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Internal Revenue Bulletin:  2007-23 

June 4, 2007 



The taxpayer must retain adequate documentation to support the statistical application, sample unit findings, and all aspects of the sample plan and execution. The execution of the sample must include information for each of the following items:

1. The seed or starting point of the random numbers;

2. The pairing of random numbers to the frame along with supporting information to retrace the process;

3. List of sampling units selected and the results of the evaluation of each unit;

4. Supporting documentation such as notes, invoices, purchase orders, and project descriptions that support the conclusion reached about each sample item;

5. The calculation of the projected estimate(s) to the population, including computation of the standard error of the estimate(s);

6. A statement describing any slips or blemishes in the execution of the sampling procedure and any pertinent decision rules; and

7. Computation of all associated adjustments.

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