TLDR
Cost share is the non-federal portion of a project's total allowable cost. Voluntary committed cost share — match offered in the application beyond what is required — becomes legally binding once written into a federal award. Most organizations don't realize this until they're in an audit.
Cost share is the non-federal portion of total allowable project cost that a grant recipient contributes. It may be mandatory — required by the award — or voluntary and committed, offered in the application. Both types become binding once written into a federal award agreement. Voluntary committed cost share is where most organizations get caught.
How it works
Federal cost share requirements exist to ensure that grantees have a genuine stake in a project’s outcomes. The contribution is expressed as a percentage of total project cost, a ratio of non-federal to federal dollars, or a fixed amount. All three formats appear regularly in federal Notices of Funding Opportunity.
Acceptable forms of cost share under 2 CFR 200.306 include:
- Cash contributions — direct expenditures from non-federal accounts: staff payroll, vendor invoices, operating expenses. The most straightforward form; requires ledger documentation.
- In-kind contributions — volunteer labor valued at documented fair market rates, donated goods valued at current market price, donated space valued at a documented fair rental rate. Requires contemporaneous logs and valuation documentation.
- Third-party contributions — cash or in-kind from other non-federal sources that are committed to the project. Private foundation grants, state appropriations, and community donations can serve as third-party cost share.
Every form of cost share must meet the same five requirements: verifiable from grantee records, necessary and reasonable for the project, allowable under applicable cost principles, not from another federal award (without statutory exception), and included in the approved budget.
When it applies
Cost share applies when a federal award agreement — whether from a direct federal program or a pass-through entity — specifies a match requirement. The requirement is triggered at two points:
Application stage. Mandatory cost share requirements appear in the NOFO. Organizations decide at this point how they will meet the requirement and document that plan in the budget narrative.
Award stage. Once the award is signed, both mandatory and voluntary committed cost share become legally binding. This is when voluntary cost share becomes a compliance obligation — not a proposal convenience.
Common misconceptions
Voluntary committed cost share is not optional after award. This is the most consequential misunderstanding in cost share compliance. A nonprofit that offers additional match in an application to strengthen its score, and then receives the award, must document and achieve that additional match at the same compliance standard as mandatory match. Shortfalls are audit findings with the same consequences.
Federal pass-through funds cannot serve as match. An organization receiving a state-administered CDBG grant cannot use those federal dollars to match a HOME grant. Even when the federal origin of the state funds is obscured in the funding flow, auditors trace source documentation.
In-kind match is not less rigorous. Organizations sometimes treat in-kind match as a softer requirement because there is no cash transaction. Auditors test in-kind match the same way they test direct cost claims: they look for contemporaneous documentation, fair market valuations, and consistency with the approved budget.
A shortfall in cost share is not just a documentation problem. If cost share contributions were genuinely not made at the required level, the federal agency may reduce the award proportionally. This is not remediated by better record-keeping after the fact.
Related terms
- Matching funds — the same concept; the terms are used interchangeably in grants management.
- In-kind contribution — non-cash cost share from volunteer labor, donated goods, or facility use.
- Voluntary committed cost share — match beyond required minimum that becomes binding on award execution.
- Unallowable costs — costs that cannot count toward cost share because they violate 2 CFR 200 cost principles.
- Questioned costs — what undocumented or non-compliant cost share becomes in a single audit finding.
How GrantPipe handles cost share
GrantPipe tracks mandatory and voluntary committed cost share separately within each grant record. At award setup, the required match amount and type are entered alongside federal award terms. As costs are posted and in-kind contributions logged, the system calculates the running match percentage and flags gaps against the required amount. Before each reporting period, Finance Directors see exactly where they stand — so a shortfall is addressed during implementation, not discovered in an audit.
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- Mandatory cost share
- Cost share required by the program statute, Notice of Funding Opportunity, or award agreement. Non-compliance is a compliance finding regardless of the organization's financial situation.
DEFINITION
- Voluntary committed cost share
- Cost share beyond the required amount that an organization includes in a grant application — often to improve competitiveness. Once in the award agreement, it becomes binding and subject to the same compliance requirements as mandatory cost share.
DEFINITION
- In-kind contribution
- Non-cash cost share in the form of volunteer labor, donated services, goods, or facility/equipment use. Must be valued at fair market rates and documented contemporaneously.
DEFINITION
- Non-federal source requirement
- The requirement under 2 CFR 200.306 that cost share not come from another federal award unless the applicable statute expressly authorizes it. This is the most frequently violated cost share rule.
DEFINITION
Q&A
What is cost share in a federal grant?
The portion of total allowable project cost contributed by the grantee from non-federal sources. It may be mandatory (required by statute or award) or voluntary and committed (offered in the application). Both types are binding and auditable under 2 CFR 200.306.
Q&A
What is the difference between mandatory and voluntary cost share?
Mandatory cost share is required by the program statute or Notice of Funding Opportunity. Voluntary committed cost share is additional match the organization offers in the application — not required, but binding once written into the award agreement.
Q&A
Can in-kind services count as cost share?
Yes. Volunteer labor, donated goods, equipment use, and facility space can all count as in-kind cost share when documented at fair market value and meeting the requirements of 2 CFR 200.306.
Q&A
What happens if cost share falls short?
A cost share shortfall is a compliance finding in a single audit. The federal awarding agency may reduce the federal award proportionally — meaning a grantee that contributed 15% instead of 20% match may owe back 5% of federal funds received.
Q&A
Does cost share have to be documented the same way as direct costs?
Yes. Cost share must be verifiable from grantee records using the same standards as direct cost expenditures. Cash cost share requires ledger documentation; in-kind requires contemporaneous logs and fair market valuations.
Frequently asked