Professional practices — law firms, chartered accountancy firms, company secretary firms, and cost accountant firms — operate under a GST framework that is deceptively complex. On the surface, the position appears simple: professional services attract GST at 18%, registration is required above the ₹20 lakh threshold, and ITC can be claimed on business expenses. But beneath this simple surface lie several technical traps that routinely catch professional firms off guard.
The first trap is the reverse charge mechanism on legal services. When a law firm engages an advocate, the firm is liable to pay GST under RCM. But when a law firm engages another law firm, the position is forward charge. Distinguishing between an "advocate" and a "firm of advocates" is critical, and errors here lead to demands and penalties.
The second trap is cross-charge between branch offices. Multi-locational firms with offices in different states are treated as distinct persons under Section 25(4). When the head office incurs common expenses — library subscriptions, software licenses, professional indemnity insurance — and allocates them to branch offices, the transaction is a supply between distinct persons. The firm must issue a tax invoice, apply Rule 28 valuation, and ensure ITC flow. With the ISD mechanism becoming mandatory from April 2025, firms must now route all common input service invoices through the ISD and distribute ITC via ISD invoices and GSTR-6.
This article provides a comprehensive GST advisory framework for professional practices.
GST Registration for Professional Firms
GST registration is mandatory for professional firms once aggregate turnover exceeds ₹20 lakh in a financial year (₹10 lakh for special category states). For firms providing inter-state services, registration is required from the first transaction. Voluntary registration is often beneficial even below the threshold, as it allows the firm to claim ITC on business expenses.
The registration threshold is computed on the aggregate turnover of the firm, not individual partners. A partnership firm with multiple partners must aggregate the turnover of all services provided by the firm.
GST Rate on Professional Services
Professional services attract GST at 18% . The applicable SAC codes include:
- SAC 998211: Legal advisory and representation services.
- SAC 998212: Legal documentation and certification services.
- SAC 998221: Accounting and bookkeeping services.
- SAC 998222: Auditing services.
- SAC 998223: Tax consultancy and preparation services.
- SAC 998231: Company secretary services.
- SAC 998232: Cost accounting services.
Reverse Charge Mechanism on Legal Services
The most common RCM trap for professional firms is legal services. Under Notification No. 13/2017-Central Tax (Rate), Entry 2, legal services provided by an advocate or a firm of advocates to a business entity attract GST under RCM. The recipient business entity is liable to pay GST.
The critical distinction is between:
- Advocate: A legal practitioner entitled to appear before courts.
- Firm of advocates: A partnership firm of advocates.
Both are covered under RCM. However, legal services provided by a law firm structured as an LLP or company are not covered under RCM — they attract forward charge, and the law firm charges GST on the invoice.
This distinction creates significant confusion. A business entity engaging an advocate must pay GST under RCM. A business entity engaging a law firm LLP must pay GST on the invoice.
For the professional firm itself, when it engages an advocate, the firm must:
- Issue a self-invoice under Section 31(3)(f).
- Issue a payment voucher.
- Pay GST in cash through the electronic cash ledger.
- Claim ITC in the same return, subject to eligibility.
ITC for Professional Firms
Professional firms can claim ITC on GST paid for:
- Office rent and utilities.
- Software and tools (legal research, accounting software).
- Professional literature and subscriptions.
- Staff training and development.
- Marketing and advertising.
- Professional indemnity insurance.
- Communication expenses.
ITC is blocked on:
- Personal expenses of partners.
- Food and beverages.
- Membership fees of clubs.
- Motor vehicles (with exceptions).
- Goods or services used for personal consumption.
Cross-Charge Between Branch Offices
Multi-locational firms face the cross-charge requirement. When the head office provides services to branch offices — such as centralised IT support, HR, or finance — the transaction is a supply between distinct persons. The head office must:
- Issue a tax invoice to the branch.
- Apply Rule 28 valuation.
- Charge GST at 18% (if applicable).
Where the branch is eligible for full ITC, the second proviso to Rule 28(1) allows the head office to issue a nil-value invoice. The CBIC Circular No. 199/11/2023-GST clarifies this.
The Mandatory ISD Mechanism
From 1st April 2025, the ISD mechanism is mandatory for all registered persons having multiple GST registrations. Professional firms with offices in multiple states must:
- Obtain ISD registration in Form GST REG-01.
- Route all common input service invoices through the ISD.
- Issue ISD invoices to branches based on the turnover ratio.
- File GSTR-6 by the 13th of the following month.
The ISD mechanism replaces the cross-charge approach for distributing ITC on common input services. Cross-charge may continue for non-ITC cost allocations.
Compliance Checklist for Professional Firms
- Register for GST if turnover exceeds the threshold.
- Charge 18% GST on professional services.
- Pay GST under RCM on legal services from advocates.
- Issue self-invoices and payment vouchers for RCM transactions.
- Claim ITC on eligible business expenses.
- Obtain ISD registration if multi-locational.
- File GSTR-1, GSTR-3B, and GSTR-6 (if ISD).
- Reconcile ITC claims with GSTR-2B.
- Maintain proper records for audit purposes.
Conclusion
Professional firms face a complex GST environment. The RCM on legal services, cross-charge between branches, and the mandatory ISD mechanism are areas where errors are common. A professional advisor ensures that the firm's GST position is compliant and optimised.
At Anuj Desai & Associates, we provide expert GST advisory services for legal firms, CA firms, CS firms, and other professional practices. Our team handles registration, RCM compliance, ITC optimisation, cross-charge structuring, and ISD implementation.
For a confidential consultation, contact us at office@anujdesaiassociates.com or call 9619456656. Visit our website at https://anujdesaiassociates.com or connect with our founder on LinkedIn at linkedin.com/in/ca-anuj-desai-122547230.