It is difficult to predict because it will depend on many things, including how much tax you must pay to California. See Oregon Estimated Income Tax Instructions 2020 for instructions on how to estimate your payments.
You will have to pay the interest on the amount of payments if it is less than:
— Ninety percent of your current year tax after all credits; or
— One hundred percent of the tax after all credits shown on your prior return; or
— Ninety percent of the tax on your annualized income.
(If you make sure your withholdings and estimated tax payments equal the prior year tax paid, you will avoid the interest for underpayment of estimated tax.)
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