You would need to know what the maximum allowed credit is for the type of improvement you made to the property. For example, for an efficient central air conditioner, the maximum credit allowed is 30% of the cost up to $1200 maximum credit. So, if the unit was $5000, then the maximum credit would be $1200 (since 30% of $5000 is $1500, but the maximum allowed is $1200).
You can find those details in the IRS Instructions for Form 5695, or TurboTax may give you that information as you go through the program.
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