How to Pay Your Montgomery County Property Tax in Maryland

Where and how to pay Montgomery County property tax

Montgomery County collects property taxes through the Department of Finance. You can pay online through the county's website, by mail, in person at the Finance Department office, or by phone. Online payment is the fastest route—the county accepts it 24 hours a day, and you'll see confirmation immediately. If you pay by mail, send your check to the address on your tax bill and allow at least 10 business days for processing. In-person payments are accepted at the Finance Department in Rockville during business hours, Monday through Friday.

The county also accepts automatic bank transfers (ACH payments) if you want the same amount deducted on the same date each year. This is useful if your property tax stays stable and you want to remove the task from your calendar. Phone payments are available but typically charge a convenience fee, so they're best used only when you're close to a deadline and can't pay online.

Key Takeaways

• Montgomery County property taxes are due in two installments: the first half in September and the second half in March, though exact dates vary by year.
• Online payment through the county website is free, available 24/7, and shows confirmation immediately.
• If you pay by mail, allow at least 10 business days for your check to clear and post to your account.
• Late payments trigger a penalty and interest charges that compound monthly, so paying on time saves money even if you have to use a convenience fee.
• The county offers payment plans and tax deferral programs for homeowners over 65 or with low income, which you can explore through the Finance Department.

When property taxes are due in Montgomery County

Montgomery County splits property tax into two payments per year. The first installment is due in September, and the second is due in March. The exact due date shifts slightly each year because it's tied to the county's fiscal calendar. Your tax bill will show the specific date for your payment—check the bill itself rather than relying on a date you remember from last year.

If you miss the due date, the county charges a penalty on the unpaid amount. The penalty starts at a percentage of what you owe and increases if the bill stays unpaid. Interest also accrues monthly on the overdue balance. Together, these charges can add hundreds of dollars to your debt over time, so even if you have to borrow or use a payment method with a fee, paying on time is usually cheaper than paying late.

How to set up online payment

Go to the Montgomery County Department of Finance website and look for the property tax payment portal. You'll need your property account number, which appears on your tax bill. The portal will ask for the amount you want to pay and your bank account information if you're paying by electronic transfer. The system processes most payments the same day and sends you a confirmation number immediately—save this number in case you need to prove payment later.

Online payment is free and works whether you're paying the full amount or a partial payment. If you're paying a partial amount, the county will apply it to whichever installment is currently due. You can also set up a one-time payment or schedule recurring payments if you want to split the bill into monthly amounts (though the county still expects the full installment by the official due date).

What happens if you pay late

A late payment triggers two separate charges: a penalty and interest. The penalty is calculated as a percentage of the unpaid tax and is assessed once. Interest is calculated monthly on the unpaid balance and compounds—meaning you pay interest on the interest if the bill stays unpaid for several months. Both charges are added to what you owe, so your total debt grows each month you don't pay.

If your bill remains unpaid for a long time, the county can place a lien on your property. A lien is a legal claim that gives the county the right to be paid before you can sell the house or refinance a mortgage. The lien doesn't force you out of your home, but it does complicate any future sale or loan. If you're struggling to pay, contact the Finance Department before the due date to ask about payment plans or deferral programs rather than waiting until a lien is filed.

Payment plans and tax deferral for may have access to homeowners

Montgomery County offers a property tax deferral program for homeowners age 65 or older and for homeowners with low income who meet certain thresholds. Deferral postpones your tax payment—you don't pay it now, but the debt remains on your property and must be paid when you sell the house or when the property transfers. The county charges interest on the deferred amount, so you'll owe more later, but deferral can free up cash if you're on a fixed income.

The county also works with homeowners who can't pay the full amount by the due date. Contact the Department of Finance directly to discuss a payment plan. Plans are usually negotiated case-by-case and may allow you to pay in installments over several months. The sooner you reach out, the more options you'll have—waiting until after the due date limits what the county can offer.

Understanding your property tax bill

Your tax bill shows the assessed value of your property, the tax rate, and the amount you owe for each installment. The assessed value is set by the county assessor and may differ from what you paid for the house or what it would sell for today. If you believe the assessment is wrong, you can file a assessment appeal with the county, though this is a separate process from paying your tax and doesn't delay your payment deadline.

The bill also lists any exemptions or credits you may be receiving—for example, homestead property tax credits for primary residences, or exemptions for certain disabilities or military service. If you think you may have access to for an exemption you're not receiving, contact the Finance Department to ask about it. Some exemptions require you to file a form each year, while others are automatic once approved.

Paying by mail or in person

If you pay by mail, write your property account number on the check and send it to the address printed on your tax bill. The county's mail processing takes at least 10 business days, so the check must be postmarked well before the due date to arrive on time. "On time" means received and processed by the due date, not postmarked by the due date—so mailing a check the day before the deadline is risky.

In-person payments can be made at the Montgomery County Department of Finance office in Rockville during business hours. Bring your tax bill and a check or money order. The Finance Department does not accept cash. When you pay in person, you'll receive a receipt immediately, which is useful if you need proof of payment for your records.

Frequently Asked Questions

What if I don't receive my property tax bill?

Contact the Department of Finance and provide your property account number or address. The county can resend the bill or tell you the amount due and the due date. Don't assume you don't owe just because you didn't receive a bill—the county will still charge penalties and interest if payment is late.

Can I pay my property tax with a credit card?

The county's online portal accepts electronic bank transfers (ACH) and debit cards, but credit card payments typically trigger a convenience fee charged by a third-party processor. Check the portal when you're ready to pay to see the current fee and decide whether it's worth the cost.

What if I'm selling my house—who pays the property tax?

Property taxes are prorated at closing. You pay for the portion of the year you owned the house, and the buyer pays for the remainder. Your title company or attorney handles this calculation and adjustment at closing, so you don't pay the full year's tax if you sell mid-year.

Can I pay both installments at once?

Yes. You can pay the full year's tax in one payment if you want to. Some homeowners do this to simplify their budget or to take advantage of a lump-sum discount if one is available. Contact the Finance Department or check the online portal to confirm the total amount due for both installments.

What if I disagree with my property assessment?

You can file an assessment appeal with the county, but this is separate from paying your tax bill. You must still pay by the due date even if you've filed an appeal. If your appeal is successful and your assessment is lowered, the county will refund the overpayment or credit it to future bills.