I don't know why you don't want to use the word overdue.
'Please note that the attached invoice was due for payment six days ago.'
It's still polite but adds a note of tetchiness (annoyance at having to wait for your money).

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Today is 16 January. If I politely remind a customer that payment is due on 10 January, is the following sentence natural? Please note that I don't want to use the wording of overdue.
Please note that the attached invoice is due for payment.
I don't know why you don't want to use the word overdue.
'Please note that the attached invoice was due for payment six days ago.'
It's still polite but adds a note of tetchiness (annoyance at having to wait for your money).
As it's the 16th now, use #2.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
If I use overdue in the said sentence, should I say "Please note the attached invoice is overdue"?
I am not a teacher.
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