Naperville Accountants and Business Consultants

Individual & Business Tax Preparation, Bookkeeping Service, and Consulting

Welcome to Lee Mandel & Associates

We are a full service accounting practice specializing in business and individual tax services, small business consulting, Quickbooks support and preparation, and financial statement preparation and analysis.


Tax Services

When it comes to tax services, Lee Mandel & Associates offers you the best of both worlds: with the experience of veteran tax experts and commitment to a personal investment in your corner.

Accounting & Bookkeeping

As a small business owner, you have more important things to do than to keep your own books. Our Bookkeeping Service will take care of your books for you, so you can get back to the job of running your business and generating profits!

Business Consulting

Lee Mandel & Associates is composed of experienced experts from across the business world. With an eye for personal success and a focus on delivering tailor-made solutions.

QuickBooks Certified ProAdvisor - QuickBooks Online Certification

Put Lee Mandel & Associates in Your Corner

For more than 20 years Lee Mandel & Associates have been providing clients with world-class tax and business consulting. There are thousands of tax consultants out there who can prepare your taxes, but with Lee Mandel & Associates you’ll have a creative and proactive team in your corner. Lee believes that every client deserves access, answers and priority-level treatment. So whether you have a quick tax question or need expert advice on a critical business issue, Lee and his team are there for you. His clients have included professional athletes and musicians, best-selling authors, small and medium-sized businesses in hundreds of different industries, and a cavalcade of unique individuals who have come to depend upon having Lee and his team in their corner.


“[H]is rates are competitive and he really knows his craft. I have never been “disappointed” with my bottom line (even when I was prepared to be disappointed.) He is also a great advisor on tax issues. I have called him with tax related questions during the year and he always returns my calls promptly and gives me thoughtful, helpful answers. Oh yeah, and did I mention he’s funny too? That really helps when [you’re] approaching April 15th… If you need tax advice, call Lee. You will be glad you did, even if it does mean going to Naperville once a year.”



“I would not think of doing my taxes without Lee Mandel’s expertise. Since 1995, I have consulted him and always received thoughtful and accurate answers. Lee is also an excellent business adviser, always getting to the core of sound decision-making. He has a lively and positive intelligence that is contagious. I leave Lee’s office with new examples demonstrating that he is the consummate entrepreneur. For this reason, he understands the individuality of his clients. In short: Lee has a comprehensive knowledge and understanding of tax law and preparation. He has a quick grasp of one’s business needs, provides thorough counsel, and has a great sense of humor. He is the most competent and personable person I have ever worked with on this unpleasant task.”