Best Accounting Firms in Boston

Finding the right accounting firm in Boston can transform how your business handles everything from daily bookkeeping to complex multi-state sales tax compliance. With Boston’s economy driven by biotech, healthcare, tech startups, higher education, and financial services, the accounting landscape has evolved to serve diverse business needs—from Fortune 500 subsidiaries to early-stage startups in the Seaport Innovation District.

The right firm should understand your industry’s specific requirements, whether that’s R&D tax credits for biotech, SaaS taxability complexities, or wholesale exemption handling for e-commerce brands. This guide covers 15 verified accounting firms serving the Greater Boston area, organized by size and specialization to help you find the best fit for your business stage and needs.

Key takeaways

• Wolf & Company, P.C. – Top 100 US firm headquartered in Boston since 1911, specializing in tech startups, financial institutions, and healthcare with global reach through Allinial Global network
• Gray, Gray & Gray, LLP – One of few remaining independent Massachusetts firms (18th largest in the state), offering personalized service without corporate oversight from national conglomerates
• Baker Newman Noyes – Ranked 23rd largest in Massachusetts, with deep M&A and healthcare advisory expertise
• Tristan CPA – Boutique firm for outsourced accounting tailored to startups
• Mighty Financial – Boston-based outsourced accounting and finance firm serving small and medium-sized businesses, including startups and professional services organizations, with strong startup and recurring-revenue expertise
• RSM, Grant Thornton, CBIZ – National firms with Boston offices offering enterprise-level assurance, tax, and consulting for middle market and large businesses

Before evaluating accounting firms, Boston businesses must assess their sales tax nexus situation. Massachusetts follows destination-based sourcing rules, meaning you collect sales tax based on where your customer receives the product—not where you ship from. But the complexity multiplies when you sell across state lines.

1. Wolf & Company, P.C.

Wolf & Company has served Boston businesses for over a century, positioning itself at the center of the city’s innovation economy. Headquartered at 255 State Street in the Financial District, the firm ranks among the top 100 largest US accounting firms and specializes in the industries that define Boston’s business landscape.

Core specializations

• Tech startups and innovation companies – Deep expertise in Boston’s startup ecosystem, including venture-backed growth companies and established technology firms
• Financial institutions and investment management – Specialized audit and advisory services for banks, credit unions, and asset managers
• Healthcare and nonprofit organizations – Compliance-focused services for hospitals, health systems, and tax-exempt entities

Why Boston businesses choose Wolf

Wolf’s membership in the Allinial Global network provides clients with international reach while maintaining local relationships. Principal Jeffrey Marsico and Principal William J. Nowik lead teams that understand both regulatory requirements and growth-stage business challenges. The firm also maintains a Springfield, MA office at 1500 Main Street for Western Massachusetts clients.

Contact

(617) 439-9700 | info@wolfandco.com

Best for

Tech startups, financial services, healthcare organizations, and nonprofits seeking top-tier regional expertise with national firm capabilities

2. Gray, Gray & Gray, LLP

Gray, Gray & Gray stands out as one of the few remaining independent accounting firms in Massachusetts—a distinction that matters for businesses seeking personalized attention without corporate bureaucracy. Ranked the 18th largest accounting firm in Massachusetts by Boston Business Journal, the firm has accumulated recognition across multiple industry rankings.

Independence advantage

Unlike many regional firms acquired by national conglomerates, Gray, Gray & Gray answers directly to clients rather than corporate offices. This structure enables faster decision-making and customized service approaches that larger organizations often cannot match. Their membership in CPAmerica Inc. provides access to national resources while preserving local autonomy.

Contact

(781) 407-0300 | info@gggllp.com

Best for

Mid-market businesses valuing independence, private wealth clients, and companies seeking audit and tax services with a personal touch

3. Baker Newman Noyes

Baker Newman Noyes (BNN) has built strong client relationships throughout New England. Ranked 23rd largest accounting firm in Massachusetts by Boston Business Journal, BNN operates as a US Top 100-ranked firm with offices throughout New England.

Service capabilities

• Tax, assurance, and advisory services – Full compliance and strategic tax planning
• Business advisory – Operational consulting for growth-stage companies
• Healthcare advisory – Specialized services for medical practices and health systems
• Mergers and acquisitions – Transaction support including due diligence and integration planning

Regional footprint

BNN’s Boston office at 10 Post Office Square connects to additional locations in Portland ME, Woburn MA, Manchester NH, and Portsmouth NH. This New England coverage helps businesses with multi-state operations coordinate accounting across locations. The firm offers international reach through its network affiliations, but the specific network branding on BNN’s current web properties appears inconsistent, so it’s safer not to name one definitively here.

