Which of the following is NOT considered a source of retirement income?

Mortgage payments are not considered a source of retirement income because they represent an obligation rather than an income-generating asset. Retirement income typically includes financial resources that provide cash flow during retirement, allowing individuals to maintain their standard of living without having to rely on employment.

Pensions, Social Security, and personal savings all contribute directly to a retiree's ability to generate income. Pensions provide regular payments based on past employment, Social Security offers monthly benefits based on earnings history, and personal savings may include various accounts or investments that can be withdrawn or distributed during retirement. In contrast, mortgage payments signify debt responsibilities; even if one has a mortgage paid off, the asset of the property may eventually contribute to income through sales or rental, but mortgage payments themselves do not provide any direct financial benefit or income during retirement.