Money If you can’t make the April 18 tax deadline, file an extension now. Here’s what to know. April 4, 2023April 18, 2023 Medora Lee, USA TODAY Comments Off on If you can’t make the April 18 tax deadline, file an extension now. Here’s what to know. If you'll miss the April 18 tax deadline, file an extension for six months more. Just remember, you still have to pay by April 18 to avoid penalties.