NEC ECC: Assessing the amount due

In relation to NEC3 Contract type F.

If the Contract has not submitted the monthly amount for payment.
Can Project Manager assess the amount due ?

Yes under NEC3 the Project Manager is obliged to make their own assessment of the amount due even if the Contractor has not submitted an assessment. Probably quite hard to do as how much the Contractor has spent on a cost reimbursable type contract will not necessarily be obvious - so it will more likely be a lower assessment than a high one.

My advise would be for a Contractor to make sure they put their application in!

This would be a more interesting question under NEC4 as the rules change - and no application from the Contractor means the PM will assess them self at zero (or a negative value if they feel last month was overpaid).