Your problem is certainly not the first nor the last. Wife is
getting more and more difficult.
Even married men from my country complain why chinese women are
so kiam sap. Husbands have to chip in 100%.
I know a friend the wife earns more than him - yet he chip in
100% of the household expenses.
It is very rare nowadays to expect 50/50 or even 70/30. Wife is
now the queen of the household.
A lot of my friends tell me the only good thing in the marriage
is the children - the wife? throw in dust bin.
Symphathize with your situation. The only thing you can do is to
fight back and argue with your wife in the hope that she would back
down and accept your terms.
I did not set down any rules and conditions when I married my late
wife, but things seems to automatically fall into place, some with
a little bit assigning of responsibilities.
Most times when family is together, I pay. House bills, I pay.
Groceries, Kids stuff, and things she wants to get for the family
she pays. Generally, I pay for all the basic stuff, and she pays
for the "nice to have" stuff.
Not all women are like that. But I realised one thing. When
husband demands, normally there will be trouble. When the wife
demands, 80% (not verified) of the time, husband will give way.