A move-in / move-out inspection is a documented walkthrough of a rental unit, with dated photos and a checklist both parties sign, that records the condition of the place at the start and end of a tenancy. The two records exist for one reason: when the lease ends, the difference between them is the evidence behind any deposit deduction you make.
In practice
Say a tenant moves into a two-bedroom unit. At move-in you walk every room and log condition in writing: living-room carpet “clean, no stains,” kitchen wall “freshly painted,” bathroom door “no holes.” You take 24 timestamped photos, attach them to a checklist, and both of you sign and date it. Two years later the same carpet has a burn the size of a dinner plate and the bathroom door has a fist-sized hole.
Now the numbers work. The carpet had a useful life of 7 years and cost $1,400 installed, so 2 years in it had 5 of 7 years left. You can charge for the unused portion: $1,400 ÷ 7 = $200 per year, × 5 remaining years = $1,000. The door repair is a flat $180 quote from your handyman. You deduct $1,180 from the deposit, and the move-in photos prove both items were intact when the tenant took the keys. Without that first record, you are arguing “it was fine before,” which a small-claims judge will not credit.
Why it matters to a small landlord
The deposit dispute is where self-managers lose money they were owed, and it is almost always a documentation gap rather than a legal one. A signed move-in record turns “he said, she said” into a side-by-side comparison the tenant already agreed to. Build the habit the same way you would build any other part of your security deposit paper trail: photos, dates, a signature, and a copy each. When the tenancy ends and you draft the deposit return letter, every line item points back to a photo and a number, not a memory.
One more reason to keep it generic and thorough: some states require a written condition checklist or an inspection at move-out, and a few set deadlines for it. Read your own state's statute, but do the inspection regardless, because the paper protects you whether or not the law demands it.
The inspection is one bookend of the deposit; the other is the math. Learn what counts as normal wear and tear versus chargeable damage before you start deducting, and treat the inspection as the first step of turnover, right alongside the make-ready work that gets the unit rentable again.