Social Impact Bond
Also written SIB · Social Impact Bond (SIB) · Social Impact Bonds · Pay For Success project
An impact bond in which the Government is the outcome funder, paying for verified social results; the UK pioneered it, the US calls it Pay For Success, and the workbook says India has yet to see one.
In plain language
A Social Impact Bond (SIB) uses exactly the same machinery as a Development Impact Bond:
- a risk investor funds a social programme up front;
- an independent evaluator checks whether agreed outcomes happened;
- an outcome funder repays the investor, with a return, only if they did.
The single difference is who the outcome funder is. In a SIB it is the Government.
The workbook puts it in one sentence: "India is yet to see examples where the Government steps in as an outcome funder, in which case these bonds would be referred to as social impact bonds (SIB)."
The logic of a SIB is that a government already pays for social problems — through prisons, hospitals and welfare. If a programme prevents some of that cost, the government can promise to pay for the result and let private capital carry the risk that the programme fails.
How it works
Structure — identical to a DIB except for the outcome funder:
| Role | DIB | SIB |
|---|---|---|
| Up-front capital, carries risk | Risk investor | Risk investor |
| Pays on verified outcomes | CSR donors, foundations, retail investors, or Government | Government |
| Measures outcomes | Independent evaluator | Independent evaluator |
| Arranges the deal | Intermediary / programme manager | Intermediary / programme manager |
Table 2.1 lists Government as a possible outcome funder, and as a possible intermediary. It is Government in the outcome funder seat that makes the bond a SIB.
International experience (Chapter 2):
- United Kingdom pioneered the SIB model, and its Government had a central role. Several UK outcome funds support multiple impact bonds, including the Innovation Fund, which supported 10 SIBs for education and employment of disadvantaged young people.
- United States — impact bonds are better known as Pay For Success (PFS) projects, and federal support has been important. The Social Impact Partnerships to Pay for Results Act (SIPPRA), passed in 2018, supports outcome-based financing and provides Treasury funding for social impact partnerships, including PFS projects.
- India — DIBs exist, such as the Quality Education DIB, but no SIB yet, per the workbook.
Where SIBs sit. Chapter 2 treats SIBs and DIBs together as the first form of pay-for-success structure. They suit the Social Impact Fund classification, and on the SSE a Social Impact Fund can act as the intermediary.
A worked example
A hypothetical Indian SIB — the workbook says none exists yet. All figures illustrative.
The problem. A state government spends heavily on a residential care scheme for children who drop out of school and end up in child-care institutions.
The SIB.
| Party | Who | Commitment |
|---|---|---|
| Outcome funder | The State Women and Child Development Department | Pays up to ₹4.4 crore over 4 years if outcomes are met |
| Risk investors | Two impact funds and a bank's impact desk | ₹4.0 crore up front |
| Implementation agencies | Three NPOs running family-strengthening programmes | Work with 2,000 at-risk families |
| Evaluator | Independent research agency | Compares institutionalisation rates against a baseline |
| Intermediary | A Social Impact Fund registered as an AIF | Structures the deal, possibly lists it on the SSE |
Outcome met — institutionalisation falls by the contracted amount. The state pays investors ₹4.4 crore: principal plus ₹40 lakh, a 10% total return over four years (about 2.4% a year compounded). The state pays only for success.
Outcome not met. The state pays little or nothing. Investors lose part of their ₹4 crore.
Put a CSR donor in the state's seat, with nothing else changed, and the same deal becomes a Development Impact Bond — the kind India already has.
Why NISM asks about it
Chapter 2 (2.3.1.1 and 2.3.1.2) introduces SIBs alongside DIBs. It defines the SIB by the Government being outcome funder, states that India is yet to see one, and gives the UK and US examples. Expect a direct "what is a DIB called when Government is the outcome funder" question, and statement-based questions on the UK Innovation Fund, the US PFS label and SIPPRA 2018.
Common exam traps
- SIB = Government as outcome funder. Not Government as risk investor, and not Government as implementer.
- India has DIBs but, per the workbook, no SIB yet. "India's Quality Education SIB" is a planted error — it is a DIB.
- The UK pioneered the SIB model. The UK Innovation Fund supported 10 SIBs.
- In the US, SIBs are called Pay For Success (PFS) projects, supported by SIPPRA (2018).
- A SIB is not a conventional bond. There is no fixed coupon; repayment depends on outcomes.
- Government can appear in Table 2.1 as outcome funder and as intermediary. Only the outcome-funder role defines a SIB.
- Possibly dated statement. "India is yet to see" a SIB is the workbook's statement in its July 2026 edition. Answer with it in the exam.
Check yourself
1.Three Party Relationship involving a social impact assessor, a responsible party and intended users is an element of:
- a)Social Intervention
- b)Social Project Monitoring Framework
- c)Social Impact Assessment Engagement
- d)Audit Evidence
Show the answer
Answer: (c) Social Impact Assessment Engagement
The five elements of a social impact assessment engagement are: three party relationship, social project scope, Social Project Monitoring Framework, evidence, and report.
The monitoring framework and evidence are themselves elements of the engagement — not the containers of the three-party relationship.
2.Under Regulation 91(D) of the SEBI LODR Regulations, a Social Enterprise must disclose an event that may have a material impact on planned outputs or outcomes not later than:
- a)24 hours from the event
- b)Seven days from the event
- c)30 days from the event
- d)60 days from the end of the financial year
Show the answer
Answer: (b) Seven days from the event
The disclosure must be made as soon as reasonably possible but not later than seven days from the occurrence of the event (or such period as SEBI specifies).
60 days is the deadline for NPO non-financial annual disclosures, not for events. 24 hours and 30 days do not appear in this chapter.
3.The seven principles of impact assessment described in the workbook are drawn from:
- a)ISO 26000
- b)ISO 19011
- c)GRI Standards
- d)NGRBC, 2018
Show the answer
Answer: (b) ISO 19011
Section 5.2 cites ISO 19011 — Guidelines for auditing management systems for the seven principles: integrity, fair presentation, due professional care, confidentiality, independence, evidence-based approach and risk-based approach.
ISO 26000 is Guidance on Social Responsibility, named as a sustainability standard and as a competency area.
Where this is taught
Free preparation for NISM Series XXIIIRelated terms
- Social Impact FundA Category I AIF investing primarily in social ventures and social enterprises, which satisfies the social performance norms laid down by the fund and may both take and give grants.
- Development Impact BondA results-based structure in which a risk funder finances an NPO up front and an outcome funder repays, with a small return, only if pre-agreed social metrics are independently verified.
- Pay-for-success structureA funding structure in which conventional capital earns a return only if social impact is demonstrably created, with social capital (CSR, foundations, impact investors) paying on success.