# Fax numbers guides

A dedicated fax number gives people a way to send documents back to you. Start with choosing a number, setting up receiving, and deciding whether to transfer a number you already use.

## [How to receive an IRS 147C letter by fax](https://dearfax.com/guides/how-to-receive-irs-147c-letter.md)

Request written confirmation of an existing EIN and prepare a receiving number before you call the IRS.

## [How to fax Form SS-4 for an EIN](https://dearfax.com/guides/how-to-fax-ss4-for-ein.md)

Choose the correct IRS route, prepare a signed SS-4, and include a working return fax number for your EIN application.

## [How to get a fax number](https://dearfax.com/guides/how-to-get-a-fax-number.md)

Choose an online fax number for receiving documents, sending replies, and sharing access with your team. No phone line or fax machine needed.