Mackay, Caswell & Callahan, P. C.

Mackay, Caswell & Callahan, P. C.
212-281-6781 (voice)
10 East 39th Street
Suite 901
New York NY 10016
United States
ZIP Code
Short Profile
Representing clients on complex tax matters


Straight Talk ~ Effective Solutions

Since 1961, the New York tax attorney firm of Mackay, Caswell & Callahan, P.C. has represented clients with respect to IRS & NYS tax audits, collection actions and other complex tax matters.


New York City tax and business attorney Joseph M. Callahan, Esq. can help you with the IRS New York State department of Taxation and Finance, and represent you with respect to your individual and business tax matters.

Joe Callahan is a member of the New York State Bar Association and is the Managing Attorney of Mackay, Caswell & Callahan, P.C. He is a New York City tax and business attorney and a Certified Public Accountant, and was licensed by the State of Maryland.

Joe earned his B.S. in Public Relations in 1981 and a joint M.S. in Accounting and Juris Doctorate in 1986, all from Syracuse University. Joe began his career in tax as a State & Local Tax Consultant for Deloitte in Manhattan. Joe’s busy formative years are now combined with over 30 years’ experience representing people with tax matters and make him well-qualified to assess the complexities of your tax matters.


Taxation, and the laws governing it, are complex, and you don’t want to accidentally commit tax fraud, or otherwise compromise your personal or financial well-being. Whatever your tax problem, NYC attorney Joe Callahan is well versed in many types of complicated tax matters including but not limited to:

Foreign Bank and Financial Accounts (FBAR) disclosures

Offshore Voluntary Disclosure Program (OVDP)

Offers in Compromise

Installment Payment Arrangements

Tax Fraud

Tax Evasion

Audits and Tax Investigations

Commercial Asset Purchases and Sales

Commercial Loan Transactions

Business/Corporation formations

Limited Liability Companies and Partnerships


Mackay, Caswell & Callahan, P. C. is a professional corporation of tax attorneys in NYC, and throughout much of New York State, focused on IRS and New York tax controversies. Attorney Joe Callahan leads Mackay, Caswell & Callahan and brings a high level of diverse tax experience to bear on behalf of their clients.

Founded in 1961, they are New York tax attorneys with a well-established reputation with the New York State, New York City and IRS tax communities and offer a comprehensive understanding of the internal workings of governmental tax agencies. They confidentially navigate tax agency procedures and avail their clients of all administrative and judicial remedies.

The New York tax attorneys at Mackay, Caswell & Callahan handle all aspects of tax controversies with the IRS, New York State and New York City including audit representation, collection defense, civil tax litigation, and criminal tax defense. They are committed to achieving the best results for their clients as efficiently as possible, with straight talk and effective solutions.

Their business law practice offers counsel to public and private companies, lenders and financial institutions, business owners and shareholders.


Breach of contract

Selling businesses

Buying businesses

Probate services

Powers of attorney

Health care proxies

Business formation

Criminal tax investigations

Audits and collections

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