We are a GC licensed to do work in Washington State, Oregon,Idaho, Texas, Arizona & California. This situation applies mostly to our Washington State & Oregon jobs and subcontractors we have had perform work on jobs in those states. As of the last week or 2 we have received a considerable amount of invoices from Subcontractors for work performed as far back as July of last year through December 2019. We have closed our 2019 financials and will have to go back and amend our tax reporting, re-open closed projects to cost these expenses; not to mention the time spent researching closed projects, budgets, making sure the Sub was authorized to be working during the time frame invoiced, etc... I want to know what rights we have legally to enforce a percentage or Flat Rate Fee for invoices submitted over 90 days and that cross over financial years and require further overhead cost on our part.