A Massachusetts S corporation is a corporation formed under state law that has elected federal S status with the IRS, which the Commonwealth then recognizes automatically for state tax purposes.1Massachusetts Department of Revenue. S Corporations Income, losses, and deductions pass through to shareholders, who report them on their personal Massachusetts returns at the 5% rate. The structure usually avoids the double taxation C corporations face, but the state layers on a corporate-level “sting tax” once total receipts cross $6 million, which catches many owners by surprise.
Massachusetts Follows the Federal S Election
There is no separate Massachusetts S election. Once the IRS accepts your Form 2553, the Commonwealth treats the corporation as an S corp under both M.G.L. c. 62 (individual income tax) and c. 63 (corporate excise).2Legal Information Institute. 830 CMR 62.17A.2 – Restatement of Massachusetts Taxation of S Corporations and Their Shareholders One carve-out: security corporations, which exist only to buy, sell, and hold securities for their own account, are taxed under a separate regime and cannot be treated as S corporations in Massachusetts even with a valid federal election.3Mass.gov. 830 CMR 63.38B.1 Massachusetts Taxation of Security Corporations
Who Qualifies and Who Can Own Shares
Because the state defers to the federal rules, you have to meet every Subchapter S requirement. The IRS caps S corporations at 100 shareholders and a single class of stock, and the entity must be a domestic corporation.4Office of the Law Revision Counsel. 26 USC Subchapter S – Tax Treatment of S Corporations and Their Shareholders Shareholders are limited to individuals, certain qualifying trusts, and estates. Partnerships, other corporations, and nonresident aliens cannot hold shares.5Internal Revenue Service. S Corporations A few business types are ineligible regardless of ownership, including insurance companies and domestic international sales corporations.
Any breach, even a one-day lapse, can terminate the election retroactively. Vet any stock transfer carefully before it happens.
Forming the Corporation in Massachusetts
The corporation itself is created by filing Articles of Organization with the Corporations Division of the Secretary of the Commonwealth.6Mass.gov. Starting a Corporation in Massachusetts The Articles must list a corporate name not already in use by another Massachusetts entity, the number of shares the corporation is authorized to issue, and the name and address of a registered agent who can accept legal documents in-state.7Secretary of the Commonwealth of Massachusetts. Domestic Corporation Forms
Every Massachusetts corporation must have at least a president, treasurer, and clerk, and the initial directors and officers are identified at formation. Filing is available online, by fax, in person, or by mail; online is usually fastest. The fee is $275 for up to 275,000 authorized shares, with an added $100 for each additional 100,000 shares.8Secretary of the Commonwealth of Massachusetts. Filing Fees
The state filing creates the corporation. The federal S election is a separate step. Make sure the entity name, EIN, and address match exactly across both filings, because mismatches cause processing problems.
Electing S Status With the IRS
Form 2553 must be filed either during the preceding tax year or on or before the 15th day of the third month of the current tax year. For a calendar-year corporation, that deadline is March 15.9Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination All shareholders must consent.
Miss the deadline and the election normally takes effect the following year. The IRS can grant relief for a late election if there was reasonable cause for the delay. Revenue Procedure 2013-30 allows retroactive elections filed within three years and 75 days of the intended effective date, provided every shareholder reported income on their personal returns as if the election had been in place. Past that window, you need a private letter ruling, which is slower and costlier.
How Massachusetts Taxes the S Corporation
The baseline is clean. Income flows through to each shareholder, who pays Massachusetts personal income tax at 5% on their distributive share.10General Court of Massachusetts. Massachusetts Code Chapter 62 Section 17A – Taxation of Shareholders of S Corporations The corporation itself owes no income-level tax at smaller sizes, which is the point of the structure.
That changes once total receipts reach a threshold. Massachusetts imposes a corporate-level net income tax, often called the “sting tax,” based on the S corporation’s total receipts for the year.1Massachusetts Department of Revenue. S Corporations Total receipts include gross receipts, dividends, interest, royalties, capital gains, and rental income, measured before cost of goods sold.11General Court of Massachusetts. Massachusetts General Laws Chapter 63 Section 32D – S Corporations; Net Income Measure
- Under $6 million in total receipts: no corporate-level income tax. Income flows through to shareholders only.
- $6 million to under $9 million: the corporation owes 2% on its net income at the entity level, on top of what shareholders pay on their distributive shares.1Massachusetts Department of Revenue. S Corporations
- $9 million or more: the corporate-level rate rises to 3% of net income.1Massachusetts Department of Revenue. S Corporations
Larger S corporations therefore face tax at both levels. Owners who project their business across the $6 million line should plan for the entity-level cost well before they get there.
