Here's one area where you're potentially penalized for marrying and filing jointly: the itemized deduction for state and local taxes (SALT) is limited to $10,000 for both single taxpayers and for those filing married jointly. So if you have real estate & local income taxes exceeding $10,000, the advantage clearly goes to remaining single as opposed to marrying and filing jointly - since by filing as single you can each deduct up to $10,000 of SALT.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
