1. Short title; table of contents (a) Short title This Act may be cited as the Social Security Expansion Act . (b) Table of contents The table of contents of this Act is as follows: Sec. 1. Short title; table of contents. Sec. 2. Across-the-board benefit increase. Sec. 3. Computation of cost-of-living increases. Sec. 4. Increase in minimum benefit for lifetime low earners based on years in the workforce. Sec. 5. Extended benefit eligibility for children who are full-time students. Sec. 6. Payroll tax on remuneration up to contribution and benefit base and more than $250,000. Sec. 7. Tax on net earnings from self-employment up to contribution and benefit base and more than $250,000. Sec. 8. Tax on investment gain. Sec. 9. Social Security Trust Fund established. 2. Across-the-board benefit increase (a) Increase of first bend point percentage Section 215(a)(1)(A)(i) of the Social Security Act ( 42 U.S.C. 415(a)(1)(A)(i) ) is amended by striking 90 percent and inserting 95 percent . (b) Adjustment To bend point amount (1) In general Section 215(a)(1)(B) of the Social Security Act ( 42 U.S.C. 415(a)(1)(B) ) is amended— (A) by redesignating clause (iii) as clause (iv)