My wife and I believe in shared responsibility in our finances as well as home and child raising. Since Day 1 when we got married, we shared our household expenses 50% each. Over time, even though my annual income surpassed hers a lot, we still maintain the 50% sharing. Now, I am managing my own investment fund full time from home, earning $100k pa in trading profits and dividends. She earns $120k pa from salary. Our expenses now is $110k pa, so we share the expenses $55k each. She saves $65k pa while I save $45k pa, which I reinvest.