Here's the system we use, which can work pretty well. Figure out what your routine living expenses are (food, housing, transportation, utility bills, etc.). Then have each person contribute to those expenses in proportion to their income. So if expenses are $1000, and A makes 4 times as much money as B, A would put in $800 and B would put in $200. Then each person keeps what is left of their income to do with whatever they choose.
It's obviously unrealistic to expect someone with a very small income to pay half of everything, but having that person not contribute at all isn't good either. This way, each person is putting in the same fraction of their income and making a reasonable contribution to your shared expenses. If both parties are OK with this and clear on what's expected, then it becomes easier to "let go" of what the other person does with their own extra money.
Money issues are a major source of friction between couples. It seems one person is always the "careful" one who worries about it, and the other person is the "reckless" one who doesn't. Ideally, the careful one can learn to lighten up a bit, and the reckless one can learn to see the long-term advantages of being a bit more cautious. Often, unfortunately, the difference can just polarize people and make each them even less reasonable than before.
The more you can spell out explicitly and agree upon, the better. What makes these situations nasty is when the two people just have very different expectations and become frustrated by the other one's behavior. My advice: communicate when you're not upset about it, agree to some very specific things about how you will handle money as a couple, and then, once you have that agreement, let go of any issues you have with how the other person deals with money outside the conditions of your agreement.
Establish a clear common ground that you can both count on, but then respect that you are still different people with different priorities.
It's obviously unrealistic to expect someone with a very small income to pay half of everything, but having that person not contribute at all isn't good either. This way, each person is putting in the same fraction of their income and making a reasonable contribution to your shared expenses. If both parties are OK with this and clear on what's expected, then it becomes easier to "let go" of what the other person does with their own extra money.
Money issues are a major source of friction between couples. It seems one person is always the "careful" one who worries about it, and the other person is the "reckless" one who doesn't. Ideally, the careful one can learn to lighten up a bit, and the reckless one can learn to see the long-term advantages of being a bit more cautious. Often, unfortunately, the difference can just polarize people and make each them even less reasonable than before.
The more you can spell out explicitly and agree upon, the better. What makes these situations nasty is when the two people just have very different expectations and become frustrated by the other one's behavior. My advice: communicate when you're not upset about it, agree to some very specific things about how you will handle money as a couple, and then, once you have that agreement, let go of any issues you have with how the other person deals with money outside the conditions of your agreement.
Establish a clear common ground that you can both count on, but then respect that you are still different people with different priorities.