The cost of bookkeeping services for auto mechanics can vary depending on the complexity of the business and the extent of services needed. On average, small auto mechanic shops may pay between $200 to $500 per month for basic bookkeeping tasks. Larger businesses or those with more extensive financial needs may expect to pay upwards of $1,000 per month. The cost is influenced by factors such as the volume of transactions, the number of employees, and the level of financial reporting required.