Not much money at all. (exempt Howard's pre-nup that gives Beth 2 million per year).
All clothes are tax deductible. (Remember that Beth is employed at one of Howard's companies). Beth also get cloathes allowance from the crappy TV shows she does. The jewellery is tax deductible. (just write computer parts on the recipe). All the dinners are representation. (yes.. tax deductible).
If Howard gives Beth anything is clothes/bags from the last year collection that is sold at a deep discount + sponsors like Steven Singer.
First rule of Howard: All money is MINE