WASHINGTON (DC News Now) -- Taxpayers must file federal taxes by April 15 to avoid paying late fees and interest---unless they file an extension. Filing an extension allows for six additional months to gather and submit documents, though any money owed must still be paid by April 15. Extensions c an be filed using a Form 4868. Check your tickets! $870K lottery ticket purchased in Hagerstown unclaimed Forms sent via mail must be postmarked by April 15 to be considered on time. If filing an extension, experts recommend making the best guess for what is owed to avoid underpaying. According to the IRS, most refunds are issued within 21 days of filing. The fastest way to receive a refund is by e-filing and requesting a direct deposit. Taxpayers whose adjusted gross income was under $84,000 may use IRS Free File to take advantage of software from one of eight partner companies. ...read more read less