What a price variation clause does
A works contract is priced on the day the bid goes in, but the work is paid for over months or years. A price variation (PV) or escalation clause shares the risk of later price movements between the owner and the contractor. Instead of the contractor building a guess about inflation into every rate, the contract adjusts each period's payment by how far published price indices have moved since a fixed base date.
The adjustment works both ways in most government contracts: when an index rises, the contractor is paid more; when it falls, the owner recovers the difference. A clause that only pays increases is unusual, so do not assume it.
The index formula
Almost every PV clause in India uses the same structure. The value of work done in the period is split into components, each with a fixed share and an index. For each component:
Adjustment = W × P% × (Ci − Co) ÷ Co
- W: the value of work done in the period that the clause makes eligible.
- P%: the component's share of the value, fixed in the contract (for example cement 10%, labour 25%).
- Co: the base index, for the base month the clause defines.
- Ci: the current index, for the period being adjusted.
Total escalation is the sum across components. Whatever share is not given to any component is the fixed portion and is never adjusted. The price escalation calculator applies exactly this formula; you enter the shares and indices from your own clause.
CPWD clause 10CC
Clause 10CC of the CPWD General Conditions of Contract 2023 is the model many departments follow. Its main features:
- Applicability. The NIT approving authority marks clause 10CC as applicable or not applicable in Schedule F for each work. Where it is not applicable, clause 10C applies instead, which only covers increases caused directly by a fresh law, statutory rule or order (not changes in GST rates).
- Period covered. Only work done during the stipulated period, including any justified extension under clause 5 granted without action under clause 2. Work done in a period of delay on the contractor's account does not earn escalation.
- Base date. The last stipulated date of receipt of tenders, including any extension of that date.
- Intervals. Worked out quarterly on bills paid in the three calendar months of the quarter. The date the contractor submitted the bill decides which quarter a bill falls in.
- Value adjusted. M = gross work done in the quarter + secured advance paid less recovered + advance payment paid less recovered − amounts paid at market rates for deviations under clause 12. Escalation is worked on W = 0.85 × M.
- Downward adjustment. If prices or wages fall, the same formula gives a recovery.
- Shares. The percentage for each component is fixed for each work in Schedule F, and the Engineer-in-Charge's decision on it is binding.
Components and index sources
| Component | Index under CPWD clause 10CC | Published by |
|---|---|---|
| Cement | WPI, Pozzolana cement | Office of the Economic Adviser (eaindustry.nic.in) |
| Steel reinforcement | WPI, mild steel long products | Office of the Economic Adviser |
| POL (diesel) | WPI, high speed diesel | Office of the Economic Adviser |
| Bitumen | WPI, bitumen | Office of the Economic Adviser |
| Other civil materials | Price index for civil components of other construction materials | CPWD, office of CE CSQ (Civil) |
| E&M materials | Price index for E&M components | CPWD, office of CE CSQ (Electrical) |
| Labour | Minimum daily wage of an unskilled adult mazdoor, the higher of the central and local notification for the place of work | Ministry of Labour and the state or local administration |
For the WPI components, CPWD takes the arithmetic average of the three months of the quarter. For labour, the current figure is the minimum wage on the last date of the quarter before the one being adjusted, and only the unskilled rate is used, whatever the mix of labour.
Other contracts often index labour to the Consumer Price Index for Industrial Workers (CPI-IW) published by the Labour Bureau, and materials to the WPI all-commodities series. State PWD, NHAI, railway, PSU and FIDIC-based contracts each name their own series, base month, averaging and factor. When a series is rebased, the publishing office gives a linking factor; use the method your clause or the department specifies.
Worked example on CPWD lines
Illustrative figures for one quarter. The index values are made up for the example; they are not published numbers.
- Gross work done in the quarter: ₹1,00,00,000. No advances and no clause 12 market-rate items, so M = ₹1,00,00,000 and W = 0.85 × M = ₹85,00,000.
| Component | Share | Base index | Current index | Change | Adjustment (₹) |
|---|---|---|---|---|---|
| Cement | 10% | 130 | 136.5 | +5% | 42,500 |
| Labour (minimum wage, ₹ a day) | 25% | 700 | 735 | +5% | 1,06,250 |
| Other civil materials | 30% | 150 | 156 | +4% | 1,02,000 |
| Steel | 15% | 150 | 141 | −6% | −76,500 |
| POL | 5% | 160 | 152 | −5% | −21,250 |
| Total escalation payable | 1,53,000 | ||||
The components add up to 85% of the value; the other 15% is fixed. Each line is ₹85,00,000 × share × change: cement ₹85,00,000 × 10% × 5% = ₹42,500, and so on. The same figures in the calculator, with "portion of value adjusted" set to 85%, give the same ₹1,53,000.
Getting the base date and indices right
- Base month. Under CPWD it is the month of the last stipulated date of receipt of tenders, including extensions. If the bid date was extended, the base moves with it. Other contracts may use the bid month, a month before it, or the date of acceptance.
- Provisional and final indices. WPI figures are first released as provisional and revised later. Decide, and record, whether you bill on provisional figures and adjust once final figures are out.
- Which item. "Steel" can mean several WPI items. Use the exact item the clause names.
- Delay periods. Some clauses, including CPWD's, freeze or deny escalation for delay on the contractor's account. An extension decision that records the cause of each delay protects your escalation as well as your LD position.
Preparing a PV claim
- List the bills submitted in the quarter by submission date, with gross value and advance movements.
- Deduct items not eligible: extra items at market rates, materials issued by the department, and anything else the clause excludes.
- Apply the factor (0.85 under CPWD) to get W.
- Download the indices for the base month and the quarter, keep copies of the published tables, and average them as the clause says.
- Compute each component and the total, and show negative components; a claim that leaves out the falls will be corrected.
- Submit with the extension of time status for the period, since that decides eligibility.
Escalation is part of the contract price, so GST applies to it at the rate on the works contract, and the deductor will deduct income-tax TDS under s.393 [194C] and, for government buyers, GST TDS on it like any other bill. See GST on works contracts and the RA bill deductions calculator.
K-Projects keeps the checked measurement book and RA bill abstracts with dates for each bill, which gives you the quarter-wise value of work done that a PV claim starts from.
Common questions
What is the base date for escalation under CPWD clause 10CC?
The last stipulated date of receipt of tenders, including any extension of that date. The base index is the one valid for that month.
Why is escalation worked on 85% of the work done?
Clause 10CC sets the cost of work for escalation at W = 0.85 × M, where M is the quarter's gross work done adjusted for advances and market-rate deviation items. Other contracts may use a different factor or none.
Which index is used for labour?
CPWD clause 10CC uses the minimum daily wage of an unskilled adult mazdoor, the higher of the central and local notification for the place of work. Many other contracts use the Consumer Price Index for Industrial Workers published by the Labour Bureau. Use the one your clause names.
Is escalation paid for work done after the completion date?
Under clause 10CC, only for work done in the stipulated period and any justified extension under clause 5 granted without action under clause 2. Work done during delay on the contractor's account is not covered. Other contracts differ.
Can the owner recover money if prices fall?
Yes, under most government clauses, including CPWD's. Clause 10CC provides for a downward adjustment by the same formula when prices or wages decrease.