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An S Corporation is not a type of business entity. It is a federal tax classification available to qualifying corporations and LLCs that elect to have their business income pass through to shareholders for tax purposes.
The S Corp designation is governed by Subchapter S of the Internal Revenue Code. When you elect S Corp status, the business itself generally does not pay federal income tax. Instead, income, losses, deductions, and credits flow through to shareholders, who report them on their personal returns. [13]
In Maryland, an S Corporation files Form 510, Pass-Through Entity Income Tax Return. By default, the S Corp withholds Maryland tax on the distributive share of nonresident shareholders and remits it on Form 510. Shareholders then pay Maryland personal income tax on their pass-through share at the state rate (up to 6.50%) plus the county piggyback rate (2.25% to 3.30%, depending on county of residence). [1] [9] [10]
Alternatively, an S Corp may elect to pay Maryland tax at the entity level by filing Form 511, the Pass-Through Entity Election Income Tax Return. The Form 511 rate is the top individual rate plus the lowest county rate for individual members, or 8.25% for corporate members. The PTE election preserves the federal SALT deduction at the entity level. [7]
For business owners earning $60,000 or more in net business income, the S Corp election can provide meaningful self-employment tax savings. Only the salary you pay yourself as a W-2 employee is subject to Social Security and Medicare taxes; distributions beyond reasonable compensation are not.
| Action | Deadline | Notes |
|---|---|---|
| File IRS Form 2553 | Within 2 months and 15 days after the start of the tax year | For a January 1 tax year, the deadline is March 15. Late election relief may be available under IRS Rev. Proc. 2013-30. [3] |
| File Form 510 (Maryland) | April 15 (calendar-year filers) | 15th day of the 4th month after the close of the tax year. Reports income and withholds on nonresident distributive share. [1] |
| File Form 1120-S (Federal) | March 15 (calendar-year filers) | Distribute Schedule K-1s to shareholders. [3] |
| File Form 511 (if PTE elected) | April 15 (calendar-year filers) | Used instead of Form 510 when the S Corp elects entity-level taxation. Same April 15 deadline. [7] |
| Maryland extension (Form 510E) | On or before April 15 | Grants an automatic 7-month extension for S Corp returns. Payment of any balance due is still required by April 15. [1] |
| File Annual Report and Personal Property Return (Form 1) | April 15 | Filed with SDAT. $300 flat fee. A 60-day extension to June 15 is available on request. [5] |
| Pay quarterly estimated tax (Form 510D) | April 15, June 15, September 15, December 15 | Required if expected Maryland liability exceeds $1,000. [7] |
| Set up payroll | Before paying yourself a salary | Register with the Maryland Department of Labor (BEACON) for unemployment insurance and with the Comptroller of Maryland for withholding before issuing W-2 wages. [11] [12] |
An S Corp is a tax classification, not a standalone entity. You must have an active Maryland corporation or LLC on file with SDAT before you can elect S Corp tax treatment with the IRS.
If you want to form an LLC first, check this guide.
If you want to incorporate as a C Corp first, check this guide.
Already have an existing LLC or corporation? Move to Step 1.
Form 2553, Election by a Small Business Corporation, is the IRS form that officially elects S Corp tax treatment at the federal level. It must be filed no later than 2 months, and 15 days after the beginning of the tax year, the election is to take effect. For a calendar-year corporation electing S Corp status for 2026, the deadline is March 15, 2026. [3]
Form 2553 collects the following information:
All shareholders must sign the consent portion of the form before submission. An unsigned form will be rejected by the IRS.
You can submit Form 2553 by mail or fax. There is no filing fee.
If your principal business office is located in Maryland, mail Form 2553 to: Department of the Treasury, Internal Revenue Service, Kansas City, MO 64999. [8]
Fax number for Maryland businesses: 855-887-7734. [8]
Faxing is typically faster than mailing. Keep your fax confirmation receipt. The IRS will issue a CP261 acceptance notice to confirm your S Corporation election.
Maryland follows the federal S Corp classification automatically. Once your federal Form 2553 is accepted, Maryland will treat your business as an S Corp for tax purposes when you file Form 510 (or Form 511 if you elect entity-level taxation). There is no separate Maryland election form to submit. [1]
After your federal acceptance, attach a copy of your IRS CP261 acceptance letter to your first Form 510 filing as documentation.
As an S Corp shareholder-employee, you are required to pay yourself a reasonable salary through W-2 payroll. The IRS scrutinizes S Corps that pay unreasonably low salaries to avoid payroll taxes.
The IRS expects your salary to reflect what someone performing similar work, in the same industry and the same region, would typically earn. There is no fixed formula, but the IRS flags S Corps where compensation is well below market and most of the owner’s pay comes through distributions.
Setting your salary too low risks the IRS reclassifying distributions as wages, making them subject to payroll taxes plus penalties and interest.
