CPA Field Guide / US tax & accounting
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CPA & accounting software, by the numbers

Market share, integration openness, and pricing across the 25 US tax and accounting tools in this guide. Sourced; updated 2026-07-22.

Tax software market share

Usage share among 2,011 US preparers in the 2025 AICPA / Journal of Accountancy tax software survey.

Tax softwareMarket share (2025 AICPA survey)
UltraTax CS22.9%
Drake Tax16.3%
Lacerte15.8%
CCH Axcess12.5%
ProSeries10.5%
ATX4.6%
ProConnect3.8%

Integration openness

How the 25 tools break down by how easy they are to connect to:

FAQ

What tax software has the largest market share?

Thomson Reuters UltraTax CS leads at 22.9% share of surveyed firms, followed by Drake Tax and Intuit Lacerte (2025 AICPA tax software survey).

How many CPA tools offer an open API?

6 of the 25 tools in this guide offer a self-serve public API; 7 have a gated API, and the rest connect only via Zapier or file export.

Independent and no pay-to-list: only shipped capabilities (reviewed July 2026), maintained by the team behind DueDateHQ and held to the same standard as every other tool here. How this guide works →

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