Tax season has a way of testing even the most organized accounting teams. As workloads continue to grow and firms look for more flexible ways to manage demand, tax preparation outsourcing has become an established part of the industry rather than a temporary solution.

Today, a wide range of providers support accounting firms, CPA practices, and tax professionals with tax preparation services, each bringing different strengths, specializations, and delivery models to the table. Some focus on serving small and mid-sized firms, while others work primarily with larger organizations handling complex tax engagements.

To help narrow the field, we've compiled a list of the best tax preparation outsourcing companies in 2026. The companies featured below have built strong reputations in the market and are frequently considered by firms looking to expand capacity, improve efficiency, and maintain consistent support during busy tax periods.

1. NeoWork

NeoWork is a global staffing and operations company that helps businesses build distributed teams across a variety of business functions, including administrative support, bookkeeping, and back-office operations. For accounting firms and tax professionals looking to expand capacity during busy filing periods, we provide dedicated professionals who can assist with financial support tasks, document management, data organization, and other operational responsibilities that are often connected to tax preparation workflows. Our team members work within existing processes, helping firms manage fluctuating workloads without changing how they operate.

We offer both individual staffing and managed team solutions, depending on the level of support required. Our recruitment process is selective, with 3.2% of interviewed candidates being hired, and we report a 91% annualized teammate retention rate. For firms involved in tax preparation and related accounting services, stable team structures can be important during recurring tax seasons and ongoing client engagements. In addition to staffing, we manage recruitment, onboarding, upskilling, and workforce support for the professionals assigned to client teams.

Key Highlights:

• Supports accounting firms with bookkeeping and tax-related operational support
• Provides dedicated professionals integrated into existing teams
• Offers both individual staffing and managed team solutions
• Hires 3.2% of interviewed candidates through a selective recruitment process
• Reports a 91% annualized teammate retention rate
• Manages recruitment, onboarding, and workforce support for assigned staff
• Serves businesses across multiple industries

Services:

• Tax preparation outsourcing
• Bookkeeping support
• Virtual assistants for administrative and finance-related tasks
• Back-office operations support
• Workforce management
• Quality assurance services
• Dedicated reporting and operational support
• Customer experience and support team staffing

Contact Information:

• Website: www.neowork.com 
• Facebook: www.facebook.com/neoworkteam
• LinkedIn: www.linkedin.com/company/neoworkteam
• Instagram: www.instagram.com/neoworkteam

2. Taxfyle

Taxfyle focuses on helping accounting firms manage tax workloads through an outsourced network of tax professionals. The company connects firms with US-based CPAs and EAs who assist with tax return preparation, tax review, and bookkeeping tasks. Its model is built around giving firms additional capacity during busy periods while allowing internal teams to continue managing client relationships and day-to-day operations.

One area that stands out is the emphasis on workflow visibility. Taxfyle provides a structured environment where firms can track engagements, communicate with tax professionals, and manage projects through integrated systems. Alongside tax preparation support, the company places importance on data security, using measures such as encryption, two-factor authentication, and compliance-focused controls to protect financial information.

Key Highlights

• Supports accounting firms with outsourced tax preparation, review, and bookkeeping
• Works with a network of US-based CPAs and Enrolled Agents
• Provides visibility into tax engagements and workflow progress
• Integrates with accounting workflow management platforms
• Uses encryption, two-factor authentication, and security monitoring practices
• Supports firms during seasonal workload increases and capacity constraints

Services

• Tax return preparation
• Tax review support
• Bookkeeping services
• Tax filing support
• Workflow management assistance
• Tax advisory support

Contact Information:

• Website: www.taxfyle.com
• Facebook: www.facebook.com/taxfyle
• Twitter: x.com/Taxfyle
• Instagram: www.instagram.com/Taxfyle
• Address: 2901 Florida Ave, Coconut Grove, FL 33133
• Phone: 1-855-829-3953

3. Meru Accounting

Meru Accounting provides outsourced accounting and tax-related services for businesses operating across different industries. Within tax preparation, the company assists organizations that want external support for filing requirements, compliance tasks, and financial record management. Its approach is closely connected to bookkeeping and accounting processes, helping businesses keep financial information organized throughout the year.

