If I just got a job, do I have to update my FAFSA?

I’ll be starting in March.

No.

The money that you earn from the job you start in March will be reported on the FAFSA you submit for the 2020-2021 school year (available to fill out in fall 2019).

yes, 2018 income won’t be reported until the 2020/21 FAFSA.