Montgomery MD Property Tax: Look Up Your Bill, Pay Safely, Check Credits & Avoid Tax Lien Sale
Use this Montgomery County Maryland property tax guide when you need to search a real property tax bill, pay online by free e-check, understand the September 30 and December 31 deadlines, check SDAT assessment and Homestead status, verify the $692 county credit, handle escrow problems, apply for homeowner or senior credits, appeal value, or resolve tax-sale risk before extra costs grow.
Start here: choose the right Montgomery County property tax task
Most Montgomery County property-tax problems are solved faster when you separate payment, SDAT assessment, Homestead status, tax credit, escrow, and tax-sale questions.
Fast task board
- 1Need the amount due? Use Montgomery County’s Real Property Tax portal and search the bill before paying.
- 2Need to pay with the lowest electronic fee? Use electronic check through the county website or phone system. The county says e-check is free; card payments have a processor fee.
- 3Need assessment value or mailing-address correction? Use Maryland SDAT. SDAT is the official custodian of assessment and mailing-address information.
- 4Need Homestead or ITOC? Check SDAT Homestead Application Status. The county says the $692 ITOC requires a Homestead application on file with SDAT.
- 5Bill is delinquent? Act before tax-lien sale costs, advertising fees, redemption interest and certificate-holder costs are added.
Official live-task links
Look up bill
Confirm tax account, owner, address, bill year and balance.
Check SDAT
Verify assessment, mailing address and Homestead status.
Pay by deadline
County does not honor postmark dates; payment must be received.
Fix credits or risk
Apply for credits or resolve delinquency before tax-lien sale.
How to look up a Montgomery County MD property tax bill
Use the county portal for live tax bill and payment information. Use SDAT for assessment value, mailing address, account identifier and Homestead application status.
1
Open the official Montgomery County tax portal
Use this before entering payment details anywhere else.
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Open Montgomery County Maryland Real Property Tax. Read the payment warning first: the county says taxes are not considered paid until the funds clear the county’s bank account.
2
Search and verify the correct property
Do not pay only because an address looks similar.
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Verify owner, property address, account number, levy year, credits, annual/semiannual coupons, interest/penalty and total due. If the balance changed recently, allow up to 72 hours for updates after bank processing.
3
Use SDAT when assessment or address looks wrong
The county bill depends on SDAT data.
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Open SDAT Real Property Search, select Montgomery County, and search by address or account identifier. Check current assessment, owner mailing address, account identifier and Homestead Application Status.
| Lookup Need | Use This | Important Tip |
|---|---|---|
| Tax balance / payment | Montgomery County real property tax portal | Use the county portal for actual amount due and payment status. |
| Assessment value | Maryland SDAT Real Property Search | SDAT reassesses properties every three years and certifies values to the county. |
| Homestead status | SDAT property record | Scroll to “Homestead Application Status” near the bottom of the SDAT record. |
| Wrong mailing address | SDAT | Montgomery County says SDAT is official custodian of mailing addresses. |
| Escrow question | County portal + lender | County says disputes from lender late/non-payment must be resolved with the lender. |
How to pay Montgomery County MD property taxes safely
Montgomery County offers online, phone, mail and in-person payment. The safest route near a deadline is one that gives clear receipt and assured delivery before the due date.
Online e-check
Use the official real property tax portal. Montgomery County says electronic check through the website is free of charge.
Phone payment
Call 240-777-8898 to pay by electronic check, debit card or credit card. E-check by phone is also listed as free.
Mail check payable to Montgomery County, Maryland with coupon to P.O. Box 824845, Philadelphia, PA 19182-4845. Money orders are not accepted.
In person
Pay at Division of Treasury, 27 Courthouse Square, Suite 200, Rockville, MD 20850. Accepted options include cash, check, debit card or credit card.
| Payment Type | Official Fee / Rule | Best Use |
|---|---|---|
| Electronic check online | Free through county website | Lowest-cost electronic payment. |
| Electronic check by phone | Free by phone service | When you prefer phone payment but want to avoid card fee. |
| Credit / debit card | Approximately 2.3% processor fee; non-refundable if a refund is requested | When card convenience is worth the fee. |
| Postmark not honored; must be received by due date | Only when mailed well before deadline. | |
| Online banking bill pay | County recommends scheduling at least 5 business days ahead | Only if there is enough time for delivery. |
1
Start from the official county payment portal
Avoid third-party pages unless reached from the county site.
