Required Forms for Probate in Massachusetts Estate Tax

If you’re handling a loved one’s estate in Massachusetts, figuring out which forms you need for probate and estate tax can feel overwhelming. The state doesn’t have an inheritance tax, but it does impose an estate tax and that means paperwork. Getting the right documents filed correctly and on time avoids delays, penalties, or even legal hiccups down the road.

What’s the difference between probate forms and estate tax forms?

Probate is the court process that wraps up a person’s legal and financial affairs after they die. Estate tax is a separate calculation based on the total value of what they owned. In Massachusetts, if the estate is worth more than $2 million (as of 2024), you’ll likely owe estate tax and that triggers specific filings with both the probate court and the Department of Revenue.

Which forms do I actually need to file?

The exact list depends on whether you’re going through formal probate, informal probate, or filing just for tax purposes. But here are the most common ones:

MPC 150 – Petition for Probate: Starts the probate case if there’s a will.
MPC 160 – Statement of Claimant (if no will): Used when someone dies without a will.
Form M-706 – Massachusetts Estate Tax Return: Required if the gross estate exceeds the $2 million threshold. Even if no tax is due, you may still need to file this to get a closing letter from the state.
Inventory of Assets (MPC 340): Lists everything the deceased owned real estate, bank accounts, vehicles, etc.
Notice of Filing of Inventory (MPC 350): Sent to heirs and creditors once the inventory is filed.

You can find walkthroughs for each of these in our guide to required forms for probate in Massachusetts estate tax, including where to download them and how to avoid common errors.

When should I file these forms?

Timing matters. The estate tax return (Form M-706) is due nine months after the date of death. If you miss that deadline, interest and penalties start piling up. Probate petitions can be filed as soon as you have the death certificate and will (if any), but don’t wait too long delays can complicate asset transfers or creditor claims.

What trips people up most often?

One big mistake: assuming that because Massachusetts doesn’t have an inheritance tax, you don’t need to file anything. That’s not true. Even estates under $2 million sometimes need to file Form M-706 to clear title on real estate or satisfy lenders.

Another common error: listing incomplete or inaccurate asset values on the inventory. If you lowball the value of a home or omit a brokerage account, the Department of Revenue may audit the return and that slows everything down.

Also, many people forget to notify all heirs and creditors after filing the inventory. Skipping that step can lead to disputes or objections later, especially if someone feels left out.

Do I need a lawyer for this?

Not always. If the estate is straightforward no debts, clear beneficiaries, assets well under the tax threshold you might handle it yourself using resources like the probate court process explained here. But if there’s conflict among heirs, complex assets (like businesses or out-of-state property), or potential tax liability, talking to an attorney who knows Massachusetts probate law is smart.

Where can I get help filling these out?

The Massachusetts Probate and Family Court website has fillable PDFs and instructions, but they’re not always easy to follow. For clearer guidance on completing tax-related paperwork, check out this step-by-step breakdown. It walks through Form M-706 line by line, with examples based on real scenarios.

For deeper context on what documents support your filings like deeds, account statements, or appraisals see our documentation guide.

You can also reference the official state instructions at the Massachusetts Department of Revenue estate tax page.

What’s my next step?

Start by gathering three things: the death certificate, the original will (if there is one), and a rough list of assets with their estimated values. From there, decide whether you’re opening probate, filing taxes, or both. Then pull the correct forms and double-check deadlines before you submit anything.