Instead of overriding the form, try going through the Net Investment Income Tax interview again. Watch for a screen that asks, “Do you have any additional modifications or deductions for Form 8960?” You can usually enter a manual adjustment there, which will flow to Line 9b and keep the electronic links intact.
Property taxes on Line 9b are now directly supported by the instructions. As long as you have documentation—like Schedule A showing the paid taxes—and a reasonable method for your allocation percentage, this entry is considered low risk.
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