How do I find the average annual income for a specific job?

The average annual salary generally varies based on factors like education, occupation, industry, geographical location, and many more. There are various apps and websites that can help you find average annual income for a specific job.

LinkedIn:

LinkedIn Salary is a calculator that provides the median salary for jobs in specific locations throughout the U.S. It shows the median base salary as well as the median total compensation including benefits, bonuses, and more. You can filter your search by location, industry, years of experience, and more. Mostly, the jobs listed here are related to the corporate world which includes IT professionals, consulting, etc.

Indeed:

Indeed Salary Search allows you to search for salaries by job title and compare salaries for similar jobs at different companies and different locations. Also, it provides information on typical benefits, plus career advice and job listings. 

Glassdoor:

Glassdoor's Know Your Worth tool provides a free, personalized salary estimate based on the current job market. Additionally, it provides information about your company, job title, location, and years of experience. Moreover, it has reviews from the employees themselves stating their experience working for that company. Finally, the tool will then tell you if you are being paid below or above your market value.

U.S Bureau of Labor Statistics:

The Bureau of Labor will give detailed information about all occupations including the corporate world, farming, healthcare, fishing, construction, transportation, etc in the US. Also, it provides information about median and average wage, and the hourly and annual 10th, 25th, 75th, and 90th percentile wages.