Browse Firehouse Subs Salaries by Job Title →. Firehouse Subs employees earn $20,000 annually on average, or $10 per hour, which is 101% lower than the national salary average of $61,000 per year. According to our data, the highest paying job at Firehouse Subs is a General Manager at $35,000 annually while the lowest paying job at Firehouse Subs is a Shift Leader at $17,000 annually.