2024 Preliminary Taxes

When will I be able to use TurboTax online for preliminary 2024 Taxes? I need to decide about doing a roll-over to my Roth IRA and how much I can roll-over without negatively impacting IRMAA. Need to do this before year-end and in time to actually allow for the monies to be transferred - at least 2 to 3 weeks before the end of the year.