Edit your self-employed business, and make sure you correctly answered the TurboTax Home and Business interview questions in the Business Assets section to enter your constructed asset. One of the questions is "Did you make improvement to a building you used for this business in 2019". Assuming this fits your situation, follow the prompts to enter your construction expenditures. If not, when you answer "No", on the next screen choose "Real Estate Property" and enter the date the construction was "placed in service", i.e., when it was finished and started to be used. On the next screen, select "Qualified Improvement Property". The designation as Qualified Improvement Property (assuming it meets the definition) is critical; Section 179 treatment for leasehold improvements is new starting in 2018. TurboTax will guide you the rest of the way.
Your constructed asset is not an intangible asset, so if you entered it that way you will need to delete that asset and enter your asset correctly.
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