You can click on the link for the Interactive Tax Assistant (ITA) if you're unsure about which is the most appropriate form for you. There's also an explanatory publication, "Which form should I ...

Robert W. Wood is a tax lawyer focusing on taxes and litigation. Closeup of Form 1099-K, Payment Card and Third Party Network Transactions, an IRS information return ... [+] used to report certain ...

including IRS Forms 3520, 3520-A, 5471, and 5472. Under these systemic assessment procedures, the IRS automatically imposes penalties against taxpayers who file one or more of these returns late.

If you agree, sign the response form and send it in with any money you owe. If you don’t agree, complete the form and provide a signed statement explaining why, and send documents supporting your ...