IRA contribution

My wife and I are retired and I have 2 part time jobs (about $8K in income). I did not withhold any taxes from my 1099 income. We receive monthly social security. 

 

In previous years, I was able to contribute to my wife's IRA and that lowered my tax due. For some reason, when I contribute to her IRA for 2019, my tax due does not decrease. 

 

Any idea why this is not working for me?