Tax write off for turning unit

[Breelon Bryant]

Hey everyone. I am currently turning a unit and doing some minor repairs to my first unit to get it rent ready for my next tenant. Its only going to cost about 3k to get everything done. I have a contractor, who is amazing by the way, finishing up the work. My question is how or what do I need to do to make sure I can write off the 3k I am paying him on my taxes for 2020? Any specific documentation?