The sites let you complete and print out just about any kind of planning document you can think of—wills, trusts, healthcare directives, and/or power of attorney—in just a matter of minutes. And the documents are typically quite inexpensive, with many sites offering simple wills for $50 or less.

At first glance, such DIY planning documents might appear to be a quick and inexpensive way to finally cross estate planning off your life’s lengthy to-do list. You know planning for your death and potential incapacity is important, but you just never seem to have time to take care of it.

And even if you realize your DIY plan won’t be as good as those prepared by a lawyer, at least it can serve as a temporary solution, until you can find time to meet with an attorney to upgrade. These forms may not be perfect, you reason, but at least they’re better than having no plan at all.

However, relying on DIY planning documents can actually be worse than having no plan at all—and here’s why: