If you receive a penalty for late filing, you can request relief via the First Time Abate process with the IRS. Failure to File (which is the likely penalty that may be applied in this case) is covered by the First Time Abate process.
Generally, qualifications for the First Time Abate include a history of good tax compliance (defined as the immediately prior three years of tax returns filed and no other penalties in that three year period). The link above has additional guidance and how to request the First Time Abate from the IRS. This TurboTax article has additional useful information as well: IRS Tax Penalty Abatement and Relief
For future reference, TurboTax offers an Easy Tax Extension web based tool that is free to use: TurboTax Easy Tax Extension. Filing deadlines are generally midnight your local time zone.
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