Boston is one of the most entrepreneurial cities in the United States. Home to world-class universities, a thriving life sciences and tech ecosystem, and a dense professional services community, the city rewards founders who get their business structure right from the start. Whether you are launching a biotech startup, a restaurant in the South End, a consulting firm in Back Bay, or an e-commerce brand, this guide walks you through every step of starting a business in Boston, Massachusetts.

For a broader look at the local business environment, check out our complete guide to doing business in Boston.

Step 1: Choose Your Business Structure

The first decision is how to legally structure your business. Your choice affects your personal liability, how you pay taxes, and what paperwork you file every year. Three main options exist for most Boston entrepreneurs:

Sole Proprietorship

A sole proprietorship is the default structure if you operate under your own name without formal registration. There is no paperwork or state filing required. The problem: you and the business are legally the same person. If someone sues your business, they are suing you personally. Your home, car, and personal accounts are all at risk. This structure only makes sense for very low-risk, low-revenue freelancers.

Limited Liability Company (LLC)

The LLC is the most popular structure for Boston small business owners. It creates a legal separation between you and the business, protecting your personal assets from business liabilities. Taxes are simple: profits and losses pass through to your personal return. Massachusetts does impose a state income tax (5% flat rate), but the pass-through nature of an LLC keeps the structure clean and efficient.

To form an LLC in Massachusetts, you can use a formation service. Northwest Registered Agent handles the registered agent requirement, files your paperwork with the state, and keeps your personal address off public records. For a more guided legal experience, LegalZoom is a solid alternative with attorney Q&A available. Either way, professional formation reduces errors and saves time.

Corporation (C-Corp or S-Corp)

A corporation is the right choice if you plan to raise venture capital, issue preferred stock to investors, or eventually pursue an IPO. Boston is flush with VC, and many investors prefer or require a Delaware C-Corp structure for investment. If you are building a fundable startup, incorporate as a Delaware C-Corp with a Massachusetts foreign registration. If you are building a profitable lifestyle business, an LLC is simpler and more tax-efficient.

Step 2: Name Your Business

Your business name must be distinguishable from other registered entities in Massachusetts. Here is how to lock it in:

Search Name Availability

Check name availability through the Massachusetts Secretary of the Commonwealth’s Corporations Online portal. If your name is taken, you need to choose something different before filing.

DBA (Doing Business As) in Suffolk County

If you operate under a trade name different from your legal entity name, file a DBA certificate with the Suffolk County Registry of Deeds. For example, if your LLC is “Smith Ventures LLC” but you operate as “Boston Clean Pros,” you file a DBA for the operating name.

Trademark Considerations

Registering in Massachusetts protects your name at the state level, but not nationally. If your brand has long-term value or national expansion plans, file a federal trademark through the USPTO. This is especially important in Boston’s competitive startup market where brand equity matters from day one.

Step 3: Register with the Massachusetts Secretary of the Commonwealth

File your formation documents through Massachusetts Corporations Online.

What to File

LLCs file a Certificate of Organization. Corporations file Articles of Organization. The LLC filing fee is $500; the corporation fee is $275. Processing takes 7-10 business days for standard; 24-hour expedited service is available for an additional fee.

Registered Agent Requirement

Every Massachusetts business entity must designate a registered agent with a physical Massachusetts address available during business hours. Northwest Registered Agent provides this service, keeps your personal address private, and forwards legal documents promptly.

Step 4: Get Your EIN

An Employer Identification Number is a nine-digit tax ID from the IRS. You need it to open a business bank account, hire employees, file business taxes, and work with most vendors and clients. Applying is free through the IRS online EIN application. Takes about 10 minutes; EIN is issued immediately.

Step 5: Open a Business Bank Account

Open a dedicated business checking account the moment your LLC is formed and your EIN is in hand. Mixing personal and business funds is a primary way courts justify “piercing the corporate veil” and eliminating your LLC’s liability protection.

Boston-Specific Banking Options

• Eastern Bank: New England’s largest independent bank with strong small business programs and a community banking ethos. Multiple Boston branches.
• Rockland Trust: Massachusetts-based community bank with excellent business banking products and local relationship banking.
• Cambridge Savings Bank: Strong option for Cambridge and Greater Boston businesses, with competitive business checking and lending products.
• Needham Bank: Highly rated community bank serving small and mid-sized businesses across Greater Boston.

See our full guide to the best credit unions and local banks in Boston for business owners.

Step 6: Register for Massachusetts Taxes

Register with the Massachusetts Department of Revenue (DOR):

• Sales Tax: If you sell taxable goods or services, register for a Massachusetts Sales Tax Permit. The rate is 6.25% on most taxable sales.
• Withholding Tax: If you hire employees, register for Massachusetts Withholding Tax through MassTaxConnect.
• Corporate Excise Tax: Massachusetts LLCs pay an annual minimum excise tax of $456. Corporations pay corporate excise tax based on income and net worth.

Step 7: Get Your Boston Business Licenses and Permits

The City of Boston’s Inspectional Services Department (ISD) handles most business permits and licenses. Key permits include:

• Certificate of Occupancy: Required for any commercial space you occupy in Boston.
• Food Establishment Permit: Required for any food service business; involves health inspection approval.
• Sign Permit: Required for any exterior business signage.
• Building Permit: Required for any construction, renovation, or significant alteration to a commercial space.

Use the Boston Permitting Portal to identify what you need based on your business type and location.

Step 8: Get Business Insurance

Massachusetts requires all employers to carry workers’ compensation insurance. Beyond that, carry general liability insurance before opening. Professional liability (E&O) insurance is essential for consultants, lawyers, and service professionals. Compare quotes from multiple carriers before purchasing.

Step 9: Set Up Your Online Presence

Secure a domain name, build a basic website, and immediately claim your Google Business Profile. A verified Google Business Profile drives local Boston search visibility and customer discovery, especially critical for neighborhood-serving businesses.

Step 10: Work with a Boston Business Lawyer

Massachusetts has several nuances in business law that make local legal counsel valuable: the state has its own LLC act provisions, commercial lease protections, and non-compete restrictions (Massachusetts significantly limits non-compete agreements). Before signing any commercial lease, partnership agreement, or investment document, have a Boston business lawyer review it.

Boston Entrepreneurship Resources

• SCORE Boston: Free mentorship from experienced business owners and executives. Offers workshops and one-on-one advising for Boston entrepreneurs.
• Boston SBDC: The Small Business Development Center at UMass Boston provides no-cost advising and business plan assistance.
• MassChallenge: Zero-equity accelerator at the Seaport offering mentorship, network access, and grants for qualifying startups.
• City of Boston Small Business Development: The City offers technical assistance, workshops, and periodic grant programs through its Office of Small Business Development.

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