10 Common Tax Filing Mistakes You Can Easily Avoid in 2020

Some of the simplest, most easily avoidable mistakes can delay your refund

You’re done. It took you hours, and your dog was looking for a safe place to hide, but you finished your tax return. Off it went to the IRS, then a notice turned up in your mailbox a few weeks later, telling you that you had done something wrong.

Take heart. A mistake won’t result in a full-fledged audit in most cases, although it can hold up your refund until things get straightened out. That notice can signal trouble, however, if you claimed tax deductions or tax credits that you weren't actually eligible to claim.

As unpleasant as preparing your tax return can be, you’re invariably better off taking the time to avoid mistakes. Check your return against this list of common errors before you send it off.

Keep Up With the News

Keeping on top of changes to tax law is particularly important in 2021 as you're preparing your 2020 tax return.

Here's a little test: Which tax return are you going to file? Form 1040, 1040A, or 1040EZ? You won't get very far if you selected Form 1040A or 1040EZ, because they're obsolete. The IRS issued a significantly revised Form 1040 for the 2018 tax year, then it made further adjustments to the 2019 and 2020 returns.

Which form to use won't be a problem if you use tax preparation software—all the software providers are well aware of this wrinkle, and they've adapted their programs accordingly. They're also up to date on the many provisions introduced to the tax code in 2018 subsequent to the passage of the Tax Cuts and Jobs Act (TCJA).

But then came 2020 and the coronavirus pandemic. The American Rescue Plan Act (ARPA) was signed into law in March 2021, providing numerous temporary and advantageous adjustments to the tax code for tax year 2020, the return you'll file in 2021. They include changes to:

  • The Earned Income Tax Credit
  • The Child Tax Credit
  • The Child and Dependent Care Credit
  • The Premium Tax Credit

The law also provides that unemployment compensation isn't taxable at the federal level in 2020 as it normally is, up to $10,200 in benefits for taxpayers with modified adjusted gross incomes of less than $150,000. This doesn't mean that your state won't tax your benefits, however. Check with your state to find out whether they're conforming with federal law in this regard or whether you have to report this income.

The bottom line: Read up on these changes so you know what you can claim in this unique filing season.

Know Your Filing Status

Young woman at home working on a laptop computer
Getty Images/gruizza

You’re faced with choosing your filing status right off the bat when you begin preparing your tax return, and there are some intricate differences among them. The rules for qualifying can make all the difference between being able to file as head of household, a particularly advantageous filing status, or having more of your income taxed as a single taxpayer.

You must have a dependent in order to qualify as head of household, and you must pay for more than 50% of your household’s expenses. You can’t be married—or, at least, you can’t have lived with your spouse at any point during the last six months of the year.

Read up on the ​​rules for dependents and filing statuses before you make a selection. You might be safe if you have a child, but you could run into problems if you try to convince the IRS that your girlfriend is your dependent. 

Get the Data Right

How to File Form 941 for Payroll Taxes
Peopleimages/Getty Images

Math errors are the most frequent problem with tax returns, but sometimes data is erroneously entered even before you begin subtracting, adding, and dividing. 

Use the exact numbers that appear on your W-2, 1099, or other tax forms. Don’t round them up or down. The IRS will compare your tax return to the copies it receives of these forms, and a red flag will begin waving if you claim $41,650 in income rather than $41,652. Take care not to transpose numbers, because problems will also arise if you enter $41,562 instead.

Make sure you get Social Security numbers right as well—yours, your spouse’s if you’re married, and those of your dependents. It will bog down processing of your return if what you enter doesn’t match Social Security Administration records. This includes using the exact name that appears on each individual’s Social Security card as well. And don’t make the mistake of thinking you don’t have to enter a Social Security number for your infant. You can’t claim them as a dependent without one.

So, You're Getting a Refund . . . or Are You?

While we're on the subject of numbers, don't forget to check and double-check and triple-check...your bank account information if you're asking the IRS to direct deposit your refund.

In most cases, you'll enter your bank information at the bottom of Form 1040. However, you must file IRS Form 8888 with your tax return if you want to direct your refund into up to three accounts. It's really a very simple form, but this gives you three opportunities to get the numbers wrong, and a surprising number of people do just that.

You have to enter your banks' routing numbers and your account numbers on the form. Consider reading them aloud to your spouse or a trusted friend after you've entered them on the form, to make sure they're exactly right—they can confirm them against what's printed on your checks or account statements.

What if you make a mistake anyway? You could lose your refund. Yes, you read that right. The best-case scenario is that your bank doesn't have an account with the erroneous number you entered, so it will just send your money back to the IRS. It might mean a big delay, but eventually you'll get your money.

Otherwise, you could find yourself depending on a stranger's honesty if your refund is deposited into someone else's account. They might take the money and run with it rather than notifying the banking institution that there's been a mistake. The IRS will not issue you a new refund when this happens. You can file Form 3911 with the IRS, and they'll contact the bank on your behalf, but they can't compel the bank to cooperate if it refuses.

About That Extra Income You Earned . . .

Man handing woman US dollar banknotes, close-up
PM Images/ Iconica/ Getty Images

Virtually all your income is taxable, every dime. It doesn’t matter if you didn’t receive a W-2 or 1099 form for the money—you still have to report it. This can come as a surprise to some taxpayers who picked up a little eadditional cash over the year in addition to paychecks from their regular jobs. Yes, you're supposed to report it, even if someone just gave you $50 in cash or a $75 bottle of wine for fixing their glitchy computer. 