Built-in Gains After a C-to-S Conversion
If your company converted from a C corporation, any appreciation in assets that existed at the time of conversion can trigger a federal built-in gains tax when those assets are sold. Massachusetts taxes that income at the entity level at the rate that would apply to a C corporation.2Legal Information Institute. 830 CMR 62.17A.2 – Restatement of Massachusetts Taxation of S Corporations and Their Shareholders If the S corporation carries accumulated earnings and profits from its C years and more than 25% of gross receipts come from passive investment income, a separate federal tax on excess net passive income also applies.
The 4% Surtax on High-Income Shareholders
Massachusetts voters approved a 4% surtax on taxable income above an inflation-adjusted threshold (roughly $1.08 million for tax year 2025). A shareholder’s distributive share counts toward the threshold, so a strong year at the business can push an owner over the line even if their other income wouldn’t.12Mass.gov. Massachusetts 4% Surtax on Taxable Income The threshold adjusts annually; check the Department of Revenue’s published figure before running projections for the next year.
Paying Yourself: Reasonable Compensation
Distributions to S corporation shareholders are not subject to payroll taxes. Wages are. That gap is where the planning (and the enforcement) happens. If you provide more than minor services to your S corporation, you are an employee, and the corporation must pay you a reasonable salary before taking non-wage distributions.13Internal Revenue Service. S Corporation Compensation and Medical Insurance Issues
Reasonable compensation is judged by your duties, time commitment, experience, and what comparable businesses pay for similar work. If the IRS finds your salary unreasonably low, it can reclassify distributions as wages, which means back employment taxes, penalties, and interest.14Internal Revenue Service. S Corporation Employees, Shareholders and Corporate Officers Wages carry Social Security tax (6.2% from the corporation and 6.2% from the employee, up to the annual wage base), Medicare tax (1.45% each), and federal and state unemployment taxes.
Withholding for Out-of-State Shareholders
If any shareholder lives outside Massachusetts, the S corporation must withhold Massachusetts income tax on that shareholder’s share of Massachusetts-source income. The withholding rate is the Part B rate, currently 5%.15Legal Information Institute. 830 CMR 62B.2.2 – Pass-Through Entity Withholding A few exceptions apply, but the default rule puts the compliance burden on the corporation. Miss the withholding and the state can assess penalties against the entity itself.
Annual Filings and Deadlines
Massachusetts S corporations file Form 355S with the Department of Revenue each year, along with a Schedule S and a Schedule SK-1 for every shareholder.1Massachusetts Department of Revenue. S Corporations Each shareholder uses their SK-1 to complete their personal return.
For calendar-year corporations, Form 355S is due on or before March 15. (For the 2025 tax year filed in 2026, the deadline shifts to March 16 because the 15th falls on a Sunday.) An automatic six-month extension to September 15 is available for corporations that meet the payment requirements.16Mass.gov. Massachusetts DOR Tax Due Dates and Extensions The extension buys time to file, not to pay. Any excise owed is still due by the original deadline.
On the federal side, the S corporation files Form 1120-S and distributes federal Schedule K-1s on the same March timeline.17Internal Revenue Service. About Form 1120-S, U.S. Income Tax Return for an S Corporation Form 7004 grants an automatic six-month federal extension.
Separately, every Massachusetts corporation must file an annual report with the Secretary of the Commonwealth. For-profit corporations file within two and a half months after the close of the fiscal year. The fee is $125 on paper, $100 online.6Mass.gov. Starting a Corporation in Massachusetts Falling behind on annual reports can lead to administrative dissolution, which strips your authority to do business. You also need to keep a registered agent with a physical Massachusetts address on file at all times.
How S Status Ends
An S election ends in one of two ways. Voluntary revocation requires consent from shareholders holding more than half the shares. A revocation filed by the 15th day of the third month of the tax year applies to that whole year; filed later, it takes effect the following year, unless you specify a future effective date.9Office of the Law Revision Counsel. 26 USC 1362 – Election; Revocation; Termination
Involuntary termination happens the day the corporation stops meeting the qualification requirements, such as issuing a second class of stock, exceeding 100 shareholders, or admitting an ineligible shareholder. Mid-year termination produces a split tax year where part of the year is taxed as an S corp and the rest as a C corp. Because Massachusetts follows the federal election, losing federal S status ends the Massachusetts S status at the same time.