<prompt> Human: Last year my wife and I had a combined income of 142,000. This led us to owing 3,360. I was confused as how we could owe so much when I realized that we both had claimed 1 on our W4s. We paid that bill and switched our W4 to 0. This year our combined income is roughly 160,000 and even with switching our W4 over, we owe almost 6,000. What are we doing wrong?I have my standard deductions like mortgage interest, student loan interest and some additional educational deductions since Im going back to school for my Masters. It seems though that a lot of deductionscredits are not available because of our income amount.Is there something else we should be doing to not have to owe so much in April?Assistant: If each of you makes a large and roughly equal salary, it can be beneficial to withhold as married but higher single rate.For whatever reasons, if you withhold as married there is an assumption somewhere in the system that one of you is a breadwinner and the other makes less. So less will be withheld vs. when you were both single. But, if you both make roughly equal, married may not withhold enough and you will get a tax bill in April. This is because for some couples, the combined income pushes them into a higher tax bracket vs. where they each were as singles.Human: I make 100 and she makes 50. The additional income is from a rental property that we have.  <response>: Then you should have been making quarterly withholding on the rental income. 