What Does a Controller Do? Responsibilities and Scope

A controller is the guardian of financial accuracy.

While bookkeepers record transactions and CFOs set strategy, controllers ensure the numbers are right. They own the integrity of your financial operations: the close process, the financial statements, the internal controls, and the compliance requirements.

This guide breaks down controller responsibilities in detail, contrasts the role with bookkeeper and CFO, and explains how the scope changes as companies grow.

Core Responsibility #1: Monthly Close Ownership

The monthly close is the controller's domain. They don't just participate in the close—they own it.

Close Calendar Management

• Create and maintain the close calendar with specific deadlines
• Assign tasks to team members with clear due dates
• Track progress and identify bottlenecks
• Escalate issues that threaten the close deadline

Close Activities

• Sub-ledger review: Ensure AP, AR, payroll, and other sub-ledgers are complete and accurate
• Adjusting entries: Prepare or review accruals, prepaids, depreciation, and other adjustments
• Account reconciliation: Reconcile all balance sheet accounts (or review staff reconciliations)
• Intercompany: Process and eliminate intercompany transactions (multi-entity)
• Journal entry review: Approve all journal entries, especially non-standard ones

Close Quality

• Perform analytical review of results vs. prior period and budget
• Investigate and explain significant variances
• Ensure no material errors remain uncorrected
• Document any significant estimates or judgments

Core Responsibility #2: Financial Statement Preparation

Controllers are responsible for producing accurate, complete financial statements that stakeholders can rely on.

Statement Preparation

• Income Statement (P&L): Revenue, expenses, and profitability by period
• Balance Sheet: Assets, liabilities, and equity at period-end
• Cash Flow Statement: Operating, investing, and financing cash flows
• Supporting schedules: Fixed assets, debt, equity roll-forward, etc.

Statement Quality

• Proper classification of accounts (operating vs. non-operating, current vs. non-current)
• Consistent presentation across periods
• GAAP compliance (if required)
• Clear and understandable format for intended audience

Management Reporting

Beyond GAAP statements, controllers often prepare management reports:

• Budget vs. actual analysis with variance explanations
• Departmental P&Ls
• Key performance indicators (KPIs)
• Flash reports for rapid visibility

Core Responsibility #3: Internal Controls

Controllers design and monitor the controls that protect your business from errors and fraud.

Control Design

• Segregation of duties: Separate authorization, custody, and recording functions
• Approval workflows: Define who can approve what, at what dollar thresholds
• Access controls: Limit system access to appropriate personnel
• Reconciliation procedures: Define what gets reconciled, how often, by whom

Control Monitoring

• Review that controls are operating as designed
• Investigate control exceptions or bypasses
• Update controls as the business changes
• Document control procedures for audit purposes

Key Controls Areas

• Cash/banking: Bank reconciliation, wire approval, check signing
• Accounts payable: Invoice approval, vendor setup, payment authorization
• Accounts receivable: Credit approval, collection procedures
• Payroll: Rate changes, new hire setup, payroll approval
• Inventory: Physical counts, adjustments, cost updates

For detailed guidance, see Internal Controls for Growing Businesses.

Core Responsibility #4: Compliance Oversight

Controllers ensure the company meets its financial compliance obligations.

Tax Compliance

• Sales tax: Nexus determination, registration, filing, remittance
• Payroll tax: Deposits, quarterly filings, W-2/W-3 preparation
• 1099 reporting: Vendor identification, form preparation, filing
• Property tax: Personal property declarations and payments

Note: Controllers coordinate with CPAs on income tax returns but don't typically prepare them.

Regulatory Compliance

• Business license renewals
• Industry-specific reporting requirements
• Government contract compliance (if applicable)
• Insurance certificate maintenance

Financial Compliance

• Loan covenants: Calculate and report compliance with lender requirements
• Investor reporting: Meet reporting obligations in shareholder agreements
• Grant compliance: Track and report on grant fund usage (if applicable)

Core Responsibility #5: Team Oversight

If you have accounting staff, controllers provide management and oversight.

Direct Supervision

• Assign work and set priorities
• Review and approve completed work
• Provide feedback and coaching
• Conduct performance evaluations

Training and Development

• Identify skill gaps and training needs
• Create training materials and procedures
• Support professional development
• Cross-train for backup coverage

Quality Assurance

• Review work product for accuracy
• Catch and correct errors before they propagate
• Establish quality standards and metrics
• Implement process improvements

Core Responsibility #6: Audit Coordination

Controllers are the primary point of contact for external auditors.

Audit Preparation

• Prepare PBC (Prepared by Client) schedules
• Gather supporting documentation
• Prepare management representations
• Document significant accounting policies and estimates

Audit Execution

• Respond to auditor inquiries
• Research accounting questions
• Provide access to records and personnel
• Review and comment on draft findings

Post-Audit

• Implement recommended improvements
• Address management letter comments
• Incorporate audit adjustments into books
• Plan improvements for next year's audit

Controller vs. Bookkeeper: Key Differences

Controllers are not senior bookkeepers. The roles require different skills and deliver different value.

Controller vs. CFO: Key Differences

Controllers are also not junior CFOs. The roles have fundamentally different orientations.

For a detailed comparison, see Controller vs. CFO: Different Roles, Different Value.