View full size image. How long a healthy pregnancy lasts can vary by as much as five weeks, even when doctors precisely determined the date of conception, a new study suggests.
Exemptions for dependents. You can usually claim an exemption for each of your dependents. A dependent is either your child or a relative who meets a set of tests. You can't claim your spouse as a dependent. You must list the Social Security number of each dependent you claim on your tax return.
You can't claim an exemption for yourself if you're a dependent, so you're limited to the amount of the standard deduction. You must file a return and pay taxes on income that exceeds $6,200 in 2014 and $6,300 for the 2015 tax year. This rule only addresses earned income, however.