Lenders may be willing to remove family members from the residual calculations if a non-purchasing spouse or a working-age child has sufficient income to cover their monthly debts. This can include children who receive Social Security or disability income, child support and other forms of income, provided it’s likely to continue for at least three years.

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.
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