Aone Outsourcing provides outsource tax preparation services for U.S. CPA firms looking to handle more tax returns without expanding their in-house team. Our offshore tax professionals support individual and business returns, workpapers, schedules, extensions, and other agreed preparation tasks within your existing software and workflow. Add dedicated preparation capacity for busy seasons or year-round workloads and keep your team focused on review, client service, and higher-value tax work.
Get a Custom Tax Preparation PlanShare your workflow, software and accounting workload.
Tax preparation outsourcing allows CPA firms to delegate defined tax return preparation and supporting tasks to an external team while retaining professional oversight. Our team works within agreed procedures, software, documentation standards, and deadlines to prepare assigned tax work, helping firms add capacity without transferring client relationships or final professional responsibility to an outside provider. Tax preparation outsourcing can be structured around recurring, seasonal, or specialized preparation requirements.
Aone Outsourcing helps CPA firms manage tax preparation workloads that fluctuate throughout the year. Our offshore tax preparation team supports seasonal volume, recurring preparation work, additional return capacity, and time-consuming preparation tasks within your established software, procedures, deadlines, and review workflow.
During peak tax periods, Aone Outsourcing provides additional preparation capacity for increased return volumes and fixed filing deadlines. Our team handles assigned preparation work according to your procedures, helping your internal tax professionals manage seasonal workloads more efficiently.
For year-round workloads, our team handles recurring tax preparation activities across individual and business returns. Assigned work follows your firm's established procedures, documentation requirements, software, and turnaround expectations, providing consistent preparation support throughout the year.
When return volumes increase, Aone Outsourcing provides additional preparation resources without requiring your firm to expand every internal tax role. Capacity can be structured around agreed return volumes, preparation tasks, deadlines, software, and review requirements.
Our team supports defined preparation tasks that require substantial time from internal tax professionals, including workpapers, supporting schedules, extensions, data organization, and return preparation. Completed work is submitted through your established review process for professional assessment and final approval.
We provide a broad range of outsourced tax preparation support for U.S. CPA and accounting firms. Depending on the engagement, services include individual and business returns, federal and state preparation, extensions, amended returns, tax workpapers, supporting schedules, and IRS notice preparation. Each service follows the firm's agreed workflow, documentation standards, and review process.
Individual return preparation includes organized data entry, supporting schedules, calculations, and return assembly. Preparation follows the firm's instructions, tax software, documentation standards, and review procedures, with final professional responsibility remaining with the CPA firm.
Business return preparation covers agreed entity types, supporting schedules, financial information, and required tax data. The preparation team works within the firm's established procedures and software, preparing documentation for review while the CPA firm retains responsibility for professional judgments, client communication, and filing decisions.
Federal and state preparation include applicable returns, schedules, and supporting documentation within the agreed scope. Your firm provides applicable source information and requirements, while the preparation team follows established workflows and submits completed work for professional review and approval.
Tax extensions and amended returns create additional workload during already busy periods. The preparation team can handle agreed extension or amendment work, organize supporting information, and address revision notes so the firm's professionals can complete their review before final submission.
Well-organized tax workpapers help reviewers trace return entries back to supporting information. The team prepares schedules, organizes documentation, performs agreed calculations, and maintains files according to your firm's standards, making completed work easier for reviewers to examine and finalize.
Agreed preparation support can be provided for IRS notices and related tax documentation, including gathering information, organizing responses, and preparing supporting materials. Your firm's tax professionals remain responsible for technical conclusions, client communication, correspondence approval, and any final response submitted to authorities.
Aone Outsourcing provides outsourced tax preparation services for U.S. CPA firms across a range of individual, business, fiduciary, and international tax returns. The tax preparation outsourcing scope includes federal returns, information returns, foreign reporting forms, FBAR filings, and U.S. expatriate tax returns. The specific return types covered are aligned with your firm's requirements, tax software, and agreed preparation workflow.
We prepare Form 1040 returns for individual tax clients, along with applicable schedules, supporting information, and related workpapers required for the firm's review.
Eligible nonresident taxpayers with U.S. filing obligations are covered through Form 1040-NR preparation, including applicable schedules and supporting tax information within the agreed scope.
Aone Outsourcing handles Form 1120 preparation for C corporation clients, including the required return information, supporting schedules, and workpapers associated with the firm's preparation process.
Form 1120-S preparation supports S corporation clients with applicable schedules, shareholder information, supporting documentation, and related workpapers.
