Single Member with Multiple LLC's can you use one check book

We file as sole Prop. on our taxes. We have multiple LLC's and use only one checkbook. Do we need to set up other checkbooks for each LLC?

Answer

Each limited liability company should have its own bank account--otherwise, you are clearly commingling funds and you'll lose all liability insulation between the LLCs. In other words, if you're not going to have separate bank accounts for each LLC, then you might as well just run all those businesses in the same entity.

If each LLC has its own bank account, but you keep track of expenses and revenue using a single checkbook, then that shouldn't be a problem.