Longtime reader Samuel Ng sent in this inspirational success story about asking for 100% up-front (shared with permission):
I took your advice and asked for 100% up front. I was ready to get a pushback and was prepared to get 50% up front and 50% after 30 days. I learnt the 30 days thing from you too.
There was no pushback. No proposals, no sales scripts, only one meeting, they paid the invoice in full within 1 day!
I know it seems impossible, but asking for 100% up-front works.
(Just imagine never chasing a final payment again...)