Most published lists of audit firms in Singapore rank by revenue. If you run a small or mid-sized company, or a Singapore subsidiary of a multinational, revenue is the wrong sorting key. This guide ranks the decision around fit instead. It walks through the four tiers of audit firms in Singapore, shows when your company is actually required to be audited, explains what the main audit services cost, and maps each firm tier to the kind of company it serves best.
You will see the same four phrases over and over when you search for an auditor: best audit firm singapore, top audit firms in singapore, audit companies in singapore, and auditing firm singapore. They look like four different questions. They are mostly the same question asked by buyers at different stages. This article answers all four, then points you to the deeper article for each.
Audit firms in Singapore: the four tiers explained
The Singapore audit market is regulated by the Accounting and Corporate Regulatory Authority (ACRA). Only a Public Accountant registered with ACRA can sign a statutory audit opinion, and the firm must be an approved public accounting entity. That single rule sits underneath every tier below.
With that floor in place, the market sorts itself into four practical tiers.
1. The Big 4
Deloitte, EY, KPMG and PwC. They audit the listed companies, the large multinationals, and the regulated financial institutions. They carry the deepest specialist benches and the widest international network. They also carry the highest fees and, for a smaller client, the least partner time per dollar.
2. Mid-tier firms
Established public accounting entities with multiple partners and a full audit team, sitting below the Big 4 in headcount but holding the same ACRA registration and applying the same Singapore Standards on Auditing. This tier serves most SMEs and a growing share of MNC subsidiaries. AG (Ackenting Group) sits here. We cover this tier in depth in our guide to mid tier audit firms Singapore.
3. Boutique and specialist firms
Small firms, often one or two partners, focused on a niche such as charities, management corporations (MCST), or a single industry. Strong when your audit need matches their niche, thinner when it does not.
4. Sole practitioners
A single registered Public Accountant. The lowest cost and the most personal contact, but limited capacity when your group grows or your reporting deadlines tighten.
Why the tier matters more than the ranking: Every tier here works under the same ACRA registration and the same auditing standards. The audit opinion from a mid-tier firm carries the same legal weight as one from the Big 4. The difference you are buying is capacity, network reach, sector depth and price, not the validity of the opinion.
Audit firm or audit company: does the term matter?
People search for both audit companies in singapore and audit firms, and they mean the same thing. The precise legal term in Singapore is “public accounting entity,” the structure that ACRA approves to perform statutory audits. Whether you call it a firm, a company or a practice changes nothing about the registration or the standards it works under. So do not read anything into the label when you build a shortlist. Read the registration, the partner credentials and the track record instead. We work through the comparison in Audit Companies in Singapore: the buyer’s checklist.
When does your company actually need an audit?
Before you compare firms, confirm you are even required to be audited this year. Many small companies in Singapore are exempt and do not realise it.
A company is exempt from statutory audit if it qualifies as a small company. Under Section 205C read with the Thirteenth Schedule of the Companies Act, a private company qualifies as a small company if it meets at least two of these three criteria for the immediate past two consecutive financial years:
- Total annual revenue of S$10 million or less
- Total assets of S$10 million or less
- 50 employees or fewer
For a company inside a group, the whole group must meet at least two of the same three thresholds on a consolidated basis for the company to claim the small group exemption. These rules apply to financial years beginning on or after 1 July 2015.
Two points trip people up. First, qualifying as a small company removes the audit, not the obligation to prepare financial statements or file an annual return. Second, a newly incorporated company can qualify in its first year if it meets the criteria, because there is no two-year history to test yet. We work through every edge case in when is audit required in Singapore and the exemption detail in audit exemption for small companies.
If you are required to audit, the engagement has to fit your filing calendar. A non-listed company must hold its annual general meeting within six months after its financial year end and file its annual return within seven months after financial year end. Your audit has to finish with room to spare before those dates, which is why turnaround time belongs in your selection criteria, not just price.
What audit services Singapore firms typically offer
“Audit” is not one product. When three companies email us asking for “an audit,” they often need three different services. Here is the catalogue most full-service firms offer.
| Service | What it is | When you need it |
| Statutory audit | ACRA-mandated audit of financial statements, expressing an opinion under Singapore Standards on Auditing | Your company is not exempt, or a shareholder requires it |
| Internal audit | Review of internal controls, risk and governance, reporting to management or the board | You want assurance over how the business runs, not just the financial statements |
| Special-purpose audit | Audit for a specific purpose: M&A, a grant, a regulator | A bank, investor, grant body or regulator asks for it |
| Review engagement | Limited assurance, lighter than a full audit | You are exempt but a stakeholder wants some independent comfort |
| GST and other compliance audits | Targeted checks tied to a specific tax or licence | A regulator or scheme requires it |
We break down each of these, with scope and deliverables, in Singapore audit services. The distinction between statutory, external and internal work is where most confusion lives, so we also explain the difference between internal and external audit in plain language. For the engagement itself, AG is an audit firm in Singapore that handles statutory audit across a range of company types.
