Can one federal grant serve as a match for another federal grant?

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Can one federal grant serve as a match for another federal grant? Are there basic rules regarding match requirements for federal funds or is it on a case by case basis?

Generally, you cannot use money that originated at the federal level as matching funds for another federal grant program. However, each federal agency grant program has its own rules and regulations. Read the instructions of the funding source and if it is not clear, make a call to the program officer.