The short version
A marketing invoice in India carries four numbers, and the quoted fee is only the first. Add 18 per cent GST on the fee. Subtract TDS at 1 or 2 per cent of the pre-GST value, which you deposit with the government rather than pay to the supplier. Then recover the GST as input tax credit, if your business is registered and making taxable supplies. On a ₹1,50,000 fee that means an ₹1,77,000 invoice, a ₹1,74,000 bank transfer, and a real cost of ₹1,50,000.
If you cannot claim input tax credit, the real cost is ₹1,77,000 and there is no version of the negotiation that gets it down. Two businesses can sign the identical contract at the identical rate and pay eighteen per cent apart.
The quoted fee is a fact about the supplier. Landed cost is a fact about you.
What the published price ranges actually tell you
The fee ranges in circulation are broadly consistent and broadly correct. Monthly retainers in India run from roughly ₹50,000 to ₹5,00,000 and above, with most businesses landing between ₹1,00,000 and ₹2,50,000 a month for a multi-channel programme, and percentage-of-spend arrangements typically at 8 to 15 per cent of the media budget. Those numbers come from the three most visible Indian pricing guides published in 2026, and they agree closely enough to be trusted.
What they describe is the supplier's rate card, which is a different thing from the transaction. One of those guides runs ten pricing sections including one titled "Hidden Costs to Watch For". Another carries a section called "Hidden Costs Businesses Overlook". Neither uses the word GST anywhere on the page. The tax that adds eighteen per cent to every invoice in the category is absent from the two documents specifically about costs people overlook.
This is not anyone hiding anything. It is a genre problem. Pricing guides are written by people who quote fees, and tax explainers are written by accountants for the people raising the invoice. The founder paying it sits between the two and gets neither.
GST is 18 per cent, and for most businesses it is not a cost
Advertising and digital marketing services attract GST at 18 per cent in India, under SAC 998363 for digital media and 998361 for print. That rate applies to the agency fee, to ad management, to creative, to retainers and to project work alike. There is no lower slab for marketing and no reason to expect one.
For a GST-registered business making taxable supplies, that 18 per cent is recoverable as input tax credit. You pay it on the invoice, you claim it against the GST you collect on your own sales, and the net effect on your profit and loss is nil. Three conditions have to hold: the spend is genuinely for the business, you hold a valid tax invoice showing the supplier's GSTIN and the correct SAC, and the credit shows up in your GSTR-2B because the supplier actually filed.
That third condition is where money is lost quietly. A credit that never appears in GSTR-2B is a credit you cannot take, and the reason is always on the supplier's side rather than yours. Reconciling it monthly rather than at year end is the difference between a phone call and a write-off.
When the 18 per cent is real money
If your business is not GST-registered, or it makes exempt supplies, or the marketing spend sits against a non-taxable line, the input tax credit is unavailable and the 18 per cent is simply cost. A ₹1,50,000 retainer costs you ₹1,77,000 a month, and ₹21,24,000 a year instead of ₹18,00,000. Establish this before you start comparing quotes, because it changes what you can afford by nearly a fifth, and your accountant can settle it in two minutes.
TDS: the reason the invoice and the bank transfer never match
You deduct tax at source on payments to an Indian marketing supplier and deposit it with the government under the supplier's PAN. Advertising is explicitly treated as "work" in the statutory definition, so it falls under the contractor provisions rather than the professional services ones. The rate is 1 per cent where the supplier is an individual or HUF, 2 per cent for a firm, LLP or company, and 20 per cent where the supplier has no valid PAN.
Thresholds are ₹30,000 for a single payment and ₹1,00,000 in aggregate across a financial year. Cross either one and the deduction applies, which any retainer worth discussing does inside the first quarter.
The detail that causes most of the arguments: where GST is shown separately on the invoice, TDS is calculated on the value excluding GST, because GST was never the supplier's income and was only ever collected on the government's behalf. On a ₹1,50,000 fee plus ₹27,000 GST, the 2 per cent comes off ₹1,50,000 and not off ₹1,77,000. Three thousand rupees, not ₹3,540.
None of this is a cost to you. The ₹3,000 leaves your account either way, it just goes to the Income Tax Department rather than to the supplier, who claims it back against their own liability. What it does affect is the conversation in month two, when a supplier who has not thought about it asks why they were paid short.
- Deduct on the fee, not on the fee plus GST, where GST is shown as a separate line.
- Confirm the supplier's constitution before the first payment: an LLP is 2 per cent, a sole proprietor is 1 per cent.
- Issue the TDS certificate on time. A supplier chasing Form 16A is a supplier not doing your work.
- Put the deduction in the contract in words, so the first short payment is expected rather than disputed.
From 1 April 2026, the section number changed
TDS on a marketing invoice is now deducted under Section 393(1) of the Income-tax Act 2025, not Section 194C of the 1961 Act. The new Act took effect on 1 April 2026 and consolidated the scattered non-salary TDS provisions into a single table-driven section. Contractor payments, which is where advertising sits, map to Section 393(1) at Table Sl. No. 6(i), and rates and thresholds carried over untouched.
