First the IRS handles Federal tax returns. It is not the same agency that processes your California state one. And you are not alone in the Federal delay. It's been an unusual year: COVID shutdowns, stimulus payments, major last minute tax law changes. A number of folks who wouldn't normally file Federal tax returns are doing so now to get the stimulus payments. This has increased the IRS' workload. And they didn't officially open until Feb 12 (even if you were accepted earlier) , so we are less than a month into tax season.
