After I withhold, when do I actually have to deposit the tax, and when are Form 1042 and 1042-S due?
Say my LLC withholds tax on a payment to a foreign payee. What is the timeline after that? Do I send the money to the IRS immediately, monthly, or just once a year with the return? And when are Form 1042 and the 1042-S forms themselves due? I'd also like to know whether I'm forced to e-file and what the IRIS thing I keep hearing about is.
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