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Use Montgomery County Real Property Tax Payment Portal. Read the county warning, agree only after confirming you are on the county portal, then search and pay.
2
Choose e-check when cost matters
Card fee can be expensive on a large tax bill.
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Electronic check is usually the best official online option because the county says e-check through website and telephone service is free. Confirm routing/account information carefully because the payer is responsible for correct entry.
3
Do not rely on postmark near deadline
This is a major Montgomery County trap.
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Montgomery County says it does not honor postmark dates. If the due date is close, use e-check or in-person payment instead of mailing a check that may arrive after the deadline.
Montgomery County MD property tax due dates, semiannual payment and penalties
Annual bills and first semiannual installments are due by September 30. Second semiannual installments are due by December 31. Due means received, not postmarked.
| Date / Bill Type | What Happens | Action for Property Owner |
|---|---|---|
| July 1 tax year start | Real property taxes, refuse charges, WSSC charges and other applicable fees are due and payable without interest/penalty. | Check the county portal and your mailed bill. |
| September 30 | Annual bills and first semiannual installments must be received by this date. | Pay in full or pay first semiannual installment before delinquency. |
| October 1 | Annual accounts and first semiannual installments become delinquent. | Interest/penalty begins if unpaid. |
| December 31 | Second semiannual installment must be received by this date. | Pay before year-end if using semiannual plan. |
| January 1 | Second semiannual installment becomes delinquent. | Pay quickly to reduce monthly interest/penalty. |
| Supplemental levy | Partial-year levy for new construction or additions is due 30 days after billing. | Do not assume lender will pay supplemental levy. |
Late penalty
Delinquent taxes are subject to 1⅔% per month interest and penalty until paid in full.
Semiannual billing
Principal residential properties are paid semiannually unless the taxpayer chooses to pay both installments by September 30.
Escrow annual election
Escrow taxpayers may elect annual payment, but the county says they must notify their lender by May 1.
Postmark not accepted
Mailing a check by the deadline is not enough. Montgomery County posts payments as received.
How Montgomery County property assessments work through SDAT
Montgomery County does not create your assessment value. Maryland SDAT assesses property every three years and certifies values to the county for billing.
Assessment source
SDAT controls assessment value, property classification, owner mailing address and Homestead application status.
Tax-rate source
The County Council sets the real property tax rate. Municipal taxes, special districts and fees may appear depending on location and property type.
Tax bill source
Montgomery County Department of Finance/Treasury applies rates, credits and fees to SDAT-certified values and bills the tax.
New buyer warning
Homestead credit does not apply the first year after purchase, so the buyer’s taxable assessment may be higher than the prior owner’s.
1
Open SDAT Real Property Search
Use this for value, owner and address data.
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Open SDAT Real Property Search. Select Montgomery County, then search by address or account identifier.
2
Check the record fields that affect your bill
Do not only look at market value.
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Review assessment, taxable value, mailing address, principal residence indicators, property use, Homestead Application Status and assessment notice information. A wrong mailing address can cause missed bills, but it does not remove the obligation to pay.
3
Appeal through SDAT when value is wrong
The payment office cannot lower assessment value.
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If the assessment is wrong, use SDAT appeal instructions from your assessment notice or contact the Montgomery County assessment office at 240-314-4510. Use sales comparisons, condition evidence, incorrect property data or market evidence.
Montgomery County property tax credits: Homestead, ITOC, Homeowners and Senior Credit
Credits are where many Montgomery homeowners lose money. Check SDAT Homestead status and homeowner credit eligibility before assuming the bill is correct.
Homestead Tax Credit
For principal residences, the State, Montgomery County and municipalities generally limit taxable assessment increases to 10% per year; Kensington uses a 5% local limit.
County ITOC
The county says the Income Tax Offset Credit appears as “County Property Tax Credit” and has been $692 for eligible owner-occupied properties.
Homeowners’ Property Tax Credit
Maryland HOTC and Montgomery County supplemental credit are administered by SDAT and are based on household income compared with the property tax bill.
Senior Property Tax Credit
Available to homeowners at least 65 whose property is their principal residence and who qualify for the State Homeowners’ Tax Credit or County Supplement.
65+ / retired military credit
County credit may apply to owners 65+ who meet long-term ownership/residence rules or retired military/surviving-spouse rules. Application deadline is April 1.
