W-2 workers are employees. You withhold federal and state income taxes from their paychecks, pay employer portions of Social Security and Medicare (7.65% of wages), pay unemployment taxes, and provide workers’ compensation coverage. At year end, you give them a W-2 form showing wages and taxes withheld.

1099 workers are independent contractors. You pay them the full agreed amount with no withholding. They handle their own taxes, including the full 15.3% self-employment tax. You don’t pay employer payroll taxes on their earnings or provide workers’ comp coverage. If you pay a contractor $600 or more during the year, you send them a 1099-NEC form reporting the total.

The paperwork flows differently too. Employees fill out a W-4 when hired so you know how much to withhold. Contractors fill out a W-9 so you have their tax ID for 1099 reporting. With employees, you’re filing quarterly payroll tax returns and making regular tax deposits. With contractors, you’re just tracking payments and filing 1099s by January 31st.

Here’s where business owners get into trouble. You don’t get to decide whether someone is a W-2 or 1099 worker based on what’s easier or cheaper. The IRS and state agencies determine classification based on the actual working relationship. The main factor is control. If you control when, where, and how someone does their work, they’re likely an employee regardless of what you call them on paper.

Massachusetts is particularly aggressive about worker classification. The state uses an ABC test that presumes workers are employees unless you can prove all three conditions: the worker is free from your control, performs work outside your usual business, and has an independent trade or business doing that type of work. Construction businesses face extra scrutiny because the industry has a history of misclassification.

Getting this wrong is expensive. Back payroll taxes with penalties and interest. Unpaid unemployment insurance. Workers’ comp claims for uninsured workers. The state can audit you going back years. Beyond the financial penalties, intentional misclassification can result in criminal charges in Massachusetts.

The practical test is straightforward. Does this person work regular hours you set? Use your tools and equipment? Work exclusively or primarily for you? Follow your processes? If yes, they’re probably an employee even if you’ve been paying them as a contractor.

There are legitimate reasons to use contractors. Hiring a specialist for a specific project, bringing in expertise you don’t have in-house, or using licensed subs on construction jobs. The key is that contractors genuinely operate independent businesses with multiple clients, their own tools, and control over how they complete the work.

If you’re unsure about classification for workers you already have, get it reviewed before an audit forces the issue. Small business bookkeeping in MetroWest Massachusetts that includes proper worker classification and 1099 tracking saves you from costly surprises when the state comes asking questions.