Introduction
UltraTax CS and Lacerte are both premium professional tax platforms built for CPA firms and established tax practices. Neither is a mid-tier general-purpose tool. The audience for each is largely the same: multi-partner firms handling entity returns, K-1-heavy books, and clients with enough complexity that software capability carries real consequences for accuracy and liability exposure.
The distinction between them is not raw capability -- it is ecosystem fit, pricing architecture, and workflow. UltraTax CS comes from Thomson Reuters and sits at the center of the CS Professional Suite, a tightly integrated family of practice management, accounting, and fixed asset products. Lacerte comes from Intuit, the company behind QuickBooks and TurboTax, and sits at the top of Intuit's professional product line alongside ProSeries and ProConnect. Both platforms carry strong professional reputations. Choosing between them is primarily a question of which vendor's broader ecosystem your firm already operates in, and which pricing model fits your return volume and billing structure.
This comparison covers what each platform does well, how the pricing models differ, a side-by-side feature table, a decision guide by firm profile, switching considerations in both directions, and alternatives for firms where neither is the right fit. All pricing references in this article are approximate as of June 2026. Verify current pricing directly with Thomson Reuters (UltraTax CS) and Intuit (Lacerte, at intuit.com/professional) before any purchasing decision.
UltraTax CS: Thomson Reuters and the CS Professional Suite
UltraTax CS is the tax preparation product within Thomson Reuters' CS Professional Suite, a suite that includes Accounting CS (write-up and trial balance), Fixed Assets CS (depreciation and asset tracking), Practice CS (time billing and engagement management), FileCabinet CS (document management), and several other products. The suite is designed around a shared data model: information entered in one product flows into others without requiring duplicate data entry. For a firm running multiple CS suite products, UltraTax CS is not a standalone purchase -- it is a deeply connected node in an integrated workflow that spans the full firm lifecycle from write-up through filing.
That integration is the primary reason UltraTax CS has strong loyalty among existing Thomson Reuters users. Firms that have built their workflows around Accounting CS and Fixed Assets CS find that UltraTax CS reduces double entry, connects asset depreciation directly to the tax return, and keeps engagement tracking and billing in the same platform family. Switching away from UltraTax CS, for these firms, means more than replacing a tax preparation tool -- it means accepting workflow friction across the firm's other systems.
UltraTax CS uses an annual subscription pricing model. There is no per-return charge; per-state add-on fees apply for each state module. The subscription covers all federal returns filed during the year. This pricing structure makes total software cost predictable at the start of each season, regardless of return volume. For high-volume CPA firms filing hundreds of entity returns, the absence of a per-return charge produces meaningfully lower total cost than Lacerte's per-return accumulation. Verify current UltraTax CS subscription and state add-on pricing directly with Thomson Reuters before purchasing.
UltraTax CS is desktop-primary, with cloud and remote access available through CS Web, Thomson Reuters' hosted solution for the suite. CS Web allows browser-based access to UltraTax CS and other CS Professional Suite products without requiring a local installation on each workstation. This is a hosted desktop arrangement, not a native cloud application -- the software runs on Thomson Reuters' infrastructure and is accessed remotely, rather than being rebuilt as a web-native platform.
UltraTax CS covers federal and state returns across the major entity types: 1040, 1065, 1120, 1120S, 1041, 990, and estate and gift. Multi-state return support is built into the core platform. On G2, UltraTax CS user satisfaction ratings reflect strong scores among existing Thomson Reuters ecosystem users in particular, with the platform's tight suite integration consistently cited as a primary driver of loyalty. Rating data on G2 reflects user reviews at a point in time and should be treated as directional rather than definitive; verify current ratings directly on the G2 platform.
Lacerte: Intuit's Power-User Platform for CPA Firms
Lacerte is Intuit's highest-capability professional tax software product, positioned for CPA firms and established practices handling the most complex return workloads. Within Intuit's product family, it sits above ProSeries (mid-tier) and ProConnect Tax Online (cloud-native) in terms of diagnostic depth and complexity ceiling, while sharing the Intuit ecosystem's integration with QuickBooks, Intuit Link, and Rightworks hosting.
