TurboTax does not support IRS Form 8697, Interest Computation Under the Look-Back
Method for Completed Long-Term Contracts.
See this TurboTax support FAQ for forms not supported - https://ttlc.intuit.com/questions/2575105-which-irs-tax-forms-are-not-available-in-turbotax-personal...
IRS Form 8697 - https://www.irs.gov/pub/irs-pdf/f8697.pdf
IRS Form 8697 instructions - https://www.irs.gov/pub/irs-pdf/i8697.pdf
