Top 10 Tax Preparation Outsourcing Companies for Accounting Firms (2026)

Between April filings, extension deadlines, year-end planning, and preparation for the next tax season, many accounting firms operate under sustained workload pressure throughout the year. However, what changes isn’t the amount of work; it’s the type of work.

Extension season, in particular, brings some of the firm’s most technically demanding engagements. These returns often require senior-level expertise while firms are simultaneously managing vacations, turnover, and an increasingly competitive hiring market.

Meanwhile, the accounting profession continues to face a shrinking talent pipeline. Fewer graduates are entering the field, experienced professionals are harder to recruit, and client expectations continue to grow.

For firm leaders, this creates a fundamental capacity challenge. The question is no longer whether demand exists; it’s how to build a workforce capable of meeting it consistently.

Increasingly, firms are finding the answer beyond their local hiring market.

Why accounting firms are choosing to outsource tax preparation

Not long ago, many firms viewed the decision to outsource tax preparation as a temporary fix for busy season. Today, that mindset has changed. For many accounting firms, outsourcing has become a long-term strategy for building capacity, improving profitability, and staying competitive in an increasingly challenging hiring market.

The economics simply make sense

Hiring experienced tax professionals has become both expensive and unpredictable. A staff preparer in a mid-sized U.S. market can cost anywhere between $70,000 to $95,000 annually when salaries, benefits, recruiting costs, and training are factored in. Even after making that investment, there’s no guarantee they’ll stay beyond a couple of busy seasons.

By comparison, offshore tax preparation services allow firms to access experienced tax professionals at a significantly lower cost while maintaining quality standards. As a result, the outcome isn’t just lower operating expenses, it’s improved realization, healthier margins, and more predictable capacity.

Scale your team when you need it

One of the biggest challenges in tax is that demand isn’t consistent throughout the year. A firm may need six preparers during March, only two during the summer, five again during extension season, and then scale back once deadlines pass.

By contrast, hiring full-time employees for peak demand often leaves firms carrying excess capacity during slower months, while hiring for average demand almost guarantees resource shortages during busy season. Tax return preparation outsourcing services solves this problem by allowing firms to scale their workforce up or down based on actual workload instead of fixed headcount.

Let your accountants focus on higher-value work

Preparing tax returns is essential, but it isn’t always where your most experienced professionals create the greatest value. When routine preparation is handled through outsourced tax preparation services, partners and senior staff can spend more time on tax planning, advisory services, complex reviews, and client relationships. These are the services clients value most and are willing to pay a premium for.

Offshore talent has evolved

The offshore accounting industry has matured significantly over the past two decades. Today, offshore professionals are experienced in preparing U.S. tax returns and regularly work with platforms such as Drake, UltraTax CS, Lacerte, ProSeries, and CCH Axcess. Furthermore, they’re familiar with U.S. tax workflows, documentation standards, and review processes.

Faster turnaround through time zone advantage

What was once considered a communication challenge has become a competitive advantage. With offshore teams working while U.S. firms are offline, work can continue almost around the clock. Documents sent at the end of the U.S. business day can often be returned for review before the office opens the following morning. Consequently, firms see faster turnaround, better utilization of review teams, and greater flexibility during peak filing periods.

How we evaluated these tax preparation outsourcing companies

Before diving into the list, it’s important to explain our evaluation approach. Many “Top 10” lists in this industry are created by service providers themselves, often without sharing the criteria behind their rankings.

In the interest of transparency, we want to acknowledge that Infinity Globus is one of the companies featured in this list. It appears first because we are the publisher of this article, not because it was independently ranked as the top provider. Readers are encouraged to evaluate our profile with the same level of scrutiny they would apply to any company presenting its own services.

