Envíe su Formulario de Declaración de Impuestos ... - USPS
Envíe su Formulario de Declaración de Impuestos con USPS. Use the U.S. Postal Service ® to mail your tax return, get proof that you mailed it, and track its arrival at the IRS.. Federal Tax Deadline The IRS considers a tax return filed on time if it is addressed correctly, has enough postage, and is postmarked by the due date.