CPA Software Reviews

Independent rankings and reviews for accounting firms

Best UltraTax CS Hosting Providers for CPA Firms (2026)

By Dale Hoffman · Published July 30, 2026 · Updated September 23, 2026

UltraTax CS is rarely bought on its own. It is the tax engine of the Thomson Reuters CS Professional Suite, and the firms that run it usually run the whole suite together: FileCabinet CS or GoFileRoom for documents, Practice CS for management, Fixed Assets CS, and often Accounting CS beside them. That makes UltraTax hosting a question about hosting a complex, multi-application environment, not a single tax program. These tend to be established, multi-preparer firms, and some are large.

Thomson Reuters sells its own hosted option, Virtual Office CS, so one path is to let the vendor run the suite for you. Third-party hosting is the alternative firms choose when they want more flexibility over the environment, other applications in the same space, or pricing and support on their own terms. We scored the leading third-party providers on how well they handle a full CS Professional Suite workload, not tax hosting in general. Here is how they stack up in 2026.

Our picks at a glance

  1. 1
    Cetrom

    Best for a full CS Professional Suite at a larger firm

    8.9
  2. 2
    Verito

    Best dedicated performance for a heavy suite

    8.7
  3. 3
    Netgain

    Best for firms wanting hosting and security from one partner

    8.6
  4. 4
    Rightworks

    Best broad ecosystem for the CS suite

    8.5
  5. 5
    Ace Cloud

    Best budget pick, better suited to smaller suites

    7.7

1. Best for a full CS Professional Suite at a larger firm

Cetrom

8.9

White-glove managed IT built around CPA firms, which is exactly what a complex multi-application CS Professional Suite environment needs at a larger practice.

Pros

  • Environments built specifically for CPA firms, so a full CS Professional Suite with documents, practice management, and fixed assets is familiar territory
  • Strong reputation for hands-on, responsive support during filing season
  • Comfortable owning a complex environment where UltraTax, Accounting CS, and other applications all run together

Cons

  • Premium pricing by custom quote only, with add-on services such as hosted email, virtual desktop, and file services billed on top of core hosting
  • Aimed at mid-sized and larger firms, so a small UltraTax office will find the engagement heavier than it needs
  • Onboarding is a managed project rather than an instant self-service signup

The CS Professional Suite is the most involved environment in this category to host well. UltraTax rarely stands alone, and a firm running it usually has documents, practice management, and fixed assets all talking to each other in the same hosted space. Cetrom treats that as one managed relationship rather than a rented server, which is the right posture for a suite this interconnected. One team owns the whole environment, so the firm is not the integrator of last resort when something across two applications breaks.

That service comes at a premium, by sales conversation instead of a published rate. Core hosting is priced separately from add-ons like hosted email, virtual desktop, and file services, so the total climbs as you add services. Ask in writing which support is included in the monthly fee and which is billed by the hour or by project. The engagement is also heavier than a small shop needs. But UltraTax firms are rarely small, and the complexity of a full suite is precisely where a white-glove host earns its price. For an established multi-preparer firm running the whole CS stack, Cetrom is the strongest fit we found.

2. Best dedicated performance for a heavy suite

Verito

8.7

Dedicated private servers and published flat pricing keep a heavy CS Professional Suite steady, with a budget a firm can plan around.

Pros

  • Every firm gets an isolated dedicated server, which matters when the whole CS suite runs in one environment during peak season
  • Published flat monthly pricing that stays predictable as the firm adds preparers
  • Support staff who work only with tax and accounting software, not general IT tickets

Cons

  • Fewer CS-specific configurations than a specialist that lives in the Thomson Reuters world every day
  • Smaller company than the largest hosts in this space
  • Onboarding runs through their team rather than instant self-service signup

A full CS Professional Suite is a demanding tenant. Several applications running at once, multiple preparers in returns, and a shared document store all pulling on the same box adds up. Verito puts every firm on its own dedicated server, so that load stays isolated from other customers, which shows up as steadier performance in the weeks a suite firm can least afford a slowdown. The published flat price is easy to budget, a real benefit for a firm carrying the suite's own license cost.

What Verito does not offer is the CS-specific muscle of a dedicated Thomson Reuters specialist, and it is a smaller brand than the category giants. For a firm that wants dependable dedicated performance and a predictable bill under a heavy suite, without a full managed-IT engagement, it is the strongest performance-focused option here.

3. Best for firms wanting hosting and security from one partner

Netgain

8.6

A managed cloud and security partner that names UltraTax CS and Practice CS publicly, built on Microsoft Azure, with pricing only by quote.

Pros

  • Publicly names UltraTax CS and Practice CS among the applications it installs and tunes, and lists Thomson Reuters among its industry partners
  • Managed security is bundled in, including endpoint protection, firewall, and round-the-clock security monitoring
  • Support around the clock from staff who know UltraTax CS, CCH, and QuickBooks

Cons

  • Quote-only per-user pricing on a Microsoft Azure platform whose costs scale with users, storage, and computing power, so get in writing how the quote changes as the firm grows
  • Splits its focus across accounting, healthcare, and legal firms, so its support and roadmap are not dedicated to tax and accounting
  • Runs on Microsoft Azure Virtual Desktop rather than a dedicated server the firm has to itself, a different model worth understanding before you sign

Netgain has run managed IT and cloud services for more than 25 years, and in 2025 it launched CPA Cloud Essentials, a fully managed platform for small and mid-sized CPA firms built on Microsoft Azure Virtual Desktop. Its accounting pages name UltraTax CS and Practice CS directly, which matters for a suite firm, and it bundles managed security into the service. For a firm that wants the CS environment and its protection handled by one partner, that is a strong combination.

