GoSystem Tax RS vs UltraTax CS

The verdict at a glance

GoSystem Tax RS scores higher overall (74 to 74), but the right pick depends on what you weight.

GoSystem Tax RS is Thomson Reuters' cloud tax preparation software for large CPA firms, built for consolidated 1120s, big partnerships and multistate work, with 1040, 1041, 990, 706, 709 and 5500 returns alongside, sold by quote only.

UltraTax CS is Thomson Reuters' professional tax preparation software for CPA firms, covering individual, business, fiduciary, exempt and estate returns with federal and state e-file, sold as part of the CS Professional Suite.

Quick facts

• GoSystem Tax RS AF score. 74/100
• GoSystem Tax RS implementation. High
• GoSystem Tax RS best fit. Top 100 firms, complex 1120s
• UltraTax CS AF score. 74/100
• UltraTax CS implementation. Medium
• UltraTax CS best fit. Firms on the CS Professional Suite

Dimension by dimension

• Compliance depth. GoSystem Tax RS 79, UltraTax CS 74. Edge: GoSystem Tax RS.
• Scalability. GoSystem Tax RS 76, UltraTax CS 72. Edge: GoSystem Tax RS.
• AI / agent readiness. GoSystem Tax RS 60, UltraTax CS 38. Edge: GoSystem Tax RS.
• Support. GoSystem Tax RS 63, UltraTax CS 58. Edge: GoSystem Tax RS.
• Implementation. GoSystem Tax RS 57, UltraTax CS 66. Edge: UltraTax CS.
• Pricing transparency. GoSystem Tax RS 25, UltraTax CS 30. Edge: UltraTax CS.
• Tax content & coverage. GoSystem Tax RS 90, UltraTax CS 84. Edge: GoSystem Tax RS.
• Integrations & data flow. GoSystem Tax RS 87, UltraTax CS 80. Edge: GoSystem Tax RS.

Pick GoSystem Tax RS if

• Top 100 and large regional firms filing consolidated 1120s, insurance company returns and multistate partnerships with hundreds of partners
• Firms with a tax technology team that wants to push workpaper data into returns and track e-file status through an API
• Thomson Reuters shops already on SurePrep, SafeSend, GoFileRoom or FirmFlow that want the return engine those tools connect to

Pick UltraTax CS if

• Firms of 6 to 500+ preparers already on Accounting CS, Workpapers CS or Practice CS that want one client list and data sharing across them.
• Practices with heavy multistate, fiduciary, exempt and estate work that want those forms and state e-file in one package.
• Firms that buy or plan to buy SurePrep and SafeSend and want document intake, preparation and e-sign delivery wired into the tax software.

Further reading

• Blank-screen incident two days before the 15 September deadline (GoSystem Tax RS, Sep 2026)
• Release 25-5F adds Data Query, OData APIs and retires SOAP (GoSystem Tax RS, May 2026)
• Intermittent errors opening returns early in filing season (GoSystem Tax RS, Jan 2026)
• UltraTax CS stays first in the 2026 JofA survey, at 22.3 percent (UltraTax CS, Sep 2026)
• Ready to Review becomes generally available in the US (UltraTax CS, Dec 2025)
• UltraTax CS 2025 ships with Tax Automation (UltraTax CS, Nov 2025)

Keep exploring

• The full GoSystem Tax RS review: scores, pricing, and where it fits.
• The full UltraTax CS review: scores, pricing, and where it fits.
• CCH Axcess Tax vs GoSystem Tax RS
• Drake Tax vs UltraTax CS

Both reviews are updated on a rolling cycle by our research agents.