Start with a federal Employer Identification Number if you don’t have one. Apply through the IRS website and you’ll receive it immediately. You need this before registering with Massachusetts agencies.

Register with the Massachusetts Department of Revenue for withholding tax. You’ll file Form TA-1 to get your withholding account number. Massachusetts has a flat 5% income tax rate, which simplifies calculations compared to states with multiple brackets. You’ll withhold based on employee W-4 forms and remit on a schedule determined by your total withholding amount.

Register with the Department of Unemployment Assistance for unemployment insurance. Massachusetts requires employers to pay into the unemployment fund. Your rate depends on your industry and experience rating. New employers typically start at a standard rate until they build their own claims history.

Paid Family and Medical Leave is where Massachusetts differs from most states. The PFML program requires contributions from both employers and employees, though employers with fewer than 25 employees only need to remit the employee portion. Employees contribute 0.318% for family leave and employers contribute 0.336% for medical leave on wages up to the Social Security cap. You withhold employee contributions from paychecks and report and remit everything quarterly to the Department of Family and Medical Leave. Missing this requirement creates problems because the state actively enforces it.

Workers’ compensation insurance is mandatory for all Massachusetts employers. You need coverage before your first employee starts work. Purchase through a licensed insurer or through the Massachusetts Workers’ Compensation Assigned Risk Pool if you can’t get coverage in the standard market.

Pay frequency matters in Massachusetts. Most employees must be paid weekly or biweekly. Salaried employees and certain other categories can be paid less frequently, but hourly employees generally require weekly pay. Getting this wrong means wage and hour violations.

Deposit schedules vary by how much you withhold. Smaller employers typically deposit monthly. Larger employers with significant withholding may need to deposit more frequently. Federal payroll taxes follow their own schedule based on your total liability. Missing deposit deadlines triggers penalties immediately.

Quarterly filings include Form 941 to the IRS for federal payroll taxes, Massachusetts Form M-941 for state withholding, unemployment wage reports to DUA, and PFML reports to DFML. Annual requirements include W-2s to employees and the Social Security Administration, plus reconciliation forms for state withholding.

The setup isn’t impossible but the ongoing compliance has multiple moving parts. Between federal requirements, state withholding, unemployment insurance, PFML contributions, and workers’ comp, there are several agencies expecting filings and payments on specific schedules. Miss one and penalties start accumulating.

Most small businesses in the Merrimack Valley and Greater Boston area either use payroll software that handles the calculations and filings automatically or outsource to managed payroll services entirely. The cost of professional payroll processing is usually less than the penalties for getting it wrong, and far less than the time you’d spend becoming an expert in multi-agency compliance. An Andover, MA bookkeeper familiar with Massachusetts requirements can help you set up correctly from the start and keep everything compliant as regulations change.