If you miss the tax deadline, you may face penalties and interest from the IRS. However, the specific penalties depend on whether you owe taxes or are due a refund. Here are some key points to keep in mind:

• If you didnt file and owe tax, file a return as soon as possible and pay as much as possible to reduce penalties and interest.
• If you missed the tax deadline but are due a refund, there is no penalty for filing a late return.
• If you missed the tax deadline and owe taxes, you may face two types of penalties from the IRS: the failure-to-file penalty and the failure-to-pay penalty.
• The failure-to-file penalty is 5% of your unpaid taxes for each portion of a month your tax return remains outstanding, up to a maximum of 25% of your unpaid taxes.
• The failure-to-pay penalty is 0.5% of the tax you did not pay timely for each portion of a month your tax remains outstanding, up to a maximum of 25% of your unpaid taxes.
• If you miss the tax deadline and have a good explanation, you might be able to avoid the penalties (but not interest) .
• If you need more time to pay your taxes, you can apply for an installment agreement with the IRS.

In summary, if you miss the tax deadline, its important to file your return as soon as possible and pay as much as you can to reduce penalties and interest. If you owe taxes, you may face penalties for failure to file and failure to pay. However, if you are due a refund, there is no penalty for filing a late return. If you have a good explanation for missing the deadline, you may be able to avoid the penalties.