Market Size for CPA firm in 2026 [Example]

The Total Available Market (TAM) for CPA firms globally can be estimated at around $500 billion annually. This figure includes all businesses that require accounting services, tax preparation, and financial advisory. Considering that there are approximately 1 million active CPA firms and accounting professionals worldwide, this includes not just small businesses but larger enterprises as well who rely on CPA services for compliance and strategic financial planning.

The global accounting services market is growing due to increasing complexities in taxes and regulations, which means more businesses are seeking professional help. Therefore, targeting businesses across all sizes, from solopreneurs to large corporations, contributes to this sizable TAM figure.

The Serviceable Addressable Market (SAM) can be narrowed down to about $75 billion. This focuses specifically on small to medium-sized businesses (SMBs) that actively seek CPA services. Given that there are approximately 200,000 small businesses in the U.S. that utilize CPA services on a regular basis, and that the average expenditure on accounting services per SMB is around $375 annually, we can calculate the SAM.

This number also accounts for the recognition that not every business will use these services consistently and that many small businesses may only require part-time assistance at certain times of the fiscal year.

For the Serviceable Obtainable Market (SOM), we can realistically target capturing around 1-2% of the SAM in our first year, which equates to approximately $1.5 million. This would represent about 4,000 businesses opting for CPA services throughout the year. Given that CPA firms can utilize various marketing channels including online marketing and referrals, this is a reasonable estimate for a new firm entering the space that is looking to build credibility and a client base over the first year of operation.

By starting small and gradually expanding the client base, this figure reflects a realistic growth trajectory for a solopreneur CPA firm without over-exaggerating the initial market capture.