Internal controls for startups are the approvals, reconciliations, access limits and reviews that keep the books reliable once the company outgrows a founder checking every payment. Before a first audit, a scale-up needs a short set of documented key controls over the close, revenue, cash and system access, built on the COSO framework and sized to the team.
This SOX-lite approach borrows the structure of a public company program without its full testing burden. It covers how to design internal controls for startups, which controls auditors look at first under the current risk assessment standard, and when the Sarbanes-Oxley Act's Section 404 rules start to apply.
A private company is outside Section 404 of the Sarbanes-Oxley Act. The pressure to build controls comes from somewhere else: a lender covenant asking for audited statements, a Series B investor, a large customer's vendor review or an acquirer's diligence team. Our article on the value of voluntary audits explains how an audit builds trust with lenders and investors.
SOX-lite is a working label for a scaled program with four parts:
The aim is evidence. A company that later files with the SEC starts its Section 404 work from documents it already has.
Most US companies describe their internal control against the Committee of Sponsoring Organizations of the Treadway Commission (COSO) Internal Control - Integrated Framework, which COSO refreshed in 2013. Public companies have to name the framework they use in management's report under SEC Regulation S-K Item 308, so picking COSO early saves a later rewrite.
The US Government Accountability Office's Green Book adapts the COSO principles for government and sets out the same structure of five components and 17 principles. The five components, with what each means for a startup finance team, are below.
| COSO component | What it looks like at a scale-up |
|---|---|
| Control environment | Board or audit committee oversight, a written delegation of authority, a code of conduct that finance and IT staff acknowledge each year |
| Risk assessment | A yearly list of the accounts and processes where a material error is most likely, refreshed when the business model changes |
| Control activities | Approvals, reconciliations, segregation of duties, system access rules and review of journal entries |
| Information and communication | A chart of accounts and accounting policy manual, plus clear handoffs between sales, billing and finance |
| Monitoring | Quarterly self-testing, management review of results and tracked remediation |
A one-page table linking each key control to a component is usually enough for a first audit.
The controls below are the ones first-year auditors most often ask about. Each should have a named owner and a place where its evidence lives. If your audit team is likely to raise findings, our list of common audit issues for small businesses shows how those findings usually read.
The Green Book describes segregation of duties as separating "the responsibilities for authorizing transactions, processing and recording them, reviewing the transactions, and handling any related assets so that no one individual controls all key aspects of a transaction or event." It also says that where segregation is not practical "because of limited personnel or other factors, management designs alternative control activities to mitigate the risk of fraud, waste, or abuse in the business process."
That second point matters for a five-person finance team. Where one person must both create vendors and release payments, a monthly review of the vendor master change log and the payment register by the CFO or a board member is a reasonable compensating control. The table below shows a split for a small team.
| Activity | Prepares | Approves or releases | Reviews after the fact |
|---|---|---|---|
| Vendor creation and bank detail changes | AP specialist | Controller (with call-back to vendor) | CFO, monthly change log |
| Payment runs | AP specialist | CFO releases bank file | Controller, bank reconciliation |
| Manual journal entries | Staff accountant | Controller | CFO, monthly JE log |
| Customer credit memos | Billing specialist | Controller | CFO, monthly credit memo report |
| Payroll changes | HR or people ops | Payroll lead | Controller, payroll register tie-out |
The close is where most first-audit adjustments come from. Key controls include:
Revenue is usually the largest account on the income statement and involves judgment on contract terms, so it tends to draw the most audit testing. Useful controls are:
Auditors rely on reports from the ERP, billing, payroll and banking systems, so they look at who can change those systems and the data inside them. A SOX-lite set of IT general controls covers:
If you rely on a payroll provider or a cloud billing platform, ask for its service organization report. Our guide to SOC 1 vs SOC 2 audits explains which report an auditor will want to see.
Vendor bank detail changes need independent verification by phone, and payment releases need a second approver. Corporate card spend should be reviewed monthly by someone other than the cardholder. Payroll needs a gross-to-net review before release and a reconciliation of payroll expense and liabilities to the general ledger after each run. Our piece on small business fraud prevention covers the payment fraud schemes these controls stop.
A private company's financial statement audit follows AICPA generally accepted auditing standards, explained in our guide to GAAS standards. Statement on Auditing Standards No. 145 rewrote the risk assessment standard within GAAS. According to the Journal of Accountancy, it "takes effect for audits of financial statements for periods ending on or after Dec. 15, 2023," so audits of 2025 and 2026 year ends fall under it.
The Journal of Accountancy summary lists three changes that bear directly on a startup's controls.
First, SAS 145 "includes a new requirement to separately assess inherent risk and control risk."
Second, it is designed to enhance the requirements for assessing the risks of material misstatement, "particularly the areas of understanding the entity's system of internal control and assessing control risk."
