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Marcum LLP
Marcum LLP

Diane Giordano CPA*

Partner - Tax & Business
Three Men Standing
10 Melville Park Road
Melville, NY 11747

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*Licensed by the State of New York

Diane Giordano is a Tax & Business Services Partner in the Firm's Melville office and is the Firm-wide Credit and Incentive Program Industry Leader. She works closely with large, multi-state companies as well as family-owned businesses, providing tax consulting, financial statement disclosure and compliance services. Ms. Giordano's clients also include SEC reporting entities for which she provides ASC 740 services.

Ms. Giordano has more than 25 years of accounting and tax experience. She frequently speaks to professional and industry organizations on a variety of tax topics and has authored numerous articles that have been published in various professional publications. Additionally, she serves as the editor of the Firm's tax newsletter, Beyond the Numbers and the annual Marcum Year-end Tax Guide; and also is the Firm-wide tax training coordinator.

Prior to joining Marcum in 2005, Ms. Giordano spent 11 years at a global accounting organization and, previously, six years at a "Big 4" firm. Earlier in her career, she was an internal auditor at a large regional bank.

Professional & Civic Affiliations
  • Mentoring Partnership of Long Island, Advisory Board
  • Girls, Inc. of Long Island, Board Member
  • Attorney/Accountant Networking Group (AANG)
  • Moxxie Network
  • A Wing and A Prayer, Volunteer
  • American Heart Association, LI chapter, Past Board Member
  • March of Dimes, Past Board Member
  • American Institute of Certified Public Accountants (AICPA)
  • New York State Society of Certified Public Accountants (NYSSCPA)
Articles, Seminars & Presentations
  • Newsday Tax Panel, 2012
  • Daily News Tax Panel, 2011
  • Year-End Tax Update, NYSSCPA Nassau Chapter, 2009-2012
    • Executive Compensation
    • FAS 109
    • Section 382
    • Section 338
    • Golden Parachute Plans
    • Research and Development and Other Tax Credits

Practice Focus

Service Industries
Closely-Held Businesses
SEC Reporting Entities


Certified Financial Planner
College for Financial Planning

Master of Science, Taxation
C.W. Post Campus Long Island University

Bachelor of Science, Accounting
Hofstra University

Awards & Recognition

Long Island Power Women In Business, Queens Courier, 2015
Top 50 Most Influential Women in Business, Long Island Business News, 2013 & 2011
Who's Who in Women in Professional Services, Long Island Business News, 2010
Distinguished Service Award, NYSSCPA, 2009

Related Insights & News

Tax Partners Diane Giordano and Brett McGrath co-authored an article for the Hartford Business Journal, about how start-up companies can benefit from the new Research & Development Credit Payroll Tax Offset.


The new payroll tax offset, effective as of 2016, allows companies to receive a benefit for research activities regardless of profitability.

Newsday quoted Tax Partner Diane Giordano in a column advising small businesses to take advantage of tax credits in 2016, before they are changed or eliminated under tax reform


Diane Giordano, a tax partner at Marcum LLP in Melville, thinks Section 179 won't face the chopping block due to its popularity and the fact ....

New Businesses or Start-Ups: Get Ready for the New Research and Development Credit Payroll Tax Offset


The passing of the Protecting Americans from Tax Hike (PATH) Act of 2015 introduced many exciting changes related to the Research and Development (R&D) Tax ....

Tax Partner Diane Giordano discussed travel and entertainment expense reporting with Long Island Business News.


As a steady surge of business trips are being logged across the country, business owners should review their travel and entertainment policies. Accountants advise taking ....

Newsday quotes Tax & Business Services Partner Diane Giordano in an article about the deductibility of corporate donations.


For many companies, year-end is prime time for charitable giving… Keep in mind, though, there are different rules for different corporate structures, says Diane Giordano, ....

Tax & Business Services Partner Diane Giordano Quoted by the New York Times


Corporations continue to use big civil legal settlements with federal regulators as a way to deduct billions of dollars from their American tax bills, largely ....

Diane Giordano, Tax & Business Services Partner, Quoted in Long Island Business News Article, "Blinded by Science."


Diane Giordano, a partner at Marcum in Melville, has seen a cross-section of companies qualify for credits. A recycler extracting precious metals from computers, a ....

Frequently Asked Questions Regarding the New Tangible Property Regulations: Why Do I Need to File Form 3115?


The new Tangible Property Regulations are the most dramatic changes in tax law to affect for profit businesses since the changes to the Internal Revenue ....

Diane Giordano, Tax & Business Services Partner, Quoted in Long Island Business News Article, "Start-Up NY Stalls on LI"


Television ads for Start-Up NY, New York State's small-business incentive program, portray a government eager to suspend taxes for new business as an investment in ....

S Corporations in NYS: Planning For Changes to the NYS 2014/2015 Budget


The 2014/2015 NYS Budget was signed by Governor Cuomo and became effective on April 1, 2014. The Budget includes many provisions effecting NYS companies such ....

Reminder to Taxpayers to Beware of Scams!

Now that we are in the midst of a busy tax season, Marcum LLP would like to remind all readers to beware of callers demanding ....

Diane Giordano, Tax & Business Services Partner, Honored by the Long Island Business News for Her Personal, Business and Community Achievements


Launched in 2000, the Top 50 program recognizes the Island’s top women professionals in business, education, government and the not-for-profit fields for their business acumen, ....

Diane Giordano, Tax & Business Services Partner, Quoted in Long Island Business News Article "CPAs Plan for Fiscal Cliff"


With Election 2012 behind us and the so-called "fiscal cliff" dead ahead, accountants across the country are preparing individual and corporate clients for an economic ....

Diane Giordano, Tax & Business Partner, Provides Tax Advice and Works the Phones for the New York Daily News' Annual Tax Hotline


Seeking help as the tax deadline approaches, New Yorkers flooded the Daily News Tax Hotline again Wednesday.

Diane Giordano, Tax & Business Partner, Featured in Who's Who in Women in Professional Services and Senior Living


Diane Giordano, CPA, is a tax partner in Marcum LLP’s Melville office. Giordano works closely with large, multi-state companies as well as family-owned businesses providing ....




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