A noticeable part of their offering is the broad coverage of business functions surrounding tax preparation. Beyond preparing returns, the company discusses workflow integration, reporting, audit support, and compliance management as part of the overall process. This makes tax preparation one component of a wider accounting support structure that businesses can use as their needs evolve.

Key Highlights

• Supports businesses with outsourced tax preparation and compliance tasks
• Combines tax services with bookkeeping and accounting support
• Works with companies across multiple industries
• Assists with reporting, documentation, and financial record organization
• Covers both business and individual tax-related requirements
• Provides support for audit preparation and compliance activities

Services

• Tax preparation
• Corporate tax support
• Personal tax support
• Payroll tax services
• Bookkeeping
• Audit support
• Financial reporting
• Compliance management

Contact Information:

• Website: www.meruaccounting.com
• Email: hello@meruaccounting.com
• LinkedIn: www.linkedin.com/company/meru-accounting
• Instagram: www.instagram.com/meru_accounting
• Phone: +1 714 987-9001

4. ProcStat

ProcStat provides tax preparation outsourcing services designed for accounting and tax firms that need additional support during busy filing periods. The company works as an extension of internal teams, helping firms manage tax return preparation while maintaining their existing workflows and software environments. Its services are geared toward firms looking to increase capacity without expanding in-house staffing.

Security and operational continuity are recurring themes across their tax outsourcing offering. The company highlights the use of secure data handling practices alongside flexible staffing support that can adapt to changing workloads throughout the year. The focus remains on helping firms process tax work efficiently while maintaining established procedures and compliance requirements.

Key Highlights

• Provides outsourced tax preparation support for accounting firms
• Works alongside existing internal processes and workflows
• Supports firms during peak tax season and fluctuating workloads
• Emphasizes secure handling of financial information
• Offers scalable staffing support for tax operations
• Integrates with common tax preparation environments

Services

• Tax return preparation
• Tax compliance support
• Tax filing assistance
• Seasonal tax staffing
• Accounting firm support
• Workflow integration
• Tax documentation processing

Contact Information:

• Website: procstat.com
• Email: connect@procstat.com
• Facebook: www.facebook.com/people/ProcStat/61565508647276
• Twitter: x.com/ProcStat_
• LinkedIn: www.linkedin.com/company/procstat
• Instagram: www.instagram.com/procstat_
• Address: 4030 Wake Forest Rd, Raleigh, NC 27609, USA
• Phone: (252) 518-6563

5. Thomson Reuters Outsource

Thomson Reuters Outsource offers tax preparation outsourcing services for accounting and tax firms that need additional support throughout the year or during peak filing periods. The service is designed to help firms manage a wide range of tax return types while continuing to use their preferred tax software and existing workflows. Its role within the broader Thomson Reuters ecosystem gives firms access to tax preparation support that connects with commonly used tax technology platforms.

A practical aspect of the service is its focus on flexibility. Firms can use outsourcing to handle workload fluctuations without expanding internal teams, whether they need support for individual returns, business returns, or trust-related filings. Data protection is another area of focus, with security frameworks and compliance standards forming part of the operating model.

Key Highlights

• Provides outsourced tax preparation support for accounting and tax firms
• Supports individual, fiduciary, and business tax returns
• Integrates with widely used tax software platforms
• Offers flexible capacity for seasonal and year-round workloads
• Includes onshore and offshore processing options
• Emphasizes security and regulatory compliance practices

Services

• Tax return preparation
• Business tax return support
• Individual tax return support
• Fiduciary tax return preparation
• Tax document processing
• Tax workflow support
• Tax software integration

Contact Information:

• Website: tax.thomsonreuters.com
• Facebook: www.facebook.com/thomsonreuters
• Twitter: x.com/thomsonreuters
• LinkedIn: www.linkedin.com/company/thomson-reuters
• Instagram: www.instagram.com/thomsonreuters
• Address: 6300 Interfirst Drive, Ann Arbor, Michigan 48108
• Phone: +1 800 968 0600

6. Auxis

Auxis approaches tax outsourcing from a broader finance and business operations perspective. The company works with organizations that manage tax obligations across multiple jurisdictions and supports a range of indirect tax activities that often require ongoing reporting, reconciliation, and compliance management. Tax preparation forms part of a wider effort to streamline finance operations and reduce administrative workloads.

