Married couples have the option to file jointly or separately on their federal income tax returns. Undoubtedly, married couples during tax season have asked each other if they are filing advantageously, whether currently filing jointly or separately. The IRS strongly encourages most couples to file joint tax returns by extending several tax breaks to those who file together. In the vast majority of cases, it’s best for married couples to file jointly, but there may be a few instances when it’s better to submit separate returns.