NEW YORK (AP) — A “side hustle” can be one way to try out a new business idea before taking a full-fledged jump.

Nearly 1 in 3 Americans earn money on the side in addition to working full time, a Bankrate survey found.

But having a side hustle can be tricky to maintain. And if you’re not prepared, you might be on the hook for unpaid taxes and other headaches. Here are some tips to start working for yourself, even if it is just on the side.

First: be organized.

Even if you’re simply turning a hobby into a way to make a few dollars, creating a detailed step-by-step business plan can help prevent problems later. Keep detailed records of all expenses and communication. Downloading an an expense-tracking app may make bookkeeping easier.