Much of the discussion around tax outsourcing at Auxis centers on VAT, sales tax, GST, and other indirect tax requirements. Their work often involves helping organizations handle recurring tax processes, reporting obligations, and tax-related data management. Automation, process improvement, and workflow standardization are common themes across their approach to tax operations. 

Key Highlights

• Supports organizations with indirect tax preparation and compliance activities
• Focuses on VAT, sales tax, GST, and local tax reporting
• Combines tax support with broader finance outsourcing services
• Uses process improvement and automation within tax workflows
• Assists businesses operating across multiple jurisdictions
• Supports recurring tax reporting and reconciliation tasks

Services

• VAT preparation and filing
• Sales tax support
• GST compliance services
• Tax reconciliations
• Indirect tax reporting
• Tax process management
• Tax compliance support

Contact Information:

• Website: www.auxis.com
• Facebook: www.facebook.com/AuxisConsulting
• Twitter: x.com/Auxis
• LinkedIn: www.linkedin.com/company/auxis
• Address: 301 International Parkway, Suite 200, Fort Lauderdale, FL 33323
• Phone: 954-236-4000

7. Unison Direct 

Unison Direct provides tax preparation outsourcing services primarily for CPA firms, accounting practices, and businesses seeking external tax support. The company covers a variety of tax-related areas, including personal taxation, business tax preparation, expat tax matters, and tax research. Its services are structured around assisting firms that need additional resources to manage tax workloads while maintaining filing accuracy and compliance.

The company's process includes document collection, data review, return preparation, and finalization, creating a workflow that fits into existing accounting operations. Alongside tax preparation, it offers support for planning, projections, and tax resolution matters, making its services relevant for firms handling different types of tax engagements throughout the year.

Key Highlights

• Supports CPA firms and businesses with outsourced tax preparation
• Covers personal, business, and expat tax requirements
• Includes tax research and tax projection services
• Follows a structured tax return preparation process
• Assists firms with compliance and filing obligations
• Supports a range of tax-related engagements beyond return preparation

Services

• Tax return preparation
• Expat tax services
• Personal tax support
• Small business tax preparation
• Tax research
• Tax projections
• Tax resolution services
• Sales tax return services

Contact Information:

• Website: unisondirect.com
• Email: hello@unisondirect.com
• Facebook: www.facebook.com/61581414938297
• LinkedIn: www.linkedin.com/company/unisondirect
• Instagram: www.instagram.com/unisondirect
• Address: 11555 Heron Bay Blvd., Suite 200, Coral Springs, Florida, 33076 USA
• Phone: +1 (407) 807 0100

8. CapActix

CapActix works with CPA firms, accounting firms, and tax professionals that need additional support during tax season and throughout the year. The company provides outsourced tax preparation services covering individual, partnership, and corporate tax returns. Its model is built around extending existing teams with external tax professionals who work within established processes and software environments.

One distinguishing aspect of CapActix is its focus on dedicated tax staffing and flexible team structures. Firms can scale support based on workload requirements while continuing to oversee client relationships and final approvals internally. The company also places emphasis on review procedures, secure document handling, and tax compliance throughout the preparation process.

Key Highlights

• Provides outsourced tax preparation support for CPA and accounting firms
• Covers individual, partnership, and corporate tax returns
• Offers dedicated tax professionals and scalable team models
• Supports firms during seasonal workload increases
• Uses structured review and quality control procedures
• Emphasizes secure document handling and compliance practices

Services

• Individual tax return preparation
• Partnership tax return preparation
• Corporate tax return preparation
• Multi-state tax support
• Tax review assistance
• E-filing support
• Tax compliance services
• Offshore tax preparation support

Contact Information:

• Website: www.capactix.com
• Email: biz@capactix.com
• Facebook: www.facebook.com/Capactix
• Twitter: x.com/CapActix
• LinkedIn: www.linkedin.com/company/capactix-business-solutions
• Instagram: www.instagram.com/capactixbusiness
• Address: 347 Fifth Avenue Suite 1402-227 New York, NY 10016
• Phone: +1 201-778-0509

9. Befree

Befree provides outsourced tax services for accounting firms, finance teams, and business owners managing ongoing tax compliance requirements. The company handles a range of tax return types, from individual and corporate filings to partnership, trust, estate, and indirect tax returns. Tax preparation is delivered alongside broader accounting and finance outsourcing services, allowing firms to centralize several operational functions with one provider.

