Yes, you may report your fostering expenses as Non-Cash Charitable Deductions on Schedule A, as long as the non-profit cat rescue has an IRS 501(c)(3) designation.
Fostering expenses eligible for deduction are food, medicines, veterinary bills, crates, garbage bags, and the like. Even a portion of your utilities can be considered expenses as long as a a specific area of your home is only used for the care of the animals and nothing else.
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