The core difference comes down to control and taxes. A W-2 employee works under your direction. You set their hours, provide their tools, tell them how to do the work, and withhold taxes from every paycheck. A 1099 contractor operates independently. They control how and when they work, use their own equipment, and pay their own taxes.

For W-2 employees, you’re responsible for withholding federal income tax, Social Security, and Medicare from their wages. You also pay the employer portion of Social Security and Medicare, plus federal and state unemployment taxes. In Massachusetts, you’ll pay into the state unemployment fund and handle paid family medical leave contributions. All of this gets reported quarterly and summarized on a W-2 form at year end.

For 1099 contractors, you pay them the full agreed amount with no withholdings. They’re responsible for their own income taxes and self-employment taxes. Your only paperwork obligation is issuing a 1099-NEC at year end if you paid them $600 or more. No quarterly payroll reports, no employer taxes, no unemployment insurance.

The IRS looks at three factors when determining classification: behavioral control, financial control, and the type of relationship. Behavioral control means whether you direct how the work gets done, not just what result you want. Financial control includes whether they can work for others, set their own rates, and have their own business expenses. The relationship factor considers whether there’s a written contract, benefits provided, and whether the work is a key part of your business.

Misclassifying workers creates real problems. If you treat someone as a 1099 contractor when they should be a W-2 employee, you owe back taxes, penalties, and interest. The worker can also file for unemployment or workers’ comp benefits you never paid into. State agencies in Massachusetts actively audit for misclassification, and the penalties add up fast.

The decision isn’t about which costs less. It’s about the actual nature of the working relationship. A marketing consultant who serves multiple clients and sets their own schedule is likely a contractor. A marketing coordinator who works your hours, uses your computer, and reports to your manager is an employee, regardless of what you call them.

If you’re bringing on workers and aren’t sure how to classify them, get it right from the start. A small business bookkeeping service can help you understand the implications, and proper managed payroll keeps your W-2 employees compliant from day one.