GST for interior designers in India: the plain-English version
Most designers I meet are brilliant at space planning and hopeless at GST. That's fine. Nobody started a studio because they loved reverse-charge mechanisms. But GST is one of those things that quietly eats your margin and your weekends if you ignore it, and it's genuinely not that complicated once someone explains it without the jargon.
So here's the whole thing, plain. No CA-speak. Just what a working studio owner in India actually needs to know about registration, rates, invoicing, and input credit.
One disclaimer up front: I run a software company, not a CA firm. Treat this as a solid working map, not legal advice. For your specific numbers, loop in your accountant. Now let's go.
Do you even need to register?
The trigger is your turnover, not your ego. For services, the GST registration threshold is ₹20 lakh of annual turnover in most states (₹10 lakh in a handful of special-category states). Cross that in a financial year and registration becomes mandatory.
But there are cases where you must register regardless of turnover:
- You make inter-state supplies of services, a Bangalore studio designing a flat in Mumbai for a client billed at their Maharashtra address. The moment your work crosses state lines, the ₹20 lakh cushion can disappear for that activity.
- You sell on any e-commerce or aggregator platform that collects payment on your behalf.
- You want to claim input credit on all the GST you're already paying to vendors, software, and freelancers.
That last one is the real reason most serious studios register even before they're forced to. If you're buying furniture, hardware, and hiring sub-contractors, you're paying a mountain of GST every month. Registration is what lets you get some of it back. More on that below.
If you're under the threshold and mostly local, you can stay unregistered, but then you can't charge GST, can't claim credit, and some corporate or builder clients simply won't work with an unregistered vendor because they lose their own input credit. That single factor pushes a lot of studios to register early.
What rate do you charge?
Here's where designers get confused, because interior work is a mix of things.
Pure design and consultancy services, concept, drawings, space planning, site supervision, project management fees, attract 18% GST. This is your professional fee. If you invoice a design fee of ₹1,00,000, you add ₹18,000 GST, and the client pays ₹1,18,000.
Then it gets nuanced:
- Goods you supply, furniture, lights, tiles, sanitaryware, modular units, carry their own GST rates depending on the item (often 18%, sometimes higher or lower). If you're buying and reselling, you charge GST on the goods at the goods rate.
- Turnkey / works-contract execution, where you're doing civil work, false ceilings, fixed woodwork embedded into the building, often falls under works contract, which has its own treatment and rate. This is a different animal from pure design fees and worth a specific conversation with your CA.
The practical mistake I see: studios bundle everything into one line, "Interior work, ₹15 lakh," and slap one rate on it. That's risky. Separate your design fee from your goods supply from your execution. It's cleaner, it's defensible in an audit, and it usually works out better on tax. Getting this line-item discipline right is exactly what I cover in how to raise a GST-compliant invoice for design work.
The invoice: get the boring details right
A GST invoice isn't a fancy PDF. It's a legal document, and it needs specific fields or your client can't claim credit, which means they'll bounce it back to you and hold payment. Non-negotiables:
- Your legal name, address, and GSTIN
- A unique, sequential invoice number (no gaps, no resets mid-year, the series has to be continuous)
- Date of issue
- Client name, address, and their GSTIN if they're registered
- HSN/SAC code, for design services the SAC is typically 9983 (or the relevant code); goods use HSN codes
- Description, quantity, taxable value
- Rate and amount of CGST, SGST, or IGST shown separately
- Place of supply
That "place of supply" line trips people up constantly, because it decides whether you charge CGST+SGST (client in your state) or IGST (client in another state). For a Delhi studio working on a Gurgaon site, is the place of supply Delhi or Haryana? The rules for immovable-property-linked services are specific, and getting it wrong means the wrong tax heads and a messy correction later. I broke down the logic separately in place of supply for interior design services, explained, read it before you send your next inter-state invoice.
Client advances, the part everyone gets wrong
Interior projects run on advances. 40% to start, 30% at some milestone, balance on handover. Standard. But here's the catch that surprises people: for a supply of services, GST is generally due when you receive the advance, not when you finish the work.