Each provider was assessed against six things an accounting firm can actually verify before signing:

• US tax specialization – is US tax preparation a core service or a side offering?
• Engagement flexibility – per-return, dedicated FTE, seasonal, or all three?
• Security posture – published certifications, not a marketing page about security
• Software coverage – the platforms firms actually run
• Delivery track record – years operating, firms served, retention
• Fit range – which size and type of firm does the model genuinely suit

Additionally, we have deliberately not published competitor pricing or certification claims we could not verify from a primary source. Where a figure matters to your decision, ask the provider directly and ask for documentation.

What to look for in a tax outsourcing partner

Choosing the right tax outsourcing partner is about more than finding additional capacity, it’s about finding a team you can trust with your clients, processes, and deadlines. Whether you’re evaluating outsourcing accounting services or dedicated tax preparation support, here are eight key factors to consider before making a decision.

1. Proven U.S. tax expertise

Look beyond general accounting experience. Ask how many Forms 1040, 1065, and 1120S returns the team prepared during the last tax season. If your clients require specialized work, ask about their experience with multi-state filings, Forms 5471, 8621, 8938, K-1 allocations, cost segregation, and other complex tax matters relevant to your practice.

2. Verified security and compliance

A SOC 2 Type II badge on a website isn’t enough. Instead, request a copy of the actual audit report and review its findings, including any exceptions. Strong security practices should be backed by independent verification, not just marketing claims.

3. Secure data environment

Understand exactly how client data is handled. The strongest providers typically use Virtual Desktop Infrastructure (VDI) or similar secure environments that prevent local data storage. Ask whether team members can download files, print documents, or capture screenshots, and ensure appropriate controls are in place.

4. Experience with your tax software

Your outsourcing partner should already be proficient in the software your firm uses. Whether it’s UltraTax, CCH Axcess, ProSystem fx, Lacerte, or Drake, they should be ready to work within your existing workflow without requiring extensive training during busy season.

5. Clearly defined turnaround times

Avoid vague promises such as “fast turnaround.” Instead, look for documented service-level commitments with measurable timelines, for example, 48 hours for a standard 1040 or 96 hours for a multi-state 1065. Clear expectations help ensure accountability.

6. A robust internal review process

Preparation quality matters just as much as speed. Ask whether every return undergoes an internal review before reaching your team. A documented multi-level review process can significantly reduce review time, minimize errors, and improve overall efficiency.

7. Scalable capacity during peak season

Tax season demand can change rapidly. Find out how the provider expands capacity during busy periods. Do they rely on experienced professionals who are already trained, or do they hire and train new staff during peak season? A mature scaling strategy reduces risk and maintains quality.

8. Transparent exit and transition terms

Even if you expect a long-term relationship, it’s important to understand the exit process upfront. Review the notice period, data return procedures, transition support, and any contractual obligations so there are no surprises if your needs change in the future.

2026 tax outsourcing benchmarks

Directional market ranges to sanity-check any proposal. Confirm specifics with each provider.

Two notes on reading these. First, per-return pricing looks cheaper on paper and often is not; once you account for review time on unfamiliar work, dedicated resources tend to win on total cost past a certain volume. Second, if a quote sits far below these ranges, ask what is being left out.

Top 10 tax preparation outsourcing companies for accounting firms

1. Infinity Globus

Infinity Globus is a global outsourced accounting and tax firm serving accounting firms across the USA. With over 20 years of industry experience, it delivers services through a centralized Global Operations Center, ensuring standardized processes, consistent quality, and scalable support.

Services offered: Individual and business tax preparation (1040, 1065, 1120, 1120S), multi-state tax return preparation, tax planning support, bookkeeping and month-end close, payroll, audit support, management accounting, and virtual CFO services.

Strengths:

• Over two decades of experience supporting accounting and tax firms globally.
• Experienced U.S. tax professionals proficient in leading tax software, including Lacerte, UltraTax CS, and Drake, enabling seamless integration with existing firm workflows.
• SOC 2 Type II compliant infrastructure with strong data security and standardized operating procedures.
• Flexible engagement models, including dedicated teams, seasonal staffing, and per-return support, allowing firms to scale based on workload.
• Structured quality control processes designed to improve accuracy, consistency, and turnaround times.
• Clients consistently point to the same outcome: Jonathan Convery, CPA, MBA, owner of Convery Tax & Accounting, reported the team took over tasks entirely and freed roughly 40 hours of his staff’s time to redirect toward client relationships and development.

