How to Spot a Counterfeit Bill

Everyone loves a stash of cash—unless it turns out to be entirely fake.

While modern counterfeiting technology has become increasingly sophisticated, the U.S. Treasury has consistently upped its game by embedding highly advanced, layers of security into our paper currency.

Whether you are clearing out your garage over the weekend, selling a vehicle on a local marketplace, or managing cash drops for a nonprofit fundraiser, you don’t have to guess if a bill is legitimate.

Pull up your mental dashboard and use this straightforward three-step physical inspection guide to verify your cash on the spot:

Phase 1: The Touch Test (Feel the Paper)

• ✋ The Fabric Blend: Legitimate U.S. currency is not printed on standard wood-pulp paper. It is crafted from a premium blend of 75% cotton and 25% linen. It has a distinct, substantial structural “feel” and is noticeably rougher than common office or printing paper.
• ✋ Raised Printing: Run your fingernail gently over the clothing jacket or portrait of the historical figure on the bill. Genuine U.S. currency uses an intaglio printing process that leaves a very slightly raised layer of ink. You should be able to feel that subtle texture.

Phase 2: The Light Test (Hold It Up)

• 💡 The Watermark: Hold the bill up to a natural or overhead light source. A faint, detailed watermark portrait matching the historical figure on the face should be clearly visible from both sides of the bill.
• 💡 The Embedded Security Thread: On any authentic bill of $5 or more, a thin vertical polymer thread is woven directly into the paper substrate. For $10 and $50 bills, this internal thread runs down the right side of the face. For $5, $20, and $100 bills, it sits on the left side.
• 💡 The Ultraviolet Glow: If your business or organization utilizes a standard handheld ultraviolet (UV) blacklight terminal, authentic bills will radiate a highly specific, vibrant color signature:

Phase 3: The Tilt Test (Move the Bill)

• 🔄 Color-Shifting Ink: On any genuine bill of $5 or more, look closely at the numeral printed in the bottom right corner. Tilt the bill slowly back and forth—the ink should cleanly shift its color profile from copper/gold to green, or from green to black.
• 🔄 The 3D Security Ribbon: Look at a modern $100 bill. It features a thick, blue security ribbon woven vertically down the center. This is not printed on the paper; it is part of the fabric. When you tilt the bill up and down, the micro-printed bells and “100” icons inside the ribbon will physically slide from side to side. When you tilt the bill side to side, they move up and down!

What to Do If You Receive a Fake Bill

If a bill fails these baseline authenticity checks, you are likely holding a counterfeit note. The U.S. Secret Service and Treasury Department advise following this exact protocol:

Safety and legal preservation protocol. Order is critical to avoid escalating danger while ensuring law enforcement can track the counterfeit source.

• Your personal safety is infinitely more valuable than any piece of paper. Do not argue with, threaten, or attempt to physically detain the person who handed you the bill.
• If you can safely do so, keep the suspicious bill and do not return it to the passer. Make a quick, quiet mental note of their physical appearance, clothing, any companions, and write down their vehicle’s license plate number if they pull away.
• Handle the counterfeit bill as little as possible to preserve any fingerprint data. Place it immediately inside a clean paper envelope. Write your personal initials and the current date in the plain white border area of the bill, then immediately contact the Abilene Police Department or the local U.S. Secret Service field office to turn over the note.

Protect Your Bottom Line with ATFCU

If you are ever processing a cash transaction or managing a business deposit and a specific bill leaves you feeling uncertain, don’t ignore your gut instinct.

While the credit union cannot legally accept or credit a counterfeit bill to your checking or savings account, our experienced branch lobby teams are always right here to help you audit suspicious security features and keep your cash management habits completely secure. To access our complete reporting guide and protect your data layout from other common fraud channels, explore our security manual: Fraud Resources.

Stay observant, double-check your cash drops, and keep your household financial boundaries completely ironclad!