GMAT Critical Reasoning (CR) | Re: CR Revision: The United States government uses only a household’s cash

This is my interpretation:

P1: The United States government uses only a household’s cash income before taxes to determine whether that household falls below the poverty line in a given year; capital gains, non-cash government benefits, and tax credits are not included. However, yearly cash income is not a fool-proof measure of a given household’s disposable income.

Cash ---> Government policy (premise)

Conclusion:Others ---> Cash ---> Government Policy change (Need from Question