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The law protects the interest of both parties but the costs involved in taking action against someone like this can sometimes outweigh the value of the job/account itself.

It's all about making clear your terms and conditions in the beginning. Putting together the agreement to costs and payment terms in writing which your client must sign will all work in your favour if or when problems arrise. A simple letter or two stating your actions for late payment based on your legally binding contract should, in most casses, resolve the late payment issues.

If they still will not pay, your next best course of action is to then fax them the completed form informing them that you are taking legal action against tham. As you have given them the opportunity to pay overdue invoice in writing along with your signed contact the law will be on your side.