Moving from Canada to Maryland: County Piggyback Tax, DC Reciprocity, and the Cross-Border Picture

Maryland’s state income tax looks modest on paper, eight brackets running from 2% to 5.75%, until you notice the second line on the return. Every Maryland county, plus Baltimore City, charges its own “piggyback” income tax on top of the state rate, and it isn’t optional. For a Canadian landing in Bethesda, Silver Spring, or Columbia to take a federal government, consulting, defense, or tech role, the county tax is the number that actually determines the paycheck, and in Montgomery, Howard, or Prince George’s counties it’s the highest local add-on in the state. The federal cross-border obligations, departure tax, RRSP and TFSA reporting, work the same regardless of which county line the new lease sits inside.

How does Maryland’s tax compare to provinces?

Maryland’s top state rate, 5.75%, sits well below every Canadian province’s top combined rate, but that comparison alone undersells what actually lands on a Maryland pay stub, because the county tax is not optional and is not small.

Jurisdiction	Top rate	Notes
Ontario	~20.5% (with surtax)	On income above $220,000
BC	20.5%	On income above $252,752
Alberta	15%	On income above $355,845
Quebec	25.75%	On income above $126,000
Maryland (state only)	5.75%	Above $250,000 single / $300,000 joint
Maryland (state + Montgomery County)	~8.95%	Combined, at the top bracket

Maryland’s own state bracket structure for single filers looks like this (joint filers get wider brackets at the lower end):

Rate	Income range (single)
2.00%	$0 to $1,000
3.00%	$1,000 to $2,000
4.00%	$2,000 to $3,000
4.75%	$3,000 to $100,000
5.00%	$100,000 to $125,000
5.25%	$125,000 to $150,000
5.50%	$150,000 to $250,000
5.75%	Above $250,000

Notice how flat most of that structure is: from $3,000 up to $100,000, everything sits at 4.75%. The bracket movement above that point is gradual, a quarter point at a time, and the top rate doesn’t kick in until $250,000 for a single filer or $300,000 for joint filers. That’s the state layer only. The county tax, covered next, is what changes the real answer.

How do Maryland’s county taxes work?

This is the feature of Maryland’s system that catches Canadians off guard, because nothing in the state’s own bracket table above hints at it. Maryland requires every one of its 23 counties, plus Baltimore City, to levy a local income tax on top of the state tax, collected on the same state return through the same withholding, but calculated at a rate the county sets within a range the state allows.

The rates run from about 2.25% in Worcester County (the Eastern Shore, home to Ocean City) up to 3.2%, the state-imposed ceiling, in Howard, Montgomery, and Prince George’s counties, which happen to be the three counties that anchor the DC suburbs. Baltimore City and Baltimore County both sit at 3.2% as well. There is no county in Maryland where the local add-on is zero.

Stack the top state bracket and the top county rate together and the combined marginal rate in Montgomery or Prince George’s County reaches roughly 8.95%, and once Baltimore City’s own separate mechanics are factored in, some filers see figures described as approaching 9%. That combined number is the one that matters for a Canadian comparing a Maryland offer to a Virginia or DC one, not the 5.75% headline state rate, because the county piece isn’t a discretionary local add-on the way, say, an Ohio municipal tax can sometimes be avoided. It’s baked into the Maryland filing itself, assessed by county of residence as of the end of the tax year, and there’s no county in the state where the effective floor is meaningfully lower than the others once you’re in the mid-to-upper brackets.

For the Canadians in the federal government, consulting, defense, and tech corridor, this almost always means Montgomery County (Bethesda, Rockville, Silver Spring) or Prince George’s County (College Park, Bowie, Hyattsville), both at the 3.2% ceiling, or Howard County (Columbia, Ellicott City), also at 3.2%. Someone choosing between a Montgomery County address and a lower-piggyback county further out, Frederick County runs 2.96%, for instance, is trading commute distance for a modest rate difference, not a dramatic one.

How does Maryland treat the RRSP?

Maryland is a federal-conforming state: it starts the state return from federal adjusted gross income and layers its own additions and subtractions on top, rather than defining its own income categories the way New Jersey does. That matters directly for the RRSP question.

Because the Canada-US tax treaty defers US tax on RRSP growth until distribution, and Maryland’s starting point is federal AGI, that same deferral flows through to the Maryland return automatically. There’s no separate Maryland election or add-back required to preserve it, and no Maryland-specific statute that reaches inside an undistributed RRSP the way a small number of non-conforming states can. When distributions do happen, they show up in federal AGI as pension or IRA-type income and get taxed by Maryland the same way, at the applicable state and county rates.

The TFSA doesn’t get the same protection, because the treaty deferral is an RRSP-specific provision, not a general shield for Canadian registered accounts. Since federal AGI already includes TFSA investment income under US rules (the treaty doesn’t recognize the TFSA at all), that income flows straight into Maryland’s tax base along with everything else. The standard move still applies: close the TFSA before leaving Canada, because keeping it open converts a tax-free Canadian account into an account that generates US paperwork (PFIC and foreign trust reporting questions, depending on structure) with no offsetting benefit once you’re a Maryland resident.

