Last week, the IRS posted guidance on what else is extended to May 17, besides individual 1040s, which are normally due April 15. Contributions to IRAs, HSAs, MSAs, and Coverdell ESAs for the 2020 tax year have all been extended to May 17. Anyone who has not filed a 2017 tax return and who is owed a refund on that return has until May 17, or the refund will be gone forever. This extension is automatic for all taxpayers. However, the due date for first quarter estimated tax payments for 2021 has not been extended and is still April 15. This list from the AICPA explains which states have extended their income tax return due dates so far.

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