Workers’ Compensation Forms and Information Home / Documents & Forms / Attachments Workers’ Compensation, Insurance Affidavit: For Builders, Contractors, Electricians and Plumbers File extension: pdf File size: 102 kB Workers’ Compensation Insurance Affidavit: For General Businesses File extension: pdf File size: 101 kB Employees Guide to the Massachusetts Workers’ Compensation System File extension: pdf File size: 88 kB