If you are receiving SSDI (Title II disability benefits) your monthly check will not be impacted if you get married. This is because your SSDI payment is based on your earnings record and household income is not a factor in determining your eligibility.
By contrast, your SSI payment most likely would be impacted by your marriage, especially if your spouse-to-be is working. SSI (Title XVI disability) is a welfare program and your benefit payment is subject to something called the “deeming rules.”
The deeming rules are quite complex but the net result of these rules would be to cause you to lose some or all of your SSI monthly check if your spouse earns even a modest salary. Further, if you get married and certain assets end up in your name, those assets can also serve to reduce your SSI benefit payment.
If your spouse-to-be is also collecting SSI, you will both likely see a reduction in your total monthly benefit. This is because the maximum you can receive for SSI (in 2013) is $710, but the max for a married couple is $1,066.
So, the bottom line here: if you are receiving SSDI, your check will not be impacted by a marriage, but if you are receiving SSI, your check will most likely be negatively impacted.