Why does Oregon want to know if this is my first time filing an Oregon income tax return with my social security number?

If this is your first time filing an Oregon tax return with your social security number because you've previously filed an Oregon income tax return with an ITIN, answer Yes to this question. Oregon wants to easily find your old return and ITIN and match them with this year's return filed with your new social security number.

If this is your first time filing an Oregon income tax return with your social security number because this is your first time filing an Oregon return, answer No to this question.