18% GST on Payment Gateways & SaaS: How Merchants Can Claim ITC

Disclaimer: This article is for informational purposes only and does not constitute tax advice. Consult a GST practitioner for your specific ITC eligibility.

When calculating online business profitability, many merchants only look at the headline transaction fee charged by their payment aggregator. However, the Indian tax system applies an 18% GST on all financial services and SaaS subscriptions.

Understanding how this tax affects your bottom line — and whether you can claim it back — is crucial for maintaining healthy margins in 2026.

The Hidden Cost of Payment Processing

When a traditional payment aggregator advertises a “2% transaction fee,” that is not your final cost. The government mandates an 18% Goods and Services Tax (GST) on that service fee.

Payment aggregator services in India are classified under SAC code 997158 — “Other financial and related services.” This SAC code covers the processing, clearing, and settlement services that payment aggregators provide to merchants, and it attracts GST at the standard rate of 18%.

The Math on a Single Transaction:

Item	Amount
Transaction Value	₹10,000
Base Gateway Fee (2%)	₹200
GST on Gateway Fee (18% of ₹200)	₹36
Total Deduction from Settlement	₹236
Effective Fee Rate	2.36%

For a business doing ₹50 Lakhs in monthly volume, that additional ₹36 per ₹10,000 transaction compounds into ₹1,18,000 in additional tax outflow every month — before you account for whether any of it is recoverable.

SAC Codes and How Payment Gateway Services Are Classified

Understanding SAC codes is not just academic. Your payment aggregator’s tax invoice must reference the correct SAC to enable a valid ITC claim.

• SAC 997158 — Other financial and related services not elsewhere classified. This covers merchant discount rate (MDR) services, payment processing, and transaction settlement.
• SAC 997155 — Foreign exchange and related services (relevant for international card transactions).
• SAC 998314 — IT infrastructure and hosting services (applies to separately billed SaaS or platform fees from payment technology providers).

When you receive a monthly invoice from your payment aggregator, verify that the SAC code matches the nature of the service being charged. A mismatch can complicate your ITC claim during a GST audit.

How to Claim ITC on Gateway Fees

If your business is GST-registered and is not under the Composition Scheme, the 18% GST on payment aggregator fees is potentially claimable as Input Tax Credit (ITC) — provided it satisfies the conditions under Section 16 of the CGST Act.

Step 1: Register Your GSTIN with the Payment Aggregator

Your payment aggregator must issue a B2B tax invoice against your GSTIN. If your GSTIN is not on file, they will issue a B2C invoice, and you cannot claim the ITC. Update your GSTIN in your aggregator dashboard before the monthly billing cycle closes.

Step 2: Collect and Verify Monthly Tax Invoices

Payment aggregators typically issue a consolidated monthly invoice listing:

• Total transaction volume processed
• Total MDR charged (the taxable value)
• GST amount at 18% (the ITC you are eligible to claim)
• Their GSTIN and SAC code

For example: If you processed ₹50 Lakhs in a month at 2% MDR, your invoice will show ₹1,00,000 as taxable value and ₹18,000 as GST — which is the ITC you can potentially claim.

Step 3: Reconcile Against GSTR-2B

Before claiming ITC in your GSTR-3B, you must verify that the credit appears in your GSTR-2B on the GST portal. GSTR-2B is auto-populated based on invoices your suppliers (including payment aggregators) have filed in their GSTR-1.

If a payment aggregator files their GSTR-1 late or with errors, the credit will not appear in your GSTR-2B for that period, and claiming it without GSTR-2B support can expose you to demand notices under Rule 36(4) of the CGST Rules.

Reconciliation checklist:

• Invoice value matches GSTR-2B entry
• Supplier GSTIN is correct
• SAC code is correctly reported
• The credit period has not lapsed (ITC must generally be claimed by the due date of September GSTR-3B of the following financial year, or the annual return date, whichever is earlier)

Step 4: Claim in GSTR-3B

Once reconciled, report the ITC under Table 4(A)(5) — “All Other ITC” in your monthly GSTR-3B filing. Do not claim amounts that do not appear in GSTR-2B, as this is now a compliance risk under the amended ITC rules.

Blocked Credits Under Section 17(5): What You Cannot Claim

Not all GST paid is claimable. Section 17(5) of the CGST Act specifies blocked credits — GST paid on certain categories of goods and services that cannot be claimed as ITC regardless of business use.

Relevant blocked credits for businesses using payment services:

• Food and beverages — GST paid on meals, restaurant bills, or employee food is blocked (even if paid via your business UPI account).
• Health insurance and life insurance premiums — blocked unless mandated by law.
• Personal consumption — any services used for personal rather than business purposes.
• Motor vehicles — with limited exceptions.

Payment aggregator fees for business transaction processing are not in the blocked list under Section 17(5), which is why ITC on MDR is potentially available to eligible registered businesses. However, your business must be making taxable outward supplies — if you are in an exempt or nil-rated sector, proportionate ITC reversal rules under Section 17(2) will apply.

International SaaS & Reverse Charge Mechanism (RCM)

Beyond payment gateways, Indian businesses rely heavily on SaaS tools — cloud hosting, CRMs, marketing automation, analytics — often billed by companies based in the US or Europe.

If the foreign provider does not have an Indian GST registration and does not charge GST on their invoice, you are legally required to pay 18% GST under the Reverse Charge Mechanism (RCM) as the recipient of the service.

International SaaS imports are classified as import of services and are taxable under the IGST Act. The applicable SAC is typically 998314 (software and IT services) or 998313 (packaged software), both attracting 18% IGST.

How RCM works in practice:

Say you pay USD 200/month (~₹16,700) to a US-based analytics SaaS that has no Indian GST registration:

Item	Amount
Invoice from foreign provider	₹16,700
18% IGST you must self-assess and deposit	₹3,006
ITC available (if eligible)	₹3,006

You deposit ₹3,006 to the government via your electronic cash ledger, then claim it back as ITC in the same month’s GSTR-3B — provided your business makes taxable outward supplies. The net cash impact in that month is zero, but the compliance obligation is real. Non-compliance can result in demand, interest at 18% per annum, and penalties.

Important: RCM ITC can only be claimed in the same tax period in which it is paid. Unlike forward charge ITC which follows GSTR-2B, RCM ITC is self-assessed and must be claimed promptly.

Eliminating the GST Drag with VyaparGateway

Claiming ITC ties up your working capital for 30 to 60 days — the gap between when GST is deducted from your settlement and when you file and receive the credit offset in your next liability.

VyaparGateway offers a flat-fee UPI infrastructure model that changes the economics:

• Zero per-transaction fees on UPI: Since there is no percentage-based transaction fee, there is no MDR for GST to apply to. Your GST liability on transaction processing becomes nil.
• Predictable flat subscription: You pay a fixed monthly subscription fee. The 18% GST on a small flat fee is a fraction of what you would otherwise pay on percentage-based MDR at volume.
• Direct bank settlement: Funds settle directly to your registered bank account, so there is no float sitting with an intermediary.

For a business doing ₹50 Lakhs per month, the difference between a 2.36% effective cost (₹1,18,000) and a flat monthly subscription of even ₹5,000 (plus ₹900 GST, potentially ITC-claimable) is material working capital that stays in your business.

Stop having your working capital tied up in pending ITC cycles. Move to a predictable, low-cost UPI infrastructure model today.

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Disclaimer: This article is for informational purposes only and does not constitute tax advice. Consult a GST practitioner for your specific ITC eligibility, blocked credit applicability, and RCM obligations based on your business type and outward supply mix.