You realize that personal income doesn't include benefits? Or capital gains? Or probably a dozen other things that I can't find at the moment?
Here is a post that while not directly answering your question, talks about several related issues.
If that doesn't give you enough info to answer your question and you really want more, let me know and I'll try to scrape more info together for you.
Another quandry. You say it doesn't. BLS says otherwise.
From http://bea.gov/bea/glossary/glossary_p.htm
Personal income. Income received by persons from all sources. It includes income received from participation in production as well as from government and business transfer payments. It is the sum of compensation of employees (received), supplements to wages and salaries, proprietors' income with inventory valuation adjustment (IVA) and capital consumption adjustment (CCAdj), rental income of persons with CCAdj, personal income receipts on assets, and personal current transfer receipts, less contributions for government social insurance. Related terms: state personal income, local area personal income.
Supplements to wages and salaries. Consists of employer contributions for employee pension and insurance funds and employer contributions for government social insurance.
Employer contributions for government social insurance. Contributions consisting of employer payments under the following Federal Government and State and Local government programs: Old-age, survivors, and disability insurance (social security); hospital insurance; unemployment insurance; railroad retirement; pension benefit guaranty; veterans life insurance; publicly administered workers' compensation; military medical insurance and temporary disability insurance.
So it would seem that personal income DOES include everything that individuals gain from the economy. Please tell me again why GDP has been soaring while personal income has been skimming the treetops.