Here is a nice article provided by Joy Taylor of Kiplinger:
In 2015, the Internal Revenue Service audited only 0.84% of all individual tax returns. So the odds are generally pretty low that your return will be picked for review.
That said, your chances of being audited or otherwise hearing from the IRS escalate depending on various factors. Math errors may draw an IRS inquiry, but they’ll rarely lead to a full-blown exam. Whether you're filing your 2015 return in October after getting an extension or looking ahead to filing your 2016 return early next year, check out these red flags that could increase the chances that the IRS will give the return of a retired taxpayer special, and probably unwelcome, attention.
1. Making a Lot of Money
Although the overall individual audit rate is only about one in 119, the odds increase dramatically as your income goes up, as it might if you sell a valuable piece of property or get a big payout from a retirement plan.
IRS statistics show that people with incomes of $200,000 or higher had an audit rate of 2.61%, or one out of every 38 returns. Report $1 million or more of income? There's a one-in-13 chance your return will be audited. The audit rate drops significantly for filers reporting less than $200,000: Only 0.76% (one out of 132) of such returns were audited, and the vast majority of these exams were conducted by mail.
We're not saying you should try to make less money—everyone wants to be a millionaire. Just understand that the more income shown on your return, the more likely it is that you'll be hearing from the IRS.
2. Failing to Report All Taxable Income
The IRS gets copies of all 1099s and W-2s you receive. This includes the 1099-R (reporting payouts from retirement plans, such as pensions, 401(k)s and IRAs) and 1099-SSA (reporting Social Security benefits).
Make sure you report all required income on your return. IRS computers are pretty good at matching the numbers on the forms with the income shown on your return. A mismatch sends up a red flag and causes the IRS computers to spit out a bill. If you receive a tax form showing income that isn't yours or listing incorrect income, get the issuer to file a correct form with the IRS.
3. Taking Higher-Than-Average Deductions
If deductions on your return are disproportionately large compared with your income, the IRS may pull your return for review. A large medical expense could send up a red flag, for example. But if you have the proper documentation for your deduction, don't be afraid to claim it. There's no reason to ever pay the IRS more tax than you actually owe.
4. Claiming Large Charitable Deductions
We all know that charitable contributions are a great write-off and help you feel all warm and fuzzy inside. However, if your charitable deductions are disproportionately large compared with your income, it raises a red flag.
That's because the IRS knows what the average charitable donation is for folks at your income level. Also, if you don't get an appraisal for donations of valuable property, or if you fail to file Form 8283 for non-cash donations over $500, you become an even bigger audit target. And if you've donated a conservation or facade easement to a charity, chances are good that you'll hear from the IRS.
Be sure to keep all your supporting documents, including receipts for cash and property contributions made during the year.
5. Not Taking Required Minimum Distributions
The IRS wants to be sure that owners of IRAs and participants in 401(k)s and other workplace retirement plans are properly taking and reporting required minimum distributions. The agency knows that some folks age 70½ and older aren’t taking their annual RMDs, and it’s looking at this closely.
Those who fail to take the proper amount can be hit with a penalty equal to 50% of the shortfall. Also on the IRS’s radar are early retirees or others who take payouts before reaching age 59½ and who don’t qualify for an exception to the 10% penalty on these early distributions.
Individuals age 70½ and older must take RMDs from their retirement accounts by the end of each year. However, there’s a grace period for the year in which you turn 70½: You can delay the payout until April 1 of the following year. A special rule applies to those still employed at age 70½ or older: You can delay taking RMDs from your current employer’s 401(k) until after you retire (this rule doesn’t apply to IRAs). The amount you have to take each year is based on the balance in each of your accounts as of December 31 of a prior year and a life-expectancy factor found in IRS Publication 590-B.
6. Claiming Rental Losses
Claiming a large rental loss can command the IRS’s attention. Normally, the passive loss rules prevent the deduction of rental real estate losses. But there are two important exceptions. If you actively participate in the renting of your property, you can deduct up to $25,000 of loss against your other income. This $25,000 allowance phases out at higher income levels. A second exception applies to real estate professionals who spend more than 50% of their working hours and more than 750 hours each year materially participating in real estate as developers, brokers, landlords or the like. They can write off losses without limitation.
The IRS is actively scrutinizing rental real estate losses. If you’re managing properties in your retirement, you may qualify under the second exception. Or, if you sell a rental property that produced suspended passive losses, the sale opens the door for you to deduct the losses. Just be ready to explain things if a big rental loss prompts questions from the IRS.
7. Failing to Report Gambling Winnings or Claiming Big Losses
Whether you’re playing the slots or betting on the horses, one sure thing you can count on is that Uncle Sam wants his cut. Recreational gamblers must report winnings as other income on the front page of the 1040 form. Professional gamblers show their winnings on Schedule C. Failure to report gambling winnings can draw IRS attention, especially because the casino or other venue likely reported the amounts on Form W-2G.
Claiming large gambling losses can also be risky. You can deduct these only to the extent that you report gambling winnings. And the costs of lodging, meals and other gambling-related expenses can only be written off by professional gamblers. Writing off gambling losses but not reporting gambling income is sure to invite scrutiny. Also, taxpayers who report large losses from their gambling-related activity on Schedule C get an extra look from IRS examiners, who want to make sure that these folks really are gaming for a living.
8. Writing Off a Loss for a Hobby
Your chances of "winning" the audit lottery increase if you file a Schedule C with large losses from an activity that might be a hobby—dog breeding, jewelry making, coin and stamp collecting, and the like. Agents are specially trained to sniff out those who improperly deduct hobby losses. So be careful if your retirement pursuits include trying to convert a hobby into a moneymaking venture.
You must report any income from a hobby, and you can deduct expenses up to the level of that income. But the law bans writing off losses from a hobby.
To be eligible to deduct a loss, you must be running the activity in a business-like manner and have a reasonable expectation of making a profit. If your activity generates profit three out of every five years (or two out of seven years for horse breeding), the law presumes that you're in business to make a profit, unless the IRS establishes otherwise. If you're audited, the IRS is going to make you prove you have a legitimate business and not a hobby. Be sure to keep supporting documents for all expenses.
9. Neglecting to Report a Foreign Bank Account
Just because you may be traveling more in retirement, be careful about sending your money abroad. The IRS is intensely interested in people with money stashed outside the U.S., and U.S. authorities have had lots of success getting foreign banks to disclose account information. The IRS also uses voluntary compliance programs to encourage folks with undisclosed foreign accounts to come clean—in exchange for reduced penalties. The IRS has learned a lot from these amnesty programs and has been collecting a boatload of money (we’re talking billions of dollars). It’s scrutinizing information from amnesty seekers and is targeting the banks that they used to get names of even more U.S. owners of foreign accounts.
Failure to report a foreign bank account can lead to severe penalties. Make sure that if you have any such accounts, you properly report them.
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