Supporting America's First Responders Act of 2019 This bill allows a deduction from gross income (above-the-line deduction) for expenses of first responders up to $500. Those expenses are for (1) tuition or fees for professional development courses related to service as a first responder, or (2) uniforms used by the first responder. The bill defines "first responder" as any individual who is a law enforcement officer, firefighter, paramedic, or emergency medical technician for at least 1,000 hours during the taxable year.