If you do not already have an EIN, apply at no charge on the IRS website (irs.gov). An EIN is a nine-digit federal ID used for tax filings, hiring employees, and opening business accounts.
Note: After obtaining your EIN, open a dedicated business bank account to keep your personal and business finances separate. This is essential to maintain your limited liability protection.
Every Maryland corporation and LLC must file Form 1, the Annual Report and Business Personal Property Return, with SDAT by April 15 each year. The fee is $300 (flat) for corporations, LLCs, LPs, statutory trusts, and LLPs. A 60-day extension to June 15 is available on request through Maryland Business Express. Late filing triggers interest at 2% per 30 days plus a penalty equal to 1/10 of 1% of the county personal-property assessment. [5]
File IRS Form 1120-S and distribute Schedule K-1s to all shareholders by March 15 (calendar-year filers). File Maryland Form 510 by April 15. If the S Corp has elected entity-level taxation, file Form 511 instead of Form 510. [1] [7]
Maryland grants an automatic 7-month extension for S Corp returns when Form 510E is filed by April 15. The extension is for filing only; tax due is still payable by April 15. Federal Form 7004 alone does not extend the Maryland filing. [1]
S Corps that expect to owe more than $1,000 in Maryland tax (entity-level PTE or nonresident withholding) must pay quarterly estimated tax on Form 510D. [7]
Maryland's late-filing penalty is 25% of the unpaid tax (up to a maximum of 25%), plus interest at the rate set annually by the Comptroller. Failure to file the annual report with SDAT may lead to forfeiture of the corporation’s charter. [5] [7]
If you fail to file Form 2553 with the IRS on time, your S Corp election will not take effect for the current tax year. Your business will be taxed as a C Corporation (or as a sole proprietorship/partnership if the underlying entity is an LLC) for that year, costing you the self-employment tax savings until the next tax year.
The IRS offers late election relief under Revenue Procedure 2013-30. To qualify, you must file within 3 years and 75 days of the intended effective date, demonstrate reasonable cause for the late filing, and confirm that the entity has consistently filed as if the S election were in effect. [3]
Because Maryland follows the federal S election automatically, there is no separate state late-election process. Once the IRS grants late election relief, Maryland will treat the entity as an S Corporation for the same tax year. [1]
At the federal level, the S Corp election can be revoked by filing a statement of revocation with the IRS, signed by shareholders holding more than 50% of the outstanding shares. The revocation is effective the first day of the tax year if filed by the 15th day of the third month; later filings take effect the following tax year. [3]
Because Maryland follows the federal classification, a federal revocation automatically terminates the Maryland S Corp status. The entity then files as a C Corp on Form 500 for tax years beginning after the federal revocation. Once revoked, you generally cannot re-elect S Corp status for five years without IRS consent. [1]
By default, Maryland S Corps file Form 510 and withhold tax on the distributive share of nonresident shareholders. The withholding rate is the top Maryland individual rate plus the lowest county rate for individual members, or 8.25% for corporate members. [1] [9]
Maryland allows S Corps and other pass-through entities to elect entity-level taxation on Form 511, the Pass-Through Entity Election Income Tax Return. The election covers all members (resident and nonresident) and is made by checking the Form 511 box for the tax year. Once elected, the tax is paid at the entity level, and members claim a credit on their individual returns. This preserves the federal SALT deduction at the entity level. [7]
| Member Type | Form 511 Rate |
|---|---|
| Individual member | Top individual rate + lowest county rate [7] |
| Corporate member | 8.25% [7] |
| Election deadline | By the original or extended due date of the return [7] |
If the S Corp does not elect Form 511, shareholders pay Maryland personal income tax on their pro rata share of S Corp pass-through items. The state portion uses graduated rates up to 6.50% for 2026 (above $1,000,000 single / $1,200,000 joint, per BRFA 2025), with an additional county piggyback tax ranging from 2.25% (Worcester) to 3.30% (Dorchester). Nonresident shareholders pay only on income derived from Maryland sources. [9] [10]
Maryland imposes a 6% state sales and use tax on tangible personal property and certain services. Register through the Maryland Comptroller and Maryland Business Express. There is no local sales tax. [14]
| Item | Cost |
|---|---|
| Articles of Incorporation (stock corp, base) | $120 ($100 filing + $20 organization fee) [2] |