Technology plays a visible role in their process, particularly for document handling, workflow management, and routine administrative tasks. Automation is used for activities such as data extraction and submission tracking, while tax professionals remain responsible for review, tax positions, and filing decisions. This combination of technology and human oversight is integrated throughout their tax service offering.

Key Highlights

• Supports accounting firms and businesses with outsourced tax preparation
• Covers corporate, individual, partnership, trust, and estate tax returns
• Includes indirect tax and VAT-related support
• Combines tax services with accounting outsourcing capabilities
• Uses automation for workflow and document processing tasks
• Provides support for ongoing tax compliance requirements

Services

• Corporate tax returns
• Individual tax returns
• Partnership tax returns
• Trust and estate tax returns
• VAT and sales tax support
• Tax compliance services
• Tax reporting
• Risk and compliance support

Contact Information:

• Website: befreeltd.com
• Email: info@befreeltd.com
• Facebook: www.facebook.com/people/Befree-Global/100088891985988
• Twitter: x.com/infobefreeltd
• LinkedIn: www.linkedin.com/company/befree-pty-ltd
• Instagram: www.instagram.com/befree_global
• Address: Gift House, 3rd Floor, Gift SEZ, Gift City, Gandhinagar, Gujarat 382355

10. Infinity Globus

Infinity Globus focuses on outsourced tax preparation for accounting firms that need additional support during tax season and throughout the year. The company covers a broad range of tax-related tasks, including return preparation, tax calculations, validations, and compliance activities for different entity types. Its services are geared toward firms looking to expand tax capacity without increasing internal administrative workloads.

A notable part of the offering is the variety of tax engagements covered under one service structure. Beyond standard tax returns, Infinity Globus handles sales tax compliance, tax assessments, and support for tax resolution matters. Security and compliance are emphasized through certifications and structured processes designed for handling sensitive financial information.

Key Highlights

• Supports accounting firms with outsourced tax preparation services
• Covers individual, corporate, partnership, nonprofit, estate, and trust tax returns
• Provides tax validation and tax liability calculation support
• Assists with sales tax compliance and reporting requirements
• Includes support for tax assessments and resolution matters
• Maintains information security and compliance certifications

Services

• Tax return preparation
• Tax calculations and validation
• Sales tax compliance
• Sales tax return filing
• Tax assessment support
• Tax resolution assistance
• IRS settlement support
• Multi-entity tax preparation

Contact Information:

• Website: www.infinity-globus.com
• Email: hello@infinity-globus.com
• Facebook: www.facebook.com/infinityglobus
• Twitter: x.com/infinityglobus
• LinkedIn: www.linkedin.com/company/infinityglobus
• Instagram: www.instagram.com/infinityglobus
• Address: 5005 Lyndon B. Johnson Freeway, Suite 1200, Dallas, TX 75244
• Phone: +1(754)-258-4994

11. Petterson & Bennett

Petterson & Bennett provides accounting, tax, payroll, and business support services for companies operating in Ukraine. Tax preparation is part of a wider accounting and compliance offering that helps businesses manage reporting obligations, maintain financial records, and meet local regulatory requirements. The company works with both legal entities and individuals that need assistance with tax-related matters.

The firm's tax services are closely connected with bookkeeping, management reporting, and financial control functions. This creates a practical setup for businesses that want accounting and tax responsibilities handled within the same service framework. In addition to tax preparation, support extends to business registration, payroll administration, and legal consulting.

Key Highlights

• Provides tax preparation and accounting support in Ukraine
• Assists both businesses and individual taxpayers
• Combines tax services with bookkeeping and compliance functions
• Supports local reporting and regulatory requirements
• Offers payroll, HR, and financial control services
• Includes tax and legal consulting as part of its service portfolio

Services

• Tax return preparation
• Tax consulting
• Legal consulting
• Bookkeeping
• Management reporting
• Payroll administration
• Internal audit support
• Business registration services

Contact Information:

• Website: accounting-outsourcing.com.ua
• Email: info@petterson-bennett.com
• Address: 3281 E. Guasti Rd., Suite 700, Ontario, CA 91761 USA
• Phone: +001 (213) 293-3344

12. Aone Outsourcing

Aone Outsourcing offers tax return preparation support for accounting firms, CPAs, and tax professionals seeking external assistance with recurring tax workloads. The company is involved in preparing different types of tax returns and related documentation, helping firms manage filing obligations while maintaining established internal processes. Its tax services sit alongside a broader range of accounting and bookkeeping solutions.

