Above the line IRA Contribution

It appears TT is using the sum of both incomes and not allowing me to make an IRA/401k contribution.

Married filing joint & I have a retirement plan @ work; spouse is retired. 

My agi is < 101,000 and I want to contribute in a separate (new) account to reduce the tax bill. 

I've been unable to find a way to do that without running into the your magi is too high - which is it when incomes are combined. 

I appreciate your help.  Thank you.