How to compare audit firms: the 7-criteria framework
Once you know you need an audit and which type, you can shortlist firms. Brand size is a weak predictor of fit. These seven criteria are stronger ones. We expand each into a scorecard in How to Screen, Score and Choose in 2026.
- ACRA registration and ISCA membership. Confirm the firm is an approved public accounting entity and that the signing partner is a registered Public Accountant. This is the non-negotiable floor.
- Sector experience. Has the firm audited companies in your industry, with its specific revenue recognition and inventory quirks?
- Partner involvement. Will a partner actually work on your file, or only sign it? On smaller engagements this is the single biggest quality signal.
- Fee transparency and scope clarity. A fixed fee against a defined scope beats an hourly estimate that drifts.
- Responsiveness during the cycle. Not just at the deadline. Audits slip in fieldwork when questions sit unanswered.
- Methodology and quality controls. Compliance with the Singapore Standards on Auditing and a real file review process, not a reference to standards on a brochure.
- Cultural fit with your finance team. You will spend several weeks working closely with these people. Friction here costs you deadline days.
Best audit firms in Singapore by company type
The honest version of “who is the best audit firm singapore has” depends on what kind of company is asking. There is no single ranking that fits a listed multinational and a five-person SME at the same time.
- Listed companies and large MNCs: the Big 4, whose scale, specialist benches and international network match the complexity.
- MNC subsidiaries in Singapore: increasingly a mid-tier firm, which delivers the same standard at a lower fee with more partner time. We cover this shift in best audit firms in Singapore for SMEs vs MNCs.
- SMEs and growth-stage companies: a mid-tier or boutique firm that knows the small-company exemption rules and can move quickly.
- Non-profits, charities and MCSTs: a firm with the specific niche experience, since these audits follow their own rules.
Top 10 audit firms in Singapore: ranking by specialism, not revenue
Most “top 10” lists are revenue league tables. They tell you who is biggest, not who is right for you. Our companion piece, Top 10 Audit Firms in Singapore: ranking by specialism, sorts firms by who they serve best rather than by headcount, and explains why the Big 4 do not appear in several of the categories. If you searched for top audit firms in singapore, that article is the one to read next.
Mid-tier vs Big 4: the cost and quality tradeoff
The reason the mid-tier exists is straightforward. The Big 4 charge Big 4 fees, which are built for large and complex audits. For an SME or a mid-sized subsidiary, that often means paying for capacity you do not use. A mid-tier firm applies the same Singapore Standards on Auditing and holds the same ACRA registration, usually at a lower fee and with a partner closer to your file.
Audit quality across firms is monitored by ACRA through its Practice Monitoring Programme (PMP). ACRA inspects audits of listed companies, while ISCA inspects audits of non-listed companies under ACRA’s oversight, checking compliance with the Singapore Standards on Auditing. That oversight applies to firms of every size, which is why a clean PMP outcome is a more useful quality signal than a firm’s revenue. We compare the two routes directly in mid tier audit firm in Singapore vs Big 4.
Internal vs external audit: which one are you actually buying?
A surprising number of buyers ask for “an audit” when they mean two different things. An external audit, including the statutory audit, is performed by an independent firm and produces an opinion on your financial statements for shareholders and regulators. An internal audit looks inward at controls, risk and process, and reports to your own management or board. One is about the numbers you publish, the other is about how the business runs.
Singapore law mandates only the external statutory audit, and only when you are not exempt. Internal audit is a governance choice. If this distinction is new to you, read what is the difference between internal and external audit, then the difference between statutory audit and internal audit for the Singapore-specific version.
Quality signals to look for in an audit firm
“Quality” is the most claimed and least defined word in audit marketing. These are signals you can actually check, rather than adjectives on a website:
- A clean outcome under ACRA’s Practice Monitoring Programme
- ISCA membership and current continuing professional education for the engagement team
- A sensible partner-to-staff ratio on your specific engagement
- Time budgeted for planning, not only fieldwork
- An independent file review before the opinion is signed
- A documented methodology, not just a reference to the standards
We turn these into eight verifiable markers in quality audit services Singapore.
What to expect from your auditor, week by week
If this is your first audit, the process can feel opaque. A typical SME statutory audit runs across roughly six to eight weeks. Knowing the stages helps you protect your filing deadline.
- Engagement and scoping. You sign an engagement letter that defines the scope and fee. A clear scope here prevents fee creep later.
