Generally speaking, if you close at the beginning of the month you will bring more money to closing. The lender will require you to pay (at closing) the interest on the loan from the day you close until the last day of the month you close. For example, if you close on September 15th - as part of your closing costs you will need to pay interest from September 15th through September 30th. That's why most buyers prefer to close closer to the end of the month. It minimizes the amount of money they have to bring to the closing table.