Many firms use outsourced tax support to handle workload fluctuations, and Aone Outsourcing positions its services around that need. The company's tax-related activities cover preparation, documentation review, and compliance-focused tasks that fit into existing accounting workflows. This allows firms to maintain continuity during busy periods without building additional in-house capacity.

Key Highlights

• Supports accounting firms with outsourced tax preparation
• Assists with tax return processing and documentation
• Serves CPAs, accounting firms, and tax professionals
• Combines tax support with accounting and bookkeeping services
• Helps manage seasonal tax workloads
• Focuses on compliance-oriented tax processes

Services

• Tax return preparation
• Tax documentation support
• Bookkeeping
• Accounting support
• Tax compliance assistance
• Financial reporting support

Contact Information:

• Website: www.aoneoutsourcing.com
• Email: info@aoneoutsourcing.com
• Facebook: www.facebook.com/aoneoutsourcingsolution
• Twitter: x.com/Aoneoutsource
• LinkedIn: www.linkedin.com/company/aone-outsourcing-solutions-pvt-ltd
• Instagram: www.instagram.com/aoneoutsourcing
• Address: 1311 Park St, Alameda, CA 94501, United States
• Phone: +1 6627565448

13. Stellaripe

Stellaripe provides tax outsourcing services for accounting practices across the UK. The company supports accountants with the preparation and filing of personal and corporate tax returns, helping firms manage deadlines and ongoing compliance requirements. Its tax services are designed to fit alongside digital accounting processes, including Making Tax Digital requirements.

One aspect that gives the company a distinct position is its involvement in both compliance and planning-related work. Along with return preparation, the service scope includes tax forecasting, capital gains calculations, property tax matters, and support for research and development claims. This creates a broader tax support function for firms handling different client needs.

Key Highlights

• Supports UK accounting practices with outsourced tax services
• Assists with personal and corporate tax returns
• Handles online tax filing with HMRC
• Supports Making Tax Digital requirements
• Provides tax forecasting and planning support
• Covers capital gains and property tax calculations

Services

• Corporation tax returns
• Personal tax returns
• Partnership tax returns
• Tax filing support
• Capital gains tax calculations
• Property tax calculations
• Tax forecasting
• R&D claim support

Contact Information:

• Website: stellaripe.co.uk
• Email: contact@stellaripe.co.uk
• Facebook: www.facebook.com/stellaripe
• Twitter: x.com/stellaripe
• LinkedIn: www.linkedin.com/company/stellaripe
• Instagram: www.instagram.com/stellaripe_
• Address: Office 43 Hideaway Work space, 1 Empire Mews, London SW16 2BF
• Phone: +44 20 3475 3537

14. CRSP Connect

CRSP Connect provides outsourced tax preparation services for businesses, CPAs, and Enrolled Agents looking for support with tax compliance and filing activities. The company covers business, personal, payroll, and sales tax requirements, helping clients manage different reporting obligations through a single service provider. Tax preparation is delivered alongside accounting, bookkeeping, and payroll services.

What stands out is the mix of tax preparation and operational support aimed at accounting firms. Alongside preparing returns, the company assists firms that need extra resources during tax season while continuing to manage client-facing responsibilities internally. The scope covers several common tax forms and filing requirements used by businesses and individual taxpayers.

