Know what every regular owes before they finish asking
On your phone at the register, put it on their tab and see, to the cent, who owes you.
Start your tab book$6.75
When they say they paid
Show them every charge and payment, newest first. A mistake comes off and stays in the history, crossed through.
Doña Carmen$6.75
- Paid Oct 16−$10.00
- Put on tab Oct 16$4.25
- milk and bread Oct 7$12.50
Longest owed, on top
Whoever has owed you for five weeks is first on the list, not lost on a page nobody turns to.
Only between you and them
No texts to your regulars, no card readers, no interest or fees. Family or a clerk writes in the same book.