If you are a volunteer teacher, you may deduct your out of pocket expenses as a charitable contribution. This assumes that the books and DVDs, become property of the church. In TurboTax, enter as a cash deduction. This assumes you purchased the items specifically for the purpose of donating them to the church. Items that you were previously, would be treated as the donation of used items and not as cash.
If you keep ownership, you cannot deduct the cost for just loaning your personal items to the church. Your mileage is deductible if you are making a special trip to teach the class. You may not deduct the mileage if the class is just part of your Sunday morning attendance.
Charitable contributions are an itemized deduction, essentially with no limit. For 2020 only (Covid rules) an up to $300 cash deduction is allowed for those who use the standard deduction (non cash mileage would not be eligible).
