From Pub 561:
Generally, if the claimed deduction for an item or group of similar items of donated property is more than $5,000, you must get a qualified appraisal made by a qualified appraiser, and you must attach Section B of Form 8283 to your tax return. There are exceptions, discussed later. You should keep the appraiser's report with your written records. Records are discussed in Publication 526.
The phrase “similar items” means property of the same generic category or type (whether or not donated to the same donee), such as stamp collections, coin collections, lithographs, paintings, photographs, books, nonpublicly traded stock, nonpublicly traded securities other than nonpublicly traded stock, land, buildings, clothing, jewelry, furniture, electronic equipment, household appliances, toys, everyday kitchenware, china, crystal, or silver. For example, if you give books to three schools and you deduct $2,000, $2,500, and $900, respectively, your claimed deduction is more than $5,000 for these books. You must get a qualified appraisal of the books and for each school you must attach a fully completed Form 8283, Section B, to your tax return.
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