Most companies will issue you a 1099-NEC form if they pay you $600 or more as an independent contractor or freelancer, but don’t rely on this. Keep good records so you know exactly how much to claim come Tax Day. And again, you still have to report the income even if someone paid you less than $600.

If you receive any type of 1099 form, know that the information it includes must go on your return somewhere. Ask a tax professional if you’re not sure where to enter it.

This issue can be particularly confusing with investment income, and it's a classic mistake with returns. Don’t set the form aside and risk forgetting about it because you’re unsure what to do with it. The IRS receives copies of these forms, too.

To Itemize or Not to Itemize

Tax Time
Getty Images/RonTech2000

Claiming deductions and/or tax credits is an area that just begs taxpayers to make mistakes. Eligibility for certain credits can be quite complicated, and multiple rules apply to many tax deductions as well.

You must itemize to claim some deductions. Itemizing means not claiming the standard deduction for your filing status. This can actually result in paying the IRS more than you have to. Yes, it might be nice to claim a deduction for that donation you made to the American Red Cross, but if your total itemized deductions add up to $5,000, and you’re eligible for a $12,400 standard deduction as a single taxpayer when you file your 2020 return in 2021, you’d end up paying taxes on $7,400 more in income than you had to—the difference between all your itemized deductions and the standard deduction you're entitled to claim instead. 

You’ll need specific proof of the deductions you claim, even if the math works out in your favor, particularly for charitable contributions. Take time to research the rules for this, or ask a tax professional. 

Calculating Eligibility for Tax Credits

Tax day
Julie Thurston Photography / Contributor/Getty Images

As great as tax deductions can be, tax credits can be even better. They come off your taxable income. Tax credits subtract from your tax liability, what you’ve realized you owe the IRS when you get to end of your tax return. 

Let’s say you owe the IRS $5,000, but you qualify for a $1,500 tax credit. Now you only owe the IRS $3,500, because the credit is deducted directly from what you owe. Or maybe you only owe the IRS $1,000, but you’re eligible for a $1,500 tax credit. The IRS will send you a refund for the $500 balance if the credit is refundable (although most aren't), but it will keep the difference if the credit is nonrefundable.

Two notable tax credits are refundable: the Earned Income Credit and the Child Tax Credit. Both of these are more advantageous in the 2020 tax year, thanks to the ARPA, so you might qualify for one or both of them this season, even if you didn't last year. Again, do a little research—don't just assume you can't claim them.

The IRS doesn’t want to send you a tax credit refund without first making very sure that you meet all the rules for qualifying. In fact, one of the provisions included in the Protecting Americans from Tax Hikes (PATH) Act of 2015 requires that the IRS take a little extra time to review all claims for these two refundable credits to make sure the taxpayers really are eligible.

Calculations for qualifying and how much of a credit you can claim can be complex, even without the ARPA changes. It’s easy to make a mistake, and it can be tempting to fudge just a little if you’re on the borderline, because the reward is significant. Don't. Take advantage of the calculators provided by the IRS to make sure you qualify and, if so, for how much. Better yet, touch base with a tax professional, or at least use quality tax preparation software. These programs will determine your eligibility based on your responses to some questions.

Many credits also typically require that you complete extra tax forms and attach them to your tax return in a certain order. If you have any doubt at all that you’re making the calculations correctly or that you’re correctly attaching what must be attached, seek help from a tax professional.

An Easy Fix

Blond woman sitting at desk using digital tablet
Westend61/Getty Images

According to the IRS, you’re more likely to goof on your tax return if you try to do it on paper. Who needs that pressure? Increase your odds of filing a trouble-free return by using tax software or IRS e-file.

These programs walk you through tax preparation by asking you questions and applying your answers to determine what credits and deductions you qualify for. They’ll tell you whether you’re better off itemizing or claiming the standard deduction. Best of all, these programs do the math for you, and some even guarantee that they'll pay any financial penalties on your behalf if they make a mistake. 

Don't Be Late

Maybe you're a procrastinator by nature. Maybe you just hate preparing your taxes so much that you put it off . . . and off . . . and off. Next thing you know, it's almost Tax Day, and you haven't even started your return yet. 

Breathe. You're not in trouble, at least not if you file Form 4868 on time. The form gives you an extra six months to file your return, but there's a catch.

You're supposed to remit any tax you might owe at the time you submit the extension request. Yes, this can be a shot in the dark if you haven't yet completed your tax return, but you'll find estimating calculators all over the internet to help you along. 

The important thing is that you send in some payment. If it turns out that you owe more—or if you make no payment at all—you'll probably be hit with interest and penalties on the outstanding amount after Tax Day (May 17, this year). And if you estimate too much? The IRS will send you a refund. 

Here's another bit of good news for 2021: The IRS has extended the filing (and payment) deadline from April 15 to May 17 in response to the ongoing pandemic.

Did You Sign on the Dotted Line?

This isn't so much a problem with e-filed returns, but it's surprisingly common with old-fashioned, pen-and-paper tax returns. Taxpayers forget to sign on the dotted line. 

Keep in mind that you don't just have to sign your Form 1040. If you ended up having to submit other schedules and forms with your return, many of these must be signed, too. You won't be audited if you forget—at least not if this is the only problem with your return—but the IRS won't process your return, either. You'll get one of those heart-stopping envelopes in the mail with an IRS return address. 

It's a simple fix, but check all your signature lines to spare yourself the aggravation. And make sure you date your return, too. 

Sometimes It Pays to Pay a Professional

Consider enlisting the help of a professional to complete your tax return if your financial situation is particularly complex. Your chances of making a mistake will drop exponentially.