How to Pay Maryland State Income Tax
Where and how to pay Maryland state income tax
Maryland accepts state income tax payments through three main channels: online through the Maryland Department of Revenue website, by mail, or through your employer if taxes are withheld from your paycheck. The online method is the fastest and most direct — you can pay from your bank account or by credit or debit card, though card payments charge a processing fee. If you prefer mail, you send a check or money order to the address listed on your tax notice or the department's website, but mail takes longer to process and arrives with no confirmation until your account updates.
The due date for Maryland state income tax is the same as the federal deadline: April 15 in most years, though it shifts if that date falls on a weekend or holiday. If you file an extension with the IRS, you automatically get an extension for Maryland as well, moving your deadline to October 15. Payments made after the due date accrue interest and penalties, even if you filed your return on time — the payment deadline and filing deadline are separate.
Key Takeaways
- Maryland's online payment system lets you pay from your bank account with no fee, or by card with a processing fee charged by the payment processor.
- The state income tax deadline matches the federal deadline of April 15, and an IRS extension automatically extends your Maryland deadline to October 15.
- Payments made after the due date incur interest and penalties, calculated from the original due date regardless of when you file your return.
- If you owe Maryland taxes, you can set up a payment plan through the Department of Revenue to pay in installments rather than a lump sum.
- Withholding from your paycheck is the most common way Maryland residents pay state income tax throughout the year, reducing what you owe at tax time.
Paying online through the Maryland Department of Revenue
The Maryland Department of Revenue operates a payment portal where you can pay state income tax, corporate taxes, and other state obligations. To pay online, you need your Social Security number or federal employer identification number, the tax year you are paying for, and the amount owed. You can pay from a checking or savings account using the ACH system — this method has no fee and typically processes within one to two business days. Alternatively, you can pay by credit or debit card, but the payment processor charges a fee (usually a percentage of the amount paid), which is added to your total cost.
The online system generates a confirmation number immediately after you submit payment. Write down or save this number — it proves you paid and when. The payment may not show in your account right away, especially if you paid by ACH, but the confirmation number is your receipt. If you need to dispute a payment or verify it was received, you will need this number and the date you submitted it.
Paying by mail or check
To pay by mail, write a check or money order payable to "Maryland Department of Revenue" and include your Social Security number on the check itself. Include a copy of your tax notice, your return, or a note stating the tax year and amount you are paying. Mail it to the address shown on your tax notice or on the department's website — the address varies depending on what type of tax you are paying and which office handles your account.
Mail payments take longer to process than online payments. The postal service typically takes three to seven business days to deliver, and the department may take an additional week to log the payment into your account. During this time, if you owe additional taxes or penalties, interest continues to accrue. If you are cutting it close to the deadline, mail is not the safest option — the postmark date counts as your payment date, not the date the department receives it, but delays still happen. Keep your receipt from the post office as proof of mailing.
Setting up a payment plan if you cannot pay in full
If you owe Maryland state income tax but cannot pay the full amount by the deadline, you can request an installment agreement through the Department of Revenue. This allows you to pay what you owe in smaller monthly payments rather than one lump sum. To set up a plan, contact the department directly — you can find the phone number and mailing address on your tax notice or the department's website. You will need to provide information about your income, expenses, and how much you can pay each month.
The department will propose a payment schedule based on what you can afford. Interest and penalties continue to accrue on the unpaid balance, so the longer you take to pay, the more you owe overall. However, a payment plan stops the department from taking collection actions like wage garnishment or bank levies while you are making regular payments. If you miss a payment on your plan, the agreement may be cancelled and collection actions may resume, so treat the plan as a binding commitment.
How withholding reduces what you owe at tax time
Most Maryland residents pay state income tax throughout the year through payroll withholding — money taken from each paycheck and sent to the state on your behalf. Your employer calculates the withholding based on the W-4 form you fill out when you are hired. The more dependents or deductions you claim on your W-4, the less is withheld; the fewer you claim, the more is withheld. If your withholding is accurate, you will owe little or nothing when you file your return in April. If too little was withheld, you will owe a balance; if too much was withheld, you will receive a refund.
You can adjust your withholding at any time by submitting a new W-4 to your employer. If you expect to owe money this year, increasing your withholding now reduces what you will owe in April. If you expect a large refund, decreasing your withholding lets you keep more money in each paycheck instead of lending it to the state interest-free. The Maryland Department of Revenue website has a withholding calculator to help you estimate whether your current withholding is on track.
What happens if you pay late
Payments received after April 15 (or October 15 if you have an extension) incur interest and penalties. Interest is calculated daily from the original due date — April 15 — and compounds, meaning you pay interest on the interest. The penalty for late payment is typically a percentage of the unpaid tax, assessed once. Both interest and penalties apply whether you filed your return on time or late; the key date is when the payment arrives, not when you filed.
If you owe a substantial amount and cannot pay, do not ignore the bill. The Maryland Department of Revenue can place a lien on your property, garnish your wages, or intercept your state tax refund to cover what you owe. Contacting the department to set up a payment plan or discuss hardship options stops these collection actions while you work out a solution. Waiting makes the debt larger and the consequences more severe.
Frequently Asked Questions
Can I pay Maryland state income tax with a credit card?
Yes, but a processing fee applies — usually 2 to 3 percent of the amount paid. The fee is charged by the payment processor, not the state, and is added to your total cost. Paying by bank account through ACH has no fee, so that method costs less if you have the option.
What if I filed my return on time but cannot pay by April 15?
File your return by the deadline even if you cannot pay. Interest and penalties apply only to the unpaid tax, not to late filing. Then contact the Department of Revenue to set up a payment plan or discuss your options. Paying late is better than not filing at all.
Do I need to pay Maryland state tax if I only worked part of the year?
It depends on how much you earned. Maryland has a standard deduction that changes each year — if your income is below that amount, you may not owe state tax. File a return to find out for certain, or use the department's tax calculator on their website to estimate what you owe.
If I get a refund, how long does it take to arrive?
Refunds typically arrive within four to six weeks if you filed electronically and chose direct deposit. Paper checks take longer — up to eight weeks. You can check the status of your refund on the Maryland Department of Revenue website using your Social Security number and the amount of your refund.
What if my employer did not withhold enough Maryland tax?
You will owe the difference when you file your return. To avoid this next year, adjust your W-4 to increase withholding, or make estimated tax payments quarterly if you have income that is not subject to withholding (like self-employment income or investment income).