Consider before you sign:

• The dedicated team model delivers the greatest value for firms with a steady volume of work. Smaller firms or those with seasonal requirements may find the per-return model more cost-effective.
• While Infinity Globus maintains a U.S. client-facing presence, tax preparation is performed through its offshore delivery center. Firms with strict onshore preparation requirements should clarify this before engagement.
• As with any outsourcing relationship, the accounting firm remains responsible for the final review and signature of tax returns.

Best for: Accounting firms that want a trained, technology-fluent offshore team embedded in their workflow and want the workflow itself improved, not just staffed.

2. QX Accounting Services (QXAS)

QX Accounting Services is one of the larger tax outsourcing companies built specifically around US and UK accounting firm workflows, operating at significant scale with a structured delivery methodology.

Services offered: Tax preparation, bookkeeping, payroll, audit support, client accounting services (CAS), reconciliations, and month-end close.

Strengths: Purpose-built for accounting firm delivery rather than adapted from general BPO work, which shows in the process documentation and white-labelled delivery options. Publishes security certifications including SOC 2 and ISO 27001. Offers both per-return and full-time-equivalent engagement models, and the scale means capacity is rarely a constraint during peak weeks. Firms report the onboarding methodology is well-defined.

Consider before you sign: Scale brings structure, and structure suits some firms better than others — if you prefer direct, informal access to the people doing your work, ask how account management is layered before you commit. Larger providers also tend to standardize process, which is a strength when your workflow is conventional and a friction point when it is not. Worth clarifying how your specific engagement is staffed and who your escalation path is.

Best for: Mid-size to large accounting firms that want a heavily processed, scalable delivery operation with published certifications.

3. MyCPE ONE

MyCPE ONE combines offshore accounting and tax staffing with a broader platform for accounting firms, including continuing education and practice management tools, positioning itself as more than a staffing vendor.

Services offered: Offshore tax preparation and staffing, bookkeeping, payroll, audit support, plus continuing professional education and firm-management tooling.

Strengths: The platform combines dedicated offshore staffing with education and practice management resources, reducing the need for multiple vendors. Its staffing model enables professionals to become familiar with a firm’s processes over time, supported by a strong presence within the US accounting community.

Consider before you sign: If your primary requirement is tax outsourcing, confirm whether staffing services can be engaged independently of the broader platform and verify the tax-specific expertise of assigned resources.

Best for: Firms seeking outsourced staffing together with practice management and continuing education resources.

4. TOA Global

TOA Global is a Philippines-based offshore staffing provider for accounting firms, distinguished by heavy investment in structured training and career development for its accounting staff.

Services offered: Outsourced tax preparation, bookkeeping, CAS, payroll, audit support, and dedicated offshore accounting staff.

Strengths: TOA Global is recognized for its structured training academy, strong employee retention, and experienced offshore professionals. Its long-term staffing approach allows firms to build consistent teams that integrate into existing workflows.

Consider before you sign: Since the model is based on dedicated staffing, firms should evaluate whether they have the internal capacity to manage remote team members and compare the overall engagement cost with alternative providers.

Best for: Firms prioritizing structured staff training, retention, and a long-term dedicated resource relationship.

5. Datamatics Business Solutions

Datamatics Business Solutions is the accounting and finance arm of a large, established technology and business process organization, bringing enterprise-scale infrastructure to accounting firm outsourcing.

Services offered: Tax preparation, bookkeeping, accounting, payroll, audit and assurance support, CAS, and M&A research support.

