Maryland Estate Tax: What Surviving Families Actually Owe
Most Maryland families will never owe the state estate tax. But if the gross estate exceeds $5,000,000 — or if a surviving spouse wants to protect that threshold for the future — there are specific filings, deadlines, and strategies that matter enormously.
Maryland is one of only a handful of states with its own estate tax entirely separate from the federal system. Unlike the federal exemption, which adjusts for inflation each year, Maryland's $5,000,000 threshold is permanently fixed by statute. The legislature must act affirmatively to change it, and it has not been indexed since 2019.
What the Maryland Estate Tax Is (and Isn't)
The Maryland Estate Tax is a levy on the privilege of transferring property at death. It is not the same as the Maryland Inheritance Tax, which is a separate 10% charge on assets received by certain heirs. You can owe both, one, or neither — depending on the size of the estate and who inherits.
The estate tax applies when the decedent's gross estate exceeds $5,000,000 on the date of death. The gross estate includes probate assets (assets passing through the Register of Wills) plus non-probate assets — jointly held property, payable-on-death accounts, IRAs, life insurance, and revocable trusts are all counted. The maximum tax rate is 16%, applied on a graduated scale using the federal credit calculation.
Direct lineal heirs — surviving spouses, children, grandchildren, parents, and siblings — are completely exempt from the Maryland Inheritance Tax. But that exemption does not affect the estate tax calculation. If the estate is large enough, it owes the estate tax regardless of who inherits.
Who Must File Form MET-1
If the gross estate (probate plus non-probate) exceeds $5,000,000, the Personal Representative must file Form MET-1 (Maryland Estate Tax Return) with the Comptroller of Maryland. The deadline is nine months from the date of death, with a possible six-month extension.
A six-month extension to file does not extend the deadline to pay any tax due. Interest accrues on unpaid balances from the nine-month mark.
Even when no tax is owed — because the estate falls below the threshold — there is one situation where filing Form MET-1 is strongly advisable: when a surviving spouse wants to lock in the deceased spouse's unused exclusion.
The Portability Election: Why Smaller Estates Still File
Since 2019, Maryland allows "portability" of the estate tax exclusion between spouses. If the first spouse to die leaves an estate of $1,000,000, their remaining $4,000,000 exclusion can be transferred to the surviving spouse — but only if the executor files a timely Form MET-1 and makes the portability election.
A surviving spouse who secures this election carries a combined exclusion of up to $10,000,000, protecting a substantial portion of wealth from Maryland's 16% maximum rate. Failing to file forfeits this protection permanently.
Even if no federal estate tax return is required, a pro forma federal Form 706 may need to be filed alongside Form MET-1 to satisfy the portability mechanics. This is a situation where engaging a CPA or estate attorney pays for itself.
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Agricultural Property: The 5% Cap
Maryland provides a meaningful carve-out for family farms. If a gross estate exceeds the $5,000,000 threshold but includes qualified agricultural property, the effective Maryland estate tax rate on that agricultural portion cannot exceed 5%. The estate must file Schedule E with the Comptroller to claim this treatment, and the property must meet statutory definitions of agricultural use.
This provision is significant for farming families in Western Maryland and the Eastern Shore, where land values can push an otherwise modest estate over the threshold.
How Maryland Estate Tax Differs from Federal
The federal estate tax exemption for 2026 is substantially higher than Maryland's — the gap matters for planning. A married couple with a combined estate well below the federal threshold could still face Maryland estate tax if assets are not distributed efficiently between spouses or sheltered through trust structures.
Maryland does not allow "QTIP" marital deductions to defer the state estate tax the same way as federal law in all circumstances, making the timing of the first spouse's death and the configuration of their estate documents particularly consequential. This is not a DIY planning area.
The Inheritance Tax Interaction
When both taxes potentially apply, the Maryland Inheritance Tax paid by a collateral heir is allowed as a credit against the Maryland Estate Tax owed. This prevents strict double-taxation on the same transfer, but the credit calculation must be handled correctly on Form MET-1.
For a surviving spouse inheriting everything, there is no inheritance tax (spouses are fully exempt), but the estate tax still applies if the gross estate exceeds $5,000,000.
What Surviving Families Should Do First
If the estate is clearly below $5,000,000 and there is no surviving spouse claiming portability, no Maryland estate tax filing is required. The Personal Representative still needs to file the Information Report (Form RW1124) with the Register of Wills to disclose non-probate assets for inheritance tax purposes — but that is a separate process from the estate tax.
If the estate is near or above $5,000,000, or if portability is worth preserving, the estate needs a CPA and possibly an estate attorney before the nine-month deadline passes.
The Maryland Survivor Benefits Navigator walks through the full scope of tax filings, statutory deadlines, and agency interactions — including the Form MET-1 process, the Information Report, and how estate tax intersects with the probate administration timeline.
Key Numbers to Remember
- $5,000,000 — Maryland estate tax exclusion (not inflation-indexed)
- 16% — maximum Maryland estate tax rate
- 9 months — deadline to file Form MET-1 after date of death
- 5% — maximum rate on qualified agricultural property
- Portability — available since 2019; requires timely MET-1 filing even if no tax is due
Maryland's estate tax is one of the more consequential state-level taxes in the country for upper-middle-income families — because the $5,000,000 threshold is well below the federal ceiling, catching estates that federal planning would otherwise overlook entirely.
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