Fire sprinkler credit
Montgomery County offers a one-time real property tax credit for certain approved fire sprinkler system installations.
1
Check Homestead status on SDAT first
Do not assume your application is already on file.
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Open SDAT Real Property Search, select Montgomery County, open your property record, then scroll to Homestead Application Status. If it says Approved or Application Received, you generally do not need to apply again. If it says No Application, file with SDAT.
2
Apply for Homestead if status says No Application
This affects future credit eligibility.
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Use Maryland OneStop Homestead Tax Credit Eligibility Application. You will need the district and real property account number from your SDAT property record.
3
Apply for Homeowners’ credit if income may qualify
This is different from Homestead.
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Use the SDAT Homeowners’ Property Tax Credit Program or call 1-800-944-7403. Montgomery County says applications must be filed by October 1, and taxpayers 70+ may file three years retroactively.
Common Montgomery County property tax problems buyers and escrow customers should check
Many bill problems are caused by first-year buyer treatment, lender timing, supplemental levies, incorrect SDAT mailing address or online banking delays.
| Situation | What Montgomery County Says / Implies | Best Next Step |
|---|---|---|
| New buyer | Homestead credit is not applicable the first year after purchase. | Estimate taxes without prior owner’s Homestead credit. |
| Seller disclosure | County requires residential sellers to estimate and disclose next levy-year property tax to buyers. | Ask for the estimated tax disclosure before closing. |
| Escrow should pay | Owner still receives original bill and remains responsible for timely payment. | Check portal before September 30 and December 31; contact lender if unpaid. |
| Supplemental levy | Lenders do not pay supplemental levies for newly constructed properties and additions. | Pay supplemental bill yourself unless lender confirms otherwise. |
| Wrong mailing address | SDAT is official custodian of addresses; failure to change address does not remove tax obligation. | Update SDAT, then verify future county bills. |
| Online banking | County recommends scheduling online banking payments at least five business days before due date. | Use county e-check for assured delivery when close to due date. |
Montgomery County tax lien sale: what delinquent owners should know
Montgomery County tax sale is a lien sale process, not a simple online payment issue. Delinquent taxes, fees and charges can be advertised and sold if unresolved.
Overdue and in arrears
Taxes become overdue October 1 for annual accounts and first semiannual installments; second semiannual installments become overdue January 1.
Monthly interest/penalty
Delinquent balances accrue 1⅔% per month or fraction of a month until paid in full.
Advertising
Eligible accounts are listed for four consecutive weeks in a Montgomery County newspaper and may be subject to an advertising fee.
Annual sale
Montgomery County conducts its public sealed-bid tax sale annually, generally on the second Monday in June. Verify the current year’s sale notice before relying on dates.
1
Check the live tax portal first
Old notices may not include all current costs.
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Open the Real Property Tax Payment Portal and verify whether delinquent tax, interest, penalty, fees or other charges remain unpaid.
2
Pay all amounts, not just original tax
A remaining interest balance can still create sale risk.
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Montgomery County warns that a tax lien sale can occur even if the original tax amount was paid but interest and penalty remain unpaid. Confirm payoff includes interest, penalty, advertising, service charges or other county-listed fees.
3
Use official tax sale instructions if advertised
Tax sale rules are complex and date-sensitive.
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Read Montgomery County Tax Sale Information and Procedures and Tax Sale Notice. If you are an owner trying to avoid sale, contact Treasury/MC311 and ask for exact payoff and accepted payment route.
| Tax Sale Issue | What to Check | Owner Action |
|---|---|---|
| Annual/first installment unpaid | Delinquent after October 1 | Pay before interest/penalty and sale costs grow. |
| Second installment unpaid | Delinquent after January 1 | Resolve before sale-advertising season. |
| Interest/penalty remains | Tax portal total due | Pay remaining balance; original tax payment alone may not remove lien risk. |
| Advertised account | County tax sale notice and newspaper listing | Contact Treasury for payoff before sale deadline. |
| After sale | Redemption amount and certificate-holder costs | Get legal/payment guidance quickly; redemption costs can grow. |
How to estimate a Montgomery County MD property tax bill
A rough estimate starts with SDAT taxable assessment, then applies county, state, municipal and special district charges, then subtracts credits.