Contact

(617) 556-3900 | Toll-free: (800) 244-7444

Best for

Healthcare organizations, M&A-active companies, and businesses prioritizing client service excellence

4. RSM US LLP

RSM brings national firm resources to Boston’s middle market—businesses responsible for roughly one-third of US employment. Their office at 80 City Square in Charlestown serves companies that have outgrown boutique firms but don’t require Big 4 scale.

Middle market focus

RSM specifically targets businesses in the growth phase between startup and enterprise. This focus means their teams understand the challenges of scaling operations, implementing new systems, and managing the compliance complexity that comes with rapid growth. For Boston businesses expanding nationally, RSM’s presence across major US markets provides consistent service as your footprint grows.

Service areas

• Assurance services – Financial statement audits, reviews, and compilations
• Tax services – Corporate, partnership, individual, and international tax
• Consulting – Technology, risk, and transaction advisory

Contact

(617) 912-9000

Best for

Middle market companies seeking national firm capabilities with specialized attention, particularly those expanding beyond Massachusetts

5. Grant Thornton

Grant Thornton’s Boston office at 53 State Street serves large enterprises and middle market companies requiring sophisticated advisory services. As one of the largest accounting networks globally, Grant Thornton provides audit, tax, and advisory services with international coordination when needed.

Advisory depth

Grant Thornton’s strength lies in complex advisory engagements—restructuring, forensic accounting, transaction advisory, and risk management. Boston businesses facing significant transactions or operational challenges benefit from teams experienced in high-stakes situations.

Contact

(617) 723-7900

Best for

Large enterprises, companies in complex transactions, and businesses requiring forensic or restructuring services

6. CBIZ

CBIZ offers more than traditional accounting, combining tax and advisory services with benefits administration, insurance, and technology consulting. Their Boston office earned Best Places to Work recognition, indicating strong internal culture that often translates to better client service.

Integrated services

• Accounting and tax – Traditional compliance and planning
• Benefits administration – Employee benefits design and management
• Insurance services – Property, casualty, and risk management
• Technology consulting – Systems implementation and optimization

This multi-service model benefits businesses seeking to consolidate vendors. Rather than managing separate relationships for accounting, insurance, and benefits, CBIZ clients access coordinated services through a single firm.

Contact

(617) 807-5000

Best for

Businesses seeking consolidated professional services, companies prioritizing employee benefits and insurance alongside accounting

7. KLR (Kahn, Litwin, Renza)

KLR recently relocated their Boston office to 115 Federal Street, Suite 801, signaling commitment to the Boston market. With additional offices in Andover MA, Providence RI, Newport RI, and Bradenton FL—plus international capabilities—KLR serves businesses requiring regional presence with broader reach.

Technology integration

KLR emphasizes technology in their service delivery, helping clients implement modern accounting systems and leverage automation for efficiency. This focus aligns well with Boston’s tech-forward business community.

Contact

(888) KLR-8557

Best for

Businesses seeking regional firm attention with technology-forward service delivery

8. EisnerAmper

EisnerAmper’s Boston office represents a national firm with 440+ partners and 4,500+ professionals serving clients from startups to global public companies. Their alternative practice structure separates attest services (EisnerAmper LLP) from tax and consulting (Eisner Advisory Group LLC).

Industry coverage

• Biotech and life sciences – Deep expertise in Boston’s dominant industry
• Healthcare – Providers, payers, and health tech companies
• Technology – Software, SaaS, and emerging tech
• Government and nonprofit – Public sector and tax-exempt organizations

For SaaS companies in Boston, EisnerAmper understands the complexities of software taxability that varies dramatically by state. However, managing actual compliance across dozens of states often requires specialized sales tax support beyond what even large accounting firms provide in-house.

Best for

Biotech, healthcare, and technology companies seeking national firm resources with industry specialization

9. AAFCPAs

AAFCPAs operates as a premier CPA and consulting firm based in New England, serving commercial companies, nonprofit organizations, and wealthy individuals. The firm balances regional presence with substantial resources.

Best for

Nonprofits, commercial companies, and high-net-worth individuals seeking New England-based expertise

10. PKF O’Connor Davies

PKF O’Connor Davies maintains Boston offices at 155 Federal Street with additional presence in Quincy.

Regional office of national network

As part of the PKF O’Connor Davies network, the Boston office accesses resources across the broader organization while maintaining local focus. This structure benefits businesses needing coordination across multiple Northeast locations.

Contact

Address: 155 Federal Street, Suite 200, Boston, MA 02110

Best for

Businesses seeking established regional presence with network resources

11. BerryDunn

BerryDunn ranks among the Top 50 US accounting firms and holds the distinction of being the largest firm headquartered in New England. They serve clients across 30+ industries, providing audit, tax, and outsourced accounting services.

