Depreciation not calculated in 2015 tax forms while renting out room for 1 yr and lived there in other room. Sold property in 2021.

Trying to figure this out for 2021. Here are the details:

  • rented room Jan 2015 to Dec 2015 and lived there as primary residence. Made about $15k in rent
  • rented room for just 1 yr and lived there as primary residence for 10 yrs right before selling in 2021
  • filled out Schedule E and wrote the allowable expenses
  • did not calculate depreciation
  • Gain of $1k without including depreciation
  • Fast forward to 2021- sold the property. I guess I would have to recapture / repay depreciation that I did not claim- Right? Depreciation is @$20K for 2015
  • I can't amend as from 2015
  • Any other forms to fill out or does turbo tax walk me thru this and ask if I had any depreciation or missed any?