Massachusetts Employer Payroll Compliance — M-941, PFML, SUI & Wage Act

Confirm the employer is registered with the Massachusetts DOR for withholding, DUA for SUI, and DFML for PFML. Collect the employer's EIN, MA withholding account number, UI account number, and DFML account credentials. Determine the employer's DOR-assigned filing frequency (annual/quarterly/monthly/quarter-monthly) based on prior-year MA withholding liability, and flag whether the Frances Perkins salary-range disclosure requirements (effective October 29, 2025, for 25+ employees) apply.

Collect or verify Form M-4 (Massachusetts Employee's Withholding Exemption Certificate) for every employee. Apply Circular M withholding tables at 5% flat (Part B wages) to compute per-paycheck MA withholding. Flag any employee whose annualized wages are expected to exceed the $1,083,150 surtax threshold (TIR 24-13) and discuss optional additional withholding at 4% for the excess slice. Set supplemental wage withholding at the flat 5% rate for bonuses and commissions paid separately.

Compute per-employee PFML contributions at the 2025 combined rate of 0.88% (medical 0.70% / family 0.18%) on wages up to the $176,100 Social Security wage base. Apply the employer/employee split: employee maximum 0.46%, employer minimum 0.42% on medical leave only if 25+ covered individuals. Set SUI rate per the DUA Schedule E experience-rate notice (new employer non-construction: 1.45%; construction: 6.72%) plus the COVID-19 Recovery Assessment on the $15,000 per-employee wage base. Compute EMAC at 0.34% on the first $15,000 per employee (if 6+ employees and beyond the 3-year new-employer window).

For each calendar quarter, file Form M-941 (or M-941W for weekly depositors) with the DOR by the applicable due date (April 30, July 31, October 31, January 31 for quarterly filers; 15th of the following month for monthly filers). Simultaneously file Form WR-1 (Employment and Wage Detail Report) with DUA and the PFML quarterly return with DFML — all on the same quarterly due dates. Cross-check that PFML wages on the DFML return agree within $100 per employee to the WR-1 UI wages to avoid DFML discrepancy notices.

Before issuing W-2s, perform the Form M-3 reconciliation — totaling all 2025 M-941 filings against aggregate MA wages and MA income tax withheld per the planned W-2 Box 15/16/17 figures. Resolve any M-3 break (mid-year residence changes, late bonus checks, third-party sick pay) prior to printing W-2s to avoid W-2c reissuance. Issue Form MA 1099-HC to Massachusetts-resident employees by January 31 and file with the DOR. Submit Form M-3 and W-2s to DOR by January 31.

Confirm final-pay procedures satisfy the Massachusetts Wage Act (M.G.L. c. 149 §148): involuntary termination wages due same day; voluntary resignation wages due next regular payday. Review any independent contractors under the §148B ABC test — particularly Prong B (outside the usual course of business) — given Massachusetts's presumption-of-employment rule and mandatory treble-damages exposure under §150. Confirm earned sick leave accrual records (1 hour per 30 hours worked, up to 40 hours; paid if 11+ employees) and compliance with the salary history ban and, for 25+ employee employers, the Frances Perkins pay-range posting requirement effective October 29, 2025.