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Who we are...

Founded in 1987, Melnick, Lilienfeld & Castonguay, LLC provides a wide range of business and personal accounting, tax and consulting services throughout South Florida and beyond from our office in Sunrise, Florida. We represent people across the country in their state and federal tax filing.

It’s no accident that the majority of our clients have been with us for many years. Their complete satisfaction is our overriding goal. We keep clients satisfied by really getting to know them and their needs, by crafting imaginative solutions, by working around the clock if urgent situations demand, and by pro-actively anticipating needs and ways to provide comfort.

Financial Consultation

Our Specialties

What We Focus On


Accounting & Consulting Means More Than Running Numbers. It presents a portrait of your business health and insight into its future.  Painting the financial portrait requires knowledge of law and its applications, as well as counsel regarding strategy and the financial consequences of decisions. At Melnick, Lilienfeld, Castonguay, LLC, our success has been built on helping collect and the timely, accurate use of financial information, then responding quickly to market changes, trends and alterations in your operation.

We understand the business marketplace. Our services range from tax, business and real estate consulting to estate, corporate and individual planning. We take advantage of advanced technology to enhance efficiency and thus profitability. We have particular strength in IRS representation—win-win resolution of tax-related disputes.

Tax Planning and Return Preparation

  • Corporations and partnerships

  • Estates Trusts and Individuals

  • Non-resident returns

  • Business Tax Preparation

  • Business tax planning

Making Notes

Other Tax Strategies Focused on Your Needs

  • Corporate reorganization

  • Deferred compensation

  • Estate and trust administration including family mediation

  • Personal tax planning

  • State and local tax issues

Documents and Blurred Business Men

Positioning Your Business For Success

  • Banking relations and financial strategies

  • Cash flow projections and budgeting

  • Real estate consulting and investment strategies

  • Strategic planning to start or restructure your business

Discussing the Numbers
  • Cash flow analysis

  • Computer services and systems review and designs

  • Employee vs. contractor disputes

  • Financing issues

  • Growth strategies

  • Mediation

  • Sales tax payment

  • Shareholder disputes

  • Wage and hour decision-making

  • Your Voice with the IRS

  • Appeal of proposed assessments and penalties

  • Delinquent tax return filing and processing

  • Employment tax examinations

  • Examination of tax returns

  • IRS notices

  • Negotiation of installment payment agreements

  • Offers in compromise

  • Release of levies and liens

Continuing Counsel to Make Your Business Succeed

Susan Castonguay, CPA

Suzi joined the firm in 1989, and became partner in 2009, Upon Mr. Melnick’s retirement in 2011, she became the managing partner of the firm. Suzi has extensive experience in tax preparation, including personal, corporate, trust, estate and gift. She has also consulted with clients on structuring transactions for the most favorable tax outcome. She has represented numerous clients in IRS tax audits and State of Florida sales tax, property tax and payroll tax audits. Suzi’s focus is on the taxation of closely held businesses in various industries including real estate, investments, manufacturing and high net-worth individuals.

Suzi has been a CPA in Florida since 1991, and  received her bachelors in Accounting from Florida State University. 


Marisa A. Margulies

Marisa Margulies graduated from the University of Miami’s School of Business Administration in 1999. As a 20 year veteran of the Firm, Marisa has worked in every one of MLC’s departments, until eventually becoming Partner.

As an IRS Enrolled Agent, she has technical tax experience in the preparation of Individual, Corporate, Partnership & Fiduciary Tax Returns, as well as handling issues involving taxable gifts and the preparation of Estate Tax Returns. In addition to tax preparation, she also handles Client IRS Representation, State of Florida Sales & Payroll Tax Compliance Issues, QuickBooks Training, and Business Consulting.

Marisa is truly a seasoned professional who approaches each situation with integrity, honesty and efficiency.

Info. & News

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toll free: 800-937-1040

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fax: 305-935-2041

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1551 Sawgrass Corporate Parkway

Suite 100 | Sunrise, Florida  33323 

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