GST TDS calculator for government contracts
Works out the GST TDS a government client deducts from your RA bill under Section 51 of the CGST Act, split into CGST and SGST or shown as IGST.
- Applies to
- Bills to government departments, local authorities and notified bodies
- Rates
- Set per contract
- Last checked
- 10 November 2026
Inputs and result. Every rate is yours to set.
Value of the supply, excluding GST.
2% is the example contract's configured rate, as Section 51 sets it.
₹2,50,000 as configured. Check the current notification.
GST TDS this bill
₹41,698
- CGST TDS₹20,849
- SGST TDS₹20,849
- Total deducted₹41,698
Rule applied. Under Section 51 of the CGST Act, 2017, government departments, local authorities and notified bodies deduct TDS of 2% (1% CGST plus 1% SGST, or 2% IGST) on the taxable value, excluding GST, where the total value of the contract exceeds ₹2,50,000. Check the current notification before relying on the rate or threshold.
Last checked 10 November 2026
The steps behind the figure
- Take the taxable value of the bill, excluding GST.
- Check that the contract value, excluding GST, is above the threshold.
- Multiply by the GST TDS rate configured for the contract.
- Split it into CGST and SGST for a supply within the state, or show it as IGST for one across states.
- Value of work done, this bill20,84,879
- Retention, 5%- 1,04,244
- Mobilisation advance recovery- 1,50,000
- Interest on advance- 12,375
- Secured advance adjusted- 2,40,000
- Labour welfare cess, 1%- 20,849
- Income-tax TDS, 2%- 41,698
- GST TDS, 2%- 41,698
- GST on the invoice, 18%+ 3,75,278
- Recoveries, 7 lines- 6,10,864
- Net payable₹18,49,293
Who deducts GST TDS?
Government departments, local authorities, government agencies and other bodies notified under Section 51 of the CGST Act. A private developer does not.
Is GST TDS on the value with GST?
No. It is on the taxable value, excluding the GST on the invoice.
How do I get the credit?
The deduction appears on the GST portal once the client reports it. Match each bill's deduction against it; Tatha Vastu keeps the per-bill figure for that check.