step: Filing the LUT Before Your First Export Invoice

A Letter of Undertaking (Form GST RFD-11) lets you supply zero-rated services without paying IGST upfront. File it once per financial year:

1. Log in to the GST portal → Services → User Services → Furnish Letter of Undertaking (LUT)
2. Select FY 2026-27, confirm the statutory undertaking, and submit using DSC or EVC
3. Download the system-generated acknowledgement — keep it on file as your LUT reference
4. Issue all export invoices noting zero-rated supply under LUT; tag the place of supply as outside India; charge nil GST

Critical: File the LUT before the first export invoice of the year. A retroactively filed LUT does not protect invoices already issued without one. Those prior invoices may attract a demand for IGST plus 18% interest.

Claiming Your Refund: Form GST RFD-01

Under the LUT route, ITC accumulates because outputs are zero-rated. Reclaim it by filing Form GST RFD-01 on the GST portal:

• Filing window: within two years of the relevant date (generally the date of export invoice for services)
• Supporting documents: GSTR-2B-reconciled ITC statements, export invoices, Foreign Inward Remittance Certificates (FIRCs) or Bank Realisation Certificates (BRCs), Statement 3A of invoices
• Timeline: provisional refund of 90% within 7 working days; final order within 60 days of complete filing
• Respond to any deficiency memo within 15 days or the application risks rejection

Treat export refunds as a scheduled quarterly receivable. Service exporters who file RFD-01 within 30 days of each quarter-close consistently report better working capital than those who accumulate claims for year-end.

Input Tax Credit: Claiming What You Are Actually Entitled To

The GSTR-2B Matching Requirement

In FY 2026-27, ITC flows exclusively through GSTR-2B — the auto-populated statement generated on the 14th of each month based on your suppliers' filed GSTR-1s. Credit not visible in GSTR-2B is not available for that period, regardless of whether you hold the physical invoice.

Rule 37A (in force since November 2022) adds a further restriction: if a supplier does not file their GSTR-3B for a given period by 30 September of the following financial year, you must reverse the ITC availed from them for that period, with interest at 18% per annum from the date of original availment. Re-credit is possible only after the supplier actually files. Monitor your top suppliers' filing compliance monthly — one delinquent vendor can cost you a meaningful ITC reversal mid-year.

The 180-Day Rule (Rule 37)

If you avail ITC on a purchase invoice but do not pay the supplier (inclusive of GST) within 180 days of the invoice date, you must reverse that ITC in your next GSTR-3B. The reversed amount is added to your output tax liability and attracts interest at 18% from the date of original availment.

Once you actually pay the supplier, re-avail the credit — but the interest on the interim period remains your cost. Run a monthly aged-creditors report filtered on GST invoices unpaid beyond 150 days. Settle or consciously reverse before day 181.

Section 17(5): Credits That Are Permanently Blocked

No matter how clearly business-related, ITC is unavailable on:

• Motor vehicles for passenger transportation (exceptions exist for fleet operators, driving schools, ambulances)
• Food and beverages, outdoor catering, restaurant services
• Club memberships and health/fitness centre fees for employees
• Rent-a-cab services (unless providing such services is your core business)
• Works contract services for construction or repair of immovable property used in business
• Health services, beauty treatment, cosmetic surgery for employees

Service firms routinely lose ITC on team lunches, hotel restaurants during client meetings, gym memberships, and corporate retreats. These are irrecoverable — budget accordingly, and stop attaching GST invoices for these to your ITC workings.

Apportionment for Partially Exempt Businesses

If your outputs include both taxable and GST-exempt supplies — an education company running both taxable executive programmes and exempt school curricula, for instance — you must apportion ITC under Rules 42 and 43 of the CGST Rules. Only the proportion attributable to taxable outputs is creditable. Reverse the exempt-supply proportion every month and reconcile annually in GSTR-9.

Reverse Charge Mechanism: When You Are the Taxpayer as a Service Buyer

Under the reverse charge mechanism (RCM), specified by Notification 13/2017-CT(R) and Section 9(3) of the CGST Act, the recipient — not the supplier — pays the GST. These are the most commonly encountered RCM triggers for service businesses:

How to account for RCM in GSTR-3B:

1. Report the RCM liability in Table 3.1(d) — "Inward supplies liable to reverse charge"
2. Report eligible RCM ITC in Table 4(A)(3) in the same or a subsequent GSTR-3B
3. Pay the RCM amount via the electronic cash ledger — standard practice is to settle in cash, then re-avail the credit
4. Maintain a monthly RCM register listing the service, supplier, invoice value, GST computed, and date reported

If you regularly pay advocate fees, director fees, or subscribe to overseas SaaS tools (AWS, Salesforce, Adobe, HubSpot), build a monthly RCM checklist. Missing a quarter's RCM on a Rs. 5,00,000 advocate bill means Rs. 90,000 in unpaid tax, plus 18% interest from the due date, plus potential penalty exposure.

Worked Example: Meridian Consulting's October 2026 GSTR-3B

Meridian Consulting Pvt. Ltd. is a Karnataka-registered IT consultancy. Here is a full reconstruction of their October 2026 GST position.

Revenue and Output GST

Output tax subtotal: IGST Rs. 2,16,000 | CGST Rs. 63,000 | SGST Rs. 63,000

Reverse Charge Obligations (Both Liability and ITC)

• Advocate fees (Bengaluru-based advocate): Rs. 80,000 → RCM CGST Rs. 7,200 + SGST Rs. 7,200
• Independent director sitting fees: Rs. 50,000 → RCM CGST Rs. 4,500 + SGST Rs. 4,500

RCM additions to output tax: CGST Rs. 11,700 | SGST Rs. 11,700

Total output tax (output + RCM): IGST Rs. 2,16,000 | CGST Rs. 74,700 | SGST Rs. 74,700

Input Tax Credit Available from GSTR-2B

Total eligible ITC: IGST Rs. 36,000 | CGST Rs. 34,200 | SGST Rs. 34,200

Net Cash Payable — Due 20 November 2026

Meridian separately files a quarterly RFD-01 for ITC attributable to the zero-rated US export. That refund is a receivable, not a write-off.

