Identify the common debt and the amount paid
Under section 146 of the Indian Contract Act, 1872, co-sureties for the same debt or duty contribute equally in the absence of a contrary contract, whether their guarantees are joint or several, under the same or different contracts, and whether or not they knew of each other. Section 147 preserves equal contribution so far as the limits of their respective obligations permit. This is an internal allocation after payment and does not set the creditor's enforcement rights.
Read the applicable text: India Code: Indian Contract Act, 1872, sections 146 and 147.
Check the scope before using the formula
Compare the debtor, creditor, covered facility or duty, covered advances, time period and liability triggers. Isolate the amount the creditor actually applied to the common debt after debtor payments and any other credits. Payments on an unrelated debt or outside another guarantor's scope do not become common merely because the company names coincide.
Allocate equally subject to individual limits
For a debt covered by all the relevant co-sureties, start with the common amount already discharged by one or more sureties after applying debtor payments and other credits. Divide that amount equally, subject to the caps. An outstanding balance still owed to the creditor is not itself a reimbursement claim among co-sureties. Where a share exceeds a cap, fix that surety at its cap and repeat the division of the remaining pool among the uncapped sureties. If all caps are exhausted, stop and separately analyse the residual. The statute's own illustrations show the result with equal and unequal limits.
Move from target shares to reimbursement
Subtract each surety’s payments on the common debt from its target share. A positive difference is an unpaid contribution; a negative difference is an overpayment to reconcile. A paying surety claiming contribution should identify its own share and show the other sureties' remaining shares, without asking for amounts already paid or credited. Where payments came at different times, reconcile them to one dated creditor statement.
Handle disagreements and heterogeneous coverage
Read any inter-surety agreement or contrary allocation before using the default. Check whether caps include interest or costs and whether the claim being modelled falls within them. Where caps cover different tranches, resolve the overlapping obligations before using a single allocation pool. Insolvency, releases, settlement terms, enforcement and limitation require separate analysis and are outside the calculations below.
Six worked illustrations
All facts and amounts are fictional. Calculations illustrate the stated assumptions, not a predetermined legal outcome.
Illustrative example 1: Three equal shares after a debtor payment
A company owes ₹30 lakh; the debtor pays ₹6 lakh. A pays the remaining ₹24 lakh under a guarantee. With three equally liable uncapped sureties, each bears ₹8 lakh; A's internal claims against B and C total ₹16 lakh.
Illustrative example 2: One cap binds
A, B and C have caps of ₹4 lakh, ₹12 lakh and ₹22 lakh on the same debt. C pays ₹21 lakh. A bears ₹4 lakh; the remaining ₹17 lakh divides into ₹8.5 lakh each for B and C. C's contribution claim totals ₹12.5 lakh.
Illustrative example 3: Two caps bind
Caps are ₹5 lakh, ₹7 lakh and ₹30 lakh. C pays ₹27 lakh. A bears ₹5 lakh, B ₹7 lakh and C ₹15 lakh. C seeks ₹12 lakh in total.
Illustrative example 4: Different caps, none binding
Caps are ₹9 lakh, ₹15 lakh and ₹30 lakh. B pays ₹21 lakh. Each share is ₹7 lakh, so B can seek ₹7 lakh from each of A and C, subject to the facts and terms.
Illustrative example 5: Prior payments credited to common debt
A, B and C have equal shares of ₹9 lakh on a ₹27 lakh common debt. A paid ₹18 lakh, B ₹3 lakh and C ₹6 lakh. After credits, A seeks ₹6 lakh from B and ₹3 lakh from C.
Illustrative example 6: Contract displaces the default
A valid agreement among three sureties allocates their ₹20 lakh common payment pool 50%, 30% and 20%, and their caps permit it. Their shares are ₹10 lakh, ₹6 lakh and ₹4 lakh. If A paid all ₹20 lakh, the other two shares total ₹10 lakh.
Ten-step verification table
| Step | Action | Evidence |
|---|---|---|
| 1 | List the debtor, creditor and common facility | Facility agreement and account number |
| 2 | Collect executed guarantees and amendments | Signed instruments and effective dates |
| 3 | Test whether the guarantees cover the same debt or duty | Facility-by-guarantee matrix |
| 4 | Identify any contrary contribution terms | Executed inter-surety agreement |
| 5 | Document covered principal, interest and costs | Demand and scope memorandum |
| 6 | Reconcile debtor and surety payments | Creditor statement and bank proof |
| 7 | Apply equal allocation and binding limits | Cap and share worksheet |
| 8 | Credit each surety for its earlier payments | Payment-by-surety ledger |
| 9 | Isolate disputed amounts and separate claims | Exceptions schedule and legal review |
| 10 | Issue the internal calculation with evidence | Dated reconciliation and source documents |
Sixteen practitioner FAQs
1. Must co-sureties sign the same instrument?
No. Section 146 can apply across separate instruments covering the same debt or duty.
2. Must they have known of one another?
The statutory default does not require it.
3. Does a common debtor alone prove a common debt?
No. Compare facilities, advances and each guarantee's operative scope.
4. Is the largest guarantor's internal share always the largest?
No. If no cap binds, the statutory default is equal contribution.
5. Can one capped surety be asked for more internally?
Section 147 limits the default contribution calculation by the surety's obligation.
6. Does the lender have to apply these internal shares when making a demand?
No. Determine creditor rights under the contracts and applicable law separately.
7. Does a debtor part-payment affect the model?
Use creditor evidence to determine the remaining common amount actually covered and paid.
8. Should the model use the full facility sanction?
Use the supported liability and payments in scope, not the sanction ceiling alone.
9. Can the parties set different sharing terms?
Section 146 allows a contract to the contrary. Verify its scope, parties and enforceability.
10. What if the cap is stated for principal only?
Read the instrument for interest and costs; do not apply a single assumed all-in cap.
11. Do debtor and surety recoveries belong in one total?
Track their character and application separately and avoid claiming money already recovered.
12. How should several paying sureties be treated?
Reconcile payments before comparing each amount borne with its target share.
13. What if the common debt exceeds all caps combined?
Do not allocate above the modelled limits. Analyse the remainder independently.
14. What if one guarantee only covers a later advance?
Identify overlap by advance. A single common pool may be wrong.
15. Can an accounting journal alone establish actual payment?
Obtain bank proof and the creditor's confirmation or ledger application.
16. What if a co-surety disputes release or limitation?
Keep the arithmetic separate from enforceability and review the actual documents and chronology.