How to Identify a Fake $20 Dollar Bill

$20 Bill Security Features Verification Checklist

Security Features of a Genuine $20 Bill

A genuine $20 note carries several security features designed to prevent counterfeiting and allow rapid verification without special equipment. The most important are a security thread, a watermark of President Andrew Jackson, and colour-shifting ink¹. These features were introduced in the 2003 redesign of the $20 bill, along with a larger portrait and microprinted text². Together, they form a layered defence: each feature exploits a different technical challenge that counterfeiters struggle to replicate, and checking all of them in sequence gives you confidence that a note is authentic.

Why do these features matter? Counterfeiters often focus on visual appearance—matching the colour, texture, and layout of a genuine note—but they rarely invest in reproducing the embedded security elements. A fake $20 bill may look convincing at first glance, yet fail immediately when you hold it to light or tilt it under a lamp. By learning to check the security thread, watermark, colour-shifting ink, and microprinted text, you can identify most counterfeits in seconds, without relying on feel or intuition alone.

The security thread is an embedded strip running vertically through the note, positioned to the left of President Andrew Jackson's portrait. Hold the note to light: you should see the thread from both sides, imprinted with the text "USA TWENTY" and a small flag pattern³. The thread is woven into the paper during manufacture, not printed on the surface. If you illuminate the note with ultraviolet light, the thread glows green³. This combination—visible text and UV fluorescence—is difficult for counterfeiters to reproduce, because it requires specialised materials and manufacturing processes unavailable to most forgers.

The watermark is a faint image of President Andrew Jackson that appears when you hold the note to light. It is embedded in the paper itself, not printed on top, and is visible from both sides. The watermark should match the portrait printed on the note's surface¹. If the watermark is missing, or if it shows a different image, the note is counterfeit. Watermarks are produced during the paper-making process and cannot be added later by printing or photocopying.

Colour-shifting ink is applied to the numeral "20" in the lower right corner of the note's front side. Tilt the note back and forth under a light source: the numeral should shift from copper to green smoothly and vividly³. This effect works in daylight, under fluorescent lamps, or with incandescent bulbs. The ink was introduced in the 2003 redesign² and serves as a front-line check that anyone can perform without tools. Many counterfeits use static ink that mimics either the copper or green colour but cannot shift between the two.

Microprinted text appears along the border of the first three letters of the blue "TWENTY USA" ribbon to the right of the portrait. The text reads "USA20" and is extremely small—often requiring a magnifying glass or loupe to read clearly³. Genuine microprinting appears sharp and legible under magnification, with clean edges and consistent letter spacing. Counterfeit notes typically show blurred, broken, or missing microprint, because consumer printers and photocopiers lack the resolution to render such fine detail.

For a broader overview of counterfeit detection across denominations, see Understanding Fake Dollar Bills: Key Features.

How to Check the Security Thread With Light

The security thread is one of the most reliable features for verifying a genuine $20 bill. It is an embedded strip running vertically through the note, positioned to the left of President Andrew Jackson's portrait. Unlike printed elements, the thread is woven into the paper during manufacture, making it exceptionally difficult for counterfeiters to replicate convincingly.

To check the thread, hold the note up to a light source—daylight, a lamp, or even the backlight of a smartphone screen will work. Look for a thin vertical line running through the paper. The thread should be visible from both sides of the note and imprinted with the text "USA TWENTY" and a small flag pattern in an alternating sequence³. The text and flag are part of the thread itself, not printed on the surface. If you cannot see the thread when holding the note to light, or if the thread appears to be printed on top of the paper rather than embedded within it, the note is counterfeit.

Why does this matter? Counterfeiters often attempt to mimic the security thread by printing a line or strip on the surface of the paper, but this approach fails the light test immediately. A genuine thread is woven into the fibres during paper production at the Bureau of Engraving and Printing, and it remains visible from both sides when backlit. A printed imitation will appear only on one side, or it will lack the crisp detail of the "USA TWENTY" text and flag pattern. Holding the note to light takes only a few seconds and reveals this difference clearly.

UV Light Verification

The security thread also glows green when illuminated by ultraviolet light³. This feature provides a second layer of verification that is especially useful in low-light environments or when handling large volumes of cash. To perform this check, place the note under a UV lamp—commonly available as handheld devices or desktop units designed for currency verification. The thread should emit a bright green glow. If the thread does not glow, or if it glows a different colour, the note is suspect.

