Search "top audit outsourcing companies" and you get a league table of brand names, most of them sorted by size, reach, or how many services they can stack on one page. For a US CPA or accounting firm, that is the wrong scorecard. When you outsource audit work, the engagement partner's name still goes on the opinion, so the question that matters is not which provider is biggest. It is which one lets you keep the judgment, the supervision, and the signature that your license depends on.
So the providers below are ranked on the criteria that decide it for a firm: whether they do genuine audit-support work, how the review and supervision stay with you, whether the opinion and independence never leave your firm, and whether you can test the work before a live engagement. Accountably is first because it is built for that exact buyer. The rest follow, each described from its own public materials, so you can match a model to your need instead of to a rank.
What audit outsourcing means for a CPA firm
Audit outsourcing gets used for two very different things, and the search results blur them together. One meaning is hiring an external firm to audit your company, the way a business engages a CPA firm to issue an opinion on its financial statements. The other, the one a CPA firm shops for, is offshoring the audit-support labor for the audits your own firm performs: the workpaper preparation, tie-outs, testing, and documentation that eat a junior's hours during a compressed season. The providers ranked here are for the second kind.
The reason a firm shops for that second kind is capacity. The median annual wage for accountants and auditors in the United States was $81,680 in May 2024, according to the U.S. Bureau of Labor Statistics, and an experienced auditor is both expensive to hire and slow to find in a tight market. Offshoring the support layer lets a firm clear more audit engagements in the same season without adding a permanent local seat for work that spikes and then subsides.
How we ranked these audit outsourcing companies
We score each provider on the axes the comparison table lays out: the delivery model, whether the work is genuine audit support rather than general bookkeeping relabeled, how the supervision and signoff stay inside your firm, and whether you can test the work before a live engagement. Those axes sort the field faster than any brand ranking, because they map onto the part of an audit a firm can never hand away. The itemized checklist to run on a shortlisted provider comes further down, under how to choose.
The table below places the providers on those criteria. Read it as a starting shortlist, not a verdict, because the right pick depends on whether your firm needs dedicated staff, a managed team, or overflow project support.
| Provider | Model | Audit-support focus | Supervision and signoff | Test before a live engagement |
|---|---|---|---|---|
| Accountably | Trained offshore audit-support staff placed inside US CPA, EA, and accounting firms | Built for firm workflows; work runs in your systems and review chain | You supervise directly; multi-layer review; the opinion and signature stay with your firm | Free 40-Hour Proof Pilot, graded by your own reviewer |
| QX Accounting Services | India-based dedicated outsourced audit-support service for CPA firms | Audit file roll-forward, tie-outs, lead schedules, compliance checks | You direct the provider-run team; the firm keeps the opinion | Discovery call, then a scoped paid pilot on sample files |
| CapActix Business Solutions | Ahmedabad-based outsourced audit support and staffing, flexible resourcing | Audit documentation, planning-file assembly, internal-control testing | You supervise the assigned staff; the firm signs | Scoped trial engagement you brief and review |
| Unison Globus | India-based outsourced accounting and audit support for CPA and EA firms | Audit support alongside accounting, tax, and payroll | You retain review and the opinion | Consultation, then a dedicated-team start you supervise |
| TOA Global | Philippines-based dedicated offshore staffing exclusively for accounting firms | Broad accounting-firm roles; audit support where a firm staffs for it | You manage the dedicated team; the firm keeps signoff | You interview and select the hire, then supervise |
| Entigrity | India- and Philippines-based offshore staffing for accounting and CPA firms | Places roles including audit associates | You supervise placed staff; the firm keeps the opinion | You interview candidates, trial the hire, then direct the work |
| AcoBloom | India-based audit-support outsourcing as an offshore extension of your team | Audit working papers, checklists, financial-statement review, file review | You direct and review the team; the firm keeps the opinion | Scoped audit-file trial, reviewed by your firm |
| Datamatics CPA | India-based audit and assurance support for US CPA and accounting firms | Audit documentation and tax-audit support across several models | You supervise the engagement; the firm keeps signoff | Scoped engagement; confirm the audit-support share first |
One column matters more than the rest. A provider that quietly absorbs the review, or that cannot show audit-specific competence before a live file moves, is not a saving. It is a slower, riskier version of the deadline you were trying to beat.
