quarter-day (first day of a quarter,when payments become due )
(d) Contributions shall become due on the first of January of each year.
"the draft for $1,000 which, as I advised you on the 1st March had not been accepted, having since become due and not being discharged, I have now to return it to you with a protest for non-payment, together with an account of my commission and charges"
a charge in favor of the Contractor's bankers of any money due or to become due under the Contract
