So I take a 25% deposit of the package price. This is to hold the date for you, covers any admin time and your engagement shoot if it's included. The balance is then due the month before your wedding, or 30 days. That way you can save towards the balance to be paid, or you can pay it off over the year if you'd prefer. I'm quite flexible.
As long as the full amount is paid before the day, or at least 14 days before, then I'm happy to make arrangements that suit us both best.