Calculate how much of a income you have including everywhere you get it from, like secondary jobs, spouse jobs and other such reliable incomes or fallouts.
take all your bills in the last six months or if you have them the last 1 year. See how much you are spending in basic stuff like: your home, food, transportation (car, gas, bus), property insurance (car and/or house), health expenditures,telephone, internet and other such basics.
see how much you have to pay off in the way of loans, such as mortgage, student loans, credit cards.
Calculate all these things together and see how much money you spend on neccessities such as these and see how much is left in your income.
Try to track your disposable income spending in things that you have control over. For example, tv, cellphone, entertainment, clothing, and other extra things where you can cut the fat and really trim the expenses.
It will aid to have six months to two years worth of bills to track where you spend your money.
This will give you a gist of how much money you are truly spending, and see how much you can afford to cut back. Certain professions need you to be on call, so you might be needing your cellphone.
I believe that the first things you should really take care of are your loans, because high interest loans can really cut into your long term income. Getting rid of this is the easiest and pain free way to enjoy shopping in the long run.
Consult your family about where they can cut back if the situation is starting to get bleak.
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So after all this work, how much money do you have left over? Try to save half of that and maybe put the rest into a shopping fund.
I also find making a list of stuff that my wardrobe and I need, its easy to have a great wardrobe that expreses my asthetic and sense of style while not stifling me.
I also like to window shop all over the net, and see what really piques my interest. I find that there are certain things that really draws me towards them and I write that thing down, on shopping trips I am always on the hunt for those things. I keep the lists in every single purse, so no matter which one I choose I know that I have the list I need and I don't find myself pondering over the 'Mackage' military blazer in canvas forest green when I know that I love and want a leather blazer in deep royal purple to off set my gorgeous sweater in maroon!
Most woman I find are teetering between 150 - 250 dollars a month for a shopping budget.