How do I add major improvement items to the cost basis of rental property sold?

[booth-keith]

I have owned the property for 28 years. Where do I add major costs (remodel, roof, etc.) to the cost basis?

[KrisD15]

Major improvements, such as a roof, are added as separate additional assets to the rental. 

They are then depreciated on their own.

When you sell, you allocate the sales proceeds to all remaining assets. 

In TurboTax, go to the rental section

Review your rental summary 

Select Edit for the rental property 

Scroll down to Assets/Depreciation 

Select "Add an Asset" 

IRS Pub 527