Today is the last day for most taxpayers to file a 2023 return, otherwise known as Tax Day.

The IRS had received 101.8 million returns by April 5 and processed just over 100 million. The average refund to date is $3,011, compared with $2,878 last year at the same time.

If you don't think you will be able to file your taxes today, it is also the last day to file a tax extension, otherwise known as Form 4868.

With Tax Day comes a lot of questions about what forms taxpayers need to file taxes. Here is some helpful information about W-4 forms, tax extensions and more.

Tax Day 2024 live updates:What to know about extensions, free file, deadlines and refunds

What is a W-4 form?

According to the Internal Revenue Service, you should complete a Form W-4 so that your employer can withhold the correct federal income tax from your pay.

Accurately filling out this form can help you avoid a tax payment when you file your return.

The IRS says you should "consider completing a new Form W-4 each year and when your personal or financial situation changes."

The IRS' latest version of the W-4 form is available on its website.

When is the last day to file taxes in 2024?

The last day to file a tax return with the IRS is Monday, April 15 for the vast majority of Americans.

How to file a tax extension with form 4868

Tax filers can use IRS Free File to request an extension electronically.

But if you prefer to mail a paper version of the extension, called form 4868, make sure it's postmarked no later than April 15 - today is the deadline for filing an extension.

If you get an extension, you'll have until Tuesday, Oct. 15, 2024 to file your return.

You can request a free extension through the IRS. You'll need basic information, like your name, address, Social Security number, and estimated tax liability. Be prepared to make a payment, if you owe anything and have the funds.

File a tax extension:You may need Form 4868 to file a tax extension. Here's what to know as deadline looms.

How to file taxes for free

More people are filing their taxes using Free File this year, the IRS said.

Free File allows any taxpayer with an adjusted gross income of $79,000 or less in 2023 to file taxes for free through one of eight IRS partners. To access the service, go online at IRS Free File and use the guided software.

If you're eligible, a free filing can save you a pretty penny. An individual taxpayer is estimated to spend 13 hours and $240 in out-of-pocket costs to prepare and file an annual tax return, according to the Taxpayer Advocate. 

Contributing: Daniel de Visé, Medora Lee, James Powel & Emily DeLetter, USA TODAY

Gabe Hauari is a national trending news reporter at USA TODAY. You can follow him on X @GabeHauari or email him at [email protected].