The Byrne CPA Firm, also presented as Byrne | Zizzi CPA, is a CPA accounting and tax firm serving clients from its Aberdeen, Mississippi presence and other listed Mississippi offices. The firm describes its work as extending beyond tax-season preparation, with an emphasis on tax management, planning, and year-round relationships with clients.

Its stated services include tax planning and tax services, bookkeeping, payroll, financial reporting, and accounting advisory. The firm works with individuals and small businesses and notes that its accountants stay involved between filing seasons to help keep books organized and simplify the final filing process.

The source material also describes a collaborative approach with clients' professional advisors, including attorneys and investment advisors, when coordinating financial, legal, investing, and personal goals. SafeSend Returns and online payment options are referenced on the firm's site.