We recently reviewed your account and noticed you are (number) days overdue. As a result, we have assessed a late fee of $(amount). Your current amount due is $(amount).
Please remit payment immediately to avoid any collections fees. If you have already sent your...
Dear (recipient's name),
We recently reviewed your account and noticed you are (number) days overdue. As a result, we have assessed a late fee of $(amount). Your current amount due is $(amount).
Please remit payment immediately to avoid any collections fees. If you have already sent your payment, please disregard this notice.
Sincerely,
(your name)