During your session, you tell the guy you donated some stuff to charity. You’re not sure how much the items were worth. The guy puts down a value that is definitely inflated. Other deductions are also overstated. You express concern.

“Everybody does it,” the tax guy assures you.

At the end of the appointment, you’re thrilled with the size of the refund he says you’ll get. Then the preparer says that, because he’s getting you back so much money, your fee will be a percentage of the refund. You think that’s only fair. You sign the return.

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Your tax preparer is a crook.

This scenario is merely hypothetical. But the IRS routinely releases examples of cases of real-life investigations that have led to criminal prosecution and sentences for tax-prep fraud and abuse. The National Consumers League has offered the following red flags that can signal your tax preparer is dishonest:

● The person doesn’t have a Preparer Tax Identification Number, or PTIN. All paid preparers are required to register with the IRS and get a PTIN, which should be included on your tax return.

To check — and you should — that your preparer is legit, go to irs.gov and search for “Directory of Federal Tax Return Preparers with Credentials and Select Qualifications.”

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● You are asked to sign a blank or partially filled-out tax return. Doing your taxes involves a seemingly endless list of boxes and lines. So it may sound reasonable if your tax preparer says, “This is going to take a lot of time, so just sign your return and I’ll fill in the rest of the information later.” Don’t do it.

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● You aren’t asked to provide a W-2 or other proof of your earnings, deductions or credits. And certainly, you shouldn’t agree to any false documentation, no matter how desperate you are for a refund.

● Your preparation fee is based on a percentage of your refund. This can lead to a preparer inflating deductions or credits.

● A preparer asks you to pay him or her any taxes or penalties owed.

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If any of these red flags hit home, report the preparer to the IRS using Form 14157. Also file a complaint at Fraud.org, a site run by the NCL.

“No matter who prepares your taxes for you — whether it’s a multibillion-dollar tax software company, a trusted accountant or a fraudster — it’s the taxpayer who is ultimately responsible for what is on the return,” said John Breyault, NCL vice president for public policy, telecommunications and fraud. “Unfortunately, too many consumers trust tax preparers they shouldn’t. Then, when the IRS comes knocking, it’s the unfortunate taxpayer who’s on the hook for fees and penalties, not the scammer.”

Breyault said fraudsters often pop up in storefronts in underserved areas around tax time and then disappear just as quickly.

Be careful. Choose your preparer wisely or suffer the expensive consequences.