UV verification is rapid and unambiguous. Genuine security threads contain phosphorescent compounds that fluoresce green under UV exposure, a feature that requires specialised materials not accessible to most counterfeiters. If you handle cash regularly—at a retail counter, in hospitality, or in any cash-intensive setting—a UV lamp is a practical investment. The check takes seconds and eliminates doubt when combined with the visible light test.

Combine the security thread checks with the other features described in this guide. A genuine $20 bill will pass all tests: the thread will show "USA TWENTY" and glow green under UV light, the watermark will appear when held to light, the numeral "20" will shift from copper to green when tilted, and the microprinted text will be sharp under magnification. If a note fails the security thread test—whether under visible light or UV—do not accept it, and follow your local procedures for reporting suspected counterfeits.

Using UV Light to Verify Authenticity

Ultraviolet light provides one of the fastest and most reliable methods for verifying a genuine $20 bill. When you illuminate the security thread with a UV lamp, it glows bright green³. This fluorescence is produced by phosphorescent compounds embedded in the thread during manufacture—materials that are not available to most counterfeiters and cannot be replicated by printing or photocopying. The UV check complements the visible-light inspection of the thread and offers a clear yes-or-no answer: if the thread glows green, the note passes this test; if it does not glow, or if it glows a different colour, the note is suspect.

Why does UV verification matter? Many counterfeit notes attempt to mimic the appearance of the security thread by printing a line or strip on the surface of the paper. Under ordinary light, these imitations may look convincing, especially if the counterfeiter has matched the colour and position of the genuine thread. Under UV light, however, the difference is immediate. A genuine thread emits a vivid green glow, while a printed imitation typically shows no fluorescence at all, or glows white or blue if the paper itself contains optical brighteners. This distinction allows you to identify counterfeits in seconds, even in low-light environments where visual inspection is difficult.

How to Perform the UV Check

To verify the security thread with UV light, you need a UV lamp designed for currency verification. These devices are widely available as handheld torches or desktop units and emit light in the ultraviolet-A spectrum, typically around 365 nanometres. Place the $20 note flat on a surface, or hold it steady under the lamp. Direct the UV light at the area to the left of President Andrew Jackson's portrait, where the security thread is embedded. The thread should glow bright green along its entire length³. The glow should be uniform and vivid; if the thread appears faint, patchy, or absent, the note is likely counterfeit.

Combine the UV check with the visible-light inspection described earlier. First, hold the note to light to confirm that the thread is embedded in the paper and imprinted with "USA TWENTY" and a small flag pattern³. Then, illuminate the same thread with UV light to verify the green glow. This two-step process confirms both the physical structure of the thread and its chemical composition, making it extremely difficult for counterfeiters to pass both tests.

UV verification is especially useful when handling large volumes of cash or working in environments where rapid authentication is essential—retail counters, hospitality venues, or cash-intensive businesses. A UV lamp is a practical investment if you regularly accept $20 notes, and the check takes only a few seconds per note. If you do not have a UV lamp, consider acquiring one; handheld models are affordable and portable, and they work for all U.S. currency denominations, each of which has a security thread that glows a specific colour under UV light.

What to Do if the Thread Does Not Glow Green

If the security thread does not glow green under UV light, do not accept the note. The absence of green fluorescence indicates that the thread is either missing, printed on the surface, or made from materials that do not contain the required phosphorescent compounds. In any of these cases, the note is counterfeit. Politely decline the transaction and follow your organisation's procedures for handling suspected counterfeits—typically, this involves setting the note aside, notifying a supervisor, and reporting the incident to local law enforcement or the U.S. Secret Service.

Do not attempt to return the note to the person who presented it, as this may alert them and allow them to pass the counterfeit elsewhere. Instead, secure the note and document the circumstances: the time, location, and any details about the transaction. If you are unsure whether the note is genuine, compare it with a known genuine $20 bill under the same UV lamp. A side-by-side comparison will show the difference clearly.

For guidance on identifying counterfeits across other denominations, see Understanding Fake Dollar Bills: Key Features.

Testing the Color-Shifting Ink

Color-shifting ink provides a quick, tool-free method to verify a genuine $20 bill. The numeral "20" in the lower right corner of the note's front side is printed with ink that changes colour when you tilt the note. Hold the note flat under a light source—daylight, a desk lamp, or overhead fluorescent lighting—and observe the numeral. Then tilt the note slowly back and forth. The "20" should shift from copper to green smoothly and vividly³. This effect is visible at almost any angle and works under most lighting conditions, making it one of the most accessible security features for everyday use.

