How Baltimore County Tax Sale Works for Owners and Bidders

The Baltimore County tax sale is an annual auction where investors bid on liens against properties with unpaid real property taxes, water and sewer charges, or Metropolitan District assessments. The county sells a certificate rather than the property itself. The delinquent owner keeps the right to redeem by paying what is owed plus 12% interest, and only if that redemption never happens can the certificate holder go to court to take title. The 2025 sale was held on August 28.¹

When a Property Ends Up on the List

Maryland law requires the county tax collector to sell any property where taxes are in arrears, with the sale occurring no later than two years after the taxes became delinquent.² Vacant lots, single-family homes, and commercial buildings all appear in the same auction catalog. Baltimore County advertises the list in local newspapers before the sale, and the official tax sale website posts every certificate available for bidding.

Notice Before the Sale

At least 30 days before advertising a property, the tax collector must mail a final notice to the last known owner on the tax roll. That notice itemizes each delinquent tax amount and warns that the property will be sold unless the full balance is paid within 30 days.³

One caution for owners who never got that letter: the statute says a collector’s failure to mail the notice, or to include a particular tax on it, does not invalidate the sale or affect the purchaser’s title.³ If you suspect your property is heading to sale, act on that suspicion. Do not wait to see whether the notice arrives.

How Owners Can Stop the Sale

Baltimore County offers two routes for residential taxpayers who cannot pay in full. The Hardship Installment Payment Program is open to homeowners who have experienced a temporary financial setback. Eligibility turns on hardship, ability to repay, and financial disclosure, and the application must be filed by the end of February to keep the property out of that year’s sale.⁴ Approval covers only the current fiscal year, and all future taxes must stay current for you to remain in the program.

Owners can also submit partial payments through the end of February. These do not stop interest from accruing, but they reduce the balance interest is charged on. Partial payments cannot be made online and must be delivered directly to the county.⁴ After February passes without full payment, the options for pulling the property back off the list narrow sharply.

Redeeming After the Sale

Redemption is how an owner keeps the property after a certificate has been sold. The owner, or another interested party such as a mortgage holder, pays the tax collector the full amount the certificate holder paid at the sale, plus 12% interest from the sale date, plus any taxes, interest, and penalties the certificate holder paid afterward.⁵ The owner also covers reimbursable attorney fees and expenses the certificate holder incurred in any foreclosure process.

Owner-occupied residential property gets one meaningful protection: taxes that accrued after the sale date may not be added to the redemption amount the owner pays.⁵ Once the collector receives the correct amount, a certificate of redemption is issued.

Foreclosure If the Owner Does Not Redeem

A certificate holder who is never paid can eventually go to the Circuit Court for Baltimore County to terminate the owner’s right of redemption. The waiting period depends on the property:

Non-owner-occupied property: six months from the sale date.
Owner-occupied residential property: nine months from the sale date.
Buildings that the appropriate government agency has certified as needing substantial repair to meet building code: 60 days.

Before filing, the certificate holder must send two separate notices to the owner and any current mortgage holder. The complaint cannot be filed until at least two months after the first notice and at least 30 days after the second.⁶

A hard cutoff runs against the certificate holder too. If the foreclosure complaint is not filed within two years of the sale, the certificate becomes void and the investment is lost. Once the court enters a final decree, the certificate holder records it in the land records to establish ownership.

Registering as a Bidder

Bidders register through Baltimore County’s online tax sale portal. Registration requires a completed Bidder Registration Form, a Social Security number or tax identification number submitted on a substitute IRS Form W-9, and a $100 registration fee paid by ACH debit.⁷ Each bidder enters a valid bank account, which the county uses for all auction-day payments.

LLCs, partnerships, and corporations have more to do. They must register under the legal entity name recorded with the Maryland State Department of Assessments and Taxation, be in good standing, and be qualified to do business in Maryland. The county may request resident agent information, officer and member details, and the street address of the principal place of business.⁷ Every bidder sets a budget at registration, and the system will not accept bids that exceed available funds.

How the Auction Runs

The auction is entirely online. Registered bidders browse a digital catalog of certificates, each representing the delinquent taxes, interest, and penalties on a specific property. Bids reflect what an investor is willing to pay for that lien, and the highest bidder wins the certificate. Experienced investors often bid on many certificates at once, held in check by the budget set at registration.

What Winning Bidders Pay

Winning bidders must pay in full on the day of the auction by 4:30 PM, via ACH debit from the bank account provided at registration. The payment covers all delinquent taxes, interest, penalties, and the county’s expenses in conducting the sale.¹ The account is debited automatically, so funds need to be in place before the deadline. Failure to pay by the deadline forfeits both the certificate and the $100 registration fee.

The High Bid Premium

When a winning bid exceeds 40% of the property’s assessed value (as recorded by the State Department of Assessments and Taxation), the bidder owes an additional high bid premium equal to 20% of the amount by which the bid exceeds that 40% threshold.⁸ On a property assessed at $100,000, a winning bid of $50,000 exceeds the $40,000 threshold by $10,000, so the premium is $2,000.

The 12% Interest Return

Baltimore County sets the redemption interest rate at 12% per year, computed from the sale date to the redemption date.¹ The rate is established under the Baltimore County Code, not the state statute, and it differs from what other Maryland counties charge. Interest accrues automatically, and the owner must pay it all when redeeming.

Subsequent Taxes During the Waiting Period

Taxes that fall due after the sale do not disappear. They become additional liens, and once the court issues a final foreclosure decree, they become immediately due from the certificate holder. The collector will not deliver a deed until all subsequent taxes, interest, and penalties are paid.⁹ If the owner redeems instead, those subsequent tax payments are reimbursed as part of the redemption amount.

Environmental Liability Risk for Bidders

Under the federal Comprehensive Environmental Response, Compensation, and Liability Act, any person who owns a contaminated property can be held responsible for cleanup costs regardless of who caused the contamination.¹⁰ That liability attaches the moment a foreclosure decree makes you the owner.

A secured creditor exemption exists for lenders who acquire property through foreclosure, but it applies only if the lien was held primarily to protect a security interest and the property is disposed of at the earliest commercially reasonable time. Courts have generally treated periods under twelve months as acceptable for divestiture. The exemption also requires that the certificate holder did not participate in managing the property’s operations before foreclosure, which can become an issue if an investor steps in to oversee a commercial or industrial site during the waiting period.

Before bidding on any certificate tied to commercial, industrial, or vacant land with an unknown history, research the environmental background. Cleanup costs under CERCLA can far exceed the value of the property, and a low-cost certificate on contaminated land can turn into a six- or seven-figure liability.

1
Baltimore County Government. Tax Sale: Public Notice and Legal Authority
2
CaseMine. Maryland Code Tax-Property 14-808 – Sale by Collector; Exceptions
3
Maryland General Assembly. Maryland Code Tax-Property 14-812
4
Baltimore County Government. Late or Unpaid Taxes
5
Maryland General Assembly. Maryland Code Tax-Property 14-828 – Payment for Redemption
6
Maryland General Assembly. Maryland Code Tax-Property 14-833
7
Baltimore County Government. Collector’s Terms
8
Maryland State Department of Assessments and Taxation. Office of the State Tax Sale Ombudsman
9
Maryland General Assembly. Maryland Tax-Property Code Section 14-831 (2025)
10
Office of the Law Revision Counsel. 42 USC 9607