@user17578108386 ,
Absent paperwork ( real or soft records), you have to base your accumulated depreciation by best method that you can. Since you think that you have taken the same amount every year, just take the most recent depreciation and multiply by the number of years you have had this business going/operating. Using best effort to estimate generally will stand an audit ( if one comes your way). However, please keep good records of how you arrived at the number.
Yes this would mean that your basis in the property will be reduced by the accumulated depreciation and thus increase your gain. Also from the gain, that portion caused / traceable to the accumulated depreciation is treated as ordinary gain. The rest of the gain ( i.e. capital gain portion ) is now eligible for exclusion up to $250,000 per filer ( sale of main residence), if you meet the eligibility requirements.
Is there more I can do for you ?
