"due to be paid" is correct and usable in written English. You can use it when you are talking about an amount of money owed that is expected to be paid in the future. For example, "The customer owes us $200, due to be paid next month.".
The UK has frozen the remaining £11.1m due to be paid before the end of March.
They were due to be paid in cash in early 2009.
The EU can advance structural-fund aid that is due to be paid in future years.
That is when her husband, who is 64 and works at a chemical plant, is due to be paid.
And this specimen is due to be paid the equivalent as a single package for massaging a few numbers.
I'm panicking as my mortgage is due to be paid and my hubby's wage is in tomorrow [29 June ]
About $85,000 is due to be paid off in 2004; the remainder is due between 2021 and 2032.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia