Who is require to withhold? • Withholding Agent.If you have any doubt about the requirement to withhold, go ahead and do it and use a Form 1042. Use the free New Jersey Online Filing Service to file your 2024 NJ-1040 return. It's simple and easy to follow the instructions, complete your NJ tax return,. An official website of the Commonwealth of Massachusetts. Here's how you know Official websites use .mass.gov. ▷ Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Your tax return and completely fill in the. Official website of the Commonwealth of Massachusetts.