Prepare - The online system gives you 30 minutes to complete your report. If you go beyond this you may get "timed out.You can file your Portland taxes quickly and easily with TaxAct, which stands out as the only e-filing consumer tax filing software that can handle these specific Portland municipal tax forms. File electronically using Revenue Online. or. ​​Mail paper form to us: Oregon Department of Revenue Attn: Deferral Unit PO Box 143780. Out of Business Notification: PDF. Extension Request: Online PDF. Revenue Online is a secure web service that provides access to your tax account at any time. Oregon no longer has free fillable forms ​that can be filed online. Oregon forms are PDFs you can fill out before printing if you are not e-filing. MyFreeTaxes.