The problem with CC's is that it's just way too easy to spend more than you would if you had to use cash. For me, the only thing I use mine on is gas since I pay at the pump. We used to put groceries & such on the cards to take advantage of kick-backs from the card, but it's just not worth it when you find yourself with a bill that you struggle to pay.
I suggest sitting down with pen & paper (or a spreadsheet), add up your monthly income, and deduct your known monthly expenses (be sure to include things like real estate taxes, insurance, or other things that may not be billed every month). This should include gas & routine maintenance on the cars, mortgage, car payment, and any & all utility bills, but not groceries or entertainment expenses. Use worst case scenario on your utilties, not the low end or average. If you have a big balance on your CC and need to pay it down, include a monthly payment as well.
After you've deducted all the expenses from your income, see what you have left to spend in a month. Now, deduct the amount you wish to set aside for "rainy day", general savings, unexpected whoops, whatever.
What you're left with at the end, divide by 4.3. And every week, withdraw that amount from the bank.
Whatever you have in cash, that is yours to spend. If you are good & use lots of coupons this week or make good deals, or just decide you don't "need" as much as you thought, you may have extra for a new pair of shoes next week or a restaurant meal, or a night at the movies, whatever. If not, when the money runs out, you're done until next week. PERIOD.
For my family, it's not the fancy restaurants or clothes that trips us up with CC's. It's the "oh, this is on sale, and I have a coupon, so even if I don't need it, now's the time to buy" mentality that winds up running up the charges. But, because coupons & sales are pretty cyclical, there's really no reason to ever stock up. Ditto for all the other grocery/mundane stuff. Oh, pork tenderloin, let's have that for dinner one night (even if it's not on the list). When you buy with cash, you know you have to cut something ELSE out in order to avoid a very embarassing situation at the cash register.
With a CC, picking up something not on your list doesn't cause you to put something else back. Pretty soon, your $100 grocery bill is $175 and you don't even realize how much you overspent. I find it way, way too easy to run up several hundred bucks on the CC $5, $10, or $20 at a pop.
With a cash plan like this, you WANT to spend less & less, because you know
"if I can pocket $20 this week, next week, and the one after that, I have $60 all to myself to spend any way I want". And you can see the results right in your wallet.
Anyway, this seems to work for us. We've slipped into bad habits many times. It was always easy in the old days when the wife & I both had good jobs, the cars were paid off, and the kids weren't born. But, we have to be much more careful now, because it's so much more difficult at our current income level to catch up when we fall behind