- Planning and risk assessment. The auditor learns your business, identifies the risk areas, and sends a request list. The faster you return it, the smoother the rest runs.
- Fieldwork. The team tests transactions and balances and asks follow-up questions. This is where deadlines slip, because progress depends on your finance team answering queries quickly.
- Review and management letter. An independent reviewer checks the file, and the auditor raises any control observations in a management letter.
- Sign-off. The partner signs the opinion. You can then hold your AGM and file your annual return.
The single biggest driver of whether you hit your AGM date is how fast your finance team responds during fieldwork. We lay out the full timeline and the document checklist in auditing firm Singapore: how an auditor works with your business. If the word auditing firm singapore is what you typed into search, start there.
How much does an audit cost in Singapore?
There is no fixed price, because the fee depends on company size, the state of your records, your group structure and your industry. A clean set of books costs less to audit than records that need reconstruction first. The useful move is not to chase the lowest number, it is to control the pricing model: ask each firm for a fixed fee against a written scope rather than an open hourly rate.
As a published reference point for the mid-tier, AG’s fixed-fee statutory audit starts at S$5,000, with a sales (GTO) audit from S$800. We do not publish competitor fee ranges here, because we cannot verify them. Get a quote against your own scope, and compare firms like for like. The cost case between tiers is set out in mid tier audit firm in Singapore vs Big 4.
Common mistakes when hiring an audit firm
Four errors come up again and again with first-time and switching buyers.
- Buying an audit you do not need. Many small companies qualify for the audit exemption and pay for a statutory audit anyway. Confirm your status first.
- Sorting by brand size. The biggest name is the right answer for a listed multinational and an expensive mismatch for an SME.
- Accepting an open-ended fee. An hourly estimate with no scope can climb well past the figure you were quoted. Insist on a fixed fee against a written scope.
- Starting too late. Leaving the engagement until a month before the AGM compresses fieldwork and risks a late filing. Start the conversation early.
How AG (Ackenting Group) fits
AG is a Singapore mid-tier firm. Our auditors in Singapore are registered Public Accountants with ACRA. Managing Partner John Woo holds CA (Singapore), FCCA, ASEAN CPA and Accredited Tax Practitioner credentials, and Audit Partner Dax Teo brings Big 4 audit experience to the mid-tier file. The firm reports more than 1,000 clients and over 2,000 audit engagements since inception, and publishes a fixed-fee statutory audit starting at S$5,000.
Beyond our core audit services in Singapore, AG supports the financial reporting that an audit depends on. If your statements are not audit-ready, our financial reporting and statement preparation and accounting services for audit-ready financials close that gap, and our corporate tax services and GST services in Singapore keep the compliance calendar aligned.
Frequently asked questions
What is the best audit firm in Singapore?
There is no single best audit firm singapore can name for every company. The Big 4 fit listed and large multinational clients. Mid-tier firms such as AG fit most SMEs and MNC subsidiaries, applying the same Singapore Standards on Auditing at a lower fee with more partner involvement. “Best” is a fit assessment against the seven criteria above, not a revenue ranking.
How are top audit firms in Singapore usually ranked?
Most published rankings of top audit firms in singapore sort by revenue or headcount. That tells you who is biggest, not who is right for your company. We rank by specialism instead in Top 10 Audit Firms in Singapore.
Is there a difference between an audit firm and an audit company?
In everyday use, “audit companies in singapore” and “audit firms” mean the same thing: an ACRA-approved public accounting entity. The legal term is public accounting entity. We compare the labels in Audit Companies in Singapore: the buyer’s checklist.
Does my Singapore company need to be audited?
Only if you are not exempt. A private company that meets at least two of three small-company criteria (revenue of S$10 million or less, assets of S$10 million or less, 50 employees or fewer) for the past two consecutive financial years is exempt from statutory audit.
How long does a statutory audit take?
For a typical SME, plan for roughly six to eight weeks from engagement to sign-off, depending on the state of your records and how quickly your team answers fieldwork queries. AG works to a published 30-day completion KPI for qualifying engagements.
What is the deadline to file accounts after an audit?
A non-listed company must hold its AGM within six months after its financial year end and file its annual return within seven months after financial year end. Your audit needs to finish with room before those dates.
Can I switch audit firms?
Yes. There is no requirement to stay with the same firm, and many SMEs and subsidiaries switch to a mid-tier firm to lower fees and gain partner time. Plan the change between financial years and give your new firm your prior-year financial statements.
Choosing your audit partner
If you are comparing firms now, the fastest way to test fit is a scoping conversation: confirm you are required to audit, agree the scope, and get a fixed fee against it. Book a free audit scoping call with AG, or send an enquiry with your financial year end and we will tell you whether you are required to audit before any quote.
