Work through the property asset again in the Assets/Depreciation section. You will come to a screen titled "Tell us more about this rental asset". Select "I purchased this asset"
Below that select "No, I have not always used this item 100% of the time for business"
Then select "I used this item for personal purposes before I started using it in this business"
For "Date I started using it in this business" will be your in service date, which is typically the day a renter "could" have moved in.
Now the last question is "Percentage of time I used this item in this business in 2021". This is where the issue is. For your specific and explicit situation, the question is wrong. It should read "Percentage of floor space that is exclusive to the renter". I know you entered that percentage already on a previous screen. But enter the same percentage (of floor space) here. Then finish working it through. If the depreciation is not spot on what you figured manually it'll be within a few bucks, which is fine. On average, you shouldn't be off more than $2. But like I said, anything within $5 is fine.
This is one of those things that "must" be correct the first year. Otherwise, the amount of incorrect depreciation taken each year will become farther away from the correct amount each year. Then years down the road when you sell the property, the error will come back to bite, and will bite your wallet hard.
