Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

How to share income after marriage and kids?
I think the problem is that you've made a math error. This child would not be costing you 300 per month, it will be costing you 1400 per month.  1100 of this is in a donation of salable hours rather than cash, but helpfully you have a number right there as to how much someone is willing to pay for these hours so the math is still doable. So, if you are indeed splitting your expenses fifty-fifty, you should chip 1100 into the pot to match your wife's contribution.  It would make the most sense, I think, to have your part of this contribution cover some of your mutual expenses, and if any is left over, save it up for the day that your child would cost more than that 300 in a month - when you need extra clothes, or have to replace something they destroyed, or want to pay for extra opportunities (camps, educational games, lessons), or a a savings that can be used for major future expenses (higher education, first car, milestone celebrations, safety net when starting out). Of course, if your family is indeed a priority, you might consider making an equal investment in your family - say, half your income (1800) to match half her time going into the building of the family.  After all, the decision to start a family should be an investment of time and value, not just a minimum bid for expenses.  And again, any extra can be spent on mutual expenses, saved up for future costs, or left as your child's "savings" for major expenses or safety net. I suppose I should mention that you perhaps could get away with covering half her contribution (550 per month, on the face of it), as that should also "balance" out the monthly expenses.  Even this much would be enough to put her back into the green on her covering her own costs.  Of course, in this case you might want to take into account that while she's working 38,5 hours per week now, running a household is, I've heard, more closely equivalent to a 60-hour week, plus or minus being "on call" for a further 100 hours a week.  Trying to calculate the absolute minimum payment on your part to match the investment of hours on hers is likely to be a bit more tricky than just matching the salable hours not worked, if you're set on income ratios and splitting costs "as they are". Also, you might want to rethink your criteria for sharing income completely or what makes certain divisions of costs "unfair". You mention one reason it would be unfair is that you have a "more stressful job" - well, your job may well be more stressful than her job now, but it is likely to be less so than raising a child (her new job).  As for investment of time and energy for your education entitling you to a larger amount of pay, again, raising a child is likely to be a larger investment of time, money, and anxiety than your education, but her pay (or even share of the costs) doesn't seem to be balanced in response.  I'm not gonna tell you what is fair, that's for you to work out, just suggesting you really think it through before deciding what would be fair or not.