Comprehensive Accounting & Bookkeeping Services in Maine


Expert Accounting Services for Businesses & Individuals in Brunswick, Portland, Augusta, and South Portland

Your One-Stop Accounting Solution


At Clarkson and Clarkson Inc., we understand that navigating the complexities of accounting, bookkeeping, and taxation can be a significant challenge for businesses and individuals alike. Our philosophy centers on empowering you with financial clarity, strategic insights, and peace of mind. As a dedicated division of The Clarkson Corporation, we proudly offer a full spectrum of integrated accounting, meticulous bookkeeping, and proactive tax services designed for the diverse needs of clients across Brunswick, Portland, Augusta, South Portland, and the greater Maine region.


Whether you’re a startup in Portland, a small business in Brunswick, an entrepreneur juggling multiple ventures, or an individual seeking reliable tax assistance in Augusta, our seasoned team is here to provide unparalleled expertise, unwavering transparency, and personalized attention. From setting up your QuickBooks system for optimal efficiency to expertly handling complex tax preparation, we ensure you always have a trusted financial partner by your side.

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Annual October “Catch-Up” Accounting Service

Turn financial chaos into clarity before year-end.



  • Organize and reconcile your records for the entire year
  • Correct errors and fill gaps
  • Prepare audit-ready financial statements
  • Ensure stress-free tax season readiness


This service is perfect for busy entrepreneurs, small business owners, and individuals who want to start the new fiscal year with clean, accurate, and actionable financial records.  Due to the HIGH DEMAND FOR THIS SERVICE, you will need to sign up by August 1st of each year.

Our Comprehensive Suite of Financial Services


Clarkson and Clarkson Inc. is your one-stop solution for all your accounting and financial management needs. We offer a tailored array of services designed to simplify your financial life, ensure compliance, and empower your growth.

Accountant setting up quickbooks advisor for client in Maine

Transform your books from a burden into a strategic asset.


  • QuickBooks Professional Advisor Services: As certified QuickBooks ProAdvisors, we provide customized onboarding, setup, and optimization—tailoring your chart of accounts, invoicing, and reporting to your business needs.
  • Reviewing your use of QuickBooks to determine maximum use of your current QuickBooks system
  • QuickBooks Clean-Up: We reconcile accounts, correct errors, and bring your records up to date, no matter how messy they may seem.
  • Ongoing Monthly Bookkeeping: Accurate, timely, and reliable monthly bookkeeping—including data entry, bank and credit card reconciliations, accounts payable/receivable, and more. You’ll receive precise financial statements and reporting every month, freeing you to focus on your business.

Our ongoing support means you never have to face your finances alone. We’re just a call or email away, ready to answer questions and keep your business running smoothly.


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tax form registration in Maine

Tax season doesn’t have to be stressful.

Individual Tax Returns: We expertly prepare and file all federal and Maine state returns, maximizing deductions and minimizing your tax liability.


  • Business Tax Returns: For sole proprietors, partnerships, S-corps, C-corps, and LLCs—including multi-state and complex returns.
  • Proactive Tax Planning: Year-round strategies to help you anticipate changes, optimize decisions, and avoid surprises at year-end.

We stay current on the latest tax laws and regulations so you don’t have to. Our dedicated approach means your taxes are handled accurately, efficiently, and with a keen eye on your financial well-being.


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Payroll compliance support for Maine businesses

Stay compliant and save time with our expert support.


  • Payroll Services: Accurate, on-time payroll processing, tax withholdings,other deductions, direct deposits, and year-end reporting (W-2s, 1099s).
  • Sales Tax Compliance: Registration, calculations, timely filings, and payments for Maine and other states.
  • GAAP Compliance: Preparation of financial statements that meet Generally Accepted Accounting Principles for audits, investors, and lenders.

With Clarkson and Clarkson Inc. managing these critical compliance tasks, you can focus on strategic initiatives and business growth.


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 Accountant managing accounts for their client

Make smarter decisions with expert insights.


  • Budgeting & Forecasting: Develop realistic budgets and robust financial forecasts.
  • Financial Analysis: Pinpoint strengths, weaknesses, and opportunities.
  • Business Consulting: Guidance on entity selection, expansion, financial strategy, and operational efficiency.

With us, you receive more than just accounting; you gain a dedicated partner committed to your financial health and growth.


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Why Choose Clarkson and Clarkson Inc.?

  • Certified Professionals with Local Expertise: Our access to CPAs and QuickBooks ProAdvisors provide years of experience serving Maine’s business landscape.
  • Flat-Fee, Transparent Packages: Know exactly what you’ll pay—no hidden costs or surprises.
  • Personalized Service & Direct Access: Every client receives direct, responsive access to our accounting staff , for rapid support.
  • Audit-Ready Results: We deliver meticulous, audit-ready records—giving you peace of mind.
  • Holistic Financial Solution: As a division of The Clarkson Corporation, we’re expanding to offer even more financial and advisory services.
  • Community Commitment: We’re deeply invested in the success of Maine’s businesses and families, supporting local events and economic growth.

Who We Serve


  • Medium -sized Businesses, Small Businesses & Startups: From retail to tech, we help you stay organized and compliant.
  • Entrepreneurs & Freelancers: Simplify your finances and focus on growth.
  • Nonprofits: Specialized support for nonprofit accounting and compliance.
  • Individuals & Families: Reliable tax preparation and planning for every stage of life.

Proudly Serving Maine’s Leading Communities


Based in Brunswick, we’re proud to serve clients in Portland, South Portland, Augusta, and beyond. Our local presence allows us to offer timely, relevant, and highly personalized accounting and bookkeeping services. See all service areas.

Frequently Asked Questions (FAQ)

  • Do you offer remote/virtual services?

    Yes! We serve clients throughout Maine both in-person and virtually.

  • Can you help with messy or outdated books?

    Absolutely—our QuickBooks clean-up and October “Catch-Up” services are designed for this. Due to the HIGH DEMAND FOR THIS SERVICE, you will need to sign up prior to August 1st of each year.

  • How do your flat-fee packages work?

    After a free consultation, we’ll recommend a transparent monthly or annual package with no hidden fees.

  • Are you accepting new clients?

    Yes! Schedule your free consultation today.