Montgomery Maryland Property Tax Guide: Pay, Search, Due Dates & Exemptions
Montgomery County Maryland property tax is handled through more than one official office. The County’s Department of Finance/Treasury side handles bills, payments, receipts, interest, penalties and tax sale routing. Maryland SDAT handles real property assessments, ownership records, homestead status and assessment appeals.
Use this guide to search a bill, pay safely, understand September and December due dates, avoid card-fee surprises, check exemptions and credits, appeal an assessment, update address records, and know when to contact Montgomery County, SDAT or your mortgage escrow company.
Quick Answer: Where to Start
Use the Montgomery County real property tax payment system when you need to view or pay a county real estate tax bill. You can search by 8-digit bill number, 8-digit account number, or street address without the street suffix.
Use Maryland SDAT when the issue is the property assessment, taxable assessment, ownership record, mailing address, Homestead Tax Credit status, assessment worksheet, or assessment appeal.
Fast Route: Choose the Right Official Office
Many tax problems take longer because owners contact the wrong office first. Use this table before opening an official portal.
| Your Need | Start Here | Why | Next Step |
|---|---|---|---|
| Pay current property tax bill | Montgomery County payment system | The County accepts online, phone, mail and in-person payments. | Search by bill, account or address and confirm the property before paying. |
| Search tax bill or receipt | Montgomery County real property tax portal | The portal shows bill and payment information for County tax billing. | Use the exact 8-digit account/bill number or simplified street address. |
| Assessment value is too high | Maryland SDAT | SDAT assesses real property in Maryland and handles assessment appeals. | Review assessment notice and appeal within the allowed deadline. |
| Homestead status or assessment cap | Maryland SDAT / Montgomery County credit pages | Homestead eligibility is a state-administered credit that affects taxable assessment growth. | Check SDAT Real Property Search and Homestead application status. |
| Mortgage escrow paid or not paid | Mortgage servicer plus County tax bill portal | Escrow companies may pay, but owner should verify posting. | Check the bill after due dates and contact servicer if payment is missing. |
How to Pay Montgomery County Maryland Property Tax
Montgomery County accepts real property tax payments online, by phone, in person and by mail. Before paying, confirm the exact property, tax period, amount due, due date, and whether you are paying an annual bill or a semi-annual installment.
Do not rely only on a scheduled bank transfer screen. Montgomery County warns that taxes are not considered paid until the funds clear the County’s bank account.
| Payment Method | Official Detail | Best For | Watch Out For |
|---|---|---|---|
| Online | Pay through the County real property tax portal by electronic check, credit card or debit card. | Fast payment and confirmation when account details are correct. | Electronic check has no County portal fee; card payments have a service fee. |
| Phone | Call 240-777-8898 to pay by electronic check, credit card or debit card. | Owners who prefer assisted phone payment. | Phone card fee differs from online card fee. |
| In person | Pay at 27 Courthouse Square, Suite 200, Rockville, MD 20850. | Cash, check or in-person card payment. | Montgomery County states money orders are not accepted. |
| Mail check with payment slip to Montgomery County, MD, P.O. Box 5561, Binghamton, NY 13902-5561. | Check payments with the bill stub. | Postmark is not honored; payments are posted as received. |
- Open the official Montgomery County real property tax page.
- Search by 8-digit bill number, 8-digit account number, or street address without suffix.
- Confirm owner, address, tax period and amount due.
- Choose electronic check, card, phone, mail or in-person payment.
- Save confirmation and recheck posting after processing time.
How to Search a Montgomery County Property Tax Bill
The fastest search route is the official Montgomery County real property tax system. It lets users search by 8-digit bill number, 8-digit account number, or street address without suffix.
For address searches, keep it simple. Search “123 MAIN” instead of adding “Street,” “Road,” “Avenue,” unit punctuation or extra words. If the property still does not appear, use the account number from a prior bill, settlement document, mortgage escrow statement or SDAT record.
