OP
Geordie Spark
To be honest matey you can have all the clauses in the world BUT some companies will pay when THEY want.
You need to factor in 30-60 days payment into your business.
On bigger jobs it makes perfect sense to stipulate payment after first fix and payment after 2nd fix/completion and certificates provided after payment received.
Tell me about it.
My customers included the Ministry of Defence, BT, an Opera Company, several bands, groups and musicians - some well known & others not so well known - most of the independent TV companies and a local independent radio station as well as the BBC, but I was often able to negotiate terms that were a bit closer to mine.
Those who reneged on the agreement had to find themselves a new supplier.
I agree completely with your comment: "On bigger jobs it makes perfect sense to stipulate payment after first fix and payment after 2nd fix/completion and certificates provided after payment received." My business at the time was nothing to do with sparking - it was manufacturing - but I employed the same tactics on big jobs. Money when the materials arrived and more as the job progressed followed my the final payment on completion and delivery.
Everything is negotiable and in 12 years the total amount I lost to bad debts was just under £1,500. Not too bad I reckon.