It depends on your age and taxable income. Here is what is stated on the IRS website IRA
and Roth Contribution Limits:
For 2015, 2016, 2017 and 2018, your total contributions to all of your traditional and Roth IRAs cannot be more than:
-
$5,500 ($6,500 if you’re age 50 or older), or
- your taxable compensation for the year, if your compensation was less than this dollar limit.
In your case, if at least one of you is over 50, you are able to make a total of $11,500 of Roth contributions, because you have $11,500 of taxable compensation. Even though only one spouse has income, there is a provision that allows each of you to contribute up to the max amount that income will allow. (In your case, this is up to the $11,500 of taxable income you are reporting). Do not reduce the contribution by the amount of Social Security and Medicare withheld from your wages.
[Edited 03/17/2019:12:53 PST]
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