It ranks below the top two on cost predictability and focus. Pricing comes only through a sales conversation, and costs on an Azure-based platform can scale quickly as users, storage, and computing power grow, so get in writing how the quote changes when you add users, storage, or more powerful sessions for tax season. Netgain also splits its attention across healthcare and legal as well as accounting, so tax and accounting is not its whole business. Azure Virtual Desktop is also a different setup from a dedicated server, so ask how the suite's document store and peak-season load will be sized. For a mid-sized UltraTax firm comfortable in a Microsoft environment that wants hosting and security from one vendor, Netgain is a serious option.

4. Best broad ecosystem for the CS suite

Rightworks

8.5

The largest host in the space, with a broad ecosystem and wide experience hosting the CS suite on shared standard infrastructure.

Pros

  • Largest provider in the category, with a mature onboarding and migration process for moving a full suite over
  • Hosts the CS Professional Suite widely and can pair it with QuickBooks and other applications in one environment
  • Established account management and support structure

Cons

  • Standard plans run on shared servers, so a heavy suite's performance can vary with other tenants during peak weeks
  • Per-user pricing adds up quickly once a firm licenses several suite preparers
  • Support experience varies by plan tier

Rightworks, formerly Right Networks, hosts more accounting firms than anyone else, and it hosts the CS Professional Suite widely. Its ecosystem is the draw: a firm that also keeps client books in QuickBooks Desktop or runs add-on tools can put everything in one hosted space, with a migration process that has moved a lot of suites before.

The standard product is shared multi-tenant, which keeps entry pricing reasonable but means a heavy suite's peak-season speed is not fully in the firm's control. Dedicated upgrades exist for firms that outgrow it. For a suite firm that values a broad, well-trodden ecosystem over a dedicated box or a white-glove relationship, Rightworks is a solid middle choice.

5. Best budget pick, better suited to smaller suites

Ace Cloud

7.7

Aggressive pricing and around-the-clock support make Ace Cloud the value option, on shared infrastructure that can feel light under a large, complex suite.

Pros

  • Competitive pricing and frequent promotions that ease the cost of a full suite
  • Support available around the clock, including the overnight stretch during filing season
  • Hosts the CS suite alongside a wide range of other tax and accounting applications

Cons

  • Shared infrastructure on standard plans, with performance that depends partly on other tenants
  • Standard plans may feel light for a large, complex multi-application CS environment
  • Add-ons and upsells can complicate the final bill relative to the advertised rate

Ace Cloud competes hard on price and staffs support around the clock, which lands well for a smaller firm watching costs after paying for the suite itself. It hosts the CS Professional Suite and a long list of other applications, and for a lean UltraTax practice the value is real.

The caution is scale. Standard plans are shared by default, and a large firm running the full suite with many preparers and a busy document store can outgrow what a budget shared plan comfortably carries. Read the quote line by line, since add-ons move the number. For a smaller suite it is a reasonable trade, but bigger and more complex environments will be better served higher on this list.

Side by side

CetromVeritoNetgainRightworksAce Cloud
Server modelCustom, typically dedicatedDedicated private serverMicrosoft Azure Virtual Desktop, managedShared standard, dedicated availableShared standard, dedicated available
Pricing stylePremium custom quote, add-ons extraPublished flat monthlyPer-user quote only, can scale with usagePublished per userPublished per user, promos common
Best UltraTax CS fitLarger firms running the full CS suiteFirms wanting dedicated performance on a heavy suiteMid-sized firms wanting hosting and security togetherFirms wanting a broad ecosystemSmaller, cost-conscious suites

Frequently asked questions

How is hosting UltraTax CS different from hosting a standalone tax program?

UltraTax rarely runs alone. Most firms run it as part of the CS Professional Suite, alongside document management, Practice CS, Fixed Assets CS, and often Accounting CS. That makes it a multi-application environment where several programs share data and run at once, so the host you choose needs to be comfortable managing the whole suite, not just one tax program.

How is third-party hosting different from Virtual Office CS?

Virtual Office CS is Thomson Reuters hosting its own suite for you, which is the simplest path if you want the vendor to run everything. Third-party hosting is the alternative firms choose for more flexibility over the environment, the ability to run other applications in the same hosted space, and pricing or support arranged on their own terms. Both keep your data centralized and accessible from anywhere.

Will hosting keep the full CS suite fast during busy season?

It depends on the server model. A full suite with several applications, multiple preparers, and a shared document store is a heavy tenant. A dedicated server keeps that workload isolated from other customers, which helps performance stay steady during peak filing weeks. Shared plans cost less, but their speed depends partly on your neighbors.

How much does UltraTax CS hosting cost?

It varies by server model and number of users, and it tends to run higher than lighter tax software because the suite is a larger environment to host. Shared per-user plans are the cheapest way in, while dedicated servers and custom managed setups cost more. Because promotions and add-ons are common, ask each provider for an itemized quote rather than trusting the headline rate. With custom-quote managed hosts such as Cetrom and Netgain, also ask which services and support the base fee includes, which are billed separately, and how the price changes as you add users, storage, or services.

Is hosted UltraTax CS secure and IRS-compliant?

Hosting can help, but it does not replace your own written security plan. Look for multi-factor login, encrypted connections and storage, daily backups, and a SOC 2 report the provider will actually show you. The FTC Safeguards Rule and IRS Publication 4557 make your firm responsible for vetting the host.

Can I move my existing CS Professional Suite to a host?

Yes. Providers will migrate your UltraTax data, prior-year returns, document store, and the other CS applications into the hosted environment. Because the suite is a larger, interconnected setup, plan the migration well ahead of busy season so you are not moving a complex environment in the middle of filing.

Related coverage