Objective: The internal audit report is a critical communication link between the internal audit function and corporate governance bodies, including the audit committee, executive management, and the board of directors. Despite its strategic importance for audit effectiveness and organizational health, no comprehensive and systematic research has holistically addressed its quality dimensions, components, and indicators. A review of the literature reveals three fundamental gaps: fragmentation among existing research perspectives, the absence of a unified framework for measuring report quality, and the neglect of diverse stakeholder expectations in content development. To address these gaps, this study aims to provide a systematic framework for explaining the dimensions, components, and indicators of internal audit report quality in Iran.

Methodology: This developmental-applied research employed a systematic literature review. A comprehensive search was conducted across major databases, including Scopus, Web of Science, ScienceDirect, Emerald, Google Scholar, Wiley, ProQuest, the IIA website, SID, Magiran, and Civilica, covering January 2000 to December 2025. The search strategy used Persian and English keywords such as "internal audit report," "internal audit reporting," "audit reporting quality," and "improving audit communication." To ensure rigor, the review protocol was based on the SPIDER framework, suitable for qualitative research on concepts and indicators. The initial search identified 1,274 articles. After title and keyword screening, 1,093 unrelated articles were removed. Subsequently, 181 articles were reviewed at the abstract level, excluding 113. The full texts of 68 articles were thoroughly evaluated, leading to the exclusion of 17 sources due to unavailability, exclusive focus on process quality without addressing report characteristics, lack of objective indicators, content duplication, or lack of credibility. Ultimately, 51 eligible sources—including 44 research articles, 3 doctoral dissertations, and 2 reference books—were selected for final analysis. Given the qualitative nature of the extracted data and study heterogeneity, narrative synthesis was used to combine findings, supplemented by thematic analysis to enhance transparency and trustworthiness. The synthesis proceeded in three stages: a preliminary review described each study in terms of objectives, methodology, and key findings; open coding extracted every statement related to report quality and grouped similar codes into broader components; and finally, related components were aggregated into higher-level dimensions, forming the final multi-level conceptual framework.

Findings: The analysis revealed a comprehensive framework consisting of 51 indicators, 15 components, and four main dimensions. The first dimension, labeled "Qualitative Communication Characteristics," encompasses eight components. Accuracy and precision require content accuracy, precise vocabulary, numerical correctness, and traceable citation. Objectivity and impartiality demand reliance on factual evidence, immunity from relationships or pressures, and balanced presentation of relevant facts. Transparency and clarity involve logical flow, simple and unambiguous language, guiding headings, and sufficient supporting details. Conciseness means avoiding redundancy and repetition, focusing on key points, and summarizing without sacrificing completeness. Constructiveness entails a positive, professional, non-blaming tone; focus on practical solutions; forward-looking perspective; and balanced feedback on strengths and weaknesses. Completeness requires coverage of all audit objectives and areas, sufficient depth of analysis, mention of all significant considerations, and adaptation to audience needs. Timeliness involves appropriate timing based on issue importance, adherence to agreed deadlines, and currency of information. Readability and communicative effectiveness reduce cognitive load, enhance deep processing, and encourage stakeholder engagement and action.

The second dimension, "Structural Requirements," comprises two components. Mandatory content comprehensiveness includes stating objectives, scope, findings, priorities, recommendations, conclusions, and action plans; analyzing each finding based on criteria, conditions, root causes, impact, and priority; specifying responsible parties and deadlines; and disclosing scope limitations or non-compliance. Effective organization and formatting require adherence to organizational templates, logical hierarchical structure, clear information flow, and purposeful use of visual aids such as dashboards, heat maps, charts, and graphs.

The third dimension, "Stakeholder Alignment," includes two components. Audience appropriateness involves customizing detail levels and adjusting tone and language to the audience's knowledge and position. Professional balance and maintenance of role boundaries entail transparency regarding responsibility and limitations, providing advisory value without overstepping management prerogatives, maintaining independence by avoiding involvement in execution, and managing key stakeholder expectations.

The fourth dimension, "Informational and Strategic Value," consists of three components. Strategic focus on important issues requires intelligent prioritization to direct attention to high-impact areas and proportionality of analysis depth to issue significance. Relevance and entity specificity demand explicit linkage of findings to strategic objectives and risks, avoidance of clichés, and contextual, root-cause-driven analysis. Identification of macro trends involves horizontal integration of findings over time and across the organization, identifying and quantifying overarching patterns, and offering strategic, actionable recommendations at the macro level.

Conclusion: The proposed conceptual framework enables systematic assessment of internal audit report quality. It aligns with the IIA's mandatory professional standards and the classic Seven Cs of communication, while extending existing frameworks by incorporating two previously neglected dimensions: "Stakeholder Alignment" and "Informational and Strategic Value." However, empirical validation in the Iranian organizational context is essential before operational application. This framework serves as an initial theoretical basis for developing national internal audit reporting standards, designing measurement tools for future research, and revising internal audit practices in Iran.