Section 43CB: Computation of Income from Construction and Service Contracts

1. What does Section 43CB provide?

Section 43CB(1) requires profits and gains arising from a construction contract or a contract for providing services to be determined using the percentage of completion method, in accordance with the ICDS notified under Section 145(2) of the Income-tax Act, 1961. This is a rule for computing taxable business income, not necessarily the same as financial statement recognition under accounting standards.

Section 145(2) empowers the Central Government to notify income computation and disclosure standards for specified classes of assessees or income. The application of those standards must be considered together with the relevant tax law and the applicable year.

Key definitions

• Construction contract: a contract specifically negotiated for construction of an asset or a combination of closely related or interdependent assets, as addressed in ICDS III.
• Service contract: a contract for rendering services, with recognition governed by Section 43CB and the relevant ICDS provisions.
• Percentage of completion method (POCM): recognition of contract income with reference to the stage of completion rather than waiting for the entire contract to finish.
• Retention money: part of the contract price withheld by the customer pending specified milestones or performance conditions.

2. Methods for recognising contract income

The exceptions in the proviso concern service contracts; they should not be assumed to apply to construction contracts merely because a project is short.

Percentage of completion

Income is attributed to work performed during the relevant period based on the stage of completion determined under the applicable ICDS. The calculation must use supportable measures and take account of the relevant rules on contract revenue, costs and expected losses.

Project completion for short service contracts

Where a service contract has a duration of not more than 90 days, the proviso specifies project completion recognition. Whether a particular arrangement is one contract or several contracts depends on its actual terms and substance.

Straight-line recognition

For a service contract requiring an indeterminate number of acts over a specified period, income is recognised on a straight-line basis over that period, rather than by counting each individual act.

3. Retention money and incidental income

Section 43CB(2)(i): contract revenue includes retention money for the purpose of the recognition methods specified in Section 43CB. Retention cannot automatically be excluded solely because the customer will release it later.

Section 43CB(2)(ii): contract costs must not be reduced by incidental income in the nature of interest, dividends or capital gains. Such income should be assessed under its appropriate tax treatment instead of being netted against the contract cost.

These provisions should be read alongside the detailed rules of ICDS III (Construction Contracts) and ICDS IV (Revenue Recognition), as applicable.

4. Practical examples of Section 43CB

Example A: Construction contract under percentage of completion

A contractor has a construction contract price of Rs. 2 crore. At year-end, the reliably measured stage of completion is 40%. On a simplified illustration, cumulative contract revenue attributable to the work completed is Rs. 80 lakh (Rs. 2 crore x 40%). If eligible contract costs attributable to the work are Rs. 64 lakh, the illustrative cumulative profit is Rs. 16 lakh. The current year's amount would be adjusted for revenue and costs recognised in earlier years and other applicable ICDS requirements.

Example B: Short service contract

A consulting assignment runs for 75 days and qualifies as a service contract within the proviso. Its income is determined on the project completion method rather than recognising revenue merely on elapsed days.

Example C: Continuous support service

A 12-month support contract for Rs. 12 lakh involves an indeterminate number of service acts throughout the year. Subject to the contract facts and applicable law, straight-line recognition illustrates Rs. 1 lakh per month.

These are simplified teaching examples, not substitutes for the detailed computation required by the relevant ICDS.

5. ICDS, accounting differences and compliance

ICDS rules are used to compute taxable income under the applicable provisions of the Income-tax Act. A business may need to reconcile its financial accounting treatment with its tax computation. Contract files should document agreed consideration, variations, costs incurred, estimated costs to complete, stage-of-completion measurements, retention amounts, invoices and the method consistently applied.

Section 43CB was inserted by the Finance Act, 2018, with retrospective effect from 1 April 2017. For periods governed by the Income-tax Act, 2025, consult that Act and its commencement and transitional provisions rather than assuming the old section number continues unchanged.

6. Frequently asked questions

7. Official legal and tax resources

For the operative statutory wording and amendments, consult the Income Tax Department, the Income-tax Act on the department's website, and India Code. Check the relevant Finance Act and notifications under Section 145(2) for the assessment year in question.

Related LawDadi guidance: Section 43 definitions and Section 43B deductions on actual payment.

8. Original statutory material and amendment note

The text below is retained from the earlier page for historical reference. Refer to official consolidated legislation for the wording applicable to a particular tax year.