Thomson Reuters UltraTax CS vs Intuit ProSeries
An honest, context-aware comparison. No affiliate links. No paid placements. Just the data that helps you decide.
Thomson Reuters UltraTax CS
Professional tax preparation software for accounting firms (1040, 1120, 1065, 1041)
Intuit ProSeries
Professional tax software for small-to-medium CPA firms
Side-by-Side Comparison
Objective metrics, no spin.
For tax return preparation in public accounting firms. Essential for firms with >50 business returns annually.
For tax provision work (use OneSource), tax planning (use different tools), or if you're a sole proprietor (use ProSeries or Lacerte).
For small-to-medium tax practices, especially those already using QuickBooks. More affordable than UltraTax.
For large firms needing advanced workflow management or if you prepare ultra-complex returns (use Lacerte or UltraTax).
Both suited for: medium companies
Since both tools target medium companies, your decision should hinge on the specific use case above rather than company fit. Try the AI Advisor to get a recommendation tailored to your exact stack.
Still not sure? Describe your situation.
The AI advisor knows both tools and your full stack. Tell it your company size, current tools, and what's not working — it'll tell you which one actually fits.
Other Tax Compliance Tools to Consider
If neither is the right fit, these are the next best alternatives in the same category.