Does anyone have any experience with contractors not submitting an invoice to the county for services performed? This has come up a few times - an engineering firm finally submitted an invoice for work performed 4-5 years ago and we have another contractor providing professional services who has not responded to multiple requests for invoices from us. This is probably not a very common issue since, why wouldn't a contractor want to get paid? But right now, we know that this one particular contractor has performed many, many hours last year but we have not received a single invoice. Grant it, there's a bit of a management issue on the county's part for letting things "slip" through the crack. I would think one option is: no invoice = no more work under agreement. Any other ideas?

I'm not sure what the problem is here. If contractors want to get paid, they'll submit their invoice, since the auditor won't sign off on a payment without one. Until then, the county has that money in its general fund, earning interest.