The IRS announced the latest “Dirty Dozen” scams. The agency also warns that taxpayers who wittingly or unwittingly get involved with these scams must repay all taxes due plus interest and penalties. Here they are:

Phishing: Taxpayers need to be on guard against fake emails or websites looking to steal personal information. The IRS will never initiate contact with taxpayers via email about a bill or refund. Don’t click on one claiming to be from the IRS. Be wary of emails and websites that may be nothing more than scams to steal personal information. (IR-2017-15)

For a look at one of the latest phishing scams targeting CPAs and tax preparers, watch our video.

Phone Scams: Phone calls from criminals impersonating IRS agents remain an ongoing threat to taxpayers. The IRS has seen a surge of these phone scams in recent years as con artists threaten taxpayers with police arrest, deportation and license revocation, among other things. (IR-2017-19)

Identity Theft: Taxpayers need to watch out for identity theft especially around tax time. The IRS continues to aggressively pursue the criminals that file fraudulent returns using someone else’s Social Security number. Though the agency is making progress on this front, taxpayers still need to be extremely cautious and do everything they can to avoid being victimized. (IR-2017-22)

Return Preparer Fraud: Be on the lookout for unscrupulous return preparers. The vast majority of tax professionals provide honest high-quality service. There are some dishonest preparers who set up shop each filing season to perpetrate refund fraud, identity theft and other scams that hurt taxpayers. (IR-2017-23)

Fake Charities: Be on guard against groups masquerading as charitable organizations to attract donations from unsuspecting contributors. Be wary of charities with names similar to familiar or nationally known organizations. Contributors should take a few extra minutes to ensure their hard-earned money goes to legitimate and currently eligible charities. IRS.gov has the tools taxpayers need to check out the status of charitable organizations. (IR-2017-25)

Inflated Refund Claims: Taxpayers should be on the lookout for anyone promising inflated refunds. Be wary of anyone who asks taxpayers to sign a blank return, promises a big refund before looking at their records, or charges fees based on a percentage of the refund. Fraudsters use flyers, advertisements, phony storefronts and word of mouth via community groups where trust is high to find victims. (IR-2017-26)

Excessive Claims for Business Credits: Avoid improperly claiming the fuel tax credit, a tax benefit generally not available to most taxpayers. The credit is usually limited to off-highway business use, including use in farming. Taxpayers should also avoid misuse of the research credit. Improper claims often involve failures to participate in or substantiate qualified research activities and/or satisfy the requirements related to qualified research expenses. (IR-2017-27)

Falsely Padding Deductions on Returns: Taxpayers should avoid the temptation to falsely inflate deductions or expenses on their returns to pay less than what they owe or potentially receive larger refunds. Think twice before overstating deductions such as charitable contributions and business expenses or improperly claiming credits such as the Earned Income Tax Credit or Child Tax Credit. (IR-2017-28)

Falsifying Income to Claim Credits: Don’t invent income to erroneously qualify for tax credits, such as the Earned Income Tax Credit. Taxpayers are sometimes talked into doing this by con artists. Taxpayers should file the most accurate return possible because they are legally responsible for what is on their return. This scam can lead to taxpayers facing large bills to pay back taxes, interest and penalties. In some cases, they may even face criminal prosecution. (IR-2017-29)

Abusive Tax Shelters: Don’t use abusive tax structures to avoid paying taxes. The IRS is committed to stopping complex tax avoidance schemes and the people who create and sell them. The vast majority of taxpayers pay their fair share, and everyone should be on the lookout for people peddling tax shelters that sound too good to be true. When in doubt, taxpayers should seek an independent opinion regarding complex products they are offered. (IR-2017-31)

Frivolous Tax Arguments: Don’t use frivolous tax arguments to avoid paying tax. Promoters of frivolous schemes encourage taxpayers to make unreasonable and outlandish claims even though they have been repeatedly thrown out of court. While taxpayers have the right to contest their tax liabilities in court, no one has the right to disobey the law or disregard their responsibility to pay taxes. The penalty for filing a frivolous tax return is $5,000. (IR-2017-33)

Offshore Tax Avoidance: The recent string of successful enforcement actions against offshore tax cheats and the financial organizations that help them shows that it’s a bad bet to hide money and income offshore. Taxpayers are best served by coming in voluntarily and getting caught up on their tax-filing responsibilities. The IRS offers the Offshore Voluntary Disclosure Program  to enable people to catch up on their filing and tax obligations. (IR-2017-35)

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Nick Spoltore is Senior Director of Tax & Advisory Content for Surgent Professional Education. Mr. Spoltore is a graduate of the University of Notre Dame and of Delaware Law School. Before joining Surgent, he practiced tax and business law at the firm of Heaney, Kilcoyne in Pennsylvania and also in Delaware.