Using credit cards to get airline mileage
I've wondered if it would be worthwhile to pay mortgage payments with a credit card to earn airline mileage. However, I just read an article that discussed using credit cards to pay your taxes and receive airline miles. The article noted that the IRS would not pay the credit card mechant fee (approximately 2.40 percent) and that the credit card holder would have to pay an equivalent "service" fee which might off-set all or most of the benefit in miles you received.
I would like to know if mortgage companies would also refuse the merchant fee. Thanks.