What happens on the Canadian side?

The same departure sequence applies regardless of which US state comes next:

• Deemed disposition at fair market value of worldwide assets
• Final Canadian return from January 1 to the departure date
• Provincial tax at the rates of your province of residence on departure day
• T1161 and T1243 if applicable
• CRA non-resident notification
• RRSP left open (treaty deferral applies), TFSA closed

On the US side, the arrival-year return is either a dual-status return or a full-year election, and the mechanics of that first return are covered in the first US tax return guide.

What other taxes does Maryland have?

Maryland’s sales tax is a flat 6% statewide, with no local add-ons the way many states allow, and groceries are exempt. Compared to Ontario’s 13% HST, which reaches most goods and a wide range of services, Maryland’s base is narrower and the rate lower, though the exemption list is also narrower than a full grocery exemption in some other states.

Property taxes vary modestly by county rather than swinging wildly: Montgomery County runs close to 1% effective, Baltimore County around 1.1%, and Howard County near 1%. None of that approaches New Jersey or Illinois territory, but it isn’t nominal either, particularly against the home values in Bethesda or Columbia.

The estate and inheritance picture is where Maryland stands apart from almost every other state in this series, because Maryland charges both taxes at once, a combination only Maryland and a couple of other states still maintain. The state estate tax applies above a $5 million exemption, a fraction of the current federal exemption of $13.61 million, at rates up to 16% on the portion above that threshold. Separately, Maryland’s inheritance tax applies to who receives the money, not how much the estate is worth: spouses, parents, children, grandchildren, and other lineal relatives are exempt entirely, while non-lineal heirs, siblings, nieces, nephews, friends, and unrelated beneficiaries, owe 10% on what they receive. An estate can trigger both taxes on the same assets if it’s large enough and leaves money to both kinds of beneficiaries.

For a Canadian family settling in Maryland with meaningful assets or beneficiaries outside the immediate family, that $5 million estate exemption is worth planning around well before it becomes urgent, since it’s a fraction of the federal number many people assume applies everywhere. The cross-border estate planning guide covers freezes, alter ego structures, and the bypass planning that can pull assets out from under a state exemption that low.

What about working in DC from Maryland?

This is the reciprocity question, and it has a clean answer, which is unusual for a cross-jurisdiction commuter pattern. Maryland has a reciprocal agreement with both DC and Virginia covering wage income: a Maryland resident who works in DC (or Virginia) pays Maryland tax on those wages, not DC or Virginia tax, and doesn’t file a nonresident return in the work jurisdiction at all. The reverse holds too, a DC or Virginia resident working in Maryland pays tax to their home jurisdiction, not Maryland.

That’s a materially simpler setup than the New York/New Jersey commuter pattern, where both states tax the income and a credit closes the gap. For the federal government and defense contractor corridor especially, someone with a security clearance role at an agency headquartered in DC, or a role tied to Fort Meade and the NSA corridor that straddles Anne Arundel and Howard counties, the wage-tax picture stays entirely inside Maryland’s own state-plus-county calculation. The one thing reciprocity doesn’t touch is DC or Virginia-source income that isn’t wages, freelance or consulting income sourced to work performed in DC, for instance, can still create a filing obligation there depending on the specifics, so a W-2 employee and a 1099 consultant working the same commute don’t necessarily land in the same place.

What should I do next?

The Canadian exit follows the standard departure checklist no matter which Maryland county the new address sits in. On the Maryland side, the number worth getting right early is the combined state-plus-county rate for the specific county, not the 5.75% state headline, since that county piece is what actually separates a Montgomery County offer from a Frederick or Worcester County one. The DC and Virginia reciprocity agreement removes one layer of complexity that a New York or Philadelphia commute wouldn’t, which is a genuine advantage of the Maryland-DC corridor over other metro commuter patterns in this series.

• Departure tax checklist, the full Canadian exit sequence
• US-Canada tax treaty explained, the RRSP deferral mechanics
• RRSP and TFSA on a US move, federal treatment and reporting
• First US tax return after moving from Canada, the arrival-year mechanics
• Dual-status return or full-year election, choosing the arrival-year filing method
• State income tax on a cross-border move, the general framework this article applies to Maryland
• Canada departure tax, T1161 and T1243, the deemed disposition forms
• Cross-border estate planning, for the dual estate-and-inheritance-tax question
• Moving from Canada to New Jersey, a higher-tax DC-adjacent comparison
• Moving from Canada to Pennsylvania, a nearby Mid-Atlantic corridor
• Moving from Canada to North Carolina, a lower-tax alternative for comparison
• Moving from Canada to Virginia, the other side of the DC corridor, with no county income tax
• Moving from Canada to Washington DC, the district itself, with reciprocity for MD/VA workers
• Moving from BC to California, an RRSP-treatment contrast on the other coast

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.