Best for

Businesses seeking the largest New England-headquartered firm with broad industry coverage

12. Tristan CPA

Tristan CPA earns strong client reviews praising personalized service and practical guidance. Located at 24 School Street in downtown Boston, this boutique firm specifically targets startups and small businesses in Greater Boston.

Client testimonials

Reviews from clients like Kevin Lau, Peter Ho, and Sweat Fixx Studio highlight the firm’s ability to deliver big-firm expertise with personalized solutions. This combination matters for startups needing sophisticated guidance.

Services offered

• Outsourced accounting and bookkeeping – Monthly financial management
• QuickBooks review and guidance – System optimization and training
• Payroll services – Full payroll management
• Tax preparation – Individual and business returns
• Cloud documentation – Modern, paperless processing

Contact

(617) 977-4807

Best for

Startups and small businesses seeking high-touch service

13. Mighty Financial

Mighty Financial dedicates its practice exclusively to early-stage technology startups with recurring revenue models. This focus makes them particularly relevant for Boston’s venture-backed startup ecosystem.

Notable clients

• Zakipoint Health
• Julia Computing
• Dive Technologies
• AaDya

Startup-specific expertise

Mighty Financial understands the financial rhythms of venture-backed companies—runway management, investor reporting, and the metrics that matter for fundraising. Their exclusive focus on startups means teams speak the language of burn rate, ARR, and customer acquisition costs fluently.

Best for

Early-stage technology startups, particularly those with recurring revenue models

When accounting firms aren’t enough for sales tax

Most Boston accounting firms handle general bookkeeping, tax returns, and audit preparation competently. However, e-commerce businesses selling across state lines face sales tax complexity that exceeds what traditional accounting firms typically manage in-house.

The multi-state challenge

Accounting firms generally don’t maintain:

• Real-time tax rate databases across 13,000+ US jurisdictions
• Automated filing systems for dozens of state returns monthly
• Proactive nexus monitoring to alert you before threshold breaches
• Notice management infrastructure to resolve state communications quickly

For businesses with multi-state sales tax obligations, the practical solution often combines a local accounting firm for financial statements and business tax returns with a dedicated sales tax partner like Zamp for compliance across jurisdictions. This division of labor lets your accountant focus on their expertise while specialists handle the registration, calculation, filing, and notice resolution that sales tax demands.

Zamp works alongside accounting firms—either managing compliance entirely or supporting in-house teams with real-time rooftop-accurate rates, automated filings, and audit support. For startups to $300M+ companies, this partnership model addresses sales tax without burdening your accounting relationship.

Frequently Asked Questions

What is sales tax nexus, and how does it apply to my Boston-based business?

Sales tax nexus refers to the connection between your business and a state that triggers an obligation to collect and remit sales tax. For Boston businesses, you automatically have nexus in Massachusetts. However, selling to customers in other states, storing inventory in fulfillment centers like Amazon FBA, or employing remote workers can create nexus in additional states.

How do I choose the right accounting firm in Boston for specialized sales tax needs?

First, assess whether your sales tax needs are primarily Massachusetts-focused or multi-state. For Massachusetts-only compliance, most established Boston accounting firms handle this adequately. For multi-state obligations, ask potential firms specifically about their sales tax capabilities: Do they maintain nexus studies? Can they handle registrations in multiple states? Do they file returns across jurisdictions? Many accounting firms partner with specialized sales tax providers rather than building this infrastructure internally.

What are the benefits of using a fully managed sales tax service over DIY software?

DIY software provides tools but places all liability on your company. If the software calculates incorrectly, you face the penalties and interest. Fully managed services like Zamp take on or share that liability—meaning if errors occur, the provider covers penalties. Additionally, managed services handle registrations, filings, and notices proactively rather than requiring your team to interpret software output and take action.

Can a Boston accounting firm help with global VAT and GST?

Larger firms like EisnerAmper, RSM, and Grant Thornton maintain international networks that can coordinate VAT and GST compliance across countries. However, the complexity of managing compliance across 70+ countries often requires specialized platforms. Zamp’s global tier handles VAT/GST calculations, international thresholds, and multi-country filing alongside US compliance for businesses expanding internationally.

What should I look for in an accounting firm’s pricing structure for sales tax services?

Beware of per-filing or per-transaction fees that escalate unpredictably as your business grows. The most transparent pricing models offer all-inclusive monthly fees scoped to your actual business footprint—not variable costs that spike during high-volume months. Ask firms for a detailed breakdown of what’s included versus what triggers additional charges, particularly for state registrations, amended returns, and notice resolution.