So if a client pays you ₹4 lakh advance on a ₹10 lakh design fee, GST on that ₹4 lakh is due in that month's return, even though you haven't drawn a single line yet. You raise a receipt voucher, account for the tax, and adjust it against the final invoice later.
Miss this and you'll be paying tax out of pocket at month-end on money you already spent on the project. I've watched studios get cash-flow-squeezed purely because they treated advances as "not yet taxable." It's the single most common GST cash-flow trap in this business, and it's fully avoidable, the mechanics are in how to handle client advances and GST the right way.
Input tax credit, your margin's best friend
This is the good part. Input Tax Credit (ITC) means the GST you pay on business purchases can be set off against the GST you collect from clients. You only remit the difference.
Rough example. In a month you invoice clients and collect ₹1,80,000 of GST (output). In the same month you paid GST on:
- Furniture and materials bought for projects, say ₹90,000
- A freelance 3D renderer's invoice, ₹9,000
- Your design software, rent (if the landlord is registered), electricity for the studio, printing, laptops, say ₹15,000
That's ₹1,14,000 of input credit. You collected ₹1,80,000, you offset ₹1,14,000, and you actually pay the government only ₹66,000. Without ITC you'd have handed over the full ₹1,80,000. That gap is real money staying in your studio.
But ITC comes with rules, and this is where discipline matters:
- The purchase must be for business use, backed by a valid tax invoice with your GSTIN on it.
- Your vendor must have actually filed their return and paid the tax, their invoice has to show up in your GSTR-2B. If your carpenter took cash and never filed, you lose that credit. Choose registered, compliant vendors.
- No ITC on blocked items, personal expenses, certain motor vehicles, and works-contract inputs for immovable property in specific situations. Don't assume everything qualifies.
- Claim it in time. Miss the window for a financial year and that credit is gone.
The operational takeaway: capture every purchase invoice, match it against your GSTR-2B every month, and stop paying key vendors in undocumented cash. Sloppy record-keeping is the same as voluntarily donating your margin to the government.
TDS, because someone will deduct yours
Separate from GST, but it hits the same invoice. When you bill corporate clients, builders, or larger firms, they'll often deduct TDS (income-tax, typically under 194J/194C) before paying you. So your ₹1,18,000 invoice might land as less in your account, with the balance sitting as TDS credit you reconcile at income-tax time.
Designers panic when the payment comes short and assume the client shorted them. Usually it's just TDS, and it's your money, it shows up in your Form 26AS and you claim it. Know the difference so you're not chasing phantom shortfalls. The basics are in TDS for interior designers.
Filing rhythm and staying sane
Once registered, you're on a rhythm, monthly or quarterly GSTR-1 (your sales) and GSTR-3B (summary and tax payment), plus an annual return above a turnover limit. The compliance itself is your CA's job. Your job is to feed them clean data: correct invoices, tracked advances, captured input bills, no gaps in the number series.
Where studios bleed time is at month-end, stitching all this together from WhatsApp, Excel, and a shoebox of vendor bills. That's the part software should just handle. In Designa, your quote becomes a proper GST invoice with the right SAC, sequential numbering, place of supply, and separated tax heads automatically, advances get logged against the project, purchase orders to your vendors sit in the same system so input bills don't go missing, and the whole thing syncs to Tally and Zoho Books so your CA isn't chasing you. You can even send the invoice and collect via Razorpay in a couple of clicks, I walk through that flow in how to send GST invoices and collect payment via Razorpay.
The short version
Register once you cross ₹20 lakh or the moment you go inter-state or want input credit. Charge 18% on design fees, and keep goods and execution as separate line items. Get the invoice fields right or your client won't pay. Pay GST on advances when you receive them, not when you finish. And guard your input credit like it's cash, because it is.
Do this and GST stops being the month-end panic and becomes a background hum.
If you'd rather your invoicing, advances, purchase orders, and GST just work together instead of living in five different apps, that's exactly why we built Designa. It's ₹2,299 + GST a year for your whole studio, up to 10 members, with free onboarding and data migration and a 7-day money-back guarantee. Poke around the live demo at https://demo.designa.work, and when you're ready, grab the founding offer at https://go.designa.work. Then get back to designing.