U.S. banks reported a combined $434 billion in net interest income for 2025, roughly $1,600 for every adult American.
Many checking accounts paid depositors just 0.01% interest.
The spread between what banks earn on loans (~6-7%) and pay on deposits (0.01%) is essentially a tax on financial illiteracy. That $434B represents the cost of convenience for people who haven't moved to high-yield savings, CDs, or money markets that actually compete for deposits.