Two people, married filing joint status: currently $25k standard deduction. Current FPL for two: $17.4k. I picked a couple with no kids because the higher refundable child tax credits just started and raise the bar for where federal income taxes start on a family of four (nb: they pay many other taxes: state, FICA, sales, property...)
There is a talking point from some on the right that 47% of US households pay no federal income tax that also makes me think this could be a net negative for many.