TurboTax seems to be using my AGI instead of the MAGI on Form 8960 Line 13. Is anyone else getting this error?

[machapman757]

Using the AGI (bigger number) instead of the MAGI (smaller number) is causing me to pay a larger Net Investment Income Tax.

[MarilynG1]

TurboTax calculates the 3.8% Net Investment Income Tax (NIIT) on Form 8960 by taking 3.8% of the lesser of your net investment income, or the amount your Modified Adjusted Gross Income (MAGI) exceeds specific thresholds ($200k single/head of household, $250k married filing jointly, $125k married filing separately), so is not using AGI or MAGI specifically. 

Here's more detailed info on Net Investment Income Tax.

@machapman757 

[dmertz]

@machapman757 , you are using the wrong calculation of MAGI.  The tax code has about a dozen different ways to modify AGI, one of which is used for each of the roughly two dozen different purposes in the tax code.  MAGI for the purpose of Form 8960 line 13 can never be lower than AGI, only higher, so the amount on line 13 of your Form 8960 is correct.

[machapman757]

Thanks. I'm slowly beginning to realize that MAGI means different things to different IRS forms.