It cost me over $3000 to be married on my 2024 taxes.
I used to be able to declare my house, and my parents' house (I own it). Because of these two things, I have been able to itemize my deductions. In 2024, because I got married, the itemized 'threshold' to reach was higher so I had to take the standard deduction, which ended up costing me a lot more in taxes. It's making me ask questions like "is it worth $3000 every year forever to stay married?"
Your mileage may vary!