Best when you have the current tax bill in hand. Use the exact 8-digit number.
Best for repeat searches, receipts, escrow review and owner records.
Best when you do not know the account number. Remove suffixes like Road or Avenue.
New buyers can use the County estimated real property tax system for planning.
Montgomery County Maryland Property Tax Due Dates
Annual bills and the first installment of semi-annual bills are due on or before September 30. The second semi-annual installment is due December 31.
Supplemental and revised tax bills can have different due dates, often based on the date the bill is issued. Always read the bill itself when it is not the regular annual bill.
| Bill Type | Usual Due Date | Delinquency Timing | Owner Action |
|---|---|---|---|
| Annual real property tax bill | September 30 | Becomes delinquent October 1 if unpaid. | Pay early enough for funds to clear and post. |
| Semi-annual first installment | September 30 | Becomes delinquent October 1 if unpaid. | Verify escrow or pay directly before the deadline. |
| Semi-annual second installment | December 31 | Becomes delinquent January 1 if unpaid. | Do not wait for the holiday week if using bank bill pay or mail. |
| Supplemental or revised bill | Usually due based on the bill issue date. | Read the specific due date printed on the bill. | Treat it separately from the annual/semi-annual schedule. |
Important payment timing: Montgomery County says it does not honor postmark dates. Payments are posted as received, and processing for cards, e-checks, wire transfer or bill pay may extend into early October or early January for payments near the due dates.
Payment Fees, Posting and Common Payment Problems
Electronic check is usually the lowest-cost route through the official County system because the County payment page lists no fee for e-check. Credit and debit card payments carry third-party service fees that are not collected by Montgomery County and are not refundable.
After payment, allow time for posting. Montgomery County says a recent payment may take up to 72 hours to update, and if it is not applied after 10 days, you may contact MC311 and place a service request.
| Payment Detail | What the County Says | Best Practice |
|---|---|---|
| Online e-check | No fee. | Check routing/account details before submitting. |
| Online card | Credit/debit card fee is listed on the official portal. | Compare card fee against e-check before paying. |
| Phone card payment | Phone card fee is different from online/in-person card fee. | Ask or review the fee before authorizing payment. |
| Mail payment | Mail checks with payment slip to the official Binghamton P.O. Box. | Mail early because postmark is not honored. |
| Recent payment not showing | Check with your financial institution; balance update may take up to 72 hours. | After 10 days, contact MC311 if still not applied. |
Assessment vs Tax Bill: Why SDAT Matters
Maryland SDAT assesses real property and maintains the statewide real property database. Montgomery County uses assessment and tax rate information to calculate the tax bill, but the County does not decide your SDAT market value.
This means a high bill can come from a higher assessment, a tax rate, special area charges, non-tax charges, a missing credit, or a payment/escrow issue. Identify which part changed before you appeal, pay, or call.
| Item | Handled By | What It Means | Where to Check |
|---|---|---|---|
| Market value / assessment notice | Maryland SDAT | The state assessment used in the tax calculation. | SDAT Real Property Search or assessment notice. |
| Tax rates | County and applicable jurisdictions | Rates applied to taxable assessment based on location and class. | Montgomery County tax rates page. |
| Tax bill and receipt | Montgomery County Department of Finance | The bill, payments, posting and balance due. | County real property tax portal. |
| Homestead credit status | Maryland SDAT | Whether taxable assessment growth may be capped for principal residence. | SDAT Real Property Search and Homestead page. |
How to Appeal a Montgomery County Maryland Property Assessment
Assessment appeals start with Maryland SDAT, not the Montgomery County payment portal. If you received an assessment notice and believe the total new market value does not reflect market value, SDAT’s online form can be used to appeal within 45 days of the notice date.
If you purchase a property transferred after January 1 but before July 1, SDAT says a new owner appeal may be filed within 60 days after the transfer. A petition for review may also be available during the three-year assessment cycle.
- Read the SDAT assessment notice and note the notice date.