Lacerte is generally regarded as carrying particular strength in complex pass-through diagnostics: K-1 basis tracking on tiered partnership and S-corporation structures, passive activity loss limitation interactions across multiple entities, and multi-state apportionment and non-resident filing diagnostics on complex fact patterns. The diagnostic engine is designed to surface these interactions automatically, reducing the manual verification burden on complex returns where a missed interaction creates liability exposure. For CPA firms whose revenue is concentrated in complex entity returns billed at premium rates, the diagnostic layer functions as risk management infrastructure -- not just a software feature.
Lacerte's pricing model is structured differently from UltraTax CS: it combines a subscription with per-return charges, tiered by volume. The per-return cost at low volumes is substantial (verify current pricing at intuit.com/professional, as figures change annually), and total annual cost scales directly with how many returns you file. For a low-volume, high-complexity, premium-billing practice, the per-return model can be economically defensible. For a high-volume firm, the per-return accumulation produces a total platform cost that is difficult to justify against UltraTax CS's flat subscription.
According to Journal of Accountancy survey data, Lacerte is used by approximately 14.8% of CPA firms, placing it among the more widely adopted platforms in that professional segment. That figure is approximate and reflects survey data at the time of publication; verify with the original source for precise methodology and sample parameters.
Lacerte is desktop-primary, with remote access available through Rightworks (formerly Intuit Hosting) -- a hosted desktop arrangement, not a native cloud rebuild. Firms that want a native cloud alternative within the Intuit ecosystem should evaluate ProConnect Tax Online instead. Lacerte integrates with Intuit Link for client document collection and e-signature workflows, and with QuickBooks for importing business client financial data directly into tax return preparation.
On G2, Lacerte user satisfaction data shows strong scores in the "meets requirements" category, reflecting feedback from professionals at the high end of the complexity spectrum the platform is designed to serve. G2 ratings reflect user reviews at a point in time; treat them as directional and verify current data directly on the G2 platform.
Side-by-Side Comparison
| Feature | UltraTax CS (Thomson Reuters) | Lacerte (Intuit) |
|---|---|---|
| Pricing model | Annual subscription plus per-state add-ons; no per-return charge | Subscription plus per-return charges, tiered by volume |
| Starting cost (approx.) | Contact Thomson Reuters for current UltraTax CS subscription pricing; verify before purchasing | Per-return cost varies by volume; verify current pricing at intuit.com/professional before purchasing |
| At high return volume | Flat subscription may produce lower total cost than per-return accumulation | Per-return accumulation grows with volume; may be less economical at high volumes |
| Ecosystem | Thomson Reuters CS Professional Suite: Accounting CS, Fixed Assets CS, Practice CS, FileCabinet CS | Intuit: QuickBooks, ProSeries, ProConnect Tax Online, Intuit Link |
| Deployment | Desktop-primary; cloud/remote access via CS Web (hosted) | Desktop-primary; cloud/remote access via Rightworks (hosted) |
| K-1 / pass-through depth | Strong; widely considered equivalent for most CPA firm workloads | Generally regarded as stronger for complex multi-tier K-1 basis and passive activity diagnostics |
| Multi-state returns | Strong native multi-state support | Strong native multi-state support with integrated diagnostics |
| Suite integration | Tightest integration within the CS Professional Suite; shared data model reduces duplicate entry | Integrates with QuickBooks, Intuit Link, ProSeries; does not connect to Thomson Reuters tools |
| User satisfaction (G2, approx.) | High loyalty scores among existing Thomson Reuters ecosystem users; reflects strong suite integration benefit | High "meets requirements" scores, particularly among complex pass-through specialists; per G2 user reviews |
| Form coverage | 1040, 1065, 1120, 1120S, 1041, 990, estate and gift; federal and multi-state | 1040, 1065, 1120, 1120S, 1041, multi-state; verify specific form availability with Intuit |
| E-file | Yes, federal and state | Yes, federal and state |
| Best for | Firms already in the CS Professional Suite; high-volume CPA practices; firms using Fixed Assets CS or Accounting CS | Firms in the Intuit ecosystem; low-to-mid volume, high-complexity practices; K-1-heavy specialist firms |
All pricing figures are approximate and subject to change. Verify current rates directly with Thomson Reuters (UltraTax CS) and at intuit.com/professional (Lacerte) before any purchasing decision. G2 satisfaction data reflects user reviews at a point in time.
