Maryland Tax Connect: Key Deadlines & What to Do Now
Maryland is shutting down its current online tax system and launching a brand-new portal called Maryland Tax Connect on September 1, 2025. If you're an individual filer, business owner, or tax professional in Maryland, this transition comes with hard deadlines, a full system blackout in August, and a completely new way to manage your state tax account. Missing the cutoff dates could mean delayed filings and payments sitting in limbo. Here's everything you need to know to stay in tax compliance and avoid surprises, whether you file on your own or work with a tax attorney.
Key Deadline: July 29 for Individual Taxpayers
Tuesday, July 29 at 11:59 p.m. is the last chance to electronically file a return or make a payment through the Comptroller's current individual taxpayer website. After that, online filing and payment services for individuals go dark until Maryland Tax Connect launches on September 1.
If you missed the July 24 deadline for in-person paper checks at branch offices (for personal income, pass-through entity, and fiduciary taxes), electronic payments and money orders are still accepted. Paper check payments resume September 1.
Why Maryland Is Making This Change
Maryland's old system ran on COBOL, a programming language from the 1960s. Comptroller Lierman's office says it was past its useful life. This isn't an optional tech upgrade; it's necessary infrastructure replacement.
Business taxpayers have already been using Maryland Tax Connect. The September 1 launch brings individual filers, pass-through entities, trusts, and estates onto the same platform, completing the migration of roughly four billion tax records into one modern system.
What the New Portal Means for Individual Filers
Right now, Maryland taxpayers juggle multiple systems (iFile, a separate bill-pay site, etc.). Maryland Tax Connect consolidates everything into one place. Once live, you'll be able to:
File income tax returns and make estimated or extension payments
View real-time account balances and full payment history
Access notices from the Comptroller's Office
Check refund status
Set up and manage payment plans directly
Use direct debit and e-check payment options
The Comptroller's Office expects faster processing, stronger cybersecurity, and more self-service options, meaning fewer phone calls and branch visits for routine questions.
What This Means for Business Taxpayers
If you run a business in Maryland, your deadline is different: August 20 at 11:59 p.m. is the last day to electronically file and pay business taxes via Maryland Tax Connect before the migration blackout. Normal operations resume September 1.
For business owners juggling state tax compliance obligations alongside federal requirements, the transition period requires extra attention. A business tax attorney can help ensure nothing falls through the cracks during the changeover.
What Tax Professionals Should Know
For practitioners, the new platform should reduce delays in confirming payments, monitoring balances, and responding to notices. More immediate access to client account information is a significant improvement over the legacy system's posting lags.
The Compliance and Enforcement Angle
Here's the part most taxpayers won't hear about elsewhere: Maryland Tax Connect includes updated validation tools, enhanced security protocols, and new fraud detection models. Fraud prevention is built into this system from the ground up.
A 2024 legislative audit of the Revenue Administration Division found control gaps in the old system, including inconsistent screening of fraudulent returns and insufficient review of certain refund checks. A modern platform is designed to close those gaps.
What this means practically: once the system stabilizes, discrepancies may surface faster and get routed more accurately than before. If you've relied on delays or quirks in the old system, those are likely going away. Good recordkeeping and timely responses to notices will matter more than ever.
That said, any time billions of records migrate to a new platform, some account histories or payment postings may need reconciliation. If you're already dealing with a tax controversy or dispute with the Comptroller, keeping complete records during this transition is especially critical.
The August Blackout: August 21–31
From August 21 through August 31, all systems go offline for final migration. Here's what you need to know:
E-check and credit card payments are still accepted and debited from your bank, but they won't post until after September 1
The Comptroller will not assess penalties for any filing or payment deadline within the outage window
You should retain payment confirmations, screenshots, and bank records until transactions appear in your Maryland Tax Connect account
Key Dates at a Glance
| Date | What Happens |
|---|---|
| July 29 | Last day (11:59 p.m.) for individuals to e-file or pay on the current website |
| August 20 | Last day (11:59 p.m.) to e-file and pay business taxes before migration |
| August 21–31 | All systems offline. Payments accepted but won't post until September 1. No penalties for deadlines in this window |
| September 1 | Maryland Tax Connect goes live for all taxpayers. All services resume |
What You Should Do Now
File or pay before July 29 if you have any pending individual tax obligations
Save confirmations for anything you submit during the transition
Monitor your account closely after September 1 for posting accuracy
Keep paper records of all payments made during the August blackout
Maryland Tax Connect is the biggest change to the state's tax administration in over 30 years. For most taxpayers, the transition should ultimately make things easier, but "ultimately" isn't the same as "immediately." The blackout period, delayed postings, and billions of migrating records all create room for errors, and errors with the Comptroller's Office tend to compound quickly if they aren't addressed early.
If you have an active payment plan, a pending dispute, or unresolved notices with the state, don't wait until September to see how things shake out. A tax lawyer who understands Maryland's enforcement process can help you document everything now and respond fast if the migration creates discrepancies in your account.
Contact Kundra Tax Law to discuss your situation →
Frequently Asked Questions
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Individual online filing and payments end July 29 at 11:59 p.m. Business e-filing ends August 20. All systems go offline August 21–31 for final migration, and Maryland Tax Connect launches September 1.
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No. The Comptroller has stated that no penalties will be assessed for filing or payment deadlines falling within the August 21–31 outage window. However, keep documentation of any payment you initiate during this period.
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Maryland is migrating approximately four billion tax records to the new platform. Most should transfer cleanly, but some account histories may need reconciliation. Maintain your own records as a backup.
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If you have pending disputes, payment plans, or unresolved issues with the Comptroller's Office, yes. A tax attorney can monitor your account and intervene quickly if the migration creates discrepancies.