Which billing dates do you choose for your hosting business?

Currently we bill on the day of the month that they signed up. We get a steady flow of payments come in each day of the month.

I am tempted to suggest switching to billing on the 1st of the month.

What are your thoughts on that kind of billing? I think it will be easier to manage late payments etc... and keep everything in 1 cycle each month instead of it being each day.

However, I also wonder if it will be a huge workload on 1 day of the month instead of a smaller amount each day.

Any thoughts?