A retention collection is not automatically new contract revenue
For FY 2025–26 / AY 2026–27, section 43CB of the Income-tax Act, 1961 requires the applicable construction-contract computation to include retention money in contract revenue. For a construction contract within section 43CB, recognition follows the percentage of completion method in accordance with the notified ICDS; the rule does not mean that the entire contract price becomes taxable immediately. Once an identified amount has already entered the appropriate earlier tax computation, its later collection must be reconciled so that the same revenue is not included again merely because cash arrives.
Read the applicable text: Income-tax Act, 1961: section 43CB Income Tax Department: construction and service contract computation.
Start with the earlier tax working, not just the receivable
Build a contract-wise opening retention schedule identifying the earning period, book recognition, tax recognition and amounts collected. A balance-sheet receivable does not prove that the amount was taxed. Conversely, absence of a current invoice does not prove that an amount is outside current contract revenue. Obtain filed computations and supporting contract workings before making an adjustment.
Separate current earnings from old collections
For every receipt, identify whether it settles earlier recognised revenue, current-period earned revenue or another component such as interest or a disputed claim. Preserve the retention certificate, customer settlement and bank allocation. Where current book income includes release of an amount previously included for tax, support the corresponding computation adjustment; where books only clear a receivable, do not deduct the same collection again from taxable profit.
Keep gross settlement and deductions visible
A customer may release retention after deducting a damages claim or another charge. Reconcile the full amount settled and net cash separately. The tax treatment of a deduction, waiver, bad debt or claim needs its own conditions and evidence. Do not infer that every short payment is deductible or that every retention is permanently non-taxable because a contract remains disputed.
Reconcile cumulative recognition
A cumulative contract-revenue working can differ from current-period cash and invoices. Track prior recognised amounts so that the current-period calculation does not include the same cumulative amount twice. Changes in progress, entitlement and estimates require their own analysis. The examples use fictional recognition amounts assumed to satisfy the applicable method; they test collection and duplication controls rather than prescribe progress estimates.
Close the AY-specific bridge
Reconcile opening retention plus new retained amounts less settlements and other supported changes to closing retention. Separately reconcile current book income and current tax revenue. These are 1961 Act references for the stated earlier financial year; do not substitute Income-tax Act, 2025 section numbering merely because the return is filed after that Act commenced.
Six worked illustrations
All facts and amounts are fictional. Calculations illustrate the stated assumptions, not a predetermined legal outcome.
Illustrative example 1: Collection already recognised for tax
Opening retention is ₹40 lakh, of which records support earlier tax recognition of ₹36 lakh and leave ₹4 lakh unresolved. A ₹15 lakh collection is fully traced to the earlier recognised pool. Closing receivable is ₹25 lakh and the remaining identified earlier recognised pool is ₹21 lakh. The collection does not itself create a second ₹15 lakh revenue inclusion; resolve the ₹4 lakh separately.
Illustrative example 2: Book income includes mixed releases
A current book-income credit of ₹15 lakh comprises ₹10 lakh proven previously included for tax and ₹5 lakh independently established as current tax revenue. The duplication adjustment is ₹10 lakh on those assumptions, leaving ₹5 lakh in the current working. Removing all ₹15 lakh would omit the current component.
Illustrative example 3: Cash is below current earned revenue
Supported current contract revenue is ₹100 lakh, including ₹10 lakh retained by the customer, while current cash against that earning is ₹90 lakh. The ₹10 lakh difference is not excluded merely because withheld. The example assumes the recognition method independently supports ₹100 lakh.
Illustrative example 4: Cumulative revenue and mixed receipts
Supported cumulative revenue is ₹240 lakh and prior-period recognised revenue is ₹180 lakh, giving current revenue ₹60 lakh. Current receipts ₹80 lakh comprise ₹26 lakh old retention and ₹54 lakh against current earnings; ₹6 lakh current earnings remain retained. Neither ₹240 lakh nor ₹80 lakh is a substitute for the ₹60 lakh current recognition working.
Illustrative example 5: Net payment after a customer deduction
Earlier recognised retention ₹12 lakh is settled with ₹10 lakh cash and ₹2 lakh customer deduction. Reconcile all ₹12 lakh of the settlement. Do not recognise the earlier revenue twice, and assess the ₹2 lakh deduction separately rather than automatically treating it as an allowable expense.
Illustrative example 6: Missing earlier evidence
Three retention receipts total ₹20 lakh: ₹5 lakh, ₹7 lakh and ₹8 lakh. Earlier tax-recognition evidence presently supports ₹3 lakh, ₹7 lakh and ₹8 lakh respectively, totalling ₹18 lakh. The ₹2 lakh gap requires investigation; a twenty-lakh bank total does not establish twenty lakh of earlier taxed revenue.
Ten-step verification table
| Step | Action | Evidence |
|---|---|---|
| 1 | Identify each contract | Contract ID and retention terms. |
| 2 | Reconcile opening retentions | Prior closing ledger and customer records. |
| 3 | Trace earlier tax recognition | Filed computations and method working. |
| 4 | Trace current earned revenue | Supported current recognition schedule. |
| 5 | Allocate every collection | Bank entries and settlement certificates. |
| 6 | Separate book income from receivable clearance | Ledger posting evidence. |
| 7 | Review customer deductions separately | Claims, waivers and tax analysis. |
| 8 | Prevent duplicate adjustments | Amount-level book-to-tax bridge. |
| 9 | Reconcile closing retentions | Opening, additions and settlements. |
| 10 | Resolve unsupported balances | Evidence gaps and sign-off. |
Sixteen practitioner FAQs
1. Does section 43CB include retention in contract revenue?
Yes, under the applicable computation method.
2. Does that tax the whole contract immediately?
No. Determine timing under the applicable method and ICDS.
3. Is collection always fresh revenue?
Identify whether the amount was already recognised.
4. Does an opening receivable prove earlier taxation?
No. Inspect the earlier tax computation.
5. Can every retention receipt be deducted from current profit?
No. First establish its book treatment and earlier tax recognition.
6. What if books only clear a receivable?
Do not invent a second profit adjustment for that clearance.
7. What if books credit release income taxed earlier?
Support an amount-specific duplication adjustment.
8. Can cash received equal the current revenue figure by assumption?
Cash may mix earlier and current amounts.
9. Are gross settlements and net bank receipts identical?
Customer deductions can make them differ.
10. Is a damages deduction automatically allowable?
Apply its own legal conditions and evidence.
11. Does a disputed balance automatically escape tax?
Analyse entitlement, recognition and the relevant provisions.
12. Can cumulative recognised revenue be used again as current revenue?
Deduct the correctly established prior recognised portion in the cumulative working.
13. Does this article prescribe a completion percentage?
No. Recognition inputs are fictional assumptions; actual recognition must be independently supported.
14. What should happen to an unexplained prior-tax gap?
Resolve it before claiming an earlier-recognition adjustment.
15. Which Act’s numbering is used?
The Income-tax Act, 1961 for FY 2025–26 / AY 2026–27.
16. What closes the file?
Both the retention ledger and book-to-tax revenue bridge reconcile.
Official sources
Income-tax Act, 1961: section 43CB Income Tax Department: construction and service contract computation
CBDT Notification 87/2016: ICDS III (official Hindi Gazette text)
Income Tax Department: transition to the Income-tax Act, 2025