Maryland Income Tax Calculator - Estimate MD State and County Tax From Your AGI

A Maryland income tax calculator is a tool that estimates the two layers of Maryland's resident income tax at once: the progressive state tax and the local county income tax. By starting from your federal adjusted gross income and applying the state subtractions most filers take, it shows how much you owe on your Maryland return for the year.

• • Annual Maryland resident return: Estimate the state and county tax you will owe when you file Form 502, before you sit down with the full return.
• • Compare counties at the same pay: See how moving between a 2.50% county and a 3.20% county changes your bill while your salary and filing status stay the same.
• • Plan withholdings from a paycheck tool: Pair the annual estimate with a Maryland paycheck calculator to check whether your per-paycheck withholding lines up with the year-end total.
• • Understand the effective rate: Convert the two combined layers into a single percentage of your gross income so you can compare Maryland with other states.

What surprises many people is that the county piece is not a small rounding error. Because the local rate applies to the entire Maryland taxable income rather than just a slice, the difference between a low-rate county and a high-rate county can add up to hundreds or thousands of dollars a year at typical salaries.

Maryland is one of only a handful of states that layer a county income tax this way, so a generic state income tax estimate will usually understate what a Maryland resident actually owes. Breaking the two layers apart is the whole point of this tool.

If you want to see how this annual tax shows up in each paycheck, the Maryland paycheck calculator splits the same state and county rates across the year with FICA.

The Maryland income tax calculation is a two-step process: first build Maryland taxable income from federal AGI, then apply the state brackets and the county rate to that same base.

• Maryland Taxable Income: Federal AGI minus the larger of the standard or itemized deduction and the personal exemptions at $3,200 each, plus any other subtractions.
• State Bracket Tax: The eight-rate schedule from 2.00% to 5.75% applied to Maryland taxable income, with wider ranges for married filing jointly.
• County Rate: The local income tax rate your county or Baltimore City sets, applied to the same Maryland taxable income.

The order of operations matters: the county rate multiplies the entire Maryland taxable income, so the local layer is not a small add-on. Every dollar you keep through an exemption also reduces the county bill proportionally, which is why the exemption matters more in a high-rate county.

According to Tax Foundation, Maryland combines a state individual income tax with local income taxes levied by counties and Baltimore City on the same base.

The county income tax is separate from what you pay on a home, which the Maryland property tax calculator estimates from local rates and assessed value.

Four ideas explain most of the variation you will see in the results, and they are worth keeping in mind before you change any input:

The personal exemption and the standard deduction are the two levers that move Maryland taxable income down before any rate is applied. A family of four with two children claims four exemptions, removing $12,800 before the brackets even start.

Because the county rate multiplies the same post-subtraction base, the two layers move together, which is why the exemption matters more in a high-rate county.

Because the state calc starts from your federal AGI, the federal income tax calculator shows the federal layer that feeds into these numbers.

Follow these four steps to estimate your Maryland income tax:

1. 1 Enter your federal AGI: Pull the adjusted gross income from your federal Form 1040. If you have an hourly or annual wage instead, convert it first so the AGI figure is complete.
2. 2 Pick filing status and county: Choose your Maryland filing status and the county or Baltimore City where you live. The county choice sets the local rate applied to your taxable income.
3. 3 Add exemptions and subtractions: Enter the number of personal exemptions you expect to claim and any other Maryland subtractions you know about, such as military or pension exclusions.
4. 4 Read the results: The output shows your Maryland taxable income, state tax, county tax, total, and effective rate, with the standard or itemized deduction chosen automatically for you.

A single filer in Montgomery County with $80,000 of federal AGI and one exemption lands at $73,950 of Maryland taxable income after the $2,850 standard deduction and one $3,200 exemption, producing about $3,460 of state tax and $2,366 of county tax.

If you have an hourly or annual wage rather than AGI, the salary calculator converts it before you enter it here.

Using a dedicated Maryland income tax calculator gives you several practical benefits compared with estimating by hand:

• • Splits the two layers: The output separates state tax from county tax, so you can see how much of your bill comes from the local piggyback rate rather than the state schedule.
• • Compares counties at the same income: You can see what you would owe living in different Maryland counties at the same pay, which is useful when deciding where to relocate or negotiate a salary.
• • Shows the effective rate: The effective rate answers the question your paycheck withholding does not: what share of your gross income goes to Maryland income tax once both layers are counted.
• • Picks the better deduction: The calculator automatically uses the larger of your itemized or standard deduction, so you do not have to decide which is better before entering numbers.

Treat the number as a planning estimate rather than the figure you send to the Comptroller. Credits, quarterly payments, and part-year residency all shift the final bill, but the estimate is close enough to compare scenarios and spot a county that costs you materially more.

Because the county rate scales with income, the tool is especially useful for higher earners, where a 0.70 percentage-point county gap translates into real money across a full base.

To see the full-year pay behind your AGI, the annual salary calculator converts a salary into the annual figure this estimator uses.

A handful of inputs drive almost all of the movement in the result, and understanding them helps you interpret the output:

• • This is an annual, full-year resident estimate. It does not model quarterly payments, credits, part-year residency, or local wage taxes beyond the county income tax.
• • The $3,200 personal exemption phases out at higher incomes; this estimator applies the flat amount and does not reduce it for high earners, so very high-income results may overstate the exemption benefit.

The combined state-plus-county rate is what matters for planning, and it is easy to overlook the county layer when you only look at the top state bracket. The split in the results keeps both visible.

According to Internal Revenue Service, federal adjusted gross income is the figure reported on Form 1040 that states begin from before applying state-specific subtractions, so the county gap compounds on top of that federal base.

Because every estimate here starts from your federal AGI, the AGI calculator walks through how that starting number is built before the Maryland subtractions apply.