While the federal income tax-filing deadline has passed for most people, there are some taxpayers who have not yet filed their tax returns. The Internal Revenue Service encourages them to file now, even if they can’t pay to avoid potential penalties and interest.There are many ways the IRS offers help to taxpayers facing this situation. The IRS offers these simple tips for handling some typical after-tax-day issues:For those who didn’t file by the April deadline There is no penalty for filing late if a refund is due. Penalties and interest only accrue on unfiled tax returns if taxes are not paid by April 15, the tax filing deadline this year in most states. Because of local holidays, the deadline for taxpayers living in Maine or Massachusetts was April 17, 2019.