2B,
Look at Table 2 in the link. (Here it is again .
http://www.bea.gov/bea/newsrel/pinewsrelease.htm )
The details are there and fairly starightforward.
1) First, the government computes personal income (which includes
- Compensation from:
Wage and salary disbursements.
Supplements to wages and salaries
Employer contributions for employee pension and insurance funds
Employer contributions for government social insurance
- Proprietors' income with inventory valuation and capital consumption adjustments
- Rental income of persons with capital consumption adjustment
- Personal income receipts on assets
- Personal interest income
- Personal dividend income
- Personal current transfer receipts
- Government social benefits to persons
- Other current transfer receipts, from business (net)
2) From this personal income, two things are subrtacted:
- Contributions for government social insurance (i.e Social Security)
- Personal current taxes
3) The result is disposable personal income
4) To obtain the savings rate, the government subtracts personal outlays from personal disposable income. Personal outlays include:
- Personal consumption expenditures (durable goods, non-durable goods, services, personal interest payments, personal current transfer payments)
As you can see, the "savings rate" isn't computed by directly measuring savings (whether tax-deferred or not). It is measured indirectly, and is merely the difference between what people earned and what they spent. It's not a perfect measure, but it does an okay job of describing how much of their income (including interest and dividends, as well as employer matches to 401Ks and SS) people are stashing away. That's a different question than how much individual net worths are increasing/decreasing, etc.