Accountably
Accountably places trained offshore accountants and audit-support staff inside US CPA, EA, and accounting firms, so the work runs in your own systems and your own review process rather than disappearing into a black box. Built by a CPA, it moves every file through a multi-layer review before it reaches you, and the engagement acceptance, the independence, the opinion, and the signature stay with your firm.
Controls are SOC 2-aligned, with zero local storage of your files. Since 2022 we have made 30+ placements across 20+ US firms. Because it embeds placed staff inside your own systems and review chain, your firm still directs, supervises, and reviews the work, so a firm that wants a fully hands-off, provider-owned deliverable with no supervision on its side is shopping for a different model.
The reason it leads this list for a firm is the proof step. Before a live, signature-bearing engagement moves offshore, run a Free 40-Hour Proof Pilot: a fixed 40-hour block of your own representative work, prepared in your systems and put through full multi-layer review, so your reviewer grades real output before a single client file is committed.
If a placement is not the right fit in the first 30 days, we replace them free under our 30-Day Fit Guarantee. Don't trust us. Test us. Run a Free 40-Hour Proof Pilot on your own workpapers and let your own reviewer grade the result.
QX Accounting Services
QX Accounting Services, part of QX Global Group, runs a dedicated, India-based outsourced audit-support service aimed at US CPA firms. Its offshore team works inside the firm's own audit software, rolling forward electronic audit files, performing casting and mathematical-accuracy checks, agreeing lead schedules to the final accounts, and preparing working papers, risk assessments, and substantive audit procedures for the firm's onshore reviewers.
It positions the team as an extension of the firm that interacts with audit clients on queries and reports errors back to the onshore reviewers. For a firm that wants a ready-made audit-support function rather than to build one, it is a substantial option, with the usual tradeoff that you are supervising a provider-run team rather than staff you selected yourself.
CapActix Business Solutions
CapActix Business Solutions is an offshore accounting and audit-support provider that works with US CPA and accounting firms. Based in Ahmedabad, India, its audit-support offering covers audit documentation, planning-file assembly, and internal-control testing. It runs a flexible resourcing model, so a firm can scale support up for a busy season and back down afterward. As with any provider-run team, the firm keeps the review and the opinion, and the value depends on how tightly the support work is briefed and checked.
Unison Globus
Unison Globus is an India-based outsourcing provider built for US CPAs, EAs, and accounting firms. Audit support sits alongside its core accounting, bookkeeping, payroll, and tax-preparation work, so a firm can consolidate several offshore needs with one partner. That breadth is the draw and also the caution: a generalist team can carry a firm's overflow, but a firm with heavy, specialized audit engagements should confirm the audit-specific experience of the people actually assigned to it.
TOA Global
TOA Global is an offshore staffing provider that works exclusively with accounting firms, on a dedicated-team model rather than project outsourcing. It delivers from the Philippines, with corporate offices in Australia and the United States.
Its focus is placing full-time offshore staff, trained on US firm workflows, across tax, client accounting services, bookkeeping, and controller work, with audit support available where a firm staffs for it. It suits a firm that wants its own dedicated people offshore and is prepared to manage them like an in-house team. A firm whose need is specifically audit-heavy should scope how much of the placement's time is genuine audit-support work.
Entigrity
Entigrity is an offshore staffing specialist for accounting and CPA firms, delivering from India and the Philippines and placing dedicated roles that range from bookkeepers and tax preparers to audit associates. Like other staffing-led providers, it hands the firm a person to supervise rather than a finished deliverable, which keeps control close but means the firm carries the direction and the review. It fits a firm that wants to add audit-support capacity as headcount it manages, on its own systems and standards.
AcoBloom
AcoBloom is an India-based provider that outsources audit support to US CPA and accounting firms as an offshore extension of their own teams. Its audit-support work covers preparing audit working papers, completing audit checklists, reviewing financial statements, and supporting the firm's file-review process, so onshore reviewers keep the judgment while routine documentation moves offshore. It suits a firm that wants an audit-focused support function rather than a general bookkeeping team, though a firm should still confirm the audit-specific experience of the people assigned and keep the review, the independence, and the opinion inside its own walls.
Datamatics CPA
Datamatics CPA is an India-based provider that gives US CPA and accounting firms audit and assurance support across several delivery models, including tax-audit support. It is among the most audit-specific of the offshore names a US firm is likely to shortlist for this work. A firm shopping specifically for embedded audit-support staff should confirm how much of an engagement is dedicated audit-file work versus a broader managed-service arrangement, and, as with any provider, keep the review and the opinion inside its own firm.
