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I have the same question; according to the IRS:

"Au Pair wages are essentially in the nature of household employment."

...

"Au pair wages are not usually subject to social security and Medicare taxes because of the au pair's status as a J-1 nonimmigrant and as a nonresident alien."

I expect to enter 0 for both "Wages subject to Social Security Tax" and "Wages subject to Medicate Tax." However, when I do so, I get this error:

How do I proceed?