Ecosystem Fit: The Core Decision
For most CPA firms evaluating these two platforms, ecosystem fit is the most important factor -- more important than per-feature comparisons. Both platforms are capable of handling the full range of CPA firm returns. The question is which vendor's broader infrastructure already runs your practice.
The Thomson Reuters Case
Firms running Accounting CS for write-up and trial balance, Fixed Assets CS for depreciation tracking, and Practice CS for time billing and engagement management are already in the Thomson Reuters stack. For these firms, UltraTax CS connects directly to all three without requiring a data bridge or manual export. Asset depreciation flows from Fixed Assets CS into the tax return. Client financial data flows from Accounting CS. Time and billing connects through Practice CS. Switching to Lacerte means accepting workflow gaps at each of those connection points and either replacing those tools with Intuit equivalents or managing the data bridges manually.
This is what is meant when UltraTax CS is described as "sticky" for existing Thomson Reuters users. The switching cost is not just the tax preparation software -- it is the entire practice management infrastructure that connects to it. Firms that have built those connections over multiple years are not evaluating two tax products in isolation; they are evaluating a platform migration.
The Intuit Case
Firms running QuickBooks for client accounting, using ProSeries for a portion of their tax preparation work, or already enrolled in Intuit Link for client document collection and e-signature workflows are in the Intuit ecosystem. For these firms, Lacerte is the natural upgrade path rather than a platform migration. The Intuit Link client portal carries over between ProSeries and Lacerte without re-enrollment. QuickBooks data import workflows function within both platforms. The transition involves a pricing model change and a learning curve, but not an ecosystem migration.
Lacerte is also the appropriate choice for firms that need Intuit's specific diagnostic depth on complex pass-through returns and are not currently in the Thomson Reuters stack. For a firm evaluating both platforms from a neutral starting position, the diagnostic considerations around K-1 basis tracking and passive activity diagnostics on complex fact patterns favor Lacerte. For a firm whose complexity falls within what most platforms can handle, the ecosystem question returns to the front.
Pricing: Two Different Architectures
UltraTax CS and Lacerte charge for software differently, and the difference is structural rather than marginal.
UltraTax CS: Annual Subscription
UltraTax CS is sold as an annual subscription, with per-state add-on fees for each state module. There is no per-return charge. The total cost is determined before the season begins and does not change based on how many returns the firm files. For a high-volume CPA firm filing 200 or more entity returns annually, the absence of a per-return charge is a material advantage. The effective cost per return decreases as volume grows, and total platform cost is predictable for budgeting purposes.
Contact Thomson Reuters directly for current UltraTax CS subscription and state add-on pricing. Published pricing figures for this platform are not consistently available and change annually; rely only on a current quote from the vendor for any purchasing decision.
Lacerte: Subscription Plus Per-Return
Lacerte uses a subscription-plus-per-return structure. Volume-tiered pricing reduces the per-return cost as total return count increases, but even at higher tiers, the per-return cost accumulates to a total platform cost that is substantially higher than a flat subscription at most practical CPA firm volumes. Verify current per-return pricing and volume tiers at intuit.com/professional before purchasing; these figures change annually.
The per-return model is most defensible for a low-volume practice doing a small number of genuinely complex returns at premium billing rates. A firm billing $2,000 or more per complex entity return has a different cost-benefit calculation than a firm doing 150 mixed-complexity returns at average billing rates. At high billing rates, the Lacerte per-return diagnostic depth can reduce preparation time and liability exposure per return enough to make the premium economically rational.
Complex Return Handling: K-1, Pass-Through, and Multi-State
Both platforms operate at the top tier of CPA firm capability. The comparison on complex returns is about workflow and diagnostic emphasis, not about whether one platform can prepare a return that the other cannot.
