Maryland Bonus Calculator
Bonus Details
Federal W-4 Settings
Maryland Withholding (Form MW507)
Deductions (Per Regular Paycheck)
Year-To-Date Data (Optional, Improves Accuracy)
Your Bonus Estimate
- Bonuses are not taxed at a special bonus rate when you file. They are ordinary income taxed at your regular marginal rate.
- The 22 percent federal flat rate is simply a withholding method employers use on supplemental wages paid separately. It is not a tax rate.
- Maryland has a flat 6.5 percent supplemental withholding rate for separately paid bonuses. This is the state’s highest marginal rate. Your local county tax rate is added on top.
- The aggregate method combines your bonus with regular wages and applies your progressive brackets and standard deduction. The bonus portion equals the difference between combined withholding and regular-only withholding.
- All 23 Maryland counties and Baltimore City levy local income taxes ranging from 2.25% to 3.30%.
- When you file your return, your total annual income determines your true liability. Over-withholding on the bonus becomes part of your refund. Under-withholding becomes tax due.
- Gross-up mode solves for the gross bonus your employer must pay so your take-home equals the target you enter.
What Is the Maryland Bonus Calculator?
The Maryland Bonus Calculator is a payroll withholding estimator based on the 2025 federal and Maryland settings programmed into the tool. It uses your bonus, annual salary, pay frequency, federal W-4 information, Maryland MW507 settings, local county tax rate, deductions, and optional year-to-date payroll data.
A Maryland bonus calculator estimates bonus take-home by subtracting federal withholding, Maryland state tax, Maryland local tax, Social Security, Medicare, and applicable Additional Medicare withholding from the gross bonus. It can also calculate the gross bonus required to produce a specific after-withholding amount using its gross-up mode.
The results include your bonus take-home, effective withholding rate, tax breakdown, full-pay-period net pay, estimated annual federal and Maryland taxes, projected annual income tax withholding, and a projected refund or amount due based on the information entered.
How the Maryland Bonus Calculator Withholding Method Works
The calculator starts with the gross bonus and subtracts every withholding amount assigned to the bonus.
- B is the gross bonus.
- F is federal income tax withholding on the bonus.
- SS is Social Security withholding assigned to the bonus.
- M is Medicare withholding on the bonus.
- AM is Additional Medicare withholding assigned to the bonus.
- MD is Maryland state income tax withholding.
- L is Maryland local income tax withholding.
Under the Maryland flat method, the code applies 6.5% state withholding plus the local county percentage you enter.
Here, r is the local rate entered as a percentage and converted to decimal form. For example, 3.20% becomes 0.032.
The Maryland aggregate method adds the bonus to regular taxable wages. It annualizes that amount and applies Maryland's programmed standard deduction, exemptions, progressive brackets, and local rate. It then subtracts regular-only state and local withholding. Extra Maryland withholding per check is excluded from this bonus difference calculation.
Federal flat withholding uses 22% below the programmed $1,000,000 supplemental-wage threshold and 37% above it. Social Security uses 6.2% up to the remaining $176,100 wage base. Medicare is 1.45%, while Additional Medicare uses 0.9% above the programmed $200,000 wage threshold.
Worked Example
Assume a $5,000 gross bonus, a $75,000 salary, biweekly pay, federal flat withholding, Maryland flat withholding, a 3.20% local rate, and no prior year-to-date wages.
- Federal withholding: $5,000 × 22% = $1,100.
- Maryland state withholding: $5,000 × 6.5% = $325.
- Maryland local withholding: $5,000 × 3.20% = $160.
- Social Security: $5,000 × 6.2% = $310.
- Medicare: $5,000 × 1.45% = $72.50.
- Additional Medicare withholding is $0 because the programmed threshold is not reached.
Total bonus withholding is $1,967.50. The estimated bonus take-home is $3,032.50, giving an effective withholding rate of 39.35%. Gross-up mode repeatedly tests gross amounts until the calculated net reaches the requested target, then rounds the required gross bonus upward to the nearest cent.
How to Use the Maryland Bonus Calculator: Step by Step
- Choose estimate mode to start with a gross bonus, or gross-up mode to enter your desired take-home amount.
- Enter the bonus amount. The calculator requires a value greater than zero.
- Select the federal bonus withholding method. Choose flat 22% or aggregate withholding.
- Select the Maryland bonus withholding method. Choose flat 6.5% plus local tax or the aggregate method.
- Enter your base annual salary and select weekly, biweekly, semimonthly, or monthly pay frequency.
- Select your federal filing status and enter any applicable W-4 Step 2, Step 3, Step 4(a), Step 4(b), and Step 4(c) information.
- Select Single or Married / Head of Household for Maryland filing status.
- Enter your number of Maryland exemptions, local county tax percentage, and any extra Maryland withholding per regular paycheck.
- Enter pre-tax and post-tax deductions that apply to each regular paycheck.
- Add optional year-to-date Social Security wages, Medicare wages, federal supplemental wages, completed pay periods, and federal and Maryland withholding already paid.
- Check the acknowledgment that the result is an estimate, then calculate your bonus take-home.
