Personal interest income. State and local income tax payments. Any penalties, fines, or interest payments made on income tax statements. Personal transfer payments to foreigners. Personal savings is what is left over from personal income after deducting the above outlays, contributions to social insurance, and taxes.
Personal savings divided by disposable personal income is the personal savings rate.
Disposable personal income equals personal income after deducting personal taxes and individual contributions to social insurance, but before personal outlays are deducted. If individuals choose to spend more as a result of this increased wealth, such behavior would drive down traditional measures of personal savings. This is so because under NIPA, the increase in wealth does not show up as income, but the increased consumption that some of it finances does figure into the savings rate calculation. One could argue that a more complete measure of saving would include increased wealth through capital gains as part of personal income. FFA consistently shows a higher national savings rate than NIPA, but receives less attention in the news media.