- File within 45 days if appealing the assessment notice.
- For a new owner appeal, check whether the transfer timing qualifies.
- Gather comparable sales, condition evidence, photos, closing documents and property facts.
- Use SDAT’s online appeal form or the correct petition/review form.
| Appeal Stage | Plain-English Meaning | What to Prepare |
|---|---|---|
| Supervisor level | First SDAT assessment appeal step. | Assessment notice, worksheet, comparable sales and property facts. |
| PTAAB | Property Tax Assessment Appeal Board review after SDAT decision. | Prior decision, evidence packet and reason you disagree. |
| Maryland Tax Court | Further appeal route after PTAAB. | Deadlines, records, legal strategy and professional guidance if needed. |
Evidence Checklist for an Assessment Appeal
Do not appeal with only “my tax bill is too high.” Assessment appeals are stronger when they focus on value, classification, property facts, condition, comparable sales or assessment errors.
Organize evidence before the hearing or review. Put the strongest documents first and connect each item to the value or correction you are requesting.
| Evidence | Best For | How to Use It |
|---|---|---|
| Comparable sales | Showing market value is lower than assessed value. | Use nearby, similar, recent sales and explain differences. |
| Closing statement | New buyer appeal or recent purchase evidence. | Show arm’s-length purchase price and date. |
| Condition photos | Damage, deferred maintenance, structural issues or outdated features. | Date photos and connect each issue to value. |
| Repair estimates | Costly defects that affect value. | Use contractor estimates, inspection reports and paid receipts. |
| Survey or floor plan | Wrong land size, living area, lot shape or building facts. | Mark the exact SDAT record error. |
| Assessment worksheet | Understanding how the state described and valued the property. | Request or review it before arguing the value. |
Montgomery Maryland Property Tax Exemptions and Credits
Property tax relief can come from different programs. Some are state-administered through SDAT, some are Montgomery County credits, and some depend on age, disability, veteran status, income, principal residence, ownership history or other facts.
Always check the current year rules before relying on last year’s bill. Credits can change, and eligibility can be lost if a property is no longer the owner’s principal residence.
| Credit or Exemption | What It Helps With | Where to Start |
|---|---|---|
| Maryland Homestead Tax Credit | Limits taxable assessment increases for an eligible principal residence. | SDAT Homestead Tax Credit page and SDAT Real Property Search. |
| State Homeowners’ Property Tax Credit | Income-based credit when property taxes exceed a fixed percentage of income. | Maryland SDAT Homeowners’ Property Tax Credit application. |
| Montgomery County Supplemental Homeowners Credit | County supplement connected to state homeowners credit rules. | Montgomery County tax credit information and SDAT application process. |
| Senior Property Tax Credit | County senior relief for eligible homeowners age 65 or older. | Montgomery County Senior Property Tax Credit page. |
| Individuals 65+ and retired military credit | County property tax credit for certain older owners or retired military service members. | Montgomery County individual tax credit page. |
| Disabled veteran property tax credit | County property tax credit for qualified disabled veterans or qualifying surviving spouses. | Montgomery County disabled veteran credit page. |
Homestead Tax Credit and Assessment Cap: What to Check
The Homestead Tax Credit is not the same as a payment discount. It is designed to limit taxable assessment increases on an eligible principal residence.
Montgomery County explains that Maryland counties and municipalities must limit taxable assessment increases to no more than 10% per year, and Montgomery County uses a 10% limit for principal residential properties, except the Town of Kensington, which has a 5% limit.
- Open Maryland SDAT Real Property Search.
- Search your Montgomery County property.
- Review the Homestead application status area on the property record.
- File the one-time Homestead eligibility application if required.
- Check your County bill to see whether credits appear correctly.
Owner-occupied warning: Homestead and related credits are tied to principal residence rules. Renting out a former home, moving, title changes, estate issues or multiple-home ownership can affect eligibility.
