Internal Controls Before the IPO: SOX Lessons for Growing Companies

Companies preparing to list, raise institutional capital or sell to a public acquirer eventually face the same question: can management prove its financial statements are reliable? For US-listed companies, the Sarbanes-Oxley Act turns that question into a formal requirement for internal control over financial reporting. Having led control design assessments, gap analyses and remediation for public companies, I advise growing businesses to start early.

Why start before you have to

Building controls under deadline pressure is expensive and disruptive. Building them as the company grows is cheaper, and it improves the quality of management information along the way. Investors notice the difference in due diligence.

Scope by risk

Start with the accounts and processes most likely to contain a material misstatement: revenue, cash, payroll, inventory, significant estimates and the financial close. Not every process needs the same depth of control.

Design the key controls

• Segregation of duties between initiating, approving and recording transactions.
• Account reconciliations, reviewed and evidenced every period.
• Review of journal entries, especially manual and late entries.
• Controls over estimates and judgments, with documented assumptions.
• IT general controls: access, change management and backups for financial systems.

Evidence everything

A control that is performed but not evidenced does not exist in the eyes of an auditor. Sign-offs, dates and support should be retained in a consistent format.

Test, find gaps, remediate

A dry-run assessment before external scrutiny reveals design gaps and operating failures while there is still time to fix them. Remediation plans should have owners and dates, and progress should be reported to the audit committee.

A practical timeline

18 to 24 months before an IPO or major transaction: assess current processes, identify significant accounts and document key flows: revenue, purchasing, payroll, treasury, financial close and IT general controls.

12 to 18 months before: design missing controls, assign owners and start operating them. Fix segregation of duties issues, often the hardest problem in smaller finance teams.

6 to 12 months before: test controls, remediate failures and retest. Prepare management's documentation as if an auditor will review it tomorrow.

Common deficiencies in growing companies

• Manual journal entries without independent review.
• Too many people with administrator access to the accounting system.
• Revenue recognised on contracts without documented review of terms.
• Reconciliations prepared late or without evidence of review.
• Spreadsheets used for key calculations without version control or checks.

Beyond compliance

Strong internal controls are not only for public companies. Private companies with good controls close their books faster, produce reliable numbers for lenders and investors, detect fraud earlier and command better valuations in a sale. Buyers and investors price uncertainty, and well-controlled finance functions remove a large part of it.

A leader's view: controls are a leadership choice

Internal controls are often treated as a finance department project. In reality, they reflect leadership choices about how the company operates. When executives override approval processes for urgent deals, bypass purchasing rules or tolerate late reconciliations, they signal that controls are optional. When they follow the same rules as everyone else, ask for evidence and reward people who raise problems, they build a control culture that auditors and investors can rely on.

The tone at the top matters most in growing companies, where informal practices that worked for a small team become risks as the business scales. A founder who approved every payment personally cannot do so at five hundred employees. Delegation of authority, segregation of duties and documented reviews replace personal oversight. Leaders who embrace this transition early avoid painful findings later.

Technology helps. Modern accounting systems enforce approval workflows, restrict access by role and keep audit trails automatically. Automated reconciliation and continuous monitoring reduce manual effort and catch errors faster. During my years at PwC, including work on Sarbanes-Oxley engagements, the companies that handled the transition best were those whose leaders saw controls as a foundation for growth, not a burden imposed by regulators.

The payoff

Strong controls are not just a filing requirement. They reduce fraud risk, speed up the close and give leadership numbers it can trust, whether the company is reporting under US GAAP or IFRS.

Common questions

What is SOX compliance?

SOX compliance refers to meeting the requirements of the Sarbanes-Oxley Act, including management's assessment of internal control over financial reporting and, for larger companies, an auditor's attestation.

Do private companies need SOX controls?

They are not legally required, but private companies preparing for an IPO, acquisition or institutional investment benefit greatly from building them early.