We prepare Form 1065 returns for partnership clients, covering applicable partnership information, schedules, supporting documentation, and workpapers required under the firm's workflow.
Form 1041 preparation covers estates and trusts, including applicable fiduciary schedules, supporting information, workpapers, and related return documentation.
We provide Form 1120-F preparation for foreign corporations with applicable U.S. filing requirements, along with the supporting schedules and documentation included in the agreed scope.
U.S. persons with applicable interests in foreign partnerships are supported through Form 8865 preparation, including associated schedules and supporting information required for the firm's review.
We handle Form 5471 preparation for applicable U.S. persons with interests in foreign corporations, including required schedules, supporting information, and related workpapers.
Form 5472 preparation covers applicable foreign-owned U.S. corporations and reportable related-party transactions, including the associated supporting information and schedules.
Aone Outsourcing provides FBAR preparation for applicable foreign financial account reporting requirements, including organization of account information and preparation of the required filing details.
CPA firms serving U.S. taxpayers with international tax requirements can use Aone Outsourcing for U.S. expatriate tax return preparation, covering applicable foreign income, financial accounts, investments, and related reporting requirements.
An offshore tax preparation model gives accounting firms access to additional preparation capacity without requiring every role to be staffed internally. Dedicated or scalable teams work within agreed systems, documentation standards, deadlines, and communication procedures while the CPA firm maintains client ownership, professional judgment, review responsibility, and final filing authority. This model allows firms to use outsource tax preparation services for both peak-season and ongoing workloads.
A dedicated offshore tax preparer works within your firm's established procedures, software, communication channels, and review workflow. This model provides consistent preparation capacity and familiarity with recurring clients while your firm determines scope, assignments, review standards, client relationships, and final approval.
Seasonal support gives CPA firms additional preparation capacity when return volumes increase around filing deadlines. Resources can be scaled for peak periods, helping firms manage workloads without permanently expanding internal headcount while maintaining established preparation, communication, and review procedures.
Our tax outsourcing services follow a structured process designed to fit your firm's existing tax workflow. We begin by understanding your return requirements, software, deadlines, and procedures, then establish secure access and responsibilities. The preparation team handles assigned work, completes quality checks, and submits returns for CPA review. Revisions are addressed before completed work moves to your firm's final approval and filing.
We review your return types, annual and seasonal volumes, complexity, filing deadlines, software, workpaper requirements, and current preparation procedures. This helps determine the appropriate scope, resources, turnaround expectations, and workflow for the engagement.
The engagement scope establishes which returns and preparation tasks will be handled externally. Responsibilities, documentation requirements, communication channels, turnaround times, review procedures, and escalation points are defined so both teams understand how work will move through the process.
Before preparation begins, approved access and document-transfer procedures are established. User permissions, software access, security requirements, file structures, naming conventions, and communication methods are configured according to your firm's requirements and the agreed engagement scope.
The preparation team receives the required source documents and completes assigned tax preparation tasks according to your firm's instructions. This may include data entry, calculations, schedules, workpapers, extensions, and return assembly using the agreed tax software.
Completed preparation work undergoes a structured quality check before being submitted to your firm. The team reviews available documentation, required schedules, preparation instructions, and agreed standards to identify missing information, inconsistencies, or preparation issues.
Completed returns and supporting workpapers are submitted to your firm's designated reviewers. CPA professionals review the preparation, assess technical positions, provide comments, and identify any additional information or corrections required before the return is finalized.
Review comments are returned through the agreed communication process and assigned revisions are addressed by the preparation team. Updated returns, schedules, and supporting documents are then returned to the firm's reviewers for confirmation and final approval.
Once the firm's review is complete, your professionals retain responsibility for final filing and client communication. Ongoing support continues for additional returns, amendments, extensions, workpapers, or future tax periods under the agreed outsourcing model.
Aone Outsourcing follows a structured quality-control process to review tax preparation work before submission to your firm. Our team checks assigned returns against available source documents, preparation instructions, required schedules, workpapers, and agreed procedures. Identified discrepancies, missing information, and preparation issues are addressed before completed work moves to your firm's review workflow.
The preparation team compares return information with available source documents and supporting records to identify missing data, inconsistencies, or incorrect entries. This review helps ensure assigned preparation work reflects the information provided by your firm.
Completed returns are reviewed against agreed preparation checklists and firm-specific requirements. The team checks applicable schedules, workpapers, required fields, and other defined preparation elements to identify items requiring correction or additional documentation.
