Browse Costco Salaries by Job Title →. Costco employees earn $34,000 annually on average, or $16 per hour, which is 57% lower than the national salary average of $61,000 per year. According to our data, the highest paying job at Costco is a General Manager at $110,000 annually while the lowest paying job at Costco is a Cashier at $19,000 annually.