@olenilsen TT uses the same infrastructure (think servers, middleware, API that you use for the online version of the software) for all tax years, but only one year can be used at a time.
So regardless of the extension provided by the IRS for CA residents, TT has to begin re-tooling the website for the 2023 tax season. It needs from now until it launches in late November (figure 6 weeks) to do all the updates, testing, etc.
TT made a business decision that the deadline is the deadline because of their business needs. Customers can use the desktop version (which I think is cheaper than the online version) to complete their 2022 tax return. And then mail the tax return.
Also, while there is an extended deadline for CA, the deadline for claiming a refund is not until 2026! There is no penalty, no interest and no 2023 deadline if that is the case!!! So it's more customers impacted by TT's business decision than just CA customers.
This is just the way TT has chosen to run their business. You might try a competitor and see if they accomodate efiling until a later date. Professional tax preparers can certainly efile for 2022 (and 2021 and 2020) if you want to go that route.
