Keeping an accurate record of expenses and income is important for any business owner. However, accounting is not a skill everyone has (or enjoys.) Bookkeepers can integrate affiliate links into their packages, or work with a company like Xero, that has a partner program. Thought the details of these partner programs vary, often a service provider receives credit when a client signs up for an account and grants access to the service provider. Greencloud Bookkeeping features buttons on their services page showcasing their partner programs. You can learn more about becoming a bookkeeper here.
Residual income is the amount of net income generated in excess of the minimum rate of return. Residual income concepts have been used in a number of contexts, including as a measurement of internal corporate performance whereby a company's management team evaluates the return generated relative to the company's minimum required return. Alternatively, in personal finance, residual income is the level of income that an individual has after the deduction of all personal debts and expenses have been paid.