H & R Block knows taxes! Our offices are conveniently located in Leesburg, Ashburn, Sterling, Herndon and Reston. No matter what your tax preparation needs are, our tax pros at H & R Block can help! When you file in one of our H & R Block tax offices, you have a trusted partner. We are dedicated to getting you your absolute maximum refund guaranteed! We know what your refund means to you, so call us today and make an appointment.