Discussion and Review of City of Tiffin FY 2025 Audit – BerganKDV

Report on Matters Identified as a Result of the Audit of the Basic Financial Statements Honorable Mayor and Members of the City Council City of Tiffin Tiffin, Iowa In planning and performing our audit of the financial statements of the governmental activities, business-type activities and each major fund of the City of Tiffin, as of and for the year ended June 30, 2025, in accordance with auditing standards generally accepted in the United States of America and the standards applicable to financial audits contained in Government Auditing Standards, issued by the Comptroller General of the United States, we considered the City's internal control over financial reporting (internal control) as a basis for designing audit procedures that are appropriate in the circumstances for the purpose of expressing our opinions on the basic financial statements, but not for the purpose of expressing an opinion on the effectiveness of the City's internal control. Accordingly, we do not express an opinion on the effectiveness of the City's internal control over financial reporting. Our consideration of internal control was for the limited purpose described in the preceding paragraph and was not designed to identify all deficiencies in internal control that might be material weaknesses or significant deficiencies and, therefore, material weaknesses or significant deficiencies may exist that have not been identified. In addition, because of inherent limitations in internal control, including the possibility of management override of controls, misstatements due to error, or fraud may occur and not be detected by such controls. However, as discussed below, we identified a certain deficiency in internal control that we consider to be a material weakness. A deficiency in internal control exists when the design or operation of a control does not allow management or employees, in the normal course of performing their assigned functions, to prevent, or detect and correct, misstatements on a timely basis. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the City's basic financial statements will not be prevented, or detected and corrected, on a timely basis. A reasonable possibility exists when the likelihood of an event occurring is either reasonably possible or probable as defined as follows: • Reasonably possible – the chance of the future event or events occurring is more than remote but less than likely. • Probable – the future event or events are likely to occur. The material weakness identified is stated within this letter. The accompanying memorandum also includes financial analysis provided as a basis for discussion. The matters discussed herein were considered by us during our audit and they do not modify the opinion expressed in our Independent Auditor's Report dated January 8, 2026, on such statements. 1