Budget audit can adopt either comprehensive audit or sampling audit.
The main steps and purposes of audit sampling:
(1) Sample design: The sample design stage of audit sampling mainly includes the following steps:
1. Determine the test goals.
2. Define the population and sampling units, and the CPA should ensure the appropriateness and completeness of the population.
3. Define the conditions for error formation.
The purpose is to formulate a plan for selecting samples based on the test objectives and the sampling population.
(2) Sample selection
1. Determine the sample size.
2. Select samples.
3. Implement audit procedures on samples.
The purpose is to select the required samples from the corresponding sampling population according to appropriate methods and check them to determine whether there are errors.
(3) Evaluate sample results
1. Analyze sample errors.
2. Infer the overall error.
3. Form audit conclusions.
The purpose is to extrapolate the sample results to the population based on the analysis of the nature and causes of the error and form a conclusion about the population.
Comprehensive audit, also known as complete audit, refers to the audit of the authenticity, legality and effectiveness of all financial revenue and expenditures of the audited unit during the audit period.