Lacerte is generally regarded in the professional community as carrying particular strength in complex pass-through diagnostics: tiered partnership K-1 basis tracking, passive activity loss limitation interactions across multiple entities, and multi-state apportionment diagnostics on complex fact patterns. The diagnostic engine surfaces these interactions automatically, reducing the burden on the preparer to catch them through manual review. For firms whose books are concentrated in this return type, that diagnostic layer provides a tangible operational benefit.
UltraTax CS is widely considered equivalent for most CPA firm pass-through workloads and has strong multi-state return support built into the core platform. For firms whose complexity falls within what both platforms can handle -- which describes the majority of CPA firm practices -- UltraTax CS's suite integration advantage and more predictable pricing often determine the decision more than a diagnostic depth comparison. The diagnostic differentiation between the two platforms is most relevant at the upper end of pass-through complexity, on multi-tier structures with overlapping passive activity and at-risk interactions. For standard-to-moderate K-1 complexity, both platforms perform well.
Multi-state return handling is strong on both platforms and does not produce a meaningful distinction for most firms. Both include native multi-state diagnostics. Neither requires a separate add-on for basic multi-state filing. For firms with clients carrying genuinely complex domicile situations or multi-state apportionment requirements, both platforms are capable of handling the workload.
Decision Guide by Firm Profile
Six specific firm profiles frame the decision clearly. Match your practice to the profile that fits most closely.
Choose UltraTax CS If
- Your firm already uses Accounting CS, Fixed Assets CS, or Practice CS. This is the clearest case for UltraTax CS. If your practice runs any other product in the CS Professional Suite, adding UltraTax CS means building on infrastructure you already have, not purchasing a new ecosystem. The data integration between suite products reduces duplicate entry across write-up, depreciation management, time billing, and tax preparation. Switching to Lacerte would mean either replacing those tools or managing workflow gaps at every connection point.
- Your firm files a high volume of returns annually and needs flat, predictable software cost. UltraTax CS's annual subscription does not accumulate with return count. For a firm filing 200 or more entity returns per year, the total platform cost at that volume is likely lower than Lacerte's per-return accumulation. If software budgeting is a material consideration for your practice -- and for most firms it is -- the subscription model is worth quantifying against Lacerte's per-return structure using your actual return count.
- Your firm's return complexity is strong but not concentrated in the most complex multi-tier pass-through structures. UltraTax CS is widely considered equivalent to Lacerte for most CPA firm workloads. If your practice handles entity returns, multi-state filings, and K-1 work at standard-to-moderate complexity -- meaning you are not routinely working on tiered partnership structures with overlapping passive activity and at-risk interactions -- UltraTax CS covers that workload and the suite integration advantage makes it the more logical choice.
Choose Lacerte If
- Your firm is already in the Intuit ecosystem: QuickBooks, ProSeries, or Intuit Link. Lacerte is the natural upgrade path for firms in the Intuit product family. Intuit Link client portal access carries over. QuickBooks data import workflows carry over. The data conversion path from ProSeries to Lacerte is supported by Intuit's Tax Data Conversion Wizard. The transition is a pricing model change and a learning curve -- it is not an ecosystem migration the way switching to UltraTax CS would be for a ProSeries firm.
- Your practice is low-to-mid volume with complex, K-1-heavy returns billed at premium rates. Lacerte's per-return premium is hardest to justify at high volume and easiest to justify at low volume with high complexity. If your firm does 20 to 60 complex entity returns per year, billing $2,000 or more each, the diagnostic value of Lacerte's engine per return -- time saved, errors caught automatically, liability exposure reduced -- can offset the per-return cost in a way that does not work at 200 mixed-complexity returns. Run this math against your actual billing rates and return count before relying on a general rule.
- Your client book is concentrated in complex multi-tier pass-through structures where diagnostic depth is an operational necessity. If your practice regularly prepares returns involving tiered partnership structures, S-corporations with significant year-over-year basis adjustments, and clients where passive activity and at-risk rule interactions appear routinely across multiple entities, Lacerte's diagnostic engine is the appropriate tool. The distinction from UltraTax CS is most pronounced at this ceiling. If your return complexity profile consistently sits at this level, the diagnostic difference is material and the per-return cost can be justified as risk management expense.
