If you did an amended return it should have reset to zero for a refund.
If you then added a dependent you probably should have gotten an additional refund.
Be sure you posted the person correctly, and they fit this criteria.
You can claim your son as a dependent provided he meets the rules below.
- Your son must be a U.S. citizen, a U.S. national, U.S. resident, or a resident of Canada or Mexico. There are certain exceptions for adopted children.
- You can't claim someone who is claimed as a dependent on another tax return.
- You can't claim someone who's married and files a joint tax return.
- They are related to you? The child can be your son, daughter, stepchild, eligible foster child, brother, sister, half-brother, half-sister, stepbrother, stepsister, adopted child or an offspring of any of them.
- Your child must be under age 19 or, if a full-time student, under age 24. There's no age limit if your child is permanently and totally disabled.
- The child must live with you for more than half the year. Living at school as a full time student does qualify.
- They may have a job, but they cannot provide more than half of their own support.
See the TurboTax article Rules for Claiming Dependents on Taxes