If your Montgomery County property tax increase caught you off guard, it happened for one of three reasons: the state raised your assessed value, the county raised the combined tax rate, or both. For the 2025–2026 tax year, the base county real property tax rate is $0.6742 per $100 of assessed value, and special area taxes for fire, transit, parks, and other services push the total effective rate well above that base.1Maryland Department of Assessments and Taxation. 2025-2026 Tax Rates and Homestead Credit Caps Maryland softens the impact by phasing assessment increases in over three years, and several credit programs can shrink what you owe. To use any of that, you need to understand what changed and act on tight deadlines.
Why Your Assessment Went Up
The Maryland State Department of Assessments and Taxation (SDAT) reappraises every property in the state once every three years.2Maryland Department of Assessments and Taxation. Real Property Montgomery County is split into three geographic groups, and one group is reassessed each year on a rotating basis. Area 2 properties, for example, were reassessed effective January 1, 2026, and won’t be reassessed again until January 1, 2029.3Maryland State Department of Assessments and Taxation. Montgomery County Reassessment Areas
Assessors set market value by analyzing recent sales of comparable nearby homes, reviewing exterior conditions, and accounting for improvements or deterioration. The figure represents what your property would likely sell for on the open market as of January 1 of the reassessment year. You’ll receive a Notice of Assessment, typically mailed in the final days of December, showing both the old value and the new market value.
Read this notice carefully before doing anything else. Errors in square footage, lot size, or the number of bedrooms and bathrooms happen more often than you’d expect, and each error inflates your tax bill. Wrong data on the notice is your strongest basis for a correction or appeal.
The Three-Year Phase-In
Maryland law prevents the full impact of a higher assessment from hitting your bill at once. Any increase in market value is divided into three equal annual installments. If SDAT raises your home’s value by $60,000, only $20,000 is added to your taxable base in the first year, another $20,000 in the second, and the final $20,000 in the third.4Maryland Department of Assessments and Taxation. A Homeowner’s Guide to Property Taxes and Assessments Your bill rises gradually over the cycle rather than spiking in a single year.5Maryland Department of Assessments and Taxation. Questions and Answers About Real Property Assessments
The phase-in only applies to increases. If your property’s value drops, the lower assessment takes effect immediately, and your bill should decrease in the next tax year with no three-year delay.
Your Full Tax Rate Is More Than the Base Rate
Your bill isn’t just the base county rate multiplied by your assessment. Montgomery County layers on up to ten special area taxes that fund specific services: fire protection, public transit, the Maryland-National Capital Park and Planning Commission, recreation, storm drainage, urban districts, parking, noise abatement, metropolitan services, and advanced land acquisition.6Montgomery County, Maryland. Definition of Special Area Taxes Which ones apply depends on where in the county you live.
To calculate what you owe, take your phased-in taxable assessment, divide by 100, and multiply by the combined tax rate for your property. If your taxable assessment is $500,000 and your combined rate is $1.04 per $100, your annual bill would be $5,200. When the county council raises any of the individual special area rates, the combined rate rises even if the base county rate holds steady.
Credits That Can Lower What You Owe
Several programs reduce either the taxable portion of your assessment or the tax itself. Missing the application deadlines is one of the most expensive mistakes homeowners make.
Homestead Tax Credit
The Homestead Tax Credit caps how much your taxable assessment can increase in a single year. Maryland law sets the default cap at 10%, so even if your market value jumps 25% in a reassessment, your taxable assessment can only grow by 10% annually for purposes of calculating the credit.7Maryland General Assembly. Maryland Code Tax – Property 9-105 – Homestead Property Tax Credit Montgomery County uses the 10% limit.
The property must be your principal residence, and you must submit a one-time application with SDAT. If you bought your home and never filed the application, you’re paying more than you need to. Check your status on the SDAT website; there’s no retroactive credit for years you missed.8Maryland Department of Assessments and Taxation. Maryland Homestead Property Tax Credit Program
Senior Tax Credit
Montgomery County offers a 20% credit on county property taxes for homeowners who are at least 65 and have lived in their home for at least 40 consecutive years. The property’s assessment must be $700,000 or less at the time of application. You apply once, but applications must be submitted on or before April 1 to receive the credit for the fiscal year starting July 1.9Montgomery County, Maryland. Property Tax Credit for Elderly Individuals and for Military Retirees Military retirees may also qualify under the same program.
Disabled Veteran Exemption
Veterans with a permanent, service-connected disability rated 100% by the VA can receive a full exemption from real property taxes on the home where they live and the surrounding yard. Certain unremarried surviving spouses of disabled veterans and surviving spouses of military personnel killed in the line of duty may also qualify.10Montgomery County, Maryland. Disabled Veteran’s Property Tax Exemption
How to Appeal Your Assessment
If you believe SDAT overvalued your property, an appeal is your primary tool for reducing future bills. The process is straightforward. The deadlines are unforgiving.
