There is no maximum amount allowed for a single item given to charity.
No, you do not need an appraisal for the brand new King mattress because the donated value is under $5,000. However, you will need to fill out Form 8283 for a non-cash donation over $500.
Click here for instructions on entering your mattress donation in TurboTax: How to Enter Charitable Contributions in TurboTax.
You can also see this video link for more info - Deducting Charitable Contributions.
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