Which type of income typically has no effect on Social Security taxes?

Non-taxable inheritances are the type of income that typically has no effect on Social Security taxes. This is because Social Security taxes are primarily levied on earned income, such as wages or salary from employment, which directly contribute to an individual's Social Security account. Non-taxable inheritances, however, are not considered earned income and thus do not factor into the calculation of Social Security taxes.

In contrast, taxable interest income and investment income, while they may not be subject to the same Social Security tax as wages, might still impact an individual's overall tax situation, but they do not count towards earnings for Social Security purposes. Salary from employment directly contributes to Social Security taxes as it is subject to withholding. Therefore, the nature of inheritances being non-taxable categorically exempts them from Social Security tax considerations.