TurboTax will generate the original Form 3840 based on the Form 8824 for the year of the exchange transaction. It doesn't have the ability to access that original form year after year. California expects taxpayers to submit Form 3840 with each succeeding year's return until the deferred gain is recognized.
All taxpayers, regardless of residence status or commercial domicile, who exchange real property located in California for like-kind property located outside of California, must file form FTB 3840 with their California tax return. See here for California information on like-kind exchanges.
Form FTB 3840 must be filed for the taxable year of the exchange and for each subsequent taxable year, generally until the California source deferred gain or loss is recognized on a California tax return.
To get to CA Form 3840 and include it with your 2023 return, go to the California state return interview. When you get to the screen, "Here's the income that California handles differently", scroll down to the section labeled Investments and select "Like-Kind Exchanges for Property Located Outside California", then Yes to complete the form.
For Question B, select the radio button for Annual FTB 3840 since this is not the year of the exchange.
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