US tax forms, line by line
Plain-language guides to the IRS forms people are asked for most, written from the IRS instructions. Each one says who needs the form, what to have ready, what goes on every line, the common mistakes and where the finished form goes.
- FormW-9 Gives your name and taxpayer ID number to a US client or payer who asks for it. Rev. March 2024 · Read the guide
- FormW-8BEN For individuals outside the US, when a US client or payer asks for it. Rev. October 2021 · Read the guide
- FormW-8BEN-E For companies and other entities outside the US, when a US client or payer asks for it. Rev. October 2021 · Read the guide
- FormW-7 Applies for an individual taxpayer identification number (ITIN) if you can't get a Social Security number. Rev. December 2024 · Read the guide
- FormSS-4 Applies for an employer identification number (EIN) for a business, trust or estate. Rev. December 2025 · Read the guide
These guides are our reading of the IRS instructions. They are not tax or legal advice, and no tax professional has reviewed them. Check irs.gov or ask a tax professional.
The app's forms list has 20 IRS forms in all; these five have guides.