No, do not adjust the amount yourself. TurboTax will do it if you enter all the information regarding your home loan. If you purchased the home before December 15, 2017 a $1 million limit applies, even if your most current loan is a refinance as long as you did not take cash out.
If that is not the reason your loan is not being limited, you may want to delete and re-enter Form 1098. When going through, check your answers to the questions regarding your loan, particularly Let's see if this is the most recent form for this loan. If you have a more recent 1098 for this loan, TurboTax only considers the outstanding loan in applying the mortgage limit.
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