500: Maryland Corporation Income Tax Return (2025)
Maryland · Comptroller of Maryland · Used for tax years 2025
Maryland Form 500 is the 2025 Corporation Income Tax Return. It reports federal taxable income, Maryland adjustments and modifications, applicable income apportionment, tax, payments, credits, and any balance due or refund. It can also be used to amend a previously filed return.
Who files this form
Form 500 is Maryland’s Corporation Income Tax Return for tax year 2025.
If the corporation files federal Form 1120S, the form directs it to file Maryland Form 510 instead. The supplied form does not state the full rules for determining which corporations must file.
What you'll need
- Federal return: Attach a copy of the federal income tax return through Schedule M2.
- Corporation information: Have the corporation’s name, mailing address, nine-digit Federal Employer Identification Number (FEIN), organization or incorporation date, and six-digit business activity code ready. The form also has a field for the FEIN application date.
- Payments and credits: Gather amounts paid with Forms 500D and 500E, any prior-year overpayment credited to this year, and applicable credit and withholding information.
- Net operating loss claim: Attach copies of the federal form for the loss year and Form 1139.
- Tax paid by pass-through entities: Attach Maryland Schedule K-1 (510/511) when reporting nonresident tax paid on the corporation’s behalf on line 15f.
- Supporting schedules: Attach schedules for other additions and subtractions where the form requires them. For an amended return, show detailed computations and attach schedules as necessary.
- Direct deposit: Have the account type, nine-digit routing number, account number, and name on the bank account available.
How to file
Electronic filing: You must file Form 500 electronically to claim business tax credits from Form 500CR.
Paper filing: Print using blue or black ink. Include all required pages of Form 500 and the required attachments. Complete the officer’s signature, name, title, and date fields. The form marks the preparer’s signature and PTIN as required by law.
Mail to:
Comptroller Of Maryland
Revenue Administration Division
110 Carroll Street
Annapolis, Maryland 21411-0001
Payment: Make a check or money order payable to Comptroller of Maryland. In blue or black ink, include the FEIN, tax year, and tax type on the payment. The form marks a place on page 1 to staple the check.
Common mistakes
- Leaving identifying information off a payment: The form warns that omitting the FEIN, tax year, or tax type will delay payment processing.
- Entering an NOL carryover on line 7c: The form specifically says not to enter it there. Line 5 is for the adjusted federal NOL carryforward available from previous tax years.
- Using negative entries where positive amounts are required: The Maryland adjustments to federal taxable income and the addition and subtraction modification sections require positive entries. Line 5 also requires the NOL as a positive amount.
- Entering unclear or incorrect bank details: Verify that all direct-deposit account information is correct and clearly legible.
- Omitting required pages or the federal return: Include all required Form 500 pages and attach the federal income tax return through Schedule M2.
- Claiming Form 500CR credits on a paper return: The form requires electronic filing to claim these business tax credits.
Questions people ask
What tax rate does the 2025 form use?
Line 14 instructs you to multiply Maryland taxable income on line 13 by 8.25%.
Can the corporation receive its refund by direct deposit?
Yes. Check the authorization box and provide the account type, routing number, account number, and name on the bank account. Check the separate box if the refund will go to an account outside the United States.
How do I explain changes on an amended return?
Check the amended-return box on page 1. On page 3, select the reason or reasons for amending and explain the changes to income, modifications, the apportionment factor, and credits. Show computations in detail and attach schedules or additional pages as needed.
Who completes the apportionment section?
The income apportionment section is for multistate corporations whose apportionment factor is less than 1. Otherwise, the form says to skip to line 13. Schedule A on page 4 computes the apportionment factor and applies only to multistate corporations.