What do you mean a smaller deduction? The taxable SS is different for line 5b? Then another income line has to be different too. You have to compare each lines. It's easy to enter something different or answer a question differently between online and Desktop.
heres an idea......you can try downloading your online return tax file without paying for it. But first save your Desktop return with a different name. Then you can find what's different.
First download the .tax file from the Online version,
https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-tax-data-...
Then see, How to Switch to Desktop,
https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-th...
After you get the program installed the first thing to do before you open your tax return is to update the program and install any state programs you had. So you first might need to start a fake return to be able to download the state program (go to FILE - New)
Then you just OPEN the .tax2019 file, go up to File-Open. You don't import or transfer it.
