Neil Cassmeyer, CPA is a Saint Charles, MO CPA firm serving business owners, executives, independent professionals, small businesses, and individuals. The firm provides tax and accounting support across individual and business needs, with services that include tax preparation, tax planning, payroll, and small business accounting.

The practice also lists support for more complex tax matters, including tax resolution, IRS audit representation, non-filed returns, back taxes owed, liens, levies, wage garnishment, and payment plan matters. Business services include cash flow management, business valuation, strategic planning, succession planning, new business formation, nonprofit organization support, and internal controls.

For clients using accounting software, the firm offers QuickBooks services such as setup, answers, and tune-up support.