Open ended payment date

I sometimes work for an organisation providing education courses. They have always been terrible payers and I have had to chase them several times. Last time I had to threaten legal action when, for work I had completed in April, I had not been paid in July. Their terms stated the usual 'paid at the end of the month following the month when the invoice is received'. Now - I guess in response to my complaint, they have changed their terms to: 'Your claim will become due after approved receipt of the completed claim form. This is normally a minimum of 60 days.'

That sound pretty open-ended and they could refuse to pay for 90 days, or 360 days and would still be within these terms.

Can they say this? Is there actually a statutory expectation for when invoices become due?

Thanks,

John

Thanks David,

Yes, I told them they were grossly unfair conditions. I have written and told them that I interpret their terms as 60 days from submission of my invoice and that, if they wanted to give me an exact measure of days they could do but that silence would be considered assent. They need me more than I need them!

Have become a supporter.