Here’s FEC definition of an in-kind contribution:

Most people think of contributions as donations of money in the form of checks or currency. While these are common ways of making a contribution, anything of value given to influence a Federal election is considered a contribution. This section describes several forms of giving that are considered contributions under the Federal campaign law. All the contributions you make–whatever their form–count against your $117,000 biennial limit and your separate committee limits.

Donated Items and Services

The donation of office machines, furniture, supplies–anything of value–is an in-kind contribution. The value of the donated item (the usual and normal charge) counts against the contribution limits. A donation of services is also considered an in-kind contribution. For example, if you pay a consultant’s fee or a printing bill for services provided to a campaign, you have made an in-kind contribution in the amount of the payment.

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