Are there any major changes to federal or Oregon returns from 2019 to 2020? There aren't drastic changes in my income, my tax paid, or my itemized deductions, yet receiving about 1k less for both federal and state returns. I think more concerning is the state return, when I play with the numbers to enter things that were similar in 2019 OR return doesn't seem to budge.
For Oregon........you can have an OR income deduction for your Federal tax liability. (only a few states allow this)
Oregon adjusts the initially calculated Federal tax liability by the amount of Federal stimulus (and a few other things).....so, you may be getting a lower deduction from OR income for that reason alone. ( that worksheet is on page 65&66 of the 2020 OR tax instructions ).
2020 Publication OR-17, Oregon Individual Income Tax Guide, 150-101-431
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For the Federal tax return, you'd need to print out the 2020 Fed forms and compare them carefully to a print-out of your 2019 forms...and compare them side-by side to see if there is a section with an unexplained change from 2019...then go look at suspect sections to see if you've entered everything properly.
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Sometimes state values don't change immediately with a change in the Federal section....until you step thru the state section too.