Strengths: The company offers enterprise-grade infrastructure supported by SOC 2 Type II and ISO 27001 certifications, workflow automation, and 24/7 delivery capabilities. Its ability to manage high-volume engagements makes it well suited for larger organizations.

Consider before you sign: Smaller firms should understand minimum engagement requirements and clarify how their account will be prioritized and managed within a larger enterprise environment.

Best for: Larger accounting firms and accounting departments that need enterprise-grade infrastructure and 24/7 coverage.

6. SurePrep (Thomson Reuters)

SurePrep approaches the capacity problem from the automation side first — document scanning, data extraction, and workpaper generation, with outsourced tax return preparation available on top of the software layer.

Services offered: 1040 and business return preparation, automated document ingestion and OCR (1040SCAN), taxpayer collaboration (TaxCaddy), workpaper automation, and outsourced return preparation.

Strengths: SurePrep’s automation-first approach reduces manual effort before tax preparation begins and integrates seamlessly with UltraTax CS, GoSystem Tax RS, and CCH Axcess. Backed by Thomson Reuters, it also benefits from strong security and compliance standards.

Consider before you sign: The platform delivers the greatest value to firms already using compatible tax software. Firms should also review pricing structures and long-term commitments before implementation.

Best for: Firms looking to combine tax automation with outsourced preparation within the Thomson Reuters ecosystem.

7. The Fino Partners

The Fino Partners provides outsourced accounting and tax services to accounting firms and businesses, with a service model oriented toward small and mid-size practices.

Services offered: Tax preparation and filing support, bookkeeping, accounting, payroll, CFO services, and audit support.

Strengths: The Fino Partners offers customized engagement models that allow firms to tailor services to their specific needs. Its ability to provide both tax preparation and bookkeeping under one roof makes it a practical choice for firms seeking a single outsourcing partner, backed by experience serving US accounting firms across multiple industries.

Consider before you sign: Firms handling complex tax engagements should confirm the experience of the assigned tax professionals and request documentation on security and compliance practices before onboarding.

Best for: Small to mid-size accounting firms wanting tax preparation and bookkeeping capacity from a single, flexible provider.

8. Finsmart Accounting

Finsmart Accounting delivers offshore tax preparation and accounting support to accounting firms with a mid-size, relationship-led model that sits between boutique providers and large-scale BPOs.

Services offered: Tax preparation support, bookkeeping, accounts payable and receivable, payroll, financial reporting, and offshore staffing.

Strengths: Finsmart combines relationship-driven service with dedicated offshore teams, enabling continuity across tax seasons. The company states SOC 2 certification, experience with multiple accounting platforms, and emphasizes delivering cost-efficient services without compromising accuracy.

Consider before you sign: Firms with significant tax preparation requirements should discuss the firm’s tax specialization, peak-season staffing strategy, and how additional capacity is managed during busy periods.

Best for: Firms wanting a mid-size, relationship-led offshore partner across accounting and tax.

9. CapActix Business Solutions

CapActix Business Solutions provides outsourced accounting, tax, and audit support to accounting firms, with an emphasis on automation and analytics layered into delivery.

Services offered: Individual and business tax preparation, bookkeeping, accounting, payroll, audit support, and financial analytics.

Strengths: CapActix combines tax outsourcing with workflow automation and analytics to improve efficiency. With delivery capabilities across multiple geographies and flexible engagement models, it offers firms the ability to scale resources while supporting a wide range of accounting services.

Consider before you sign: The service range is broad across tax, audit, bookkeeping, and analytics, so it is worth pinning down the tax-specific team depth and busy-season capacity plan for your engagement. Firms should request the specific security documentation relevant to taxpayer data handling rather than relying on general certification statements.

Best for: Accounting firms wanting automation-supported tax preparation capacity with multi-geography delivery.

10. AcoBloom International

AcoBloom International focuses on outsourced tax return preparation for US accounting firms, with a delivery model built around dedicated full-time resources and transparent pricing.

