GST Invoice Rules for Freelancers, Agencies & IT Consultants (2026 Guide)
Everything you need to know about GST registration thresholds, mandatory invoice fields under Rule 46, SAC codes for digital services, and how to legally pay 0% GST on foreign client income using a Letter of Undertaking (LUT).
- Threshold: Mandatory only if turnover exceeds ₹20 Lakhs/year (₹10 Lakhs for special northeastern states).
- Standard Rate: Most IT, software, and marketing services are taxed at 18% GST.
- Foreign Clients: Taxed at 0% (Zero-Rated) if you file a free online LUT (Letter of Undertaking).
- Invoice Compliance: Serial numbers must be unique per financial year and consecutive.
1Do Freelancers & Independent Consultants Need GST Registration?
Under the Indian Goods and Services Tax (GST) framework, independent professionals—including freelance software engineers, UI/UX designers, copywriters, digital marketing consultants, and boutique agency founders—are legally classified as service providers.
GST registration is completely voluntary. You can legally invoice domestic clients using your personal PAN card without adding GST.
GST registration is mandatory within 30 days of crossing ₹20 Lakhs in aggregate turnover during the financial year.
Unlike sellers of physical goods (who must register for GST immediately upon making an interstate sale), service providers enjoy an exemption up to ₹20 Lakhs even if you provide services to clients in another Indian state (Notification No. 10/2017 – Integrated Tax).
2How to Calculate CGST + SGST vs. IGST on Invoices
When billing domestic Indian clients with an active GSTIN, you must apply the tax based on the Place of Supply (the client's registered state):
Case A: Intra-State Supply (Client in the Same State)
If your registered business address is in Gujarat and your client is also in Gujarat, the 18% GST is split equally into 9% CGST (Central Tax) and 9% SGST (State Tax).
Case B: Inter-State Supply (Client in Another State)
If your registered business is in Gujarat and your client is in Maharashtra or Karnataka, you bill the full 18% as IGST (Integrated Tax).
💡 Our free GalaxyOfAI Invoice Maker calculates both splits automatically with one click.
3Common SAC Codes for Freelancers & Agencies (2026)
Services Accounting Codes (SAC) are mandatory 6-digit codes used on tax invoices to identify the exact service classification:
| Service Domain | SAC Code | Applicable GST |
|---|---|---|
| Custom Software & App Development | 998314 | 18% |
| Website Hosting, Cloud & Domain Setup | 998315 | 18% |
| Graphic, UI/UX & Logo Design | 998391 | 18% |
| Digital Marketing, SEO & Social Ads | 998361 | 18% |
| Technical Content Writing & Copywriting | 998399 | 18% |
| Management & Business Strategy Consulting | 998311 | 18% |
4Billing Foreign Clients: How to Legally Pay 0% GST Using an LUT
If you work on platforms like Upwork, Fiverr, Toptal, or bill direct clients located in the United States, Europe, Australia, or the UAE, your work is classified as an "Export of Services".
- Supplier Location: You (the service provider) must be located in India.
- Recipient Location: The client must be located outside India.
- Place of Supply: The benefit of the service must reside outside India.
- Convertible Foreign Currency: Payment must be received in convertible foreign currency (USD, EUR, GBP, etc.) or INR authorized via an inward remittance certificate (FIRC/FIRS from your bank, Wise, or PayPal).
- Letter of Undertaking (LUT): You must file form GST RFD-11 (LUT) on the GST portal before issuing invoices.
5Rule 46 Checklist: Mandatory Fields on Every Valid Tax Invoice
Under Rule 46 of the CGST Rules, an invoice missing any of these mandatory fields can be deemed invalid, resulting in input tax credit (ITC) rejections for your clients:
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Frequently Asked Questions (FAQ)
What happens if I cross ₹20 Lakhs and don't register for GST?
Failing to register within 30 days of crossing ₹20 Lakhs can attract a penalty of 10% of the tax due (minimum ₹10,000) under Section 122 of the CGST Act, plus retrospective tax liabilities on invoices issued after crossing the limit.
Can freelancers opt for the Composition Scheme?
Yes, service providers with aggregate turnover up to ₹50 Lakhs can opt for the Composition Scheme under Section 10(2A) and pay a flat 6% GST (3% CGST + 3% SGST) without claiming Input Tax Credit. However, composition dealers cannot collect GST from clients or issue tax invoices (they issue a "Bill of Supply").
What should I do if a client delays paying my GST invoice?
Even if the client pays late, you must deposit the GST collected with the government by the 20th of the following month (GSTR-3B). Use our free WhatsApp Payment Follow-Up Generator to send polite, firm reminders to expedite invoice settlement.
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