Switching Considerations
A switch between UltraTax CS and Lacerte involves more than a data migration. Both directions carry ecosystem migration complexity that does not exist when switching between two platforms within the same vendor family.
From UltraTax CS to Lacerte
Moving from UltraTax CS to Lacerte means leaving the Thomson Reuters CS Professional Suite ecosystem. Every integration point between UltraTax CS and other suite products (Accounting CS, Fixed Assets CS, Practice CS) must be addressed. Either those tools are replaced with Intuit or third-party equivalents, or data currently flowing automatically between them is managed through manual exports and imports instead. For a firm that has built significant workflow around the suite integration, this is a large operational change. Budget for the data migration itself, the ecosystem transition, and a meaningful staff retraining period. Do not plan any migration during the filing season. Verify Lacerte's import capabilities for UltraTax CS data formats directly with Intuit before planning a switch.
From Lacerte to UltraTax CS
Moving from Lacerte to UltraTax CS involves a similar ecosystem transition in the other direction. Intuit Link client portals, QuickBooks integrations, and Rightworks hosting are all Intuit-specific infrastructure. A switch to UltraTax CS means migrating client data (prior-year returns, carryforwards, depreciation schedules), retraining staff on Thomson Reuters' workflow conventions, and either adopting other CS Professional Suite products or accepting that UltraTax CS's suite integration advantage will not be accessible immediately. Verify UltraTax CS's import capabilities for Lacerte data directly with Thomson Reuters, and verify current state module availability for your firm's filing profile before planning a switch.
Timing and Carryforward Data
Any platform migration between UltraTax CS and Lacerte should be planned for the off-season: summer through early fall is the strongly preferred window. Complete data migration, run verification on prior-year files, train staff, and begin the next filing season on the new platform with no concurrent migration underway. Carryforward data, depreciation schedules, and K-1 basis history are the highest-risk elements in any migration. Errors in these carry forward across multiple filing seasons and create problems that are expensive to correct after the fact. Test the conversion on a representative sample of prior-year client files before committing the full migration.
Alternatives to Consider
If neither UltraTax CS nor Lacerte fits your firm's profile, three alternatives are worth placing alongside this comparison.
- CCH Axcess Tax (Wolters Kluwer). For firms evaluating enterprise tax platforms and wanting a native cloud architecture rather than a hosted desktop, CCH Axcess Tax from Wolters Kluwer is the comparison point. CCH Axcess is a cloud-native rebuild of the CCH ProSystem fx Tax platform and targets mid-to-large CPA firms that want cloud-first infrastructure with enterprise-grade form coverage. If your evaluation of UltraTax CS and Lacerte is driven in part by wanting true cloud access rather than hosted desktop access, CCH Axcess is the option to include. Contact Wolters Kluwer for current pricing and availability.
- ProConnect Tax Online (for cloud-native access within the Intuit ecosystem). If you are considering Lacerte primarily for its Intuit ecosystem integration but want a native cloud platform rather than Rightworks hosted access, ProConnect Tax Online is Intuit's cloud-native professional tax product. It covers the same Intuit ecosystem integration points (QuickBooks, Intuit Link) with a browser-native workflow. It does not match Lacerte's full diagnostic depth on the most complex pass-through returns, but for firms where cloud-native access is a primary requirement, it is the appropriate Intuit platform to evaluate. See our ProConnect Tax vs Lacerte comparison for a detailed breakdown.
- Lacerte vs ATX and Lacerte vs ProSeries. If you are evaluating Lacerte against the broader field of CPA firm platforms, our comparisons of Lacerte against ATX (Wolters Kluwer's flat-fee mid-tier platform) and Lacerte against ProSeries (Intuit's own mid-tier product) cover the pricing model analysis and firm profile matching in detail. Both are relevant for a firm narrowing from the full set of options. For a broader look at the professional tax software landscape and how to match platforms to firm type, see our guide on best tax software for independent preparers.
- TaxWise via Americas Tax. Americas Tax is an authorized CCH TaxWise reseller. TaxWise is purpose-built for independent preparers and service bureaus, with native bank product integration, Spanish-language forms, and direct reseller support from ATP staff with over 25 years serving independent preparers. For a practice evaluating platform cost alongside bank products, Spanish-language capability, and responsive reseller support, TaxWise is worth a direct conversation. Visit our software page for current package pricing or call 224-388-1774.
