On Form 3115, Tax year of change begins is the first date when you made the change in accounting method. If you have no plans to stop using this method, leave the tax year of change ending date blank.
Because Form 3115 is not supported by TurboTax Online in the interview, you may wish to switch TurboTax Desktop (available in Forms Mode). Consult the instructions for this form: Instructions for Form 3115
IRS Instructions for Form 3115: Year of Change
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