Read that notice again carefully ... they are not listing FAX numbers when they will accept information online. The new online system to respond to IRS notices (and attach any required docs) is easy to use.
https://www.irs.gov/individuals/understanding-your-irs-notice-or-letter#:~:text=You%20should%20reply....
Respond
If your notice or letter requires a response by a specific date, there are two main reasons you’ll want to comply:
- to minimize additional interest and penalty charges.
- to preserve your appeal rights if you don’t agree.
You should reply as indicated on your letter or notice that could include mail, FAX, or digitally through the IRS’ Documentation Upload Tool, when available, by using the unique access code provided in your letter or notice.