| Step | What to Use | Why It Matters |
|---|---|---|
| 1. SDAT assessment | SDAT Real Property Search | County bills are based on SDAT-certified assessment data. |
| 2. Tax rate | Montgomery County tax rate schedule | County Council sets rate; municipalities and districts can add charges. |
| 3. Credits | Homestead, ITOC, HOTC, Senior Credit | Credits can significantly reduce the bill. |
| 4. Fees and charges | Actual tax bill | Solid waste, WSSC, water quality, TDM, Bay Restoration or other charges may apply. |
| 5. Final balance | County tax payment portal | Portal balance controls payment status and remaining due. |
Montgomery County MD property tax contacts
Use Treasury for tax bills and payments. Use SDAT for assessment value and mailing address. Use MC311 when you need county routing or service request help.
Treasury Division
Address: 27 Courthouse Square, Suite 200, Rockville, MD 20850
Use for: tax bills, payments, receipts, in-person cashier help.
Phone / payment
Property Tax Section: 240-777-0311
Automated payment: 240-777-8898
MC311: 311 or 240-777-0311 from outside county.
SDAT assessment
Montgomery assessment office: 240-314-4510
Homestead help: 410-767-2165 or 1-866-650-8783
Email: sdat.homestead@maryland.gov
Map to Montgomery County Treasury Division
Use this map for in-person Treasury payment at 27 Courthouse Square, Suite 200, Rockville, MD 20850. MC311 guidance lists public access from 8:00 a.m. to 4:30 p.m., Monday through Friday, and drop boxes inside the Treasury office when open to the public.
Official Montgomery County and Maryland property tax resources
Use these for live actions. The key official-source details are already summarized above so users only leave to search, pay, apply, appeal or verify current status.
Montgomery MD property tax FAQs
Short answers for homeowners, new buyers, escrow customers, credit applicants and owners trying to avoid delinquency or tax-lien sale.
QHow do I pay Montgomery County MD property tax online?▾
Use the official Montgomery County Real Property Tax portal. Search your account, verify the property and bill year, choose payment method, review fees and save confirmation.
QWhen are Montgomery County property taxes due?▾
Annual bills and first semiannual installments must be received by September 30 and become delinquent October 1. Second semiannual installments must be received by December 31 and become delinquent January 1.
QDoes Montgomery County accept postmark dates?▾
No. Montgomery County says it does not honor postmark dates and posts payments as received. Mail early or use the county e-check option when close to deadline.
QWhat is the late penalty?▾
Delinquent taxes are subject to interest and penalty at 1⅔% per month until paid in full, calculated on the net amount after credits.
QCan I pay semiannually?▾
Principal residential properties are generally paid on a semiannual schedule unless the taxpayer chooses to pay both installments by September 30. Escrow taxpayers who want annual payment must notify the lender by May 1.
QWho determines my assessment value?▾
Maryland SDAT assesses property every three years and certifies assessment values to Montgomery County. Use SDAT for value, mailing-address and Homestead status questions.
QHow do I check Homestead status?▾
Search your property on SDAT Real Property Search, then scroll to Homestead Application Status. Approved or Application Received generally means you do not need to apply again; No Application means you should apply through SDAT/Maryland OneStop.
QWhat is the $692 county credit?▾
Montgomery County says the Income Tax Offset Credit appears on tax bills as “County Property Tax Credit” and has been $692 for each eligible owner-occupied property. A Homestead application must be on file with SDAT to qualify.
QWhere is the Treasury office?▾
Montgomery County Treasury Division is at 27 Courthouse Square, Suite 200, Rockville, MD 20850. MC311 guidance lists public access from 8:00 a.m. to 4:30 p.m., Monday through Friday.
QIs PropertyTaxUSA.org official?▾
No. PropertyTaxUSA.org is an independent informational guide. Always verify tax bills, payment status, credits, assessment values, penalties, deadlines and tax sale information with official Montgomery County and Maryland SDAT resources.
Bottom line
For Montgomery MD property tax, think: search the county tax portal → check SDAT assessment and Homestead status → pay by September 30 or December 31 → use e-check to avoid card fees → resolve delinquency before tax-lien sale costs grow. Use Treasury for bills and payments, SDAT for values and mailing address, and MC311 for county routing or service requests.
Independent guide notice: This page is not Montgomery County Government, Maryland SDAT, a payment processor, tax collector, legal office or financial adviser. Official county and state sources control tax bills, payment status, assessment records, credits, deadlines, accepted payment methods and tax-sale rules.