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Maryland’s tax system is about to hit the pause button for a major summer reset. The state will shut down its tax computers for a planned two-week migration from Friday, Aug. 21, through Monday, Aug. 31, as decades of records move into a new cloud-based portal. Maryland Tax Connect is scheduled to launch for individual filers on Tuesday, Sept. 1, after the state transfers and validates more than 4 billion tax records in what officials say is the first systemwide overhaul of Maryland’s tax infrastructure in more than 30 years. Once the dust settles, millions of residents will be filing and paying taxes in a very different way.
Key dates and deadlines
If you are the type who waits until the last minute, this is the year to rethink that strategy. The final day to make in-person paper check payments at branch offices for personal, pass-through, and fiduciary taxes is Friday, July 24, at 4:30 p.m. For individual filers, Wednesday, July 29, is the last day to electronically file or pay using the legacy systems.
Businesses get a bit more runway, but not much. Thursday, Aug. 20, is the final day to electronically file and pay business taxes before the systems are taken down for the migration starting Aug. 21. A fuller list of cutover dates and the Comptroller’s timeline is summarized by Daily Voice.
Payments during the cutover
Even while the main systems are offline, taxpayers will still be able to make electronic payments by e-check and credit card during the migration window. There is a catch, though. Funds debited in late August may not actually show up on taxpayer accounts until after Sept. 1.
Mailed-in paper checks for the affected tax types will sit tight during the cutover and will not be processed. The Comptroller’s Office says it will not assess penalties for filing or payment deadlines that fall within the outage period. The agency’s guidance and FAQs walk through details such as e-check timing, limited staff access during the migration, and where to get help. For full instructions, see the Comptroller of Maryland.
Why the overhaul matters
This is not just a cosmetic upgrade. The state is retiring COBOL-based mainframe systems that the Comptroller’s Office says were never designed for today’s expectations around security, transparency, and accessibility. Many business tax functions have already made the jump to Maryland Tax Connect. Bringing individual filers onto the same platform will centralize accounts and tax histories for more than 3 million taxpayers.
The scope of the project and the rationale for the August cutover are detailed in state budget documents. For background, see the DBM budget testimony.
What taxpayers should do now
If you have a return or payment due in late July or August, the safest move is to file or pay early and use the fee-free e-check option, since mailed checks will not be processed during the cutover. Tax preparers are advised to download client records, double-check any pending payments, and lock in filing plans well before the key dates. Businesses should confirm that all required filings and estimated payments are submitted ahead of Aug. 20.
Checklists, step-by-step guides, and FAQs are available on the Maryland Tax Connect information hub on the Comptroller of Maryland site.
The upgrade is designed to make filing and paying taxes simpler once it is fully in place, but it will bring a short burst of disruption at the end of the summer. If you are unsure how the timeline affects you, call 1-800-MD-TAXES or review the Comptroller’s information hub before July 29.
