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Your Trusted Partner for Accounting Solutions
Leff Klein & Kalfen has provided personalized financial guidance to individuals and businesses for over two decades. Our expertise spans tax management, accounting services, audits, and financial statements, positioning us as a leading firm in Chicago. By combining deep industry knowledge with a dedicated team, we ensure every client receives tailored analysis and attention. Our commitment to high standards, seasoned tax professionals, and ethical practices has earned us enduring client trust.

We prioritize proactive strategies to maintain financial viability while aligning with client goals through transparent communication and research-driven solutions. Recognized as a staple in Chicagos business community, our responsiveness and competence deliver timely, reliable advice to support long-term success.
Services
Personal Financial Planning Retirement Planning Small Business Accounting Bookkeeping Services Payroll Processing Tax Services QuickBooks Setup Tax Relief IRS Audit Representation Business Advisory
Highlights and features
  • We have over 20 years of experience providing personalized financial guidance.
  • Our team includes Certified Public Accountants and QuickBooks ProAdvisors.
  • We offer tailored accounting solutions for diverse industries like healthcare and law.
  • Our firm is recognized as a leading accounting provider in Chicago.
  • We combine expertise with proactive strategies to meet client financial goals.
Services
Personal Financial Planning
We develop comprehensive financial plans to help individuals achieve long-term goals like retirement, education savings, and wealth transfer. Our strategies integrate tax planning, investment analysis, and risk assessment to optimize outcomes. Clients benefit from personalized guidance tailored to their unique financial situations and life milestones.
Small Business Accounting
Our accounting services support small businesses with financial reporting, cash flow management, and strategic tax planning. We provide budgeting, profit analysis, and internal controls to enhance profitability. Clients gain actionable insights through customized financial statements and outsourced CFO support to drive informed decision-making.
Tax Services
We offer end-to-end tax solutions for individuals and businesses, including preparation, planning, and audit representation. Our expertise covers complex scenarios like cryptocurrency accounting and IRS dispute resolution. Clients receive proactive strategies to minimize liabilities while ensuring compliance with evolving tax regulations.
QuickBooks Services
Our QuickBooks specialists provide setup, training, and troubleshooting for small to mid-sized businesses. We optimize software functionality for bookkeeping, payroll, and financial reporting. Clients gain efficiency through tailored system configurations and ongoing support to streamline accounting processes.
Payroll Processing
We handle payroll administration, tax compliance, and reporting for businesses of all sizes. Services include direct deposit, W-2/1099 processing, and legislative compliance updates. Clients reduce administrative burdens while ensuring accurate, timely payroll execution with expert support.
People
Michael Leff
Senior Accountant, CPA
Michael Leff, a CPA since 2003, specializes in tax, auditing, and accounting software support for diverse industries including real estate and manufacturing. He joined LKK in 1998 after roles at Ohio State University and a Chicago printing firm.
Robert Schlumpberger
Certified QuickBooks ProAdvisor
Robert Schlumpberger brings expertise in asset-based lending audits, tax, and QuickBooks consulting. With prior roles in credit analysis and manufacturing controllership, he joined LKK after working at Altshuler, Melvoin and Glasser.
Diane Klein
Accounting Specialist
Diane Klein oversees bookkeeping, financial statements, and tax reporting for manufacturers and service firms. She has been with LKK since 1986, contributing to client accounting and internal management processes after teaching in Chicago public schools.
Questions
What accounting services do you offer for small businesses?
We provide bookkeeping, payroll, financial reporting, cash flow management, and tax planning tailored to small businesses.
How can you help with retirement planning?
We evaluate your financial situation, create retirement budgets, and optimize Social Security and tax strategies to meet long-term goals.
Do you handle complex tax situations like IRS audits?
Yes, we offer IRS audit representation, tax relief, and resolution for back taxes, liens, and wage garnishments.
Can you assist with QuickBooks setup and training?
Our Certified QuickBooks ProAdvisors provide software setup, customized training, and ongoing support for efficient accounting.
What industries do you specialize in?
We serve construction, healthcare, law firms, real estate, manufacturers, and non-profits with industry-specific accounting solutions.