Assigned preparation work undergoes internal quality checks before submission to your firm. The team reviews completed preparation against established procedures and engagement requirements, identifying potential errors or omissions before the work moves forward in the workflow.
When discrepancies, omissions, or preparation issues are identified, the preparation team addresses them before submission. Required corrections and rework are completed according to your firm's instructions and agreed procedures, helping deliver more complete and review- ready tax preparation work.
Tax preparation involves sensitive taxpayer, financial, and business information, making appropriate data protection an important part of the outsourcing workflow. Security procedures are aligned with your firm's requirements and engagement scope, with access and document handling limited to authorized personnel throughout preparation, review, revision, and delivery.
Data protection is incorporated into the tax preparation workflow from onboarding through completion. Access, document handling, and system permissions are structured around assigned responsibilities and aligned with your firm's security requirements and the agreed engagement scope.
Access to tax preparation systems and documents is restricted according to assigned responsibilities and approved user permissions. Named-user access, role-based permissions, and available security controls help limit access to information that is not required for an individual's assigned tasks.
Tax documents and supporting information are transferred through approved secure channels rather than unsecured communication methods. Document-handling procedures are established during onboarding and aligned with your firm's existing systems, requirements, and workflow.
Taxpayer and financial information is handled according to agreed confidentiality and engagement procedures. The preparation team follows defined instructions for receiving, processing, storing, and returning documents throughout the tax preparation engagement.
Access requirements are reviewed when responsibilities change or an engagement ends. Appropriate access-removal procedures help ensure that personnel no longer involved in an engagement do not retain unnecessary access to tax preparation information.
Document retention, storage, and disposal procedures are defined according to the engagement and applicable requirements. Firms can establish how source documents, workpapers, completed returns, and related information should be maintained throughout the service period.
Aone Outsourcing provides outsource tax preparation services to businesses across multiple industries, supporting CPA and accounting firms with industry-specific return preparation and related tax work. Our teams work according to your firm's documentation standards, tax software, deadlines, and review procedures
Consumer & RetailFinancial & Professional ServicesHospitality, Travel and EventReal Estate & ConstructionLogistics, Transport & TradeFranchiseWe use every leading tax preparation software to support CPA firms with outsource tax preparation services. Our teams work with platforms including ProConnect Tax, Drake Tax, Lacerte Tax, CCH Axcess Tax, CCH ProSystem fx Tax, UltraTax CS, GoSystem Tax RS, ProSeries, TaxSlayer Pro, and TaxAct Professional. Software support is based on the platform, version, access permissions, and specific requirements established for each engagement.
| Factor | Outsourced Tax Preparation | In-House Tax Preparation |
|---|---|---|
| Staffing | External preparation capacity is scaled according to workload | Capacity depends on internal staffing levels |
| Tax Season | Additional resources support peak-period demand | Existing staff may absorb higher seasonal volumes |
| Hiring | Provider manages preparation resources | Firm manages recruitment and hiring |
| Training | Provider manages agreed preparation training | Firm manages internal training |
| Scalability | Support is adjusted according to agreed requirements | Expansion may require additional hiring |
| Workflow | Operate within agreed software and procedures | Fully managed internally |
| Review | CPA firm retains review and final approval | Firm retains internal review |
| Client Relationship | CPA firm remains client-facing | CPA firm remains client-facing |
| Cost Structure | Depends on scope, volume, and engagement model | Includes payroll and associated employment costs |
Organizations that need additional preparation capacity can use outsourced support, particularly U.S. CPA and accounting firms. Depending on the engagement, support can also serve tax preparation practices, Enrolled Agents, tax professionals, and multi-office firms. Each engagement is structured around return volume, service scope, workflow, software, deadlines, and review requirements.
CPA firms can delegate defined preparation work while retaining client relationships, professional judgment, review responsibility, and final filing authority. Preparation capacity can support recurring or seasonal workloads within the firm's established procedures and agreed engagement scope.
Tax preparation firms can use external capacity to handle higher return volumes, seasonal demand, or specialized preparation tasks. The preparation team works within agreed workflows and software while the firm's professionals retain review and filing responsibility.
Enrolled Agents and other tax professionals can delegate defined preparation tasks while maintaining responsibility for professional review and client advice. Support includes return preparation, schedules, workpapers, and related tasks according to agreed procedures, deadlines, documentation requirements, and engagement scope.
