The National Vote at Home Institute conducted original research in the Fall of 2019 to see how many absentee voters from 2018 also voted that way in 2016, and therefore would have benefitted from a permanent absentee policy in their state, while in turn the elections officials in that state would not have had to process those applications a second time.
In the 40 states listed on page 2, citizens may or may not have to provide an excuse to sign up for a vote at home ballot, yet all are required to submit the same request, election after election, or year after year. And election officials have to process these requests again and again, often from the same voters. In the other 10 states, citizens can either choose to be on a “true” permanent absentee list, or they all get their ballots delivered automatically by state policy, saving voters time and hassle.