IRS has a Spanish version of the 2020 Form 1040 for the 1st time. The forms and Schedules 1, 2, and 3 are all in Spanish. All four forms can be downloaded from the IRS website.
If you wish to receive written communications from the IRS in a language other than English, download the IRS Schedule LEP and submit it.
The IRS communicates in 20 different languages.