How to Deduct TDS on a GST Invoice: Should TDS Be Calculated Before or After GST?
Short answer: If GST is shown separately on the invoice, deduct TDS on the amount excluding GST. CBDT Circular No. 23/2017 (19 July 2017) says this for payments such as contractor, professional, and technical fees, commission, and rent, and Circular No. 13/2021 says the same for TDS on the purchase of goods under Section 194Q. If the invoice shows only a GST-inclusive total with no break-up, TDS is generally deducted on the full amount.
Every month, account teams stare at the same invoice: a base fee, GST at 18 percent, and a total. The question is simple, and a wrong answer is expensive. Deduct on the total and the vendor is short-paid; deduct on too little, and the payer faces interest and disallowance.
Sharda Associates is a CA-led firm that has prepared over 45,500 CA-certified project reports. Lenders and auditors read TDS and GST figures together, so we treat a correct TDS base as a basic hygiene point in a business's books.
This guide gives the rule, a worked example, the exceptions and the habits that prevent errors. It is general information. The Income-tax Act, 2025, has been in force from 1 April 2026 and renumbers the TDS provisions, so confirm the section references and current rates with your CA.
Should TDS Be Calculated Before or After GST?
Before GST, in the sense that the GST is left out of the base. The tax is deducted on the value of the service or goods, not on the GST collected on it, provided the GST is shown separately. The reasoning is that GST is a tax collected on behalf of the government, not income of the vendor, so deducting income tax at source on it would tax something that is not the vendor's income.
What Do the CBDT Circulars Say?
Circular No. 23/2017 (19 July 2017): where GST on services is indicated separately in the invoice, TDS under Chapter XVII-B is deducted on the amount excluding GST. Commentary applies this to Sections 194C, 194H, 194I and 194J.
Circular No. 13/2021 (30 June 2021): for Section 194Q, where tax is deducted at the time of credit and GST is indicated separately in the contract or invoice, tax is deducted on the amount without including GST.
A Worked Example
Here is an illustration with made-up figures. A professional fee invoice has a base fee of ₹1,00,000 and GST at 18 percent of ₹18,000. The rate of 10 percent is used only for illustration, so check the current rate for your payment.
The difference of ₹1,800 per invoice is why the break-up matters, and it adds up across many invoices.
Which Sections Does This Apply To?
What If GST Is Not Shown Separately?
If the invoice shows only a total, with GST included and no break-up, TDS is generally deducted on the entire amount. This is the cost of a poorly drafted invoice. The fix is on the vendor's side: issue a proper tax invoice that shows the base value and each GST head separately.
How Is TDS Under GST Different?
Do not confuse this with TDS under Section 51 of the CGST Act. That is a GST deduction made by notified government bodies and similar deductors on contract payments, and it is a separate compliance with its own returns. The income tax TDS discussed here is deducted by the payer under the Income-tax Act, whoever the payer is.
What Mistakes Are Common?
Deducting TDS on the GST-inclusive total even though GST is shown separately
Accepting an invoice with a combined figure and no tax break-up
Applying the wrong section to a mixed invoice for services and goods
Forgetting that deduction is due at the time of credit or payment, whichever is earlier
Depositing late, which brings interest
What Are the Consequences of Getting It Wrong?
Short deduction or non-deduction can lead to interest on the amount not deducted, and for non-deduction a part of the expense can be disallowed in the payer's accounts, generally 30 percent under Section 40(a)(ia) of the 1961 Act. The vendor can also lose the credit if the amount reported differs from what they expect in their Form 26AS.
Conclusion
The rule is straightforward: show GST separately, and deduct TDS on the base amount. Most errors come from invoices, not from the law, so the habit that matters is checking the break-up before the payment is released.
The simple routine is to check the invoice, identify the correct section, apply the current rate to the base value, deduct at the earlier of credit or payment and deposit on time. Do this consistently and the books, the returns and the vendor's Form 26AS stay aligned.
If you would like your TDS workings reviewed before the next quarter's return, call Sharda Associates on +91 89899 77769. Outcomes depend on the facts, so no result can be promised.
Frequently Asked Questions
1. Is TDS deducted on the GST amount?
Not where GST is shown separately on the invoice. TDS is deducted on the amount excluding GST.
2. Which circular says this?
CBDT Circular No. 23/2017 dated 19 July 2017, and Circular No. 13/2021 for Section 194Q.
3. What if the invoice shows a single total?
TDS is generally deducted on the whole amount. Ask the vendor for a proper tax invoice.
4. Does it apply to rent?
Commentary on the circular applies the principle to rent under Section 194I as well, where GST is shown separately.
5. Does it apply to purchase of goods?
Yes for Section 194Q, where GST is shown separately, per Circular No. 13/2021.
6. Who deducts TDS under GST?
Notified government bodies and similar deductors deduct it under Section 51 of the CGST Act. It is a separate compliance.
7. What is the time for deducting TDS?
At the time of credit or payment, whichever is earlier.
8. What happens if I deduct on the wrong amount?
There can be interest, short-deduction notices and disallowance, and the vendor's credit may not match.
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