Second, the taxpayer shall ascertain the percentage which the total compensation paid to employees for work done or for services performed within the city is of the total compensation paid to all the taxpayer's employees within and without the city during the period covered by the return. For allocation purposes, compensation shall be computed on the cash or accrual basis in accordance with the method used in computing the entire net income of the taxpayer.
If an employee performs services within and without the city, the following examples are not all inclusive but may serve as a guide for determining the amount to be treated as compensation for services performed within the city:
MCL 141.622