Ancillary income refers to any additional revenue generated by a business or individual that is not directly related to their primary source of income. This can include income from secondary services, products, or investments. It is often seen as a supplementary source of income that can help boost overall earnings and financial stability. Examples of ancillary income may include rental income, affiliate marketing commissions, or fees for additional services provided. In short, ancillary income is any form of income that is earned outside of one’s main occupation or business venture.