What changed is every document that cites the old number. Contract clauses reading "TDS shall be deducted under Section 194C", invoice footers, accounting software templates and quarterly return filings now reference a repealed section. Returns have also moved to four-digit payment codes in place of section numbers, with contractor payments filed under code 1017. Administrative rather than financial, and the kind of administrative that produces a notice eighteen months later.
Ad spend, and which country your invoice comes from
Ad spend is not part of the fee and never sits inside a retainer. It is a separate line paid to the platform, and its GST treatment depends entirely on which legal entity bills you. The test is on the invoice itself: look for a 15-digit GSTIN and a tax line.
Billed by an Indian entity, the platform charges 18 per cent GST on the face of the invoice under forward charge and remits it. You claim it as input tax credit in the normal way. Billed by a foreign entity, the invoice shows no GST, the supply is an import of service, and you self-assess 18 per cent IGST under reverse charge and pay it yourself. For a registered business with full credit, reverse charge is a timing effect rather than a cost, because you claim back in the same period what you just paid.
One thing to get right regardless of entity: give the platform your GSTIN. An advertiser who never supplied one has been classified as a consumer rather than a business, and the invoice will not identify a registered recipient. The credit you were entitled to becomes very hard to defend at that point, and it is a settings-page fix that takes a minute.
TDS on ad platform payments deserves a caveat rather than a rule. Published guidance puts 2 per cent under the contractor provisions on payments to an Indian platform entity above the usual thresholds. In practice most ad accounts are prepaid by card or wallet, deduction at source is awkward against a prepayment, and Indian advertisers handle it inconsistently. Confirm the treatment with your accountant rather than taking any blog's word for it, including this one.
The 6 per cent that disappeared, and still shows up in quotes
The 6 per cent equalisation levy on online advertising was abolished by the Finance Act 2025, signed on 29 March 2025 and effective from 1 April 2025. Since 2016 it had applied to payments above ₹1 lakh a year made to non-resident advertising suppliers, it was withheld by the Indian payer, and unlike GST it was never creditable. That made it pure cost. Repealing it was reported as costing the exchequer more than ₹3,000 crore in FY 2025-26.
On ₹5,00,000 a month of foreign-billed ad spend, that levy was ₹30,000 a month, and it is now gone. Any budget model, cost-per-acquisition calculation or quote that still carries it is overstating your media cost by six per cent. Worth checking, because the repeal has not propagated evenly and widely read Indian tax explainers still list the levy in their foreign-billing comparison tables more than a year on. If a spreadsheet in your finance folder has a 6 per cent line against Google or Meta, it is out of date.
The whole thing, on one budget
Take a founder running ₹1,50,000 a month in fees and ₹5,00,000 a month in ad spend, working with a private limited supplier, and being billed by Indian entities throughout. That is ₹6,50,000 a month of visible spend and ₹78,00,000 a year.
GST across both lines is ₹1,17,000 a month, or ₹14,04,000 a year. TDS on the fee is ₹3,000 a month, deposited rather than paid. For a business registered and claiming credit properly, the annual landed cost is ₹78,00,000 and the ₹14,04,000 of GST is a cash-flow rhythm rather than an expense. Without that credit, the annual landed cost is ₹92,04,000.
Fourteen lakh rupees of difference on identical work at an identical rate, decided entirely by your own registration status and how well your supplier files their returns. That is a larger number than anything you will win by negotiating the retainer down, and it is settled before the negotiation starts.
- Fee ₹1,50,000 · GST ₹27,000 · invoice ₹1,77,000 · TDS ₹3,000 · transfer ₹1,74,000.
- Ad spend ₹5,00,000 · GST ₹90,000 · billed ₹5,90,000.
- Recoverable GST per month, if registered: ₹1,17,000.
- Annual landed cost, registered: ₹78,00,000. Not registered: ₹92,04,000.
Where this does not apply
None of it is tax advice, and the arithmetic above is arithmetic rather than a filing position. Registration status, the nature of your supplies, whether the spend is attributable to taxable output and which entity the platform bills you from all change the answer, and they change it per business. An accountant settles this in one conversation and is worth having before you sign anything, not after.
The other limit is proportion. Below roughly ₹50,000 a month of total marketing spend the compliance mechanics matter less than the fact that the budget is too small to buy a result in most categories. Getting the GST treatment perfect on a programme that was never going to work is precision applied to the wrong problem. Fix the size of the bet first.
And the tax position is not a reason to pick one supplier over another. Every registered supplier in India charges the same 18 per cent, so this changes what you can afford rather than who you should hire. The work is still the thing you are buying.
What to do before the next invoice
Ask your accountant one question: can this business claim input tax credit on marketing spend. The answer sets your real budget, because it is either an eighteen per cent discount on every quote you receive or it is not. Then check three things on the last invoice you paid. Whether the supplier's GSTIN and SAC are on it, whether the credit appeared in your GSTR-2B, and whether your GSTIN is saved in the billing settings of every ad account you run. That is an hour of work and it is worth more than an hour of negotiation.
Slate works as an embedded growth partner with a short list of founder-led brands, which is why this conversation tends to happen in week one rather than at the first quarterly review. The number a founder should be planning against is the landed one, and it is knowable on day one.