Carroll County property tax for fiscal year 2025–2026 is billed at $1.018 per $100 of assessed value, plus a Maryland state rate of $0.112 per $100. Bills go out in July and August, and you can pay the full amount without interest through September 30. A 5% homestead cap and an income-based homeowners’ credit can reduce what you actually owe.
How Your Bill Is Calculated
Maryland expresses property tax as a dollar amount per $100 of assessed value. Divide your assessed value by 100, then multiply by the tax rate. For a home assessed at $300,000, the county portion works out to $3,054 ($300,000 ÷ 100 × $1.018), and the state portion adds another $336 ($300,000 ÷ 100 × $0.112), for a combined bill of about $3,390.
If your property sits inside an incorporated municipality such as Taneytown or Westminster, a separate municipal rate appears on the bill on top of the county and state amounts.
The county rate is set fresh each year by the Board of County Commissioners during the annual budget process, so the figure above applies to this fiscal year and can shift the next.
Why Your Assessed Value Changes
The Maryland State Department of Assessments and Taxation (SDAT) reappraises every parcel in Carroll County once every three years. Assessors look at comparable sales, review building permits for renovations or additions, and inspect properties to account for changes that affect market value.
When a reassessment raises your value, the increase phases in over three years: one-third the first year, two-thirds the second, and the full amount by the third. If the value drops, the lower figure takes effect right away. The phase-in exists specifically to soften the impact of large jumps.
SDAT can also revalue a property between scheduled cycles if the owner requests a zoning change, the use of the property changes, or improvements worth at least $100,000 are substantially completed.
When Property Tax Is Due
Bills are mailed in July and August for the fiscal year that begins July 1. The tax is legally due July 1, but you have until September 30 to pay in full without interest. After September 30, the balance is in arrears and interest and penalties begin to accrue.
Carroll County offers a semi-annual option: the first installment is due by September 30 and the second before January 1. A service charge applies to the semi-annual plan, but it’s waived if you pay both installments by September 30. Unpaid second installments become delinquent January 1.
The county does not waive interest or penalties for missed deadlines, regardless of the reason.
How to Pay
Payments go through the Carroll County Collections/Tax Office. You have four options:
- Online at paybill.carrollcountymd.gov, using a credit card (Visa, MasterCard, Discover, American Express) or ACH e-check. Credit and debit card payments carry a 3.25% convenience fee; e-checks cost $1.50.
- By phone at (410) 386-2971, Option 3. The same vendor fees apply.
- By mail to the Carroll County Collections/Tax Office, 225 North Center Street, Westminster, Maryland 21157. Include your property account number on the check.
- In person at the county office building, or through a secure drop box for contact-free submission.
Include your property account number no matter which method you choose, so the payment posts to the correct parcel. If you’ve lost the bill, you can look up your account through the online portal or call the Collections/Tax Office directly.
Credits That Lower Your Bill
Homestead Property Tax Credit
The homestead credit caps the annual increase in your property’s taxable assessment. Carroll County sets that cap at 5%, one of the lowest in Maryland and well below the state maximum of 10%. Even if a reassessment raises your value by 20%, the taxable value used to calculate your bill can only climb 5% a year until it catches up.
The property has to be your principal residence, and you must have lived there for at least six months before applying. File an initial application with SDAT once; the credit then renews automatically as long as you continue to occupy the home. It applies to county, state, and municipal property tax.
Homeowners’ Property Tax Credit
This is a separate, income-based credit for homeowners whose tax bill is large relative to their household income. Combined gross household income must be no more than $60,000, and net worth (excluding the home and qualified retirement accounts) must be under $200,000. The property must be your principal residence for at least six months of the year, including July 1.
The credit is not limited to seniors. Applications are due October 1 each year and are available through SDAT or Carroll County’s Division of Aging and Disabilities.
Disabled Veterans and Surviving Spouses
Maryland offers property tax credits for disabled veterans and, in some cases, surviving spouses of military personnel killed in action. Eligibility and credit amounts depend on factors like disability rating and service dates. Contact the Carroll County Collections/Tax Office or SDAT for specifics.
Appealing Your Assessment
If you receive an assessment notice and think the value is wrong, you have 45 days from the notice date to file an appeal with SDAT. The first-level Supervisor’s hearing is informal: you sit down with an assessor and present evidence such as comparable sales, photos of conditions the assessor may not have seen, or a private appraisal.
If the Supervisor’s decision doesn’t resolve it, you can appeal to the Property Tax Assessment Appeals Board within 30 days, and from there to the Maryland Tax Court within another 30 days. Most disputes end at the first level.
Two other windows are worth knowing. In a year when your property isn’t scheduled for reassessment, you can file a petition for review by the first business day after January 1. And if you bought the property between January 1 and July 1, you have 60 days from the transfer to appeal.
What Happens If You Don’t Pay
Once the balance is delinquent, interest and penalties start accruing on the unpaid amount, and the county will not waive them.
Fall at least $250 behind and the unpaid taxes become a lien on your property. The county can sell that lien at its annual tax sale. A third-party buyer pays your back taxes and earns interest on the amount they paid. In Carroll County, the redemption interest rate is 14% per year.
You still have at least six months after the sale to redeem the property. Redemption means paying the sale price plus interest, any taxes and penalties that piled up after the sale, and, after four months, recording fees, a title search fee up to $250, and attorney’s fees up to $500. Miss that window and the lien purchaser can file a foreclosure action to end your right to reclaim the property. Once the foreclosure complaint is filed, the attorney fee cap no longer applies, and costs climb quickly.
Catching up before a tax sale is dramatically cheaper than catching up after one. If paying on time is a problem, call the Collections/Tax Office before enforcement starts.
If Your Mortgage Includes Escrow
Most homeowners with a mortgage don’t pay Carroll County directly. The lender collects a share of the estimated annual tax each month, holds it in escrow, and pays the bill when it arrives.
Federal rules require your servicer to run an annual escrow analysis and adjust the monthly payment based on the latest tax bill and insurance premiums. When the county rate rises or a reassessment raises your taxable value, the monthly payment goes up to match. A shortage means the servicer will either ask for a lump sum or spread the gap across the next 12 months.
Recently purchased homes are especially prone to escrow shortages. The prior owner’s homestead credit or other exemptions may have held the taxable value down, and once the property transfers, the assessment can reset toward full market value, driving a noticeable escrow increase in the first year or two. Read the annual escrow statement when it arrives.