The earnings limit for those like you who have not yet reached the full retirement age is $1,310 per month, or $20 more per month than in 2014. If you exceed this limit, you’ll lose $1 of benefits for each $2 of benefits over the limit.
Generally, an unmarried person who maintains a household for dependents and is allowed to compute his or her tax based on head of household rates, which are more favorable than single person rates.