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What if I do not notify CBP of banking changes? What happens to my refund?

What if I do not notify CBP of banking changes? What happens to my refund?

We will make an attempt to contact you when we are notified by our bank that your electronic payment was not received successfully. Please note this may cause a delay of any future refund payments if we cannot reach you timely. If we cannot reach you, your refund payments will revert back to paper checks that will be mailed through the U.S. Postal Service.