Frequently Asked Questions
Is UltraTax CS or Lacerte better for complex returns?
Both are elite platforms capable of handling the most complex CPA firm return workloads. The distinction is workflow and ecosystem, not raw form capability. Lacerte is generally regarded as stronger for complex pass-through diagnostics: K-1 basis tracking on tiered partnership structures, passive activity loss interactions, and multi-state filing diagnostics on complex entity fact patterns. UltraTax CS is widely considered equivalent for most CPA firm workloads and has strong multi-state support, with particular advantages for firms already integrated into the Thomson Reuters CS Professional Suite (Accounting CS, Fixed Assets CS, Practice CS). Verify which platform matches your specific return complexity profile with each vendor before purchasing.
What is the pricing difference between UltraTax CS and Lacerte?
The pricing structures are different in architecture, not just in dollar amount. UltraTax CS uses an annual subscription model with per-state add-on fees; there is no per-return charge. Lacerte uses a subscription plus per-return model, tiered by volume. At high return volumes, UltraTax CS's flat subscription structure may produce lower total platform cost than Lacerte's per-return accumulation. At lower volumes with complex, high-billing-rate returns, Lacerte's per-return model may be easier to justify. Both vendors set pricing annually and it varies by firm size, add-ons, and promotional terms. Verify current pricing directly with Thomson Reuters (for UltraTax CS) and Intuit (for Lacerte, at intuit.com/professional) before making any purchasing decision.
Can I switch from UltraTax CS to Lacerte?
Yes, but the migration involves more than a data import. Switching from UltraTax CS to Lacerte means moving from the Thomson Reuters CS Professional Suite ecosystem to the Intuit ecosystem. Any integrations with Accounting CS, Fixed Assets CS, Practice CS, or other Thomson Reuters tools will need to be replaced or rerouted. Lacerte offers data import tools that can bring in prior-year data from other platforms, but the ecosystem migration complexity is the more significant operational consideration. Plan any switch during the off-season, verify import capabilities with Intuit directly, and budget for staff retraining and workflow changes that extend beyond the tax preparation platform itself.
What is the CS Professional Suite?
The CS Professional Suite is Thomson Reuters' integrated suite of practice management, accounting, and tax software for CPA firms. It includes UltraTax CS (tax preparation), Accounting CS (write-up and trial balance), Fixed Assets CS (depreciation and asset management), Practice CS (time billing and project management), FileCabinet CS (document management), and other products. The suite is designed so that data entered in one product flows into others without duplicate entry. Firms already using multiple CS Professional Suite products are said to be "in the Thomson Reuters stack," and for these firms, UltraTax CS is a natural fit because the ecosystem integration produces the most operational value.
Does UltraTax CS offer cloud access?
Yes. UltraTax CS is desktop-primary but offers cloud and remote access through CS Web, Thomson Reuters' hosted solution for the CS Professional Suite. CS Web allows browser-based access to UltraTax CS and other suite products without requiring a local installation on each workstation. This is a hosted desktop arrangement, not a native cloud application -- the software runs on Thomson Reuters' infrastructure and is accessed remotely, rather than being rebuilt as a web-native platform. Lacerte offers similar remote access through Rightworks (formerly Intuit Hosting), also a hosted desktop arrangement rather than a native cloud application. The native cloud alternative within the Intuit product line is ProConnect Tax Online. Verify current CS Web availability and pricing with Thomson Reuters before purchasing.
Related Comparisons
- Lacerte vs ProSeries: How Lacerte compares to Intuit's own mid-tier platform, including the per-return math and the upgrade path between them.
- Lacerte vs ATX: Lacerte compared to ATX (Wolters Kluwer's flat-fee multi-entity platform), including a pricing model breakdown and decision guide by firm type.
- ProConnect Tax vs Lacerte: Intuit's cloud-native platform compared to Lacerte for firms evaluating cloud-first access within the Intuit ecosystem.
- Best tax software for independent preparers: A broader look at the professional tax software landscape across firm types and pricing tiers.