What if Meridian files GSTR-3B 15 days late (5 December instead of 20 November)?

• Late fee: Rs. 50/day × 15 days = Rs. 750
• Interest on Rs. 2,61,000 unpaid: Rs. 2,61,000 × 18% × 15 ÷ 365 = Rs. 1,929
• Total extra cost for a 15-day slip: Rs. 2,679 — seemingly small, but multiply by twelve months and it compounds into a compliance drag that also disrupts client GSTR-2B.

E-Invoicing: Is Your Service Business Covered?

E-invoicing under the CGST Rules requires businesses above the prescribed aggregate annual turnover threshold to generate an Invoice Reference Number (IRN) for every B2B invoice through the Invoice Registration Portal (IRP) before the invoice is issued to the client.

Current threshold: Businesses with aggregate turnover exceeding Rs. 5 crore in any preceding financial year must generate IRN. Verify the latest applicability on the official IRP portal, as this threshold has been progressively reduced since October 2020 and a further reduction cannot be ruled out.

What E-Invoicing Actually Changes in Your Process

1. Your GST-compliant billing software (Tally Prime, Zoho Books, ClearTax, Vyapar, BUSY) submits the invoice in JSON format to the IRP via API
2. The IRP validates the data, assigns an IRN, and returns a digitally signed response with an embedded QR code
3. You print the QR-coded invoice and deliver it to your client — this is the legally valid tax document
4. The IRN auto-populates your GSTR-1 and flows directly into the recipient's GSTR-2B — eliminating the manual-upload step and the mismatch disputes that come with it

An invoice issued without a mandatory IRN is not a valid GST document. Your client cannot claim ITC on it, and you face a penalty of Rs. 10,000 per invoice under Section 122. Service businesses that crossed the e-invoicing threshold and implemented it promptly typically report a significant reduction in ITC-mismatch queries from clients — because the data trail is automatic and authoritative.

Pitfalls to Avoid: Where Service Providers Lose Real Money

Missing or Incorrect GSTIN on the Invoice

An invoice with a wrong or absent recipient GSTIN blocks ITC for your buyer. They will hold payment pending a corrected document. Before every invoice run, validate GSTINs using the GST portal's Search Taxpayer tool — free, instant, and a 10-second habit that prevents costly corrections.

Charging the Wrong Tax Head

Raising a CGST+SGST invoice for an interstate B2B supply — or vice versa — requires a credit note and a fresh invoice, both of which need to flow through GSTR-1. Your client cannot cross-utilise the wrong-head tax as credit. Courts and Appellate Authorities for Advance Rulings have consistently held that incorrectly charged tax cannot be offset without formal rectification.

Exporting Without a Valid LUT

An export invoice issued without a valid, filed LUT is treated as a domestic taxable supply. IGST becomes due on the entire invoice value — plus interest at 18% per annum from the due date of the GSTR-3B for that period. Filing the LUT retroactively does not undo this liability for invoices already raised.

Ignoring RCM on Overseas SaaS and Cloud Services

Every monthly payment to AWS, Google Workspace (enterprise tier), Salesforce, Adobe, HubSpot, or any non-Indian SaaS provider is an import of services under Section 5(3) of the IGST Act. IGST is payable under RCM at the applicable rate on each invoice. Many service businesses have three to five years of missed RCM on overseas software subscriptions sitting undetected until a GST audit surfaces them — often simultaneously with interest and penalty exposure.

Letting ITC Age Beyond 180 Days Without Action

Your accounts payable team and your GST team must communicate monthly. An invoice unpaid for 200 days that you have not reversed yet means the ITC availed must now come back with interest, calculated from the date of original availment. A simple monthly report — "GST invoices unpaid beyond 150 days" — gives you a 30-day window to either pay or reverse before the liability crystallises.

Treating GSTR-3B as a Back-Office Task

The 20th of each month (22nd or 24th for QRMP filers, depending on your state category) is a hard deadline with a cash consequence, not an administrative chore. A consistent pattern of late filing disrupts your clients' GSTR-2B, damages business relationships, generates interest charges that are entirely avoidable, and creates reconciliation headaches in your annual GSTR-9.

FY 2026-27 GST Compliance Calendar for Service Providers

Key Takeaways

• Register before crossing Rs. 20 lakh — or before your first interstate supply, whichever comes first; voluntary registration is almost always worth it for B2B-focused businesses even below the threshold.
• Determine place of supply before raising the invoice — B2B supplies follow the recipient's location; B2C supplies default to the supplier's location, with specific overrides for immovable property, venue-based services, and transport.
• File your LUT at the very start of FY 2026-27 — an export invoice issued without a valid, filed LUT attracts IGST plus interest, and there is no retroactive cure.
• GSTR-2B is the only source of truth for ITC — credit not appearing there is not available; monitor supplier filing behaviour monthly and apply Rule 37A reversals before 30 September 2027.
• RCM on advocate fees, director fees, and imported SaaS is not optional — every missed reporting period accumulates interest and penalty exposure that will surface in an audit.
• A 15-day GSTR-3B delay on a modest tax liability costs roughly Rs. 2,700 in fees and interest — multiply that across a year and the compounding effect on both cost and client relationships is significant.
• Export refunds (RFD-01) are a cash-flow asset, not a windfall — file quarterly, respond to deficiency memos within 15 days, and model them into your working-capital forecast as you would any trade receivable.