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Assurance services, attestation services, and non-assurance services differ in the level of confidence and verification they provide for users of information.Here's a summary of each category: 1.3.

Assurance services, attestation services, and non-assurance services differ in the level of confidence and verification they provide for users of information. Here’s a summary of each category:
1. Assurance Services
Assurance services are independent professional services that aim to enhance the quality of information for decision-makers by increasing its reliability and relevance. These services are broad in scope, often extending beyond traditional financial audits. They may involve evaluating the reliability of various information types or processes, whether financial or non-financial, to provide users with greater confidence in the data they rely on.
2. Attestation Services
Attestation services fall under assurance services, where CPA firms formally assess a subject matter or assertion made by another party and provide a report on its accuracy. This process involves examining whether the information meets specific standards and issuing an opinion or report. Examples of attestation services include audits of financial statements, reviews, and reports on internal controls. These services are commonly associated with financial and compliance aspects, where a formal opinion on accuracy is essential.
3. Non-Assurance Services
Non-assurance services do not involve issuing a report or opinion on the reliability of information. Instead, CPAs provide advisory services, tax preparation, and consulting, where they may offer guidance and support without formally verifying the information’s accuracy or relevance. Non-assurance services thus lack the independence and confidence level seen in assurance or attestation services, focusing instead on providing expertise and guidance rather than enhancing information quality.

The primary difference across these categories is the level of assurance provided—from high in assurance and attestation services to minimal in non-assurance services.