Key Highlights

• Provides outsourced tax preparation for businesses and tax firms
• Supports CPAs and Enrolled Agents during tax season
• Covers business, personal, payroll, and sales tax requirements
• Combines tax services with accounting and bookkeeping support
• Assists with tax compliance and filing obligations
• Supports firms managing increased seasonal workloads

Services

• Business tax return preparation
• Personal tax return preparation
• Payroll tax preparation
• Sales and use tax returns
• Tax compliance support
• Accounting services
• Bookkeeping services

Contact Information:

• Website: crspconnect.com
• Email: contact@crspconnect.com
• Facebook: www.facebook.com/CrspConnect.LLC
• Instagram: www.instagram.com/crsp_connect
• Address: 146 W 29th St, STE 10W, New York, NY 10001
• Phone: +1 (631) 672-5934

15. Pacific Accounting & Business Services (PABS)

Pacific Accounting & Business Services provides outsourced tax preparation support for tax professionals, accounting firms, and enrolled agents across the United States. The company assists with individual, corporate, partnership, fiduciary, estate, and nonprofit tax returns, allowing firms to extend capacity during periods of increased demand. Its services are integrated with a wide range of tax and accounting software platforms.

Process consistency and workflow alignment are recurring themes throughout the company's tax outsourcing approach. Preparation tasks are carried out within client-preferred systems, while review procedures and security controls are incorporated into the overall process. The service model is designed to fit firms with varying workload levels throughout the year.

Key Highlights

• Supports tax professionals and accounting firms with outsourced tax preparation
• Covers individual, corporate, partnership, estate, fiduciary, and nonprofit tax returns
• Works within client-preferred tax software environments
• Supports seasonal and year-round tax workloads
• Incorporates structured review and security procedures
• Provides scalable tax preparation support

Services

• Individual tax return preparation
• Corporate tax return preparation
• Partnership tax returns
• Fiduciary tax returns
• Estate and gift tax returns
• Nonprofit tax returns
• Multi-state tax support

Contact Information:

• Website: www.pacificabs.com
• Email: info@pacificabs.com
• Facebook: www.facebook.com/pacificabs
• Twitter: x.com/PacificABS
• LinkedIn: www.linkedin.com/company/pacific-accounting-&-business-services-inc-
• Address: 5000 Riverside Drive Building 6, Suite 100E Irving, TX 75039 
• Phone: +1 (888) 837 3714

16. Global FPO

Global FPO delivers outsourced taxation services for accounting professionals, CPA firms, bookkeepers, and advisory practices across the UK and Europe. The company uses a Build Your Own Team model, allowing firms to create dedicated tax support teams based on their operational requirements. Tax preparation services are combined with filing support, compliance activities, and audit-related assistance.

The structure of the service places a strong focus on flexibility, giving firms access to professionals with different levels of experience depending on workload and complexity. Alongside tax preparation, Global FPO incorporates workflow management, review processes, technology support, and ongoing compliance functions that help firms maintain organized tax operations.

Key Highlights

• Provides outsourced taxation services for UK and European accounting professionals
• Uses a Build Your Own Team engagement model
• Supports tax preparation, filing, and compliance activities
• Assists CPA firms, bookkeepers, and accounting consultants
• Incorporates structured review and quality control procedures
• Uses various tax software platforms and digital tools

Services

• Tax preparation
• Tax filing support
• Tax compliance services
• HMRC reporting support
• Audit support
• Tax workflow management
• Tax accounting services
• Dedicated tax team support

Contact Information:

• Website: www.globalfpo.com
• Email: contact@globalfpo.com
• Facebook: www.facebook.com/globalfpoofficial
• Twitter: x.com/global_fpo
• LinkedIn: www.linkedin.com/company/globalfpo
• Address: Corporate Suite 44, First Floor Omaxe Square, Jasola, New Delhi-110025, India
• Phone: +1 (347) 781-5928

Conclusion

Tax preparation outsourcing has become a practical option for accounting firms, CPA practices, and tax professionals looking to manage growing workloads without expanding their internal teams. As the companies in this list show, outsourcing providers can support a wide range of needs, from individual and business tax returns to bookkeeping, compliance, audit support, and broader back-office functions.

Not every provider takes the same approach. Some focus primarily on tax return preparation, while others combine tax services with accounting, payroll, staffing, or finance operations support. The right fit often depends on the type of clients a firm serves, the complexity of its tax work, and how much support is needed throughout the year.

Whether a firm is preparing for a busy filing season or looking for ongoing operational support, the tax preparation outsourcing companies featured above represent different models, service offerings, and areas of specialization within the industry. Reviewing their capabilities, service scope, and experience can help firms better understand the options available in today's outsourcing market.