I cant imagine her student loan payments will dramatically increase.
You will save money on income tax.
Even if you have to pay $100-$200 more on student loans, you will be better off married since you have to pay the loans anyway and they will be accumulating compound interest on the balances.
Again, I doubt they will dramatically increase based on your current income level assuming she does not make dramatically less than you.
You can find SL calculators online to get a guestimate.
Happy wife, happy life.
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My boss and his wife file separately because of student loan repayments - but he makes a whole lot more than your combined incomes (and his wife's is far less), so it's a pretty significant impact for them - they've worked out the math (I think it's nuts for the reasons Shooting-for-800 says - neither are on PSLF/Repaye, so they'll just end up paying more in the long run).
You can speak with a tax/financial advisor to see how the math works out, or you can do the math yourself - there are repayment calculators on the Dept of Ed website that can calculate the differences for you, and also use the IRS tax calculator for 2019 to figure it out.