The main result shows the estimated bonus amount left after withholding. The breakdown separates federal tax, Maryland state tax, local tax, Social Security, Medicare, and Additional Medicare. You can also review the alternative withholding methods, full-pay-period take-home pay, annual income estimates, projected withholding, and estimated refund or balance due.
Factors That Can Affect Your Maryland Bonus Calculator Result
State and Local Withholding Both Matter
The flat Maryland method includes two separate amounts. The calculator applies 6.5% state withholding and the local percentage you enter. The default local rate after a reset is 3.20%. The code does not identify your county automatically, so the local rate depends entirely on your entry.
| Calculator Setting | Value Used by Code |
|---|---|
| Maryland flat bonus state rate | 6.5% |
| Default local tax rate | 3.20% |
| Exemption deduction | $3,200 each |
| Maryland standard deduction formula | 15% of annual wages, subject to limits |
| Federal flat supplemental rate | 22% |
| Federal rate above threshold | 37% |
| Social Security rate | 6.2% |
| Social Security wage base | $176,100 |
| Medicare rate | 1.45% |
| Additional Medicare rate | 0.9% above $200,000 |
Standard Deductions and Exemptions Affect Aggregate Withholding
The code calculates the Maryland standard deduction as 15% of annualized taxable wages. For Single status, it is limited to at least $1,500 and no more than $3,350. For Married / Head of Household, the limits are $3,000 and $6,700. The calculator then subtracts $3,200 for each whole-number exemption.
Maryland Uses Progressive Rates for Aggregate Calculations
The programmed Maryland state rates run from 2% through 6.5%. The exact bracket thresholds depend on the selected Maryland filing status. Aggregate bonus withholding can therefore differ from the flat method because it uses taxable annualized wages rather than applying 6.5% directly to the bonus.
Regular Maryland Withholding Has a $5,000 Gross-Wage Check
The regular Maryland withholding function returns zero state and local withholding when the annual gross-wage value passed to it is below $5,000. In aggregate bonus calculations, the code also tests annualized combined regular pay and bonus against this condition.
Deductions and Year-to-Date Data Change the Estimate
Pre-tax deductions reduce regular federal and Maryland taxable wages. They do not reduce Social Security or Medicare wages in this calculator. Post-tax deductions affect only displayed take-home pay. Each deduction is capped at one regular paycheck's gross pay.
Year-to-date Social Security wages affect the remaining wage base. Medicare wages affect Additional Medicare withholding. Federal supplemental wages determine whether part of the bonus reaches the 37% federal withholding level. Completed pay periods and prior federal and Maryland withholding affect the annual refund or amount-due projection.
The calculator accepts nonnegative numeric inputs up to $1 billion, while the bonus must exceed zero. Results are estimates based on the 2025 rules and assumptions programmed into the calculator. Actual payroll or final tax results may vary because of employer procedures, local rates, other income, deductions, credits, tax-law changes, and information not entered. This tool is not tax, payroll, financial, or legal advice.
Frequently Asked Questions
How much tax is withheld from a bonus in Maryland?
The amount depends on your selected methods and payroll details. With the calculator's flat options, a bonus can include 22% federal withholding, 6.5% Maryland state withholding, your entered local tax rate, up to 6.2% Social Security, and 1.45% Medicare. Additional Medicare may also apply.
What Maryland bonus withholding rate does this calculator use?
The calculator uses 6.5% for Maryland state withholding when you select the flat bonus method. It also adds the local county rate entered in the calculator. For example, with a 3.20% local rate, the state and local flat withholding percentages together equal 9.70% of the gross bonus.
Does the Maryland Bonus Calculator include county tax?
Yes. The calculator includes a Local County Tax Rate field and starts at 3.20% after a reset. You can replace that percentage with the rate you want to use. The calculator does not select a county or determine the correct local percentage automatically.
What is the difference between flat and aggregate Maryland bonus withholding?
The flat method applies 6.5% state withholding plus the entered local rate directly to the bonus. The aggregate method combines the bonus with regular wages, annualizes the result, applies Maryland deductions and progressive brackets, and subtracts regular-only state and local withholding to determine the bonus portion.
Is the 22% federal bonus rate my final federal tax rate?
No. The calculator treats 22% as a federal supplemental withholding method rather than a final tax rate. Its annual federal estimate separately uses the programmed 2025 federal tax brackets, filing status, standard deduction, W-4 adjustments, dependent credits, and applicable pre-tax regular-pay deductions.
How does the Maryland bonus gross-up calculator work?
Gross-up mode starts with the after-withholding amount you want to receive. The code repeatedly tests different gross bonuses through the same federal, Maryland, local, Social Security, and Medicare calculations. It narrows the result until the net reaches at least your target, then rounds the gross amount upward to the nearest cent.
How accurate is the Maryland Bonus Calculator?
The calculator provides an estimate based on its programmed 2025 federal and Maryland formulas and the values you enter. Actual withholding and final tax liability may differ because of payroll practices, local tax rates, other income, credits, deductions, incomplete year-to-date information, tax changes, or circumstances the calculator does not model.