Quote from @Edward Adams:
Hi
i just changed the roof on one of my rental properties. it cost 18K and insurance paid for it and i only paid 1.5K for deductible. do i just depreciate the 1.5K on my tax return or 18K?
No. You do not need to depreciate it.
This amount falls under the safe harbor methods of 1.263-1.
If under 2,500 you can deduct the amount.
Make sure you attach a de minimis safe harbor statement.
https://www.irs.gov/businesses/small-businesses-self-employe...
What is the de minimis safe harbor election?
Under the final tangibles regulations, you may elect to apply a de minimis safe harbor to amounts paid to acquire or produce tangible property to the extent such amounts are deducted by you for financial accounting purposes or in keeping your books and records. If you have an applicable financial statement (AFS), you may use this safe harbor to deduct amounts paid for tangible property up to $5,000 per invoice or item (as substantiated by invoice). If you don't have an AFS, you may use the safe harbor to deduct amounts up to $2,500 ($500 prior to Jan. 1, 2016) per invoice or item (as substantiated by invoice).
These limitations are for purposes of determining whether particular expenses qualify under the safe harbor; they aren't intended as a ceiling on the amount you can deduct as business expenses under the IRC.
The de minimis safe harbor election does not include amounts paid for inventory and land. Additionally, it does not apply to rotable, temporary, and standby emergency spare parts that the taxpayer elects to capitalize and depreciate under § 1.162-3(d). It does not apply to rotable and temporary spare parts that the taxpayer accounts for under the optional method of accounting under § 1.162-3(e).
Neither the IRC nor prior regulations included a de minimis safe harbor exception to capitalization; you were required to determine whether each expenditure for tangible property, regardless of amount, was required to be capitalized. The de minimis safe harbor election eliminates the burden of determining whether every small-dollar expenditure for the acquisition or production of property is properly deductible or capitalizable.