| Articles of Organization, LLC | $100 standard [2] |
| Expedited filing fee (SDAT) | $50 additional [2] |
| IRS Form 2553 filing | No fee [3] |
| Federal EIN (Form SS-4) | No fee |
| Annual Report and Personal Property Return (Form 1) | $300 per year [5] |
| Registered Agent service (typical commercial) | $100 to $300 per year |
| Feature | S Corporation | LLC |
|---|---|---|
| Formation Document | Articles of Incorporation ($120 base) | Articles of Organization ($100) |
| Federal Tax Treatment | Pass-through (Form 1120-S) | Pass-through by default (Form 1065 or Schedule C) |
| Maryland Tax Treatment | Form 510 (or Form 511 if PTE elected) | Form 510 (if partnership) or none (disregarded) |
| Annual Report Fee | $300 (Form 1) | $300 (Form 1) |
| Self-Employment Tax | Only on W-2 salary | 15.3% on all net earnings |
| Ownership Limits | Max 100 U.S.-person shareholders, one class of stock | Unlimited members, any type |
| Management | Directors and officers required | Flexible; member or manager managed |
| Reasonable Salary Required | Yes | No |
| PTE Election Available | Yes (Form 511) | Yes if taxed as S Corp or partnership |
| Annual Report Deadline | April 15 | April 15 |
| Best For | Owners earning $60K+ wanting SE-tax savings | Small businesses prioritizing simplicity |
The S Corp election makes the most financial sense when your net business income is high enough that the self-employment tax savings outweigh the cost of running payroll and the additional compliance burden. Use this guide:
| Net Business Income | Recommendation |
|---|---|
| Under $40,000 | An S Corp likely does not make sense. Payroll and compliance costs typically erase the savings. |
| $40,000 to $60,000 | Borderline. Run the numbers with a CPA. Savings may be modest after payroll-service fees. |
| $60,000 to $100,000 | S Corp election usually saves $2,000 to $5,000 per year in self-employment taxes. |
| $100,000 to $200,000 | Strong candidate. Savings often $5,000 to $10,000+ per year. |
| Over $200,000 | Almost always advantageous unless you have specific reasons (foreign investors, IPO plans) to remain a C Corp or LLC. |
Keep in mind that Maryland’s $300 annual report fee, payroll setup costs, and ongoing CPA fees together add roughly $1,000 to $3,000 in annual costs. S Corps also have ownership restrictions that may not suit every business model.
| Requirement | Details |
|---|---|
| Form 1120-S (Federal) | Due March 15. Reports S Corp income. Distribute K-1s to shareholders. |
| Form 510 (Maryland) | Due April 15. Pass-Through Entity Income Tax Return. Issue Maryland K-1 to shareholders. [1] |
| Form 511 (if PTE elected) | Due April 15. Pass-Through Entity Election Income Tax Return, in lieu of Form 510. [7] |
| Form 1 (Annual Report and Personal Property Return) | Filed with SDAT by April 15. $300 flat fee. [5] |
| Form 941 (Federal Payroll Tax) | Filed quarterly. Reports federal income tax, Social Security, and Medicare withheld. |
| Forms MW506 / MW508 | Maryland withholding deposits (monthly or quarterly) and annual reconciliation. [12] |
| DLLR-OUI quarterly UI report | Quarterly UI contribution and wage report filed with the Maryland Department of Labor through BEACON. [11] |
| W-2s and 1099s | Distributed by January 31. Filed with the IRS, the Social Security Administration, and the Comptroller of Maryland. |
| Estimated Tax Payments (Form 510D) | Quarterly estimated tax if the expected Maryland liability exceeds $1,000. [7] |
| Registered Agent Maintenance | Keep the resident agent and Maryland principal office current with SDAT. |
[1] Maryland Comptroller. Form 510 Instructions (Pass-Through Entity Income Tax Return). Accessed May 18, 2026.
[2] Maryland State Department of Assessments and Taxation (SDAT). Corporate Charter Fee Schedule. Accessed May 18, 2026.
[3] IRS. Instructions for Form 2553. Accessed May 18, 2026.
[4] Maryland General Assembly. Md. Code, Corporations and Associations § 2-108. Accessed May 18, 2026.
[5] Maryland SDAT. 2026 Form 1, Annual Report and Personal Property Return. Accessed May 18, 2026.
[6] Maryland Comptroller. Business Income Tax Information (8.25% corporate rate). Accessed May 18, 2026.
[7] Maryland Comptroller. Form 511 Instructions (Pass-Through Entity Election Income Tax Return). Accessed May 18, 2026.
[8] IRS. Where to File Your Taxes (for Form 2553). Accessed May 18, 2026.
[9] Maryland Comptroller. Withholding Tax Facts 2026. Accessed May 18, 2026.
[10] Maryland Comptroller. Local and County Tax Rates. Accessed May 18, 2026.
[11] Maryland Department of Labor. Unemployment Insurance: New Employer Registration. Accessed May 18, 2026.
[12] Maryland Comptroller. Employer Withholding Tax. Accessed May 18, 2026.
[13] IRS. S Corporations. Accessed May 18, 2026.
[14] Maryland Comptroller of Maryland. Maryland Income Tax Rates and Brackets (Taxpayer Services Knowledge Base Article KB0010014). Accessed May 18, 2026.
