Saving Rate is the percentage of income a person sets aside every year. The money does not need to be held in cash and can be used to buy income producing assets.
For example, if you earn $100,000 a year and pay $25,000 in taxes.
Your Net Income = $100,000-$25,000 = $75,000
If your annual expenses are $50,000 then
Your Saving Rate = $25,000/$75,000 = 33.33%