If I only earned $5,000 in wages in a year, can I put it all into a Roth IRA account ?

[macuser_22]

Sure, if it was wages from working and not excluded foreign income and you meet the other Roth IRA contribution requirements.

The most you can contribute to all of your traditional and Roth IRAs is the smaller of:

For 2018, $5,500, or $6,500 if you’re age 50 or older by the end of the year; or
your taxable compensation for the year.
For 2019, $6,000, or $7,000 if you’re age 50 or older by the end of the year; or
your taxable compensation for the year.

(Taxable compensation is generally wages that you worked for - W-2 or net self-employed income minus the deducible part of the SE tax, but can include commissions, alimony and separate maintenance, and nontaxable combat pay ).

See this IRS article for Roth contribution limits:

https://www.irs.gov/retirement-plans/roth-iras