Why does this matter? Counterfeiters typically use standard printing inks that cannot replicate the colour-shift effect. A fake note may print the numeral in either copper or green, or attempt to mimic the transition with a gradient, but it will not shift dynamically as you tilt the note. The genuine ink contains optically variable pigments that reflect different wavelengths of light depending on the viewing angle—a technology that requires specialised materials and equipment not available to most counterfeiters. Checking the colour shift takes only a few seconds and requires no tools, yet it reliably distinguishes genuine notes from many common counterfeits.

How to Perform the Tilt Test

To check the colour-shifting ink, hold the $20 note by its edges so that the front side faces you and the numeral "20" in the lower right corner is clearly visible. Position the note under a light source—natural daylight from a window, a fluorescent ceiling fixture, or an incandescent bulb all work well. Tilt the note slowly towards you, then away from you, keeping the light source steady. Watch the numeral "20" as you tilt: it should shift from a copper tone (a warm, reddish-brown hue) to a green tone (a vivid, emerald-like colour)³. The transition should be smooth and continuous, not abrupt or patchy.

If the numeral remains a single colour throughout the tilt, or if the colour change is faint or inconsistent, the note is likely counterfeit. Genuine colour-shifting ink produces a clear, vivid transition that is immediately noticeable. Compare the suspect note with a known genuine $20 bill if you have one available. Hold both notes side by side under the same light and tilt them together; the difference between genuine colour-shifting ink and static printed ink will be obvious.

The colour-shifting ink was introduced in the 2003 redesign of the $20 note² and has been a standard feature ever since. If you are examining an older $20 bill issued before 2003, it will not have this feature, but it should still display other security elements appropriate to its series year. For notes issued in 2003 or later, the absence of colour-shifting ink is a strong indicator of counterfeiting.

What the Colour Shift Reveals

The colour shift from copper to green is not merely decorative; it serves as a front-line authentication check that anyone can perform without specialised equipment. The optically variable ink used in genuine notes reflects light differently depending on the angle of view, producing the colour change. This effect cannot be reproduced by photocopiers, inkjet printers, or offset printing presses commonly used by counterfeiters. Even high-resolution colour printers will produce a static image that does not shift when tilted.

When you tilt a genuine $20 note, the colour shift should be vivid and unmistakable. If the transition is subtle, or if the numeral appears to be printed in a gradient that does not change with angle, the note is suspect. Genuine colour-shifting ink reflects light actively; counterfeit attempts typically rely on static gradients or overlays that may look plausible when viewed straight-on but fail the tilt test immediately.

Combine the colour-shift check with the other security features described in this guide. A genuine $20 bill will pass all tests: the numeral "20" will shift from copper to green when tilted, the security thread will be embedded and glow green under UV light, the watermark will appear when held to light, and the microprinted text will be sharp under magnification. If a note fails the colour-shift test, do not accept it, and follow your local procedures for reporting suspected counterfeits.

Examining the Microprinted Text

Microprinted text offers another layer of authentication that is difficult for counterfeiters to replicate with standard printing equipment. The $20 note includes the text "USA20" microprinted along the border of the first three letters of the blue "TWENTY USA" ribbon to the right of President Andrew Jackson's portrait³. This text is extremely small—typically less than 0.25 millimetres in height—and appears as a fine line to the naked eye. Under magnification, however, the letters should be sharp, distinct, and evenly spaced. Counterfeit notes often fail this test because consumer-grade printers and photocopiers cannot reproduce such fine detail; the microprinted text on a fake note will appear as a blurred line, a series of dots, or an uneven smudge when magnified.

Why does microprinting matter? The precision required to print legible text at this scale demands specialised intaglio printing presses and high-quality engraving—resources that are not available to most counterfeiters. Even high-resolution colour printers struggle to reproduce microprinted text accurately. When you examine a genuine $20 bill under magnification, the letters "USA20" should be crisp and readable, with clean edges and consistent spacing. On a counterfeit note, the same area will typically show a fuzzy line or a series of disconnected marks that do not resolve into legible text. This difference is immediately visible under a magnifying glass or jeweller's loupe and provides a quick, reliable authentication check.

How to Check the Microprinted Text

To examine the microprinted text, you need a magnifying glass, a jeweller's loupe, or a smartphone camera with a macro or zoom function. Locate the blue "TWENTY USA" ribbon on the right side of the note's front, adjacent to the portrait. Focus on the border of the first three letters—"TWE"—of the ribbon. The microprinted text "USA20" runs along this border and should be visible as a thin line to the unaided eye³. Place the magnifying glass or loupe over this area and adjust the focus until the text becomes clear. The letters should appear sharp and well-defined, with no blurring or gaps. Each letter should be distinct, and the spacing between letters should be uniform.

