The Government of India’s own rule book tells its officers to avoid the cost plus contract. Under one, you are paid the actual cost of the work plus a fee, set as a percentage of that cost or as a fixed sum. Rule 225 of the General Financial Rules, 2017 says such contracts “should ordinarily be avoided”. In private work they appear where nobody can fix the scope in advance, and there the client carries the cost risk while you carry the burden of proving every rupee.

Most contractors meet a cost plus contract on a repair, a restoration, or a house where the owner keeps changing the plan. The deal sounds simple: spend, show the bills, add your margin. The disputes come later, over what counted as cost.

What a cost plus contract is

The General Financial Rules give the official definition. A cost plus contract is one in which the price payable is determined on the basis of the actual cost of production of the supplies or services, plus profit either at a fixed rate per unit or at a fixed percentage on the actual cost.

That gives two common forms:

  • Cost plus percentage. You are paid actual cost plus, say, 10% of it.
  • Cost plus fixed fee. You are paid actual cost plus a fee agreed at the start, which does not move with the cost.

Some private contracts add a ceiling, a maximum the client will pay, sometimes with any saving below it shared. That is a negotiated variant, not a separate legal form, and it only works if the scope is defined well enough to set a ceiling.

Why government work rarely uses it

Rule 225 of the General Financial Rules, 2017 (updated to January 2026) says two things about it. First, contract terms must not involve an uncertain or indefinite liability, except in a cost plus contract or one with a price variation clause. Second, cost plus contracts should ordinarily be avoided. Where one is unavoidable, full justification has to be recorded before it is signed, and on long-running supplies or work, the department should try to convert to a firm price once the contractor’s methods have settled.

The Manual for Procurement of Works 2022 repeats the uncertain-liability rule at para 5.7.6. Its list of the contract types mostly used runs to lump sum, item rate, percentage rate, piece work, EPC and PPP. Cost plus is not on it.

So if you bid for government civil work, you will almost always be on an item rate, percentage rate or lump sum basis. Our guides to the lump sum contract and to item rate vs percentage rate tenders cover those.

Cost plus contract vs lump sum vs item rate

Question Cost plus Lump sum Item rate
What fixes your price Actual cost plus a fee One quoted figure for the whole job Your rate for each item times the measured quantity
Who carries cost overrun The client You Shared: you on rates, the client on quantity
What you must prove Every cost, with bills and records That the work is done to scope Measured quantities
Where it fits Repair, restoration, unclear scope Clear, repeatable designs Most civil works

Percentage fee or fixed fee: a worked example

The figures below are an illustration, not market rates. Say a repair job is estimated at ₹40 lakh of actual cost, and the scope grows during the work until the actual cost is ₹50 lakh.

Fee basis Fee at ₹40 lakh cost Fee at ₹50 lakh cost
10% of actual cost ₹4 lakh ₹5 lakh
Fixed fee agreed at ₹4 lakh ₹4 lakh ₹4 lakh

Under a percentage fee, the extra ₹10 lakh of cost earns you another ₹1 lakh. That is exactly why clients and auditors distrust it: the contractor gains from a bigger bill. A fixed fee removes that pull, but if the scope grows a lot, you are doing more work for the same margin. If you accept a fixed fee, tie it to a defined scope and write in how it changes when the scope changes.

What counts as cost

Only what the contract says. This is the clause to read twice. A workable list names each cost head and how it will be proved:

Cost head How it is usually proved
Materials Supplier invoices and delivery challans
Labour Muster roll and wage sheets
Hired machines The hire invoice and a log sheet signed on site
Your own machines An hourly or daily rate agreed in the contract, plus the signed log sheet
Transport and site overheads Bills, and a stated list of what is an overhead

Items often excluded unless the contract says otherwise: head office overheads, interest and finance costs, penalties, and rework of your own defective work. If an item matters to you, write it in.

Your own machines are the line most often disputed. A client will accept a hire invoice from a third party, but your own excavator has no invoice. Agree its hourly rate in the contract, and have the log sheet signed daily by the client’s site representative. For a sense of what machines earn per day on hire in India, see our equipment rental rate card.

The records that get you paid

On a cost plus job, a cost you cannot prove is a cost you do not recover. Keep invoices and challans for every delivery, a muster roll, signed machine log sheets, fuel records, and a running cost statement shared with the client each billing period. Expect the client to ask to inspect your records, write that right and its limits into the contract, and keep the file ready for it.

Bill on a short cycle. A monthly cost statement with supporting papers settles disputes while the facts are fresh. A single bill at the end invites a line-by-line fight over months-old receipts.

If extra work is ordered on a fixed-price job instead, that is a variation, not cost plus; our guide to pricing a variation order covers it.

The bottom line

A cost plus contract pays actual cost plus a fee. It protects you from cost overruns when the scope is unclear, and the government rules discourage it for exactly that reason. Agree the cost heads, the fee basis and the rate for your own machines in writing, keep every record, and bill monthly.

When you are ready to price your next job, browse live tenders and project opportunities, and check equipment finance options if the work needs another machine.

Contract rules and procurement manuals change, and private contract terms vary. Confirm the terms of your own contract with the client, your contractor association or a lawyer before you sign.