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I was given the explanation that because the payments now go to Boston, MA they must be postmarked by the 15th of the month that the quarterly payment is due. They used to give you a grace period and wouldn't charge interest if the payment was postmarked on or by the last day of the month in which it was due. I've lived in Warwick for 29 years and have never been charged interest on a payment. So, I figured the person I talked to knew what they were talking about. Needless to say I sent out the payments already. Now what? Hold my breath I guess.