With the 2020 Open Enrollment Period rapidly approaching (it actually kicks off on October 15th in California, and on November 1st in every other state + DC), it's important to keep in mind that many people who didn't qualify for financial assistance in 2019 may qualify in 2020...and in some cases that could mean a difference of thousands of dollars due to how the ACA subsidy formula works and other factors.
First, a refresher on how the ACA formula works for Individual Market enrollees (that is, people who are looking to buy health insurance for themselves and/or their family who don't receive it through their employer, Medicare, Medicaid, CHIP or some other source).