My husband is supposed to pay me alimony every month. He didn't pay in July and promised me money at the end of this month. What can I do about it?

To some degree, it depends on exactly what the decree says he was supposed to do -- if there was an exact due date, he can be held to the date; if not, a date can be set, but it might be easier to just presume that a non-specific due date is the last day of the month.  If, as you say, the decree said payments are due on the first, interest is owed for each day late that the money was not paid.  Sometimes it helps "encourage" promptness to send a calculation showing how much interest accrues.  See http://willicklawgroup.com/interest-penalties/. As to not paying at all, the usual first step is a demand letter -- either from you or your counsel (either way, keep a copy -- it is an exhibit for any later court action).  If no response and money is forthcoming, file a motion to reduce arrears to judgment, with interest, and seek fees for doing so. If you have any questions on any of this, feel free to call.