Maryland Annual Report Deadline — April 15
Every Maryland business entity — LLCs, corporations, partnerships, and sole proprietorships — must file an Annual Report and Business Personal Property Return (SDAT Form 1) by April 15 each year. This is not a tax return in the traditional sense, but it is a compliance requirement to maintain your good standing with the Maryland State Department of Assessments and Taxation (SDAT).
Missing this deadline means your business can be forfeited, which creates serious legal and financial complications. The filing fee varies by entity type, and you can file online at the Maryland Business Express portal.
Key Annual Report Dates:
- January 1 — Annual reports open for filing
- April 15 — Annual report due (all entity types)
Maryland Income Tax Deadlines by Business Structure
Your income tax deadline depends on how your business is structured. Here is a breakdown for each entity type.
C Corporations
Maryland C corporations file Form 500 (Maryland Corporation Income Tax Return) and pay an 8.25% corporate income tax on net income allocable to Maryland. For calendar year filers, the return and payment are due by April 15 (the 15th day of the fourth month after the tax year ends). An automatic six-month extension is available, pushing the filing deadline to October 15, but this is an extension to file — not to pay. Any taxes owed are still due on April 15.
S Corporations and Partnerships
S corporations and multi-member LLCs taxed as partnerships file Form 510 and must submit by March 15 (the 15th day of the third month after the tax year ends). An automatic six-month extension moves the filing deadline to September 15, but payment is still due March 15.
Single-Member LLCs and Sole Proprietors
If you operate as a sole proprietor or single-member LLC, your business income is reported on your personal Maryland income tax return (Form 502). The deadline is April 15, with an automatic extension to October 15 available. Payment is still due April 15.
Estimated Tax Payments
If you expect to owe Maryland income tax of $500 or more after withholding and credits, you are required to make quarterly estimated tax payments. For calendar year filers, the 2026 estimated payment schedule is:
| Payment | Due Date |
|---|---|
| Q1 | April 15, 2026 |
| Q2 | June 15, 2026 |
| Q3 | September 15, 2026 |
| Q4 | January 15, 2027 |
Maryland Payroll Tax Deadlines
If you have employees in Maryland, you have ongoing payroll tax obligations at both the state and federal level. Maryland requires employers to withhold state income tax from employee wages and remit it to the Comptroller on a regular schedule.
Deposit frequency depends on your total withholding liability:
- Monthly depositors — Deposit by the 15th of the following month
- Quarterly filers — File quarterly returns by the 15th day of the month following the quarter
- Semi-weekly depositors — Larger employers must deposit within 1-3 business days of payroll
| Quarter | Period | Due Date |
|---|---|---|
| Q1 | January – March | April 15 |
| Q2 | April – June | July 15 |
| Q3 | July – September | October 15 |
| Q4 | October – December | January 15 |
Maryland Sales and Use Tax Deadlines
If your Frederick business sells taxable goods or services, you are required to collect Maryland’s 6% sales and use tax and remit it to the Comptroller. Quarterly filers (most small businesses) file by the 20th of the month following each quarter:
| Quarter | Period | Due Date |
|---|---|---|
| Q1 | January – March | April 20 |
| Q2 | April – June | July 20 |
| Q3 | July – September | October 20 |
| Q4 | October – December | January 20 |
Frederick County Local Tax Considerations
Maryland is unique in that every county imposes a local income tax in addition to the state rate. Frederick County’s local income tax rate is 2.96%, which is added on top of the state rate of 2%–5.75%. This means Frederick business owners and their employees can face a combined state and local rate of up to 8.71% on income.
Key Maryland Tax Deadlines at a Glance
| Deadline | What’s Due |
|---|---|
| January 15 | Q4 estimated income tax payment |
| January 20 | Q4 sales tax return |
| March 15 | S corporation and partnership income tax returns |
| April 15 | Annual Report (all entities), C corporation returns, sole proprietor returns, Q1 estimated payment, Q1 payroll returns |
| April 20 | Q1 sales tax return |
| June 15 | Q2 estimated income tax payment |
| July 15 | Q2 payroll tax returns |
| July 20 | Q2 sales tax return |
| September 15 | Q3 estimated payment; S corp/partnership extension deadline |
| October 15 | Q3 payroll returns; C corp and individual extension deadline |
| October 20 | Q3 sales tax return |
Common Mistakes Frederick Business Owners Make
Confusing extensions to file with extensions to pay. Maryland’s automatic extensions give you extra time to submit your paperwork, but they do not delay the payment due date. If you owe taxes, you must pay by the original deadline to avoid interest and penalties.
Forgetting the Annual Report. Many business owners focus on income taxes and overlook the SDAT Annual Report. Missing this April 15 deadline can result in your business being forfeited — a serious legal problem that takes time and money to fix.
Underestimating quarterly estimated payments. If your business is profitable, you need to be making quarterly payments throughout the year. Waiting until April to pay a full year of taxes often results in an underpayment penalty.
Not accounting for Frederick County’s local tax rate. When planning your tax liability, always factor in the 2.96% Frederick County local income tax on top of the state rate.
How Premier Plus Bookkeeping Helps Frederick Businesses Stay on Track
Keeping up with Maryland’s tax calendar is a full-time job on its own — and that’s before you factor in running your actual business. At Premier Plus Bookkeeping, we help Frederick small businesses stay compliant by tracking all state and federal tax deadlines, preparing and filing quarterly payroll tax returns, calculating quarterly estimated tax payments, reconciling your books monthly, and filing your Maryland Annual Report on time every year.
If you’re a small business owner in Frederick, MD and want to stop worrying about tax deadlines, we’d love to help. Contact us today for a free consultation and let us take tax compliance off your plate.