You deduct your share of the cost, not the retail value. If you paid $1,000 out of pocket, then 89% of that would be the deduction. Be sure to keep all records, in case the IRS asks for you to prove what you paid. I feel sure your receipts would hold up in court to prove your basis.
The IRS requires a written appraisal for donated items over $5,000. The method of determining the value has several methods. See IRS Determining Value for additional help.
References:
Do I need a receipt?
[Edit 2/20/2024 |2:41 PM PST] @Fawnya
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