Not always $375k. Perhaps TurboTax should fix this?
https://www.irs.gov/publications/p936
"Mortgages you (or your spouse if married filing a joint return) took out after October 13, 1987, and prior to December 16, 2017 (see binding contract exception below), to buy, build, or substantially improve your home (called home acquisition debt), but only if throughout 2020 these mortgages plus any grandfathered debt totaled $1 million or less ($500,000 or less if married filing separately)."
