Anything that is NOT protected by the TX exemptions. Don't mean that to sound trite, but that's the gist of it. Exempt funds would be things like SSI or SSDI or income from a qualified retirement plan or pension. Public assistance and unemployment are exempt.
"Church benefit plan benefits
Fraternal benefit society benefits
Life, health, accident or annuity benefits or monies, including policy proceeds and cash values to be paid or rendered to beneficiary or insured
Life insurance present value if beneficiary is debtor or debtor’s dependent (see note under personal property)
Retired public school employees group insurance
Texas employee uniform group insurance
Texas state college or university employee benefits"
Pensions:
"County & district employees
ERISA-qualified government or church benefits, including Keoghs and IRAs
Firefighters
IRAs to extent tax-deferred
Judges
Keoghs to extent tax-deferred
Law enforcement officers’ survivors
Municipal employees
Police officers
Retirement benefits to extent tax-deferred
State employees
Teachers"
Public Assistance:
"Crime victims’ compensation
Medical assistance
Public assistance
Unemployment compensation
Workers’ compensation"
Anything else is fair game.