Sets the rate per contract
SAC, GST rate and place of supply, entered for each work order.
- SAC9954, works contract service9954
- GST rateAs configured for this contract18%
- Place of supplyMaharashtra, CGST and SGST
Rates as configured for your contract
Recoveries, GST and TDS for RA bills
Every line between gross value and net payable, set once per work order and worked out the same way on every bill, with the arithmetic shown.
Nine recoveries, set once per work order
Enter the contract’s terms when the work order starts. Each bill applies them in the order your client expects. Try the retention calculator
Recoveries · set once for this work order
| Recovery | How it is worked out | This bill ₹ |
|---|---|---|
| Retention | 5% of the value of work done, released after the defect liability period | 1,04,244 |
| Mobilisation advance | ₹1,50,000 a bill from RA 3 until recovered | 1,50,000 |
| Interest on advance | 15% a year on the ₹9,90,000 balance, one month | 12,375 |
| Secured advance | Adjusted as the steel brought to site is used | 2,40,000 |
| Client-issued material | Theoretical use against issue, excess at the penal rate | Nil |
| Labour welfare cess | 1% of the value of work done, as configured | 20,849 |
| Income-tax TDS | 2%, as configured for this contract | 41,698 |
| GST TDS | 2%, deducted by the government client | 41,698 |
| Liquidated damages | Entered by you from the client's order, never worked out | Nil |
Price variation by index formula
Enter the components, shares and base indices your contract gives, then the current indices each quarter. Each line is value of work done x share x the index change over the base.
Cement: ₹20,84,879 x 15% x (146.8 - 140.2) / 140.2 = ₹14,722.04, for a contract configured with these shares.
Price variation · this quarter
| Component | Share | Variation ₹ |
|---|---|---|
| Cement | 15% | 14,722.04 |
| Steel | 20% | -9,327.09 |
| Labour | 25% | 20,767.35 |
- Each line: value x share x (current - base) / base
- Price variation payable₹26,162.30
TDS and GST TDS, reconciled. Against Form 26AS, AIS and the GST portal.
| Bill | Income-tax TDS ₹ | In 26AS or AIS ₹ | GST TDS ₹ | On GST portal ₹ | Status |
|---|---|---|---|---|---|
| RA 4 | 32,805 | 32,805 | 32,805 | 32,805 | Matched |
| RA 5 | 36,252 | 36,252 | 36,252 | 36,252 | Matched |
| RA 6 | 39,108 | 39,108 | 39,108 | Not yet seen | GST TDS pending |
| RA 7 | 41,698 | Not yet due | 41,698 | Not yet due | Awaiting payment |
A contract configured at 2% income-tax TDS and 2% GST TDS. Upload the AIS or 26AS file and the GST TDS credit statement each month; mismatches are listed by bill.
The GST invoice on every bill. With the IRN where e-invoicing applies.
Registers the IRN
For taxpayers above the e-invoicing threshold, through the Invoice Registration Portal.
- IRN7d3c9a1f…5b02e41aValid
- AcknowledgementNo. 1126 1004 5521 873 · 3 Nov 2026
- Signed QR codePrinted on the invoice
Issues the tax invoice
Taxable value, tax and IRN printed on the invoice in the bill package.
Tax invoice RA-07/2026-27
- SAC, works contract service9954
- Place of supplyMaharashtra
- Taxable value, this bill20,84,879
- CGST, 9% as configured1,87,639
- SGST, 9% as configured1,87,639
- IRN7d3c…e41a
- Invoice value₹24,60,157
Who decides the TDS, GST TDS and cess rates?
You do, per work order, as configured for your contract and as your accountant advises. Tatha Vastu applies them the same way on every bill.
Does Tatha Vastu file GST or TDS returns?
No. It works out and records each deduction and reconciles it with what the portals show. Filing stays with your accountant.
Are liquidated damages worked out automatically?
No. LD and penalties are entered from the client's order, with its reference. They are never computed by the app.
Which TDS section numbers does it print?
The ones you set for the work order. With the Income-tax Act, 2025 in force from 1 April 2026, check the new section numbers with your accountant.
Can the price variation formula follow our contract?
Yes. Enter the components, their shares, base indices and the formula your contract states, commonly known as clause 10CC on CPWD contracts.