Mortgage Escrow, New Buyers and Settlement Checks
A mortgage escrow account does not remove the owner’s need to monitor the tax bill. Lenders and servicers may pay taxes, but the property owner should still verify that the correct bill was paid on time.
New buyers should also check the first full fiscal year estimate, tax proration at settlement, Homestead status, mailing address, escrow setup and whether the previous owner had credits that will not apply to the new owner.
Search the County tax bill and SDAT record. Confirm owner name, mailing address and account number.
Ask the mortgage servicer which installment it will pay and when the payment will be sent.
SDAT is the official custodian of real property mailing addresses in Maryland, so address problems may need SDAT correction.
Do not assume prior-owner credits, exemptions or escrow amounts will continue for the new owner.
Late Payments, Penalty, Interest and Tax Sale Risk
Annual bills and the first semi-annual installment become delinquent October 1 if unpaid. The second semi-annual installment becomes delinquent January 1 if unpaid.
Montgomery County states delinquent bills are subject to monthly interest and penalty, and delinquent real property taxes can become a lien. If unpaid, the lien may be sold through the County’s tax sale process in the subsequent calendar year.
| Problem | What It Means | What to Do |
|---|---|---|
| Payment missed September 30 | Annual or first installment may become delinquent October 1. | Pay immediately and verify posted balance. |
| Payment missed December 31 | Second installment may become delinquent January 1. | Check interest/penalty and pay through official route. |
| Bill unpaid into next year | Unpaid taxes may be subject to tax lien sale process. | Contact County Finance/MC311 before tax sale advertising escalates. |
| Trying to sell or refinance | Delinquent taxes and liens can block or complicate transfer. | Pay and obtain proof before settlement deadlines. |
Common Montgomery Maryland Property Tax Mistakes to Avoid
Most problems come from mixing up assessment, billing, payment and credit issues. Use the correct office and keep proof for every action.
Montgomery County does not honor postmark dates. The payment must be received and processed.
The County payment portal cannot lower SDAT’s assessment value. Assessment appeals start with SDAT.
Credit and debit card fees are not County revenue and are not refundable.
Mortgage companies can make errors. Verify the bill is paid and posted.
Assessment notice appeals usually must be filed within 45 days of the notice date.
Principal residence, senior, veteran, income and ownership facts can change eligibility.
Montgomery County Tax Office Visit and Mailing Details
Use in-person service when you need help with a payment issue, bill question, receipt, account problem, or document that cannot be handled online.
| Route | Official Detail | What to Bring |
|---|---|---|
| In person | 27 Courthouse Square, Suite 200, Rockville, MD 20850. | Bill, account number, ID, payment method, proof of prior payment. |
| Phone payment | 240-777-8898. | Bill/account number, payment details and confirmation note. |
| General MC311 | Call 311 in Montgomery County or 240-777-0311 from outside the County. | Account number, address, issue summary and payment proof. |
| Mail payment | Montgomery County, MD, P.O. Box 5561, Binghamton, NY 13902-5561. | Check and payment slip from the bottom of the tax bill. |
Documents to Keep for Your Property Tax File
Keep a simple digital folder for every tax year. This makes appeals, escrow disputes, credits, refinancing and future sales easier.
| Document | Why It Matters | Keep Until |
|---|---|---|
| Annual tax bill | Shows taxes, non-tax charges, credits, due dates and account details. | At least until the next full billing cycle and any dispute is closed. |
| Payment confirmation | Shows when and how payment was submitted. | Until bill shows paid and escrow/account records match. |
| Assessment notice | Starts appeal timing and shows new market value. | Through appeal window and reassessment cycle. |
| Credit applications | Supports Homestead, homeowners, senior, veteran or local credit status. | As long as credit remains active plus any review period. |
| Closing statement | Helps new owners verify escrow, tax prorations and assessment evidence. | Permanent homeownership record. |
Related Property Tax Guides on This Site
These guides help explain the broader property tax process before you use the official Montgomery County or Maryland SDAT systems.
