If you can't make the April 18 tax deadline, file an extension now. Here's what to know.

There are only two weeks left before the April 18 tax deadline, and if you haven't filed your taxes yet, you'd better hurry up and do it or file an extension to avoid penalties and interest.

For the week ended March 24, less than half the number of Americans the IRS expects to file individual returns had done so. Only about 80.7 million returns had been received, down 0.8% from the same time a year earlier and well below the more than 168 million individual returns the IRS forecast for this season.

That likely means there'll be many late filers this year – both those who scramble to meet the April 18 midnight deadline or those who should file an extension to Oct. 16.

If you're in the first camp, the good news is the IRS is processing returns and churning out refunds faster than in 2022. It has so far processed 1.9% more returns compared with the same time last year and issued 2.6% more refunds. The bad news is the average refund is down 11% to $2,903.

But if you need to file an extension, here's what you need to know.

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What is a tax extension?

It's important to know filing an extension entitles you to an additional six months to file your tax return, but it is not an extension to pay what you owe. You should estimate and pay any owed taxes by your regular deadline to help avoid possible penalties.

Deadline for filing income tax returns that have received an extension

An extension request must be filed by the normal April 18 tax deadline. Since it's automatic as soon as you file it, your new deadline will be Oct. 16. If you owe taxes and don't file for an extension, the IRS will charge you a steep penalty for failing to file.

If you're due a refund or not required to file, you won't be charged a penalty, according to the IRS. However, experts say that could be a risky strategy. If you miscalculated and end up owing money, you could end up paying a big penalty.

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How to request an extension for a tax return

Filing for an extension is simple and free. You'll need basic information like name, address, Social Security number, estimated tax liability, and payment if you owe anything. Only those who owe less than $1,000 or paid at least 90% of the tax shown on the return for the taxable year or 100% of the tax shown on the return for the prior year, whichever amount is less, can avoid an underpayment penalty, the IRS says.