W-2: This is the form you receive from a regular employer. This form includes information about your wages and other earnings (including tips, if applicable). This form also includes information about how much you have paid in federal and state taxes over the course of the year, as well as your payroll taxes.
1099-K: If you earned income as a freelancer working in the on-demand economy like Uber or Lyft you may see this form. Form 1099-K reports income processed through third-party networks, such as PayPal. A payment processor must report income to the IRS using Form 1099-K if your gross payments:
Exceed $20,000, AND
Exceed 200 transactions within the tax year
1099-MISC: More and more people do contract work on the side, as freelancers and consultants. If you have received earnings from such activities you can expect to receive a 1099-MISC.
Other 1099 forms: The 1099-MISC isn’t the only 1099 form you might receive. If you received interest from savings or investments, you will get a 1099-INT. You might also receive 1099-DIV reporting dividends and distributions from investments, or a 1099-C if you have canceled debt.
1098: This is the form associated with mortgage interest you have paid during the year. If you itemize your deductions, this form can be extremely helpful in ensuring that you get the right amount listed.