A woman earning more than her husband or partner can change far more than the number on a paycheck. It can challenge assumptions about who pays for dinner, who makes major financial decisions, who carries the household, and what each person contributes.
The arrangement itself does not create a problem. The trouble often starts when income becomes tangled with identity. One partner may quietly feel embarrassed about earning less, while the other may feel pressure to justify earning more. Then an ordinary conversation about a mortgage payment can somehow become an argument about respect.