Official Montgomery County and Maryland Property Tax Links
Use these official links when you are ready to complete an account-specific action, pay, search, apply for a credit, appeal an assessment, verify a bill, or contact the correct office.
Montgomery Maryland Property Tax FAQs
Where do I pay Montgomery County Maryland property tax?
Use the official Montgomery County real property tax payment system. It supports online payment, bill search, phone payment instructions, mail payment details and in-person payment information.
How do I search a Montgomery County property tax bill?
Search the County real property tax portal by 8-digit bill number, 8-digit account number, or street address without the street suffix.
What are the Montgomery County Maryland property tax due dates?
Annual bills and first semi-annual installments are usually due September 30. Second semi-annual installments are due December 31. Supplemental or revised bills may have different due dates printed on the bill.
Does Montgomery County honor postmark dates?
No. Montgomery County states that postmark dates are not honored and payments are posted as received. Mail early or use electronic payment before the deadline.
What payment method has no fee?
The County payment page lists electronic check as no fee. Credit and debit card payments include third-party service fees that are not collected by Montgomery County and are not refundable.
What is the phone number to pay Montgomery County property tax?
The County payment page lists 240-777-8898 for phone payment. Have the bill or account number ready before calling.
Where do I mail Montgomery County property tax payments?
Mail checks with the payment slip to Montgomery County, MD, P.O. Box 5561, Binghamton, NY 13902-5561. Do not mail without enough time for receipt and posting.
Where is the Montgomery County tax office for in-person payment?
The official payment page lists 27 Courthouse Square, Suite 200, Rockville, MD 20850 for in-person payments.
Who handles Montgomery County property assessments?
Maryland SDAT handles real property assessments and assessment records. Montgomery County uses those values for billing but does not decide the SDAT assessment value.
How long do I have to appeal a Maryland assessment notice?
SDAT says assessment appeals must generally be filed within 45 days of the notice date. New owner appeals may have a 60-day rule when the transfer timing qualifies.
What evidence helps an assessment appeal?
Comparable sales, closing statements, photos, repair estimates, surveys, property worksheets, building facts and condition evidence can help when they support a specific lower value or correction.
What is the Maryland Homestead Tax Credit?
The Homestead Tax Credit limits taxable assessment increases for eligible principal residences. Check SDAT Real Property Search and the Homestead application page for status.
What is the State Homeowners’ Property Tax Credit?
It is an income-based Maryland credit that may reduce property tax when property taxes exceed a fixed percentage of household income. It is administered through SDAT.
Does Montgomery County have a senior property tax credit?
Yes. Montgomery County lists a Senior Property Tax Credit for qualifying homeowners at least 65 years of age whose property is their principal residence and who meet program rules.
Does Montgomery County have a disabled veteran property tax credit?
Yes. Montgomery County lists a disabled veteran property tax credit for qualifying disabled veterans or qualifying surviving spouses, subject to program limits and exclusions.
What if my mortgage company pays my taxes?
Still verify the bill after the due date. Escrow companies can make timing or account errors, and the owner should confirm the payment posted correctly.
What if my payment does not show?
Montgomery County says recent payments may take up to 72 hours to update. If a payment has not applied after 10 days, contact MC311 and place a service request.
What happens if Montgomery County property taxes are delinquent?
Delinquent taxes can be subject to interest, penalty and tax lien sale procedures. Contact the County before the issue escalates into tax sale status.
Can I lower my tax bill by appealing the payment portal?
No. The payment portal cannot lower an assessment. If the assessment value is wrong, use Maryland SDAT’s assessment appeal process.
Is CountyPropertyTaxes.us an official Montgomery County site?
No. This is an independent informational guide. Use official Montgomery County and Maryland SDAT pages for final account-specific actions.
Bottom Line
For Montgomery Maryland property tax, use the County portal for bills, payments, receipts and due dates. Use Maryland SDAT for assessments, Homestead status, ownership records and assessment appeals. Keep payment deadlines separate from assessment appeal deadlines.
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