If you are using a smartphone, open the camera application and enable macro mode or digital zoom. Position the phone close to the note, ensuring that the area around the "TWE" letters is in focus. Capture a photo or view the live preview on the screen. Zoom in on the image to examine the microprinted text. A genuine note will show crisp, legible letters; a counterfeit will show a blurred or broken line that does not resolve into readable text, even at high magnification.

Compare the suspect note with a known genuine $20 bill if possible. Hold both notes under the same magnification and lighting conditions. The difference between genuine microprinting and a counterfeit attempt is usually stark: genuine text is sharp and uniform, while counterfeit text is fuzzy, incomplete, or absent. This side-by-side comparison eliminates any doubt and provides a clear reference for future checks.

What Microprinting Reveals About a Note's Authenticity

Microprinted text is not merely a decorative detail; it serves as a technical barrier that counterfeiters find difficult to overcome. The intaglio printing process used to produce genuine U.S. currency creates raised ink that can be felt by touch and produces fine lines that remain sharp under magnification. Counterfeit notes, by contrast, are typically produced using offset printing, inkjet printing, or photocopying—methods that cannot achieve the same level of detail. When magnified, counterfeit microprinting often appears as a solid line with no discernible letters, or as a series of dots that approximate the shape of text but lack the precision of genuine engraving.

If the microprinted text on a $20 note is blurred, incomplete, or entirely absent, the note is likely counterfeit. Genuine microprinting should be legible under magnification, with each letter clearly formed and evenly spaced. The text "USA20" should appear along the border of the first three letters of the blue ribbon, exactly as described³. If the text is missing, or if the area shows only a solid line or a pattern of dots, do not accept the note.

Combine the microprinting check with the other security features covered in this guide. A genuine $20 bill will display sharp microprinted text "USA20" along the ribbon border, a security thread embedded to the left of the portrait that glows green under UV light³, a watermark of President Andrew Jackson visible when held to light, and colour-shifting ink in the numeral "20" that shifts from copper to green when tilted³. If a note fails the microprinting test, set it aside and follow your organisation's procedures for handling suspected counterfeits. Do not return the note to the person who presented it; instead, secure it and report the incident to local law enforcement or the U.S. Secret Service.

For additional guidance on identifying counterfeit currency across denominations, see Understanding Fake Dollar Bills: Key Features.

Common Mistakes and Misconceptions

When checking a $20 bill for authenticity, several common pitfalls can lead to incorrect conclusions. We outline these below to help you avoid them.

Relying on Visual Inspection Alone

Many people check a $20 bill by simply looking at it, but this method is unreliable. Counterfeiters can produce high-quality fakes that mimic the colour and texture of genuine currency. To verify authenticity, you must check the security features, such as the embedded thread, watermark, and colour-shifting ink¹.

Ignoring the Security Thread

Some individuals may not know how to check the security thread properly or may overlook it altogether. To verify the thread, hold the note to light and look for the embedded thread running vertically to the left of the portrait. The thread should be imprinted with "USA TWENTY" and a small flag pattern³. If you can't see the thread or if it appears to be printed on the surface, the note is likely counterfeit.

Failing to Use Ultraviolet (UV) Light

UV light is essential for verifying the security thread's authenticity. A genuine $20 bill's thread glows green under UV illumination³. If you don't have a UV lamp, consider investing in one, as it's a practical tool for rapid verification.

Misinterpreting Colour-Shifting Ink

Some counterfeits may mimic the colour-shifting ink, but upon closer inspection, the effect is often inconsistent or absent. To verify the colour-shifting ink, tilt the note back and forth under a light source. The numeral "20" in the lower right corner should shift from copper to green smoothly and vividly³. If the colour shift is faint, inconsistent, or absent, the note is suspect.

Overlooking Microprinted Text

Microprinted text is a security feature that is often overlooked. To verify it, examine the border of the first three letters of the blue "TWENTY USA" ribbon to the right of the portrait using a magnifying glass or loupe. Genuine microprinting appears sharp and legible, while counterfeit notes typically show blurred or missing text³.

Key Takeaways

To ensure a $20 bill is genuine, remember to:

• Check the security thread by holding the note to light and verifying it glows green under UV light
• Tilt the note to see the numeral 20 shift from copper to green
• Look for a watermark of President Andrew Jackson
• Examine the microprinted text "USA20" along the border of the blue "TWENTY USA" ribbon using a magnifying glass
• Combine these checks to verify