Hi NYG, why not keep it much more open - something along the lines of:

Hi W, I've attached last month's statement for you. If you can let me have your contribution by X date, I'd be grateful.

Best regards, NYG

T 13 M 7
Me 48 H 46
SS 15
BD 7.14 PA
D final 5.16 (H filed)

We receive & we lose, and must try to achieve gratitude & embrace with whole hearts whatever of life that remains after the losses - Dubus