Great job! If your expenses are $2000, and your rental income is $1500, then take your new $50,000 income, subtract taxes, subtract another $6,000 to cover your gap in expenses, and you have probably almost $30,000 left. That's what I assume you'd be putting away for the kids' college fund. The question is, how long does your wife want to work, and then secondly, do you plan to have an income of $10,000 forever? Lastly, if your kids can go to their state school, can you have that cash saved up rather quickly? Many things to consider along those lines. It seems that once your kids colleges are taken care of, buying one last rental with at least $500 in cash flow per month should take care of you into retirement, since you only have a $6,000 gap on your own expenses. Then you're free. At least that's my back of the napkin calculation.