If you’re handling a loved one’s estate in Massachusetts, figuring out what paperwork you need and when can feel overwhelming. The state doesn’t have a traditional inheritance tax, but it does impose an estate tax that affects many families. Getting the documentation right matters because missing a form or filing late could delay distributions or trigger penalties.

What’s the difference between estate tax and inheritance tax here?

Massachusetts doesn’t charge beneficiaries for receiving assets that’s what most people think of as “inheritance tax.” Instead, the state taxes the estate itself if its total value exceeds $2 million. This is called an estate tax, but many still refer to the process as dealing with “inheritance tax documentation” because they’re sorting out what gets passed down after someone dies.

When do I actually need to file these forms?

You’ll need to file a Massachusetts Estate Tax Return (Form M-706) if the gross estate plus adjusted taxable gifts is worth more than $2 million at the time of death. Even if no tax is due, some estates still need to file to get a closing letter from the state which banks and title companies often require before releasing assets.

If you’re unsure whether you need to file, check out our breakdown of what triggers the requirement. It walks through common thresholds and exceptions.

What documents will I need to gather?

Start with the basics: the death certificate, will (if there is one), and any trust documents. Then collect statements showing the value of bank accounts, real estate, investments, life insurance proceeds, and personal property as of the date of death.

You’ll also need records of debts, funeral expenses, and administrative costs these can reduce the taxable estate. If the deceased owned property jointly or gave away significant assets before passing, those details matter too.

A full list of required probate forms is available in our guide to probate paperwork in Massachusetts.

Where do these forms get filed?

The Massachusetts Estate Tax Return goes to the Department of Revenue, not the probate court. But don’t skip probate entirely if there’s a will or assets that need legal transfer, you’ll likely need to open a case in probate court too. Learn how the two processes interact in our overview of the probate court’s role in estate taxes.

What are the most common mistakes people make?

  • Missing the nine-month deadline. The return is due nine months after death, with possible extensions.
  • Overvaluing or undervaluing assets. Real estate should be appraised as of the date of death, not purchase price or current market guesses.
  • Not accounting for lifetime gifts. Gifts over the annual exclusion made within three years of death may be added back into the estate.
  • Filing without a federal return when required. If a federal estate tax return (Form 706) is needed, Massachusetts requires it too.

Can I fill out these forms myself?

Yes if the estate is straightforward and under the taxable threshold, many executors handle it without professional help. But if the estate includes businesses, multiple properties, or complex assets, it’s worth consulting a local attorney or CPA. Mistakes on Form M-706 can lead to audits or delays in closing the estate.

For a step-by-step walkthrough, see our instructions on how to complete the state’s estate tax forms.

What if the estate owes tax?

Payment is due when you file the return. If you can’t pay in full, you may request an installment plan but interest will accrue. Don’t wait to file while you figure out payment; file on time and communicate with the Department of Revenue about your situation.

Are there any recent changes I should know about?

As of 2024, the $2 million exemption hasn’t changed, but proposed legislation could adjust it in future years. Always check the Massachusetts DOR website for updates before filing.

Do I need to file anything with the probate court separately?

Yes. Probate court handles validating the will, appointing the executor, and overseeing asset distribution. While the estate tax return goes to the DOR, you may need to submit proof of filing (or payment) to the court before closing the estate. Find the specific probate forms tied to inheritance tax reporting to ensure nothing gets missed.

Next step: Gather the death certificate, will, and a rough inventory of assets. If the total likely exceeds $2 million, start pulling financial records now and mark your calendar for the nine-month deadline.