The FICA tax rate is a combination of the social security tax rate (6.2%) and the aforementioned Medicare tax rate (1.45%). Therefore, for 2016, the FICA tax rate will be 7.65%, to the height of the social security wage base. This means the maximum social security tax for employees and employers in 2016 is $7,347.
If he had more than this amount in Box 4 Social security tax withheld on his W-2, then his employer withheld too much.The employer would then need to refund the money to your husband and give you a corrected W-2. It will not change your tax return.
It is also possible that there was a typo when you entered the W-2.
