Does it make sense to fund my IRA if I have to sell investments in my taxable account to fund it?

I currently don't have a job and I'm not sure I will be getting one this year. My only source of income is my investments but does it defeat the purpose of an IRA to sell taxable assets to fund it? Should I just wait until the end of the year to see if I have a job and use that income to invest in the IRA?