Earning extra income feels great until tax season arrives. A second job, freelance project, or growing side hustle can change how you’re taxed in ways many people don’t expect. Here are three rules to understand that will help you avoid the tax pitfalls of adding extra income.

Know whether you’re an employee or an independent contractor

Many contractors and freelancers assume they’re taxed the same way as at their day job. Then tax season arrives, and they discover no one was setting aside money for Social Security, Medicare, or income taxes. In some cases, it is surprising to learn they were in a different classification than expected.

Before accepting additional income, ask about the method of payment and whether you’ll receive a Form W-2 or Form 1099. A short conversation upfront can prevent a much longer conversation when you prepare your tax return.

Employee income isn’t always simple

Your employer withholds Social Security and Medicare taxes from your paychecks, which makes payroll taxes feel largely automatic. The problem starts when you add a second job or other side income. Each employer calculates withholding as if it’s your only source of income, which can leave you short when the sum of everything together is on your tax return. Some workers may also receive tax forms other than a traditional W-2, creating another opportunity for confusion.

You must review your withholdings whenever you add a new income stream. A quick check during the year is much easier than finding out in April that your paycheck withholding wasn’t keeping pace with your total earnings.

Contracting income means more responsibility

Receiving a 1099 often feels very different from receiving a paycheck because there are no tax withholdings occurring along the way. You’re responsible for both sides of Social Security and Medicare taxes, which can make the final tax bill larger than expected. Mixing business and personal spending can also make it harder to identify expenses that could reduce taxable income.

Keep business income and expenses separate from personal spending, whether that means opening a dedicated account or tightening up the one already in place. And if additional income becomes regular, build estimated tax payments into the routine instead of treating them as a year-end problem. A quick estimate during the year can help decide whether quarterly payments make sense.

Avoiding issues that come with adding extra income

Extra income can create new opportunities, but it also introduces new tax responsibilities. A little planning now can help keep more of what you earn and prevent unpleasant tax surprises later. Contact our RRBB advisors if you have questions about your extra income.