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Head-to-head · Tax Software

UltraTax CS vs ONESOURCE Income Tax

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score UltraTax CS #1 in Tax Software 9.3/10 Pricing on request ✓ 0 of 2 features Visit UltraTax CS
ONESOURCE Income Tax #6 in Tax Software 8.7/10 Pricing on request ✓ 1 of 2 features Visit site

UltraTax CS leads on 0 checks, ONESOURCE Income Tax on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreUltraTax CS · 9.3/10
  • Most featuresONESOURCE Income Tax · 1 of 2

UltraTax CS scores higher on our rubric for tax software: 9.3 against 8.7 out of 10; our editors rank them #1 and #6.

UltraTax CS is the better fit for firms preparing broad multistate tax returns. ONESOURCE Income Tax is the better fit for mid-market and enterprise corporate tax teams.

  • UltraTax CS fits best

    Firms preparing broad multistate tax returns

  • ONESOURCE Income Tax fits best

    Mid-market and enterprise corporate tax teams

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Side by side

Feature UltraTax CS 9.3/10 Visit ↗ ONESOURCE Income Tax 8.7/10 Visit ↗
At a glance
Editor score 9.3 8.7
Ranking #1 in Tax Software #6 in Tax Software
Best for Firms preparing broad multistate tax returns Mid-market and enterprise corporate tax teams
Pricing model Paid Paid
Starting price Pricing on request Pricing on request
Free plan Not checked yet Not checked yet
Free trial — —
Deployment Cloud, Desktop Cloud
Platforms Web, Windows Web
Support Email, Live chat, Phone, Community, Docs Phone, Docs · 24/7
Integrations 11 integrations 6 integrations
Built for Solo, Small business, Mid-market, Enterprise Mid-market, Enterprise
Features UltraTax CS 0/2 · ONESOURCE Income Tax 1/2
Electronic filing Not checked yet ✓ (best)
Client portal Not checked yet Not checked yet
Specs
Tax types Not checked yet Not checked yet
Return types Not checked yet Not checked yet
Jurisdictions Not checked yet Not checked yet
Platforms Not checked yet Not checked yet
Our review
Pros
  • Prepares federal, state, and local returns across multiple filer types
  • Multistate allocation, related-return sharing, and built-in validation
  • E-filing workflow includes pre-submission diagnostics and status dashboard
  • Prepares federal, state, local, and international corporate returns
  • Tracks electronic filings and transfers federal data to state returns
  • Links trial-balance records to audit traces and tax-provision workflows
Cons
  • Custom pricing depends on users, returns, states, and jurisdictions
  • Support is not available 24/7
  • Multimonitor support is limited to four monitors
  • Pricing requires contacting sales
  • Designed for corporate tax operations, not individual tax filing
  • Cloud and API access may not suit teams seeking desktop-only software
Our verdict

UltraTax CS is professional tax preparation software from Thomson Reuters for accounting firms and tax preparers. It covers federal, state, and local return preparation for individuals, corporations, partnerships, estates, and trusts,…

Read the review →

ONESOURCE Income Tax is corporate tax software for teams preparing federal, state, local, and international returns. Its intended audience is mid-market and enterprise tax departments managing multistate or international compliance. The…

Read the review →
  1. UltraTax CSTax Software 9.3Pricing on request
  2. ONESOURCE Income TaxTax Software 8.7Pricing on request

Strengths and trade-offs

  • UltraTax CS — where it wins

    • Prepares federal, state, and local returns across multiple filer types
    • Multistate allocation, related-return sharing, and built-in validation
    • E-filing workflow includes pre-submission diagnostics and status dashboard

    Where it doesn't

    • Custom pricing depends on users, returns, states, and jurisdictions
    • Support is not available 24/7
    • Multimonitor support is limited to four monitors

  • ONESOURCE Income Tax — where it wins

    • Prepares federal, state, local, and international corporate returns
    • Tracks electronic filings and transfers federal data to state returns
    • Links trial-balance records to audit traces and tax-provision workflows

    Where it doesn't

    • Pricing requires contacting sales
    • Designed for corporate tax operations, not individual tax filing
    • Cloud and API access may not suit teams seeking desktop-only software
  • UltraTax CS9.3/10 · Pricing on request

    Broad professional return coverage with multistate tools and custom pricing.

    Visit UltraTax CSFull verdict →
  • ONESOURCE Income Tax8.7/10 · Pricing on request

    Corporate return preparation with broad jurisdiction coverage and tax-provision connections.

    Visit siteFull verdict →

More comparisons

All tax software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update