Certified public accountants (CPAs) do far more than prepare tax returns. They audit financial statements, represent clients before the IRS, advise businesses on mergers and growth strategy, investigate fraud, and increasingly use AI tools to analyze financial data. What sets a CPA apart from a regular accountant is a state-issued license that grants legal authority to perform certain functions no other finance professional can touch.
What Only a CPA Can Do
The CPA license carries specific legal privileges that regular accountants, no matter how experienced, don’t have. The most significant is the authority to prepare audited financial statements. Every publicly traded company must file audited financials with the Securities and Exchange Commission, and only a CPA can sign off on those reports. This single requirement makes CPAs essential to every company listed on a stock exchange.
CPAs also hold the legal right to represent taxpayers before the IRS. If you or your business gets audited by the IRS or a state tax authority, a CPA can step in and defend your return, answer questions on your behalf, and negotiate with auditors. A regular accountant can prepare your tax return, but if the IRS challenges it, they can’t represent you in the same way.
External audits of any kind, whether for publicly held companies, nonprofits, or government entities, are handled by CPAs. An internal audit at a company might be performed by a staff accountant, but when an independent, external review is required, a licensed CPA firm takes over.
Tax Preparation and Planning
Tax work is the most visible part of what many CPAs do day to day. This goes well beyond filling out forms. CPAs help individuals and businesses structure their finances to minimize tax liability legally, which might mean advising on retirement contribution timing, choosing the right business entity type, or planning the tax implications of selling property or investments.
For businesses, CPAs handle quarterly estimated tax filings, payroll tax compliance, sales tax obligations, and year-end planning. They also help business owners understand how decisions like hiring employees, purchasing equipment, or expanding to new locations will affect their tax picture. The value a CPA brings to tax work is not just accuracy but strategy: structuring transactions before they happen so you pay what you owe and nothing more.
Auditing and Assurance
Auditing is the process of independently examining a company’s financial records to verify they’re accurate and follow established accounting standards. When a CPA firm audits a company, it issues an opinion stating whether the financial statements fairly represent the company’s financial position. Banks, investors, regulators, and business partners rely on these opinions to make decisions.
Beyond full audits, CPAs also perform reviews (a lighter level of assurance) and compilations (organizing financial data into standard formats without verifying it). The level of work depends on what the client needs and who will be reading the statements. A small business applying for a bank loan might need a review, while a company preparing for an IPO needs a full audit.
Business Advisory and Strategy
Many CPAs spend a significant portion of their careers advising businesses on financial strategy rather than crunching numbers. This includes helping companies evaluate whether to acquire another business, assessing the financial risks of a merger, and performing due diligence before a deal closes. Due diligence means going through the target company’s books, contracts, debts, and tax history to identify hidden problems before money changes hands.
CPAs involved in mergers and acquisitions work on integration planning as well, helping combine accounting systems, technology platforms, and financial reporting processes after two companies join. Risk assessment is a core part of this work: identifying what could go wrong financially after a deal closes and building a plan to manage those risks before they materialize. CPAs also help business owners set financial performance goals, build budgets, forecast cash flow, and evaluate whether a new product line or market expansion makes financial sense.
Forensic Accounting
Forensic accounting is a specialized niche where CPAs apply investigative techniques to financial records. Forensic accountants uncover fraud, trace missing funds, calculate economic damages in lawsuits, and serve as expert witnesses in court. Their work sits at the intersection of accounting and law, requiring them to piece together financial puzzles from incomplete or deliberately obscured records.
A forensic CPA might be hired by a company that suspects an employee of embezzlement, by an attorney who needs to quantify financial losses in a litigation case, or by a government agency investigating financial crimes. The work involves analyzing bank records, contracts, emails, and transaction histories to build a clear picture of where money went and who was responsible.
How AI Is Changing CPA Work
The day-to-day work of CPAs is shifting as artificial intelligence tools take over repetitive tasks. CPAs already use generative AI to read and summarize contracts, draft memos, process large volumes of supporting documents, and create data visualizations. More advanced AI systems can perform real-time reconciliation by accessing a company’s general ledger, subledgers, and bank feeds simultaneously, flagging discrepancies and generating draft adjustments for a human to approve.
The practical effect is that CPAs are spending less time on data entry and document processing and more time on the judgment calls that technology can’t make. As one industry description puts it, the profession is moving from a historical, compliance-based mindset to a data-driven, insights-led advisory role. AI handles the compliance workflows, analyzes data, verifies controls, and generates reports. The CPA reviews the output, exercises professional skepticism, and decides what it means for the client. This shift is making advisory and analytical skills more important than ever for people entering the profession.
What It Takes to Become a CPA
Earning a CPA license requires more education and testing than a standard accounting degree provides. Most states require 150 semester hours of college coursework, which is 30 hours beyond a typical four-year bachelor’s degree. Many candidates earn a master’s degree or complete additional undergraduate courses to meet this threshold.
After the education requirement, candidates must pass the Uniform CPA Examination, a rigorous multi-part test covering auditing, financial accounting, taxation, and regulation. Most states also require one to two years of supervised work experience under a licensed CPA before granting the full license.
The requirements don’t stop once you’re licensed. CPAs must complete continuing professional education (CPE) throughout their careers to keep their licenses active. The typical requirement is 60 to 80 hours of CPE over a two-year reporting period, depending on the type of work the CPA performs. At least half of those hours must be in technical subjects, and ethics courses are mandatory. CPAs who perform audit or financial statement preparation work face additional requirements, with a minimum number of hours specifically in accounting and auditing topics each year. This ongoing education ensures CPAs stay current with changing tax laws, accounting standards, and technology.
Where CPAs Work
CPAs work in a wide range of settings. Public accounting firms, from large international firms to small local practices, employ CPAs to serve outside clients with audit, tax, and advisory services. Corporate finance departments hire CPAs as controllers, chief financial officers, and internal audit directors. Government agencies at every level employ CPAs for budgeting, financial reporting, and regulatory enforcement.
Some CPAs run their own practices, serving individuals and small businesses with tax preparation, bookkeeping oversight, and financial planning. Others work in nonprofit organizations, educational institutions, or healthcare systems managing complex budgets and compliance requirements. The license is versatile enough that CPAs can move between industries throughout their careers, which is part of why the credential holds its value over time.