The cost of outsource tax return preparation services depends on return type, complexity, volume, turnaround requirements, state filings, workpaper needs, software, and the selected engagement model. Dedicated teams, seasonal support, and per-return preparation can have different pricing structures. A customized scope and quote is developed based on your firm's actual workload and requirements, making pricing specific to the services, preparation volume, workflow, deadlines, and level of support required.
Book a MeetingAone Outsourcing provides outsource tax preparation services for U.S. CPA firms that need reliable preparation capacity without changing their established workflows. The offshore model combines dedicated tax professionals, scalable resources, structured quality checks, secure processing, and software integration to support individual and business tax workloads throughout the year.
The offshore tax preparation team gives CPA firms access to additional preparation capacity without expanding every tax role internally. Professionals work according to agreed procedures, documentation standards, software requirements, and deadlines, helping firms manage recurring and seasonal workloads efficiently.
Dedicated tax professionals become familiar with your firm's software, preparation procedures, documentation requirements, return types, and expectations. This familiarity supports consistency across recurring assignments and reduces the time required to explain established processes for each new engagement.
The preparation team works with your firm's established tax software, document systems, communication methods, preparation procedures, and review processes. Clearly defined responsibilities and document handoffs help outsourced work move smoothly between your internal team and the preparation team.
The preparation team works with your firm's established tax software, document systems, communication methods, preparation procedures, and review processes. Clearly defined responsibilities and document handoffs help outsourced work move smoothly between your internal team and the preparation team.
Completed returns are checked against available documentation, preparation instructions, required schedules, and agreed standards before being returned for professional review. Identified issues and review notes are addressed within the established workflow.
Tax preparation involves sensitive taxpayer and financial information, requiring appropriate data-handling procedures. Secure document transfer, controlled access, confidentiality procedures, and defined engagement requirements are incorporated into the preparation workflow.
Outsourced Tax Return Services can be structured around per-return, dedicated, seasonal, or year-round requirements. Each engagement defines return types, workload, turnaround expectations, software, documentation requirements, communication procedures, and review responsibilities.
The preparation team handles agreed tax preparation tasks while your CPA professionals focus on technical review, client service, and higher-value responsibilities. Completed returns, supporting schedules, and documentation are delivered through the agreed workflow for your team's review and next steps.
Aone Outsourcing's tax preparation team supports CPA and accounting firms with individual and business tax return preparation, workpapers, schedules, extensions, and related tasks. Our tax preparation experts work within your firm's established procedures, software, documentation standards, and deadlines, providing dedicated preparation capacity while your team manages review and final approval.
Get additional tax preparation capacity without expanding your in-house team. Talk to Aone Outsourcing about your return volume, deadlines, and preparation requirements.
Get a Custom Tax Preparation PlanShare your workflow, software and accounting workload.
Find answers to common questions about our outsourcing services
Yes. We offer white-label and outsourced tax return preparation services tailored to U.S. CPA firms. Our team is considered an extension of your company, assisting with handling large workloads during peak seasons, and is fully responsible for client reviews and communications.
Absolutely. Tax returns are prepared in accordance with current IRS regulations and federal and state tax laws. We also keep abreast of changes in regulations to ensure that all filings comply with the requirements and reduce the risk of penalties or audit issues.
Our tax returns include some of the most common, such as individual (Form 1040), partnership (Form 1065), corporation (Form 1120), S corporation (Form 1120S), and multi-state returns. We are equipped to assist with both simple and complex tax situations across different industries.
Yes. The size of our outsourced tax services is limitless, so you can handle large volumes of returns without slowing down or bringing on new staff. You need to have a handful of clients or a thousand filings; we can adapt quickly to your workload.
Our quality control process is organized into multiple levels, with each return being prepared and then checked by qualified professionals. This will provide accuracy, completeness, and compliance, greatly reducing the risk of errors, rework, or audit issues.
Yes. We are proactive in meeting filing deadlines, monitoring due dates, and making tax extensions where necessary. This will avoid stress at the end of the day, failure to meet the deadline, and potential punishment, resulting in a smooth, timely filing process.
Absolutely. We also offer full-service, including dealing with IRS notices, filing amendments, and addressing discrepancies. Our team guarantees that all corrections are completed professionally and accurately, and that there is a low risk of noncompliance and peace of mind.
documents, controlled access, and confidentiality agreements. All your client and financial information is secured at all levels, ensuring the highest standards of privacy and data protection.
Australia
UK
Ireland
Canada
.png)
