Liz Weston

Dear Liz: I am a full-time employee who just started independent consulting work on the side. I have submitted my W-9 with the company with which I am a consultant, but I know the onus will be on me to set aside federal tax payments. Here’s my question: Will I pay state taxes on my consulting income? And if so, will those taxes be paid in the state where I live or the state where the company is based?

Answer: If you live in a state that taxes income, and you have income to tax, then yes, you’ll probably have to pay state income taxes on your net income — your gross revenue minus your expenses.

“Since you are in business for yourself, contracting with another company, you will pay taxes in the state where you do the work,” said enrolled agent Eva Rosenberg of the TaxMama.com site. “If you perform the services in your own state, that’s where your taxable responsibilities lie. However, if you frequently go to the client’s location and do work there, you will be liable for taxes in that state as well.”

A good rule of thumb is to set aside half of any money you make to cover the various taxes you’ll owe, Rosenberg said.

“Payroll taxes are 15.3%. If you’re making enough to live on, you’re in the 25% bracket at least. That’s 40%,” she said. “Depending on the state, that could be another 5% to 10%.”

You probably should make quarterly estimated tax payments to avoid a penalty. Business owners, especially newly minted ones, would be smart to hire a tax pro to help them navigate their obligations.