Ask ten interior designers how much GST they pay and nine will say "eighteen percent" and move on, and that answer is both correct and completely misleading, because the rate you charge and the tax you actually part with at the end of the month are two very different numbers. If you have ever collected 18% from clients all year and still felt like GST was eating your cash, this post is for you, because the real question is not the rate on the invoice, it is what lands in the government's account after your input tax credit does its work, and that is the number that decides whether GST is a pass-through or a slow bleed on your studio.
Let me walk through it the way I would explain it to a designer sitting across from me, in plain language, with the India-specific traps flagged, so you stop guessing and start knowing.
The rate is 18%, but that is only the sticker
Interior design and decoration is a service, and services like this attract 18% GST, split as 9% CGST plus 9% SGST when the client is in your state, or a single 18% IGST when the project is in another state. That much is settled, and you can confirm the service classifications yourself on the official GST portal rather than taking a WhatsApp forward's word for it.
But 18% is what you charge, not what you pay. GST is a value-added tax, which means you collect it from your client and you also pay it on your own purchases, and the difference between the two is what you actually remit. So the honest answer to "how much GST do I pay" is: the GST you collected on your invoices, minus the GST you already paid on your inputs, and that gap is usually a lot smaller than the 18% headline suggests.
Output tax minus input tax credit, the number that actually matters
Here is the mechanic. Every invoice you raise carries output GST, the tax you collected from the client. Every legitimate business purchase you make, your software, your design tools, materials and furniture you buy to supply, professional fees you pay, carries input GST, and most of that is claimable as input tax credit, or ITC. You subtract the credit from the output, and the balance is your cash outflow to the government.
Let me make it concrete with a rough, illustrative month.
| Line | Amount | GST at 18% |
|---|---|---|
| Design fee you billed clients | ₹5,00,000 | ₹90,000 collected (output) |
| Furniture and finishes you bought to supply | ₹2,00,000 | ₹36,000 paid (input credit) |
| Software, tools, professional inputs | ₹50,000 | ₹9,000 paid (input credit) |
| Net GST you actually remit | ₹90,000 minus ₹45,000 = ₹45,000 |
So on paper you "charged 18%", but the cash that actually left your studio was closer to nine percent of your billing, because your inputs carried credit you were entitled to claim. The studios that feel crushed by GST are almost always the ones losing this credit, either because vendor invoices were not collected properly or because the purchase was made without a GST invoice in the studio's name, and I will come back to why that leak is fixable.
Consultancy, execution, and why "how much" depends on what you sell
The next thing that changes the number is what you are actually selling. Pure design consultancy is clean, one service, 18%, done. The moment you start supplying goods, a wardrobe, a sofa, tiles, lighting, those goods carry their own HSN codes and sometimes their own GST rates, and a turnkey fit-out can even be treated as a works contract, which is a different animal again. This distinction genuinely changes your tax, and I broke it down properly in GST on consultancy versus execution, because a studio that only consults and a studio that executes are answering "how much GST" with different maths.
Getting the classification right starts with the codes, and if you are unsure which SAC applies to your design fee versus the HSN on the furniture you supply, my guide to the HSN and SAC codes for interior design services has the specific numbers, and you can cross-check any of them against a public HSN and SAC lookup. The reason this matters for "how much you pay" is simple, a wrong code either overcharges your client or understates your liability, and both come back to bite you at filing.
Do you even cross the threshold?
Worth a reality check, because not every studio has to charge GST at all. Registration is mandatory once your annual turnover crosses ₹20 lakh, or ₹10 lakh in a few special-category states, and below that it is optional. In practice, most serious studios cross that line fast once you add design fees to the furniture and materials you supply, so if you are anywhere near it, register early rather than scrambling mid-year. The threshold rules and the current notifications sit with CBIC-GST, which is the authority worth bookmarking over any second-hand summary.
Read that chart the right way, because it is the whole argument in one picture. The tax you actually remit is the collected amount minus the credit you manage to keep, and the middle bar, credit lost to missing vendor invoices, is pure self-inflicted damage. Every vendor bill you fail to capture with your GSTIN on it is money you hand the government that you did not have to.
The real leak is bookkeeping, not the rate
Here is my honest take after watching a lot of studios. Nobody actually overpays GST because the rate is high, they overpay because their credit leaks, and credit leaks because records are scattered. A vendor sends a bill to a personal number, it never gets entered, the credit is lost. A quote gets re-typed as an invoice in Excel and a code is wrong, the client's accountant bounces it, the payment and the credit both stall. This is exactly why I keep pushing studios towards GST-ready records kept through the project rather than a month-end reconstruction, because credit you cannot prove is credit you do not get.
It is also why I do not think of invoicing and bookkeeping as separate chores from running the studio. When your specs, your approved quote and your final invoice all live in one place, the SAC and HSN codes carry through, the number series stays unbroken, and the vendor bills that back your input credit are captured as you go, not hunted for in March. If you are still comparing tools, my roundup of the best software for interior designers in India walks through what "GST-ready" should actually mean, and the mechanics of turning a clean quote into a compliant bill sit in how to raise a GST-compliant invoice for design work.
Key takeaways
- The 18% is what you charge, not what you pay, your real cost is output tax minus input credit
- Most GST pain is lost credit from uncaptured vendor invoices, and that is fixable
- What you sell, pure consultancy or execution with goods, changes the maths
- Keep records through the project, because credit you cannot prove is credit you lose
Frequently asked questions
How much GST do interior designers actually pay in India?
You charge 18% on design services, but you remit the tax you collected minus the input tax credit on your own GST-paid purchases, so the net cash you part with is usually well below 18% of your billing.
What is input tax credit for a design studio?
It is the GST you already paid on business purchases like furniture you supply, software and professional inputs, which you subtract from the GST you collected from clients before remitting the balance.
Do I have to register for GST as a small studio?
Registration is mandatory once turnover crosses ₹20 lakh, or ₹10 lakh in a few special-category states. Below that it is optional, though most studios cross it quickly once you add supplied goods to design fees.
Why does my GST feel higher than it should?
Almost always because you are losing input credit. Vendor bills without your GSTIN, or purchases never entered into your books, silently increase the tax you actually remit.
The short version is this. Stop thinking of GST as an 18% tax and start thinking of it as a running account of tax collected against tax paid, because the studios that keep that account clean pay only what they truly owe, and the ones that do not quietly overpay all year.
If you want to see how a quote becomes a compliant GST invoice with the credit trail intact, there is a live demo at demo.designa.work, and the founding offer is one flat price for your whole studio, billed in rupees with unlimited free client logins, over at go.designa.work.