The 45-Day Deadline
You must submit a written appeal within 45 days of the date on your assessment notice.11Maryland General Assembly. Maryland Code Tax – Property 14-502 – Appeals to Supervisor File online through the SDAT portal using the control number on your notice, or mail the paper appeal form included with the notice to your local assessment office.12Maryland Department of Assessments and Taxation. Assessment Appeal Process If you recently purchased the property after January 1, you get 60 days from the transfer date instead.
Miss the 45-day window and your appeal is dead. The Property Tax Assessment Appeal Board (PTAAB) can waive the deadline on a showing of good cause based on physical inability to meet it, but that’s a narrow exception you don’t want to rely on.13Maryland General Assembly. Maryland Code Tax – Property 14-509 – Appeals to Property Tax Assessment Appeal Board
Evidence That Actually Works
General dissatisfaction with your bill won’t get your assessment reduced. You need specific evidence that SDAT’s valuation is higher than market reality supports.
- Recent sales of similar nearby homes that closed for less than your assessed value. Focus on properties with comparable square footage, lot size, age, and condition in the same neighborhood.
- Factual errors on the notice, like overstated square footage, a wrong bedroom count, or an improvement that doesn’t exist. These are the easiest wins.
- Photographs documenting structural damage, deferred maintenance, or other conditions that pull market value below what comparable sales suggest.
- An independent appraisal from a licensed appraiser following the Uniform Standards of Professional Appraisal Practice (USPAP). It costs money upfront but can pay for itself many times over if the assessed value drops substantially.
Levels of Review
The first level is the Supervisor’s Review at SDAT, where a hearing is held to examine your evidence, by phone or in person. You’ll receive a written decision.12Maryland Department of Assessments and Taxation. Assessment Appeal Process If you disagree with the supervisor’s decision, you can appeal to PTAAB within 30 days of the final notice. Beyond PTAAB, further appeals go to the Maryland Tax Court and then the Circuit Court. Each level has its own deadline, and missing any of them ends the process. Most homeowners with solid comparable-sales evidence resolve their case at the supervisor level or PTAAB.
Payment Deadlines and Late Penalties
Montgomery County property tax bills are due on or before September 30 each year and become delinquent on October 1. If you pay semiannually, the first installment follows the September 30 deadline, and the second installment is due December 31, becoming delinquent January 1.14Montgomery County, Maryland. Interest and Penalty Assessed on Property Tax Bills and How to Make Payments
Late penalties are aggressive. Delinquent bills accrue charges at 1⅔% per month on the unpaid balance, which works out to 20% annually (8% interest and 12% penalty). That rate starts running immediately on October 1 if you miss the deadline, and it compounds on the net amount after any credits are applied.14Montgomery County, Maryland. Interest and Penalty Assessed on Property Tax Bills and How to Make Payments
What Happens If You Don’t Pay
Unpaid property taxes create a lien on your property from the day they’re due. Maryland law requires each county’s tax collector to sell these liens at public auction through a tax sale.15Maryland Department of Assessments and Taxation. Office of the State Tax Sale Ombudsman The county doesn’t sell your house. It sells the right to collect the debt. The winning bidder receives a tax lien certificate, and the county’s lien transfers to that buyer.
Before any tax sale, the county must mail you a notice at least 30 days before the property is first advertised and then publish the listing in local newspapers for four consecutive weeks. You can redeem your property at any time before a court finalizes foreclosure by paying the full tax sale price plus interest at 1.5% per month (18% annually), along with any taxes, interest, and penalties that accrued after the sale.15Maryland Department of Assessments and Taxation. Office of the State Tax Sale Ombudsman
The timeline escalates quickly. After six months, the lien purchaser can file a complaint in court to foreclose your right to redeem. If the purchaser doesn’t act within two years of the sale date, the certificate becomes void, but most lien purchasers move to foreclose as soon as they’re eligible.15Maryland Department of Assessments and Taxation. Office of the State Tax Sale Ombudsman
Why Your Mortgage Payment Just Went Up
If you have a mortgage, your lender likely collects property taxes through an escrow account built into your monthly payment. When your tax bill rises, the escrow account develops a shortage because the balance falls below what’s needed to cover the higher taxes. Federal law under the Real Estate Settlement Procedures Act requires your loan servicer to perform an annual escrow analysis and send you a statement within 30 days of completing it.16Consumer Financial Protection Bureau. Escrow Accounts
That statement will show any shortage and explain how your monthly payment is changing to cover it. In most cases, the servicer spreads the shortage repayment over the next 12 months, so your payment increases by a manageable amount rather than requiring a lump sum. If your assessment jumped after a reassessment, expect your escrow payment to keep rising in stages as the phased-in assessment climbs each year. When your mortgage payment goes up and your interest rate hasn’t changed, the property tax increase is almost always the reason.