Services offered: Individual and business tax return preparation, foreign forms (5471, 8621, 8865, 8938), bookkeeping, accounting, and payroll.

Strengths: AcoBloom focuses primarily on tax preparation and offers experience handling complex international tax forms. The company provides dedicated tax professionals, supports multiple tax software platforms, and promotes a transparent engagement model designed for accounting firms.

Consider before you sign: The dedicated full-time model assumes volume sufficient to keep a resource occupied year-round, so smaller practices should discuss whether a seasonal or per-return arrangement is available. Firms should verify the current status of the stated certifications directly, and confirm how quickly additional resources can be added mid-season if volume exceeds the original scope.

Best for: Firms wanting dedicated, tax-focused offshore preparation capacity, particularly with international form requirements.

Compliance and data security: what US firms must get right

When outsourcing tax preparation, security and compliance should carry the same weight as technical expertise. Your outsourcing partner will have access to sensitive taxpayer information, making robust data protection and regulatory compliance essential, not optional.

Furthermore, outsourcing does not shift professional responsibility. The offshore provider prepares the return, but your firm remains responsible for reviewing, signing, and ensuring the accuracy of every filing. Choosing a provider with strong security controls therefore helps reduce operational risk while supporting your obligations under IRS Publication 4557 and the Written Information Security Plan guidance in Publication 5708.

Before entering into an engagement, ensure your outsourcing partner can demonstrate the following minimum safeguards:

• SOC 2 Type II certification, with the audit report available for review
• Virtual Desktop Infrastructure (VDI) that prevents client data from being stored on local devices
• Multi-factor authentication (MFA) for all systems and applications
• Restrictions on downloads, printing, screenshots, and external storage from preparer workstations
• Role-based access controls so employees can only access assigned client engagements
• A documented offboarding process that revokes system access promptly when employees leave
• Non-disclosure agreements (NDAs) signed at both the organization and individual employee level
• Comprehensive audit logs that can be reviewed when required

Therefore, don’t rely on security claims alone, ask for supporting documentation. Reputable outsourcing providers should be able to demonstrate these controls with certifications, policies, and audit reports. If they cannot, consider it a sign to evaluate the partnership more carefully.

How to decide which outsourcing company is right for your firm

Work through these in order.

Step 1: Define what you are actually buying. Capacity for a specific volume of returns? A permanent extension of your team? Automation-driven throughput? These lead to genuinely different providers.

Next, pick your engagement model by volume. Under roughly 100 returns a season, per-return pricing usually wins. Between 100 and 400, a dedicated resource typically costs less in total. Above 400, a small dedicated team with its own internal review becomes the efficient structure.

Then filter hard on software. Eliminate any provider not natively fluent in your platform. This filter alone usually cuts the list by half and saves you a painful first season.

Before discussing price, verify security. Request the SOC 2 report. Ask where data lives. Ask about download controls. Anyone who deflects is disqualified.

Once you have a shortlist, score it. Rate your final three on US tax depth, software fit, security documentation, turnaround commitment, communication overlap, scaling capability, and exit terms. Weight them for your practice.

Finally, pilot before you commit. Twenty returns, real ones, not test files. Measure preparation accuracy, review time consumed, and responsiveness to questions. Then decide.

Why we think Infinity Globus is the right fit

We have tried to write this list fairly, which means being equally direct about ourselves. Here is what we think we do well, and you should test each claim rather than take it.

Experienced U.S. tax professionals

Our teams consist of trained accounting and tax professionals with extensive experience in U.S. tax preparation. Through our centralized Global Operations Center, we maintain standardized processes, multi-level quality reviews, and consistent delivery across every engagement.

Technology-driven tax preparation

Our professionals work directly within leading tax platforms, including Lacerte, UltraTax CS, and Drake. By leveraging the automation and AI capabilities built into these solutions, we help reduce preparation time, improve accuracy, and integrate seamlessly into your firm’s existing workflow.

