Many companies send out bills that are due on the 1st & 15th. Like a number of companies, mine PAYS on the 1st & 15th. Sometimes money going into my account wouldn't get in before the bills were due and I'd have a penalty or have to pay more interest.
I contacted ALL the people who bill me, including my mortgage company, & they have all agreed to make my bills due on the 5th & 20th. I had to climb a few "Customer Service" ladders, but now my bill paying doesn't cost me penalties or interest.