Third, it "includes extensive guidance regarding the use of information technology and the consideration of general IT controls."
The practical takeaway for a startup is to have its controls written down and its evidence stored before fieldwork, including access review records and change tickets for the billing system and ERP.
The auditor's view of materiality drives how much of this testing happens. Our article on materiality and risk in audits explains how that threshold is set.
Section 404 applies only to SEC issuers. Under 15 U.S.C. 7262, Section 404(a) requires each annual report to contain an internal control report that states "the responsibility of management for establishing and maintaining an adequate internal control structure and procedures for financial reporting" and assesses its effectiveness at fiscal year end. Section 404(b) requires the outside auditor to attest to that assessment. The statute excludes emerging growth companies from 404(b), and 404(c) exempts issuers that are neither accelerated nor large accelerated filers.
Filer status depends on public float and revenue. Our comparison of internal vs external audits walks through the accelerated filer test with worked numbers.
Two further rules give a newly public company time:
The company below is illustrative. It completes an IPO in June 2028 as an emerging growth company with a December 31 fiscal year end.
| Report | Fiscal year | 404(a) management report | 404(b) auditor attestation |
|---|---|---|---|
| First 10-K | 2028 | Not required (transition statement) | Not required |
| Second 10-K | 2029 | Required | Not required while an EGC |
| Third to sixth 10-Ks | 2030 to 2033 | Required | Not required while an EGC; status ends earlier if revenue reaches $1.235 billion, more than $1 billion of non-convertible debt is issued in three years or the company becomes a large accelerated filer |
| Later 10-Ks | 2034 onward | Required | Required if the company is an accelerated or large accelerated filer |
Under 15 U.S.C. 77b(a)(19), EGC status ends no later than "the last day of the fiscal year of the issuer following the fifth anniversary" of the IPO. The fifth anniversary falls in June 2033, so the last possible EGC year ends December 31, 2033.
Management's first assessment covers December 31, 2029, about 18 months after the IPO. Controls need to operate for long enough before that date to be tested, so documentation and pilot testing should be finished before the listing.
A finance team can put a SOX-lite set in place within one quarter. A workable order:
In the following quarter, test every occurrence. Ten monthly controls tested for each of three months gives 10 x 3 = 30 test items. If two of the ten are quarterly controls, such as the access review, the count is 8 x 3 + 2 x 1 = 26 items.
| Control ID | Process | Frequency | Samples per quarter | Result | Remediation owner |
|---|---|---|---|---|---|
| C-01 | Bank reconciliation | Monthly | 3 | Pass | n/a |
| R-02 | Revenue schedule review | Monthly | 3 | Fail (one month unsigned) | Controller |
| IT-01 | Quarterly access review | Quarterly | 1 | Pass | n/a |
Our guide to internal controls testing for small businesses covers sample sizes, test steps and how to document results in more depth. When the audit date is set, the PBC request list for first-time audits shows what the auditor will ask for, and much of it will already sit in your control evidence folders.
In most scale-ups, the controller owns the control list and the evidence, while the CFO owns the risk assessment and reports to the board. Our comparison of a fractional controller vs a fractional CFO sets out who does what when those roles are part-time. When some close work is done by an outsourced or offshore team, keep preparer and approver roles separate, record each handoff with a ticket and link, and restrict bank portal and payroll access to named staff.
When should a startup start building internal controls? Start when an audit becomes likely within 12 months, usually because of a lender, investor or acquirer request. Controls need a few months of operation before the auditor can see evidence that they worked.
Do private companies have to comply with SOX 404? No. Section 404 applies to SEC issuers. Private companies follow it only where a contract, investor agreement or regulator requires similar controls, and many adopt a SOX-lite version to prepare for an audit or IPO.
What is the difference between COSO and SOX? SOX is a federal law that requires public companies to report on internal control over financial reporting. COSO is a framework that describes what effective internal control looks like, and most US public companies name the COSO 2013 framework in their Section 404 report.
Will a first-year auditor rely on our controls? That depends on the evidence available. As a general rule, an auditor who plans to rely on a control needs evidence that it operated over the period, which a new program may not have yet. SAS 145 enhanced the requirements for understanding the entity's system of internal control, so documented controls still help even when the auditor chooses detail testing.
How many key controls does a scale-up need? There is no required number in any standard or rule. As a rough rule of thumb only, a list of about 15 to 30 key controls across entity level, close, revenue, cash, payroll and IT access is often enough at this stage, and the right count depends on the company's risks and systems.
Madras Accountancy supports growing companies and their CPA firms with bookkeeping, month-end close, reconciliations and controller-level reporting, including documenting the controls and evidence an auditor will ask for. To talk through your controls before a first audit, contact our team.
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