How does GIPS handle error correction, and what determines whether an error is material enough to require restatement?

GIPS requires firms to correct errors in composite performance when discovered and, depending on materiality, may require restatement and disclosure to affected parties. The standards establish a framework for evaluating error significance and taking appropriate corrective action.\n\nError Correction Framework:\n\n1. Identify the error: Determine the nature (data input, calculation, composite assignment, etc.)\n2. Quantify the impact: Calculate the magnitude of the error on composite returns\n3. Assess materiality: Determine if the error is material based on the firm's error correction policies\n4. Correct the records: Fix the underlying data and recalculate returns\n5. Determine disclosure obligations: Based on materiality, decide whether external communication is needed\n\nMateriality Assessment:\n\nGIPS does not prescribe a specific numerical threshold. Each firm must establish its own materiality policy in writing. The policy should consider:\n\n| Factor | Consideration |\n|---|---|\n| Magnitude | A 40 bps error in a bond composite may be material; 40 bps in a volatile equity composite may not |\n| Duration | Error persisting across multiple periods is more material |\n| Direction | Does it change the composite's relative ranking? |\n| Client impact | Could it have affected investment decisions? |\n| Pattern | Systematic errors are more concerning than isolated ones |\n\nWorked Scenario:\n\nCompliance manager Wendell at Haverford Partners discovers three errors:\n\nError A: The small cap composite annual return was reported as 12.4% instead of the correct 11.9% (50 bps difference). This persisted for 18 months across client presentations and consultant databases.\n\nAssessment: Material. The error exceeds the firm's 25 bps materiality threshold, affected multiple reporting periods, and was distributed externally.\n\nAction required:\n- Correct all internal records\n- Restate the composite performance in the GIPS-compliant presentation\n- Notify all current clients and prospective clients who received the erroneous data\n- Notify consultant databases and verification firms\n- Document the error, cause, and remediation steps\n\nError B: A balanced composite quarterly return was 3.21% instead of the correct 3.18% (3 bps difference).\n\nAssessment: Not material under the firm's policy. Correct internal records but no external notification required.\n\nError C: A portfolio was incorrectly excluded from a composite for 6 months, changing the composite return by 15 bps.\n\nAssessment: Borderline. Even though the return impact is below threshold, the composite membership error is a structural violation. Wendell decides to treat it as material and restate.\n\nKey Requirements:\n- Firms must have written error correction policies\n- Material errors require corrected GIPS-compliant presentations\n- The corrected presentation must disclose the nature of the error\n- Prior period returns must be restated, not just prospectively corrected\n\nStudy GIPS compliance requirements in our CFA Ethics course.