Yes, you may collect both Title II Social Security Disability Benefits and Title XVI Supplemental Security Income Benefits if the maximum Title II Social Security Disability monthly benefit is less than the maximum Title XVI Supplemental Security Income monthly benefit.  Your Title II Social Security Disability monthly benefit will be calculated first and then you will be paid  a partial Title XVI Supplemental Security Income monthly benefit amount to make your total monthly benefit amount add up to the maximum Supplemental Security Income monthly benefit allowed for you.  The maximum Supplemental Security Income monthly benefit paid to an individual in 2010 is $674.00.  Therefore, if your Title II Social Security Disability monthly benefit exceeds this amount, then you will not receive both in any month which you received the Title II benefit.