What outsourcing audit work does not outsource
Every provider on this list can take real work off your desk. None of them can take on the part of an audit that your license is actually about. Two professional-standards points decide that, and most rankings skip both.
Who stays responsible for supervising the work?
The firm that signs the opinion stays responsible for the work behind it, wherever that work is performed. For audits of public companies, PCAOB AS 1201 states that the engagement partner is responsible for the engagement and its performance, and for the proper supervision of the work of engagement team members, including engagement team members outside the engagement partner's firm.
Offshore support staff are exactly that, team members outside the firm. When the engagement partner seeks assistance, the standard says the partner still retains primary responsibility. Supervision can be shared. Responsibility cannot be shipped out.
Does outsourcing move the responsibility to the provider?
No. Under the AICPA Code of Professional Conduct, using an outside provider does not change who answers for the result. ET section 1.300.040 requires a member who uses a third-party service provider to make sure that provider has the professional qualifications and skills the work needs.
The firm remains responsible for the deliverable, and the provider's work should be directed, supervised, and reviewed the same as if a member of the firm had performed it, a point the AICPA restates in the Journal of Accountancy. Independence works the same way. The engagement's independence is the firm's to maintain, and a support provider preparing workpapers does not carry it.
Read the two together and the shortlist gets simpler. A provider is useful when it makes the support work faster and cleaner. It becomes a liability the moment it stands in for the judgment, the review, or the independence you cannot delegate.
How to choose an audit outsourcing partner
Once you know the model you want, five checks separate a partner you can defend from one you will spend the season fixing. Run them on any provider on this list, and on any that is not.
Score a provider against the five before you weigh its brand or its place on a list. A big name that fails check three is a worse choice than a smaller one that passes all five, because what you are managing is the safety of your own signature, not the provider's size.
Frequently asked questions
What are the top audit outsourcing companies for CPA firms?
For US CPA and accounting firms, the providers that come up most often are Accountably, QX Accounting Services, CapActix, Unison Globus, TOA Global, Entigrity, AcoBloom, and Datamatics CPA. They are not interchangeable: some place dedicated staff you supervise, others run a managed support team, and the audit-specific depth varies from one to the next. Rank them on whether they do genuine audit-support work, how the supervision and the opinion stay with you, and whether you can test the work first, rather than on brand size.
What is the difference between audit outsourcing and hiring an audit firm?
Hiring an audit firm means engaging an outside CPA firm to audit your company and issue an opinion on your financial statements. Audit outsourcing, in the sense a CPA firm shops for, means offshoring the support labor for the audits your own firm performs, such as workpaper preparation, testing, and documentation. In the first case, the outside firm owns the opinion. In the second, your firm keeps the opinion and the signature, and the provider works under your supervision.
Which audit outsourcing model fits a solo or small CPA firm?
For a solo or small firm, the deciding factor is usually whether your audit work is steady enough to keep a full-time person busy. A dedicated-staff model, a placed full-time seat you supervise like an in-house hire, suits a firm with a consistent audit book.
If your audit work spikes with the season and quiets down afterward, a managed or project-based support arrangement that scales up and back down tends to fit better, because it matches support to a workload that is not full-time year-round. Either way, keep the review and the opinion inside your own firm, and test the provider on a small block of your own work before you commit.
Is it safe to send audit work to an offshore provider?
Sending audit-support work offshore can be safe when the provider protects client files with encryption, access controls, and contractual confidentiality, and when your firm keeps the supervision and review that professional standards assign it. The data-security posture matters more than the distance. Ask how files are stored and accessed, whether staff are background-checked, and how the provider keeps one firm's data separate from another's.
Do you keep control of the audit opinion when you outsource?
Yes. Outsourcing audit-support work does not move the opinion, the independence, or the engagement partner's responsibility to the provider. The offshore team prepares and tests; your firm reviews the evidence, forms the judgment, and signs. If a provider ever implies it can take the opinion off your hands, treat that as a reason to walk, not a feature.
How much do audit outsourcing companies charge?
Pricing usually follows one of three shapes: a monthly rate per dedicated full-time person, an hourly rate for flexible support, or a fixed fee for a scoped project. Which one fits depends on whether your audit work is steady or spikes with the season. Audit support is specialized, review-heavy work, so it tends to sit at the higher end of whichever structure a provider quotes. Get the quote in writing against a defined scope before any live engagement moves.