I bill NET 15 to protect myself, and it's served me well. A fair number of potential clients balk, preferring their usual NET 30 (or even longer), and if they d

I bill NET 15 to protect myself, and it's served me well. A fair number of potential clients balk, preferring their usual NET 30 (or even longer), and if they don't come around, I wish them well and walk away from the opportunity. If funds aren't in my account on the scheduled date (it's printed clearly on invoices), all work (even a tiny commit or Slack message) is suspended for the client. Thankfully this doesn't happen often, and when it does, the client almost always gets with the program thereafter. After two late payments (it's in my contract), I can terminate the engagement as-is, that's to say no wrap-up work of any kind. This all helps to keep me paid, and just as importantly, improves the quality of my clients.