Koppenhaver & Associates, PC is a Mount Vernon, IA accounting firm serving individuals, small businesses, nonprofits, and farming clients. The firm provides accounting and tax services with support for business owners, executives, and independent professionals.

Its services include individual and business tax preparation, bookkeeping, payroll, tax planning, new business formation, and help with IRS notices and audits. The firm also offers small business consulting, audit-related support, and part-time CFO services. Listed capabilities include work with farming, banking, manufacturing, and nonprofit clients, along with QuickBooks support.