NEW YORK - American Express Co. will let cardholders in 17 states and Washington, D.C., earn airline miles by charging their federal and state income taxes to their Amex Delta Airlines cards this year.

American Express will give cardholders two miles for every dollar paid to the government. The new promotion applies to classic, gold, and platinum SkyMiles cards and is effective between Feb. 15 and April 16. People who use credit cards to pay income taxes must pay surcharges on their taxes, usually around 2.5% of the bill.

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