Where and how to pay Maryland state income tax

Maryland accepts tax payments through three main channels: online through the Comptroller's website, by mail, or in person at a Comptroller office. The online method is fastest and most common — you can pay by bank account transfer (ACH) or credit/debit card, though card payments charge a processing fee. Mail payments go to the address listed on your tax form; in-person payments are available at Comptroller offices in Baltimore and other locations during business hours.

You do not need to wait until April 15 to pay. Many people pay throughout the year through withholding (your employer deducts it from your paycheck) or quarterly estimated payments if you are self-employed or have income not subject to withholding. The state also accepts payments when you file your return early, which can happen as soon as tax forms are released in late January or early February.

Key Takeaways

  • Online payment through the Maryland Comptroller's website is the fastest method and works by bank transfer or card, though cards charge a fee.
  • Mail payments should go to the address on your tax form; allow at least two weeks for processing to avoid late penalties.
  • Self-employed people and those with income not subject to withholding must make quarterly estimated tax payments on specific dates: April 15, June 15, September 15, and January 15.
  • Payments made after the April 15 deadline incur interest and penalties, even if you file an extension request.
  • You can pay any amount at any time; you do not have to wait until you file your full return.

Online payment through the Maryland Comptroller

The Maryland Comptroller's website (marylandtaxes.gov) has a payment portal where you can pay by ACH bank transfer or credit/debit card. ACH transfers are free and typically process within one to two business days. Card payments process immediately but charge a convenience fee — the exact amount depends on the payment processor and is shown before you confirm.

To pay online, you will need your Social Security number or federal employer ID number, the tax year you are paying for, and your payment method. You do not need to have filed your return yet. The system generates a confirmation number immediately; save or print this as your receipt. If you pay by card, the charge appears on your statement within one business day.

Mailing a check or money order

Mail payments should include a check or money order made payable to "Maryland Comptroller." Write your Social Security number and the tax year on the front of the check. The mailing address appears on your tax form (Form 502 for residents); if you do not have the form, the Comptroller's website lists the current address for tax payments.

Mail payments take two to three weeks to post to your account, so send them early if you are close to the April 15 deadline. The postmark date is what counts for timeliness, not the date the Comptroller receives it — but only if you mail it by April 15. Late payments incur interest at the rate set by the state (currently around 8 percent per year) plus a penalty, even if you filed an extension.

Quarterly estimated tax payments for self-employed and contract workers

If you are self-employed, a contractor, or have income that is not subject to withholding (such as rental income or investment income above a certain threshold), you must make quarterly estimated tax payments. These are due on April 15, June 15, September 15, and January 15. Each payment covers one quarter of your expected annual tax liability.

You can make quarterly payments online through the Comptroller's website, by mail, or in person. The online method is fastest. If you miss a quarterly deadline, you can still make the payment, but you will owe interest from the original due date. Many self-employed people use tax software or work with a tax preparer to calculate the correct quarterly amount; the Maryland Comptroller's website has a worksheet to help estimate if you prefer to do it yourself.

What happens if you pay late

Payments received after April 15 are subject to interest and a failure-to-pay penalty. Interest accrues from the original due date (April 15) at the rate set by the state each quarter — this rate is published on the Comptroller's website and changes every three months. The penalty is typically 0.5 percent of the unpaid tax per month, up to a maximum of 25 percent.

Filing an extension (Form 4868 with the IRS and a Maryland extension form with the state) gives you until October 15 to file your return, but it does not extend the payment deadline. Taxes are still due April 15, even if you have an extension. If you cannot pay by April 15, you can still file an extension and pay what you owe by October 15, but interest and penalties will apply to the unpaid amount from April 15 onward.

Payment plans and hardship options

If you cannot pay your full tax bill by April 15, the Maryland Comptroller offers installment agreements. You can request a payment plan through the Comptroller's website or by calling the tax payment line. The state will work with you to set up monthly payments over several months, though interest and penalties continue to accrue on the unpaid balance.

Installment agreements typically require a setup fee and monthly payments of at least $25. The exact terms depend on the amount owed and your circumstances. If you are facing financial hardship, contact the Comptroller's office directly — some penalties can be reduced or waived in cases of genuine hardship, though this is handled case by case and is not automatic.

Payments for business taxes and other Maryland taxes

Maryland also collects sales tax, corporate income tax, and other business taxes. Businesses file and pay these on different schedules depending on the tax type and the business structure. Sales tax is typically due monthly or quarterly; corporate income tax is usually due within two and a half months after the end of the tax year. Each has its own payment portal on the Comptroller's website.

If you own a business or are responsible for payroll taxes, the Comptroller's website has separate sections for each tax type with payment instructions, due dates, and forms. Many businesses use tax software or hire a tax professional to manage these payments on schedule.

Frequently Asked Questions

Can I pay Maryland taxes by credit card without a fee?

No. Credit and debit card payments through the official Comptroller portal charge a convenience fee set by the payment processor. ACH bank transfers are free. If you want to avoid the fee, use ACH or mail a check.

What if I pay too much?

If you overpay, the Comptroller will issue a refund or apply the overpayment to next year's taxes. Refunds are typically issued within four to six weeks if you file a return. You can also request that the overpayment be applied to the following year's estimated tax.

Do I have to pay Maryland taxes if I moved out of state?

Maryland taxes residents on all income earned during the time they lived in the state. If you moved partway through the year, you owe tax on income earned while you were a resident. Non-residents who earned income in Maryland may also owe tax on that income. Your tax situation depends on when you moved and where your income came from.

Can I pay someone else's Maryland taxes?

Yes. You can pay another person's taxes online or by mail if you have their Social Security number and tax year. The payment will be credited to their account. This is common for parents paying adult children's taxes or for people helping family members.

What if the payment deadline falls on a weekend?

If April 15 falls on a Saturday or Sunday, the deadline moves to the next business day (Monday). If a holiday falls on the deadline, it moves to the next business day after the holiday. The Comptroller's website announces the actual deadline each year.