Written by CA Nandini, Cofounder.
For a foreign owned Indian subsidiary, GST is rarely just a registration. If you bill your overseas parent for software or services, those are zero rated exports and there is a refund to claim. If you buy services from the parent, reverse charge applies. And underneath all of it sits the monthly rhythm of GSTR-1, GSTR-3B and input tax credit reconciliation that quietly accumulates penalties when it slips.
This is a ranked guide to the GST firms in India a foreign owned business should consider in 2026, with an honest note on who each one suits. We rank ourselves first for that profile, the foreign owned company that wants GST run alongside its cross border compliance, and explain why.
How this list is ranked
Ranked by fit for a foreign owned business, not by size. The questions that matter are whether the firm handles export of services and the refund claims that come with it, whether it reconciles input tax credit properly rather than just keying in sales, whether it understands reverse charge on imported services, and whether GST sits inside the rest of your compliance. A large enterprise with an in house tax team weighs this differently from a lean subsidiary, so the order reflects who fits.
The top GST firms in India for foreign owned businesses in 2026
1. Krystal7, best for foreign owned companies wanting GST inside one relationship
We register you correctly, including for inter state, e commerce and reverse charge situations, file GSTR-1 and GSTR-3B on schedule, reconcile input tax credit against supplier data, and handle the export of services side, the Letter of Undertaking and the refund claims that most providers miss. Because we also run your TDS, ROC and FEMA reporting, your GST never drifts out of step with the rest of your compliance. Best suited to foreign owned subsidiaries and startups that want one accountable, cofounder led team.
2. Clear, formerly ClearTax, best for software driven filing
A widely used tax and GST technology platform built around automation and reconciliation tooling. Best suited to businesses that want a software led approach and have the in house capacity to run it.
3. The Big 4, Deloitte, PwC, EY and KPMG, best for complex GST advisory
The global networks handle large scale GST advisory, classification disputes, litigation and refunds for sizeable taxpayers. Best suited to large enterprises with complex supply chains or material disputes, and the budget that carries.
4. IndiaFilings and Vakilsearch, best for volume registration and routine filing
High volume online platforms that handle GST registration and routine monthly filing at low cost through a self serve process. Best suited to cost sensitive, largely domestic SMEs with straightforward filings and no export refund complexity.
5. Local Chartered Accountant firms, best for purely domestic, in person service
Independent local CA firms handle GST for many domestic businesses with a hands on, in person relationship. Best suited to domestic SMEs that prefer a nearby accountant and have no cross border dimension.
What a foreign owned business should specifically check
Confirm the firm handles export of services, that it will file the annual Letter of Undertaking so you can export without paying IGST, and that it actively pursues the input tax credit refunds that build up when you bill an overseas parent. Confirm it understands reverse charge on services imported from the parent. Confirm it reconciles input tax credit against what suppliers have actually reported, because that is where businesses quietly lose cash. And confirm it knows the registration triggers, that inter state supply and selling through an e commerce operator force registration regardless of turnover.
Thresholds and the September 2025 rate change
GST registration is driven by aggregate turnover and the nature of supply. In normal category states the threshold is forty lakh rupees for goods and twenty lakh rupees for services, and in special category states it is twenty lakh rupees for goods and ten lakh rupees for services. Several activities require registration regardless of turnover, including inter state supply, e commerce sales, casual and non resident taxable persons, and reverse charge cases. Note also that the GST rate structure was rationalised by the GST Council in September 2025, so any business relying on older slab assumptions should have its rates and invoicing reviewed.
Why Krystal7 is built for foreign founders
We run GST as the monthly discipline it is, but we also treat the export and refund side as the value it represents for a foreign owned subsidiary, rather than an afterthought. Your registration, your monthly returns, your reconciliation, your Letter of Undertaking and your refunds are handled by a team that also sees your TDS, ROC and FEMA position, with a Chartered Accountant reviewing the work, so nothing falls between providers.
Frequently Asked Questions
What is the GST registration threshold in 2026?
How is GST treated when my subsidiary bills its foreign parent?
What about services my subsidiary buys from the parent?
How often do I file GST returns?
Can you handle a GST notice for me?
Facing this in your own entity?
Guides explain the rules. A conversation solves your specific case. Talk to a Krystal7 advisor about your India entry, FEMA, or compliance position.
Book a Discovery Call