Flexible engagement models

Every firm has different capacity requirements. Our Business Your Way model allows firms to choose between dedicated full-time professionals, seasonal tax preparation support during busy and extension seasons, or per-return engagements, making it easy to scale resources as demand changes.

Predictable turnaround times

We believe expectations should be measurable. Rather than making broad promises about speed, we establish defined turnaround timelines based on return type, helping firms plan workloads with greater confidence.

Process improvement, not just additional capacity

Our objective is to become an extension of your team, not simply another outsourcing provider. Beyond increasing capacity, we focus on improving workflows, reducing review effort, and creating more efficient processes. Clients have shared that this approach has enabled them to redirect valuable time toward client relationships, advisory services, and business growth.

Security you can verify

Protecting client data is fundamental to every engagement. Infinity Globus operates with SOC 2 Type II compliance. We believe security should be supported by evidence, and we’re happy to provide the relevant documentation during the evaluation process.

Conclusion

There is no single best tax preparation outsourcing company. There is a best fit for your volume, your software, your client complexity, and your tolerance for managing a remote team.

Ultimately, what separates firms that succeed at outsourcing from firms that abandon it after one season is almost never the provider they picked. It is when they started, how they scoped the first engagement, and whether they treated the offshore team as an extension of the firm or as a vendor at arm’s length.

The window between October 15 and the New Year is the best onboarding runway you will get all year. Use it. Pilot before you commit. Verify security documentation rather than trusting badges. And choose the partner whose model matches the problem you are actually solving.

Frequently asked questions

Do I need client consent to outsource tax returns?

Generally yes, for offshore disclosure. Consent must be in writing, obtained before disclosure, and meet the content requirements of Rev. Proc. 2013-14. Most firms build this language into their annual engagement letter rather than requesting it separately during busy season.

How much does outsourced tax preparation cost?

In 2026, standard 1040 preparation typically runs $35–$120 per return, complex or multi-state returns $120–$250, and business returns $100–$300. Dedicated full-time offshore preparers generally cost $2,200–$3,800 per month. Most firms report total savings of 40–60% versus a US in-house hire.

How long does an outsourced tax return take?

During busy season, standard individual returns typically return within 24–72 hours, and business returns within 48–120 hours. Time-zone difference means work sent at end of day US time often comes back before the next morning. Confirm specific turnaround commitments in writing.

Which tax software do offshore teams use?

Established providers work in Drake, UltraTax CS, Lacerte, ProSeries, and CCH Axcess, plus workflow tools like SurePrep, TaxCaddy, and SafeSend. Choose a provider already fluent in your platform — training a team on new software during busy season consumes the capacity you were buying.

Can offshore teams handle multi-state returns?

Yes. Experienced offshore tax teams routinely prepare multi-state individual and business returns, including apportionment schedules and nexus-driven filings. Multi-state work is usually priced above single-state returns. Verify specific state coverage with your provider before assuming it.

What is the difference between outsourcing and offshore staffing?

Outsourcing sends discrete work to a provider who returns completed output, typically priced per return. Offshore staffing assigns you a dedicated resource who works as an extension of your team, priced monthly. Staffing suits consistent volume; outsourcing suits variable or seasonal work.

How do I protect client data when outsourcing?

Require SOC 2 Type II certification with the actual audit report, virtual desktop infrastructure with no local data storage, multi-factor authentication, disabled downloads and printing, role-based access, and documented offboarding. Maintain your own Written Information Security Plan under IRS Publication 5708.

Do offshore preparers sign the return?

No. The offshore preparer drafts the return and supporting workpapers. Your licensed accountant reviews, signs, and files it, retaining full professional responsibility. Outsourcing adds preparation capacity; it does not transfer professional liability or signing authority.

How many returns can one offshore preparer handle in a season?

An experienced full-time offshore preparer typically completes 200–350 individual returns or 80–150 business returns across a season, depending on complexity and review structure. Use these as planning estimates and confirm expected throughput with your provider before scoping.