Because of the disruption caused by COVID-19, the IRS has extended the deadline for filing individual tax returns from April 15 to July 15. U.S. states have followed suit, with the majority moving their deadline to July 15 as well, and a few setting other dates later in the spring and summer. For many Americans stuck at home and struggling to keep their life in order, the deadline extension came as welcome news.

IRS audits are down compared to previous years. In fiscal 2019, the IRS audited less than 0.5% of individual tax returns. While that figure is much lower than in years past — it is about half of the rate in 2010 — there are some common mistakes that are more likely to prompt an audit or delay a return.

The IRS lists several common errors filers make each year on its website. The errors vary in complexity from failing to correctly calculate a deduction to simply failing to sign and date the return or using the wrong postage. While some of these mistakes seem obvious and easily avoidable, they are common enough that the IRS lists them as issues.

A great many of these errors can be avoided simply by filing electronically, as the vast majority of Americans now do. Even when e-filing, however, many of the mistakes the IRS lists remain common. Many of these can be lumped into the category of simply failing to fill in the right boxes or the correct figures or forgetting to include the various deductions, credits, and allowances. Avoiding these mistakes can help ensure getting your refund without much hassle. These are the states with the largest average tax refund.

These are 19 of the most common mistakes Americans make while filing their tax returns.

Click here to see the 19 most common tax mistakes

19. Failure to make a copy of signed return

It is important to make a copy of signed tax returns as many common types of loans, including mortgages and student loans, require past tax information. If filers are missing copies of previous returns but need one, the IRS can send a copy for $50 each. Keeping copies of your returns on record can also be very handy in the event of an audit or if you need to amend a return.

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18. Failure to double-check routing and account numbers

While this may seem obvious, it is one of the more common mistakes Americans make when filing their taxes. Banking and routing numbers with errors can make it difficult for the IRS to issue a refund via direct deposit and can delay your refund by months.

17. Failure to include all necessary information on checks or money orders

If filers owe the IRS money and they aren’t filing electronically, they must include a payment — check or money order payable to the “United States Treasury” — that includes name, address, social security number, daytime telephone number, tax form, and the tax year on the payment.

16. Sending in return with inadequate postage

If you are not one of the majority of Americans who file their taxes electronically, make sure you have the correct postage on the envelope when you send in your taxes. Otherwise, the postal service will return it to you, putting you at risk of missing the new July 15 filing deadline.

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15. Sending your return to the wrong IRS office

There are different IRS office addresses for specific regions and types of tax documents. If you send your return to the wrong IRS office, potentially delaying your refund, you are not alone. Using the wrong IRS address is one of the most common mistakes Americans make each year.

14. Arranging tax documents in the incorrect order

Errors on your tax return, including something as simple as failure to organize documents in sequential order, can result in a delayed refund. Make sure to use the sequence numbers on the documents to maintain the correct order.

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13. Failing to attach 1099-R forms

1099-R forms are used to claim retirement plans, pensions, and annuities withheld over the course of the year, or used to report funds that were withdrawn from an IRA. Some of these funds can be treated as income, bumping filers into a higher bracket. Failing to report these payments and withdrawals can result in an audit.

12. Failure to include all W-2 forms

The IRS requires taxpayers to include an official copy of their W-2 forms from their employer or employers, if they have more than one job. Wages and withholdings noted on these forms must be combined and reported on the tax return.

11. Failure to use Identity Protection PIN (if applicable)

An IP PIN is a six-digit number assigned to eligible taxpayers to help protect against fraudulent use of their social security number. While not everyone is eligible for a pin, those who are must follow separate tax filing instructions specific to IP PIN holders. Visit this page on the IRS website for details on who is eligible, which localities are using them, and how to get yours if you believe you should have one.

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10. Failing to sign and date return

One of the simplest and most important steps while filing is signing and dating the return — and have your spouse sign and date if you are filing jointly. Unsigned and undated returns cannot be accepted and will be sent back for signing.

9. Using incorrect column from the tax tables form

If you are calculating your own taxes, you will likely need to refer to the 1040 Tax Tables document to make the calculations. If you are not looking in the column applicable to you, however, you could easily miscalculate. While this may sound obvious, the IRS reports it as one of the most common mistakes.

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8. Failing to claim the correct deduction if over 65 or blind

Those who are blind or over 65 are entitled to specific deductions, but filers must use a chart found on the 1040 or 1040A forms to determine the correct deduction. According to the IRS, people claiming these deductions frequently misuse the tables and list the wrong amount.

7. Failure to enclose negative amounts in brackets

This common mistake can have potentially serious consequences. If negative figures are not noted in brackets, they may be misinterpreted by the IRS as positive numbers and result in additional taxes.

6. Incorrectly calculating deductions and credits

Tax deductions, such as charitable donations, effectively reduce taxable income, while tax credits directly reduce taxes owed. Miscalculations could result in overpaying the IRS.

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5. Entering income on the wrong lines

One simple and easily avoidable mistake that will certainly raise eyebrows at the IRS is income entered in the wrong box.

4. Failure to correctly list all dependents

Taxpayers must list all names and taxpayer identification numbers for each person listed on the return. If the tax filer is using social security numbers, the corresponding names must appear exactly as they do on the corresponding social security card.

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3. Failure to correctly declare exemptions

In order to benefit from spousal and dependency exemptions, the IRS requires certain information. For spousal exemptions, both you and your spouse’s age as well as the gross income amounts must appear. For dependents, taxpayers must disclose their relationship to the dependent and the amount of support provided.

2. Choosing the incorrect filing status

Filing status is used to determine certain filing requirements, deductions, and credit eligibility. Despite being essential to correctly filing taxes, choosing the incorrect filing status remains a relatively common mistake among American taxpayers. The five filing statuses are: single, married filing jointly, married filing separately, head of household, and qualifying widow(er) with dependent child or children.

1. Tax return is illegible

It should come as no surprise that if the IRS cannot read your name, taxpayer ID number, or address, agents cannot process your return. Still, illegible penmanship is a common problem among those who do not file electronically.

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