A bank statement isn't a record
It's good for seeing that something came in, not for knowing which month it was for, whether it was paid in full, or whether half was left pending on a verbal agreement.
The rent almost always comes in. Almost. And that “almost” is what forces you to check the bank every month, to remember whether March was late, and to reconstruct the lot come tax time.
What happens without it
It's good for seeing that something came in, not for knowing which month it was for, whether it was paid in full, or whether half was left pending on a verbal agreement.
Applying a percentage by hand leaves cents of difference every month. Twelve months later the receipt figure and the bank figure don't match and nobody knows why.
“You're two months behind” is a different conversation if you can say exactly which months, how much, and since which day.
How it gets sorted
They come from the contract with their amount and their due date, and they can't be duplicated: the database prevents two receipts for the same month, which is the classic mistake of recording a payment twice.
If half is paid, half is recorded. The status isn't chosen by hand: it's worked out from what's been collected, so a “paid” receipt with zero on it can't exist.
Every outstanding receipt says since when. No mental arithmetic and no argument about which day it was due.
You put in this year's percentage and the new rent is worked out to the cent, once. Rounding receipt by receipt is what makes nothing add up at the end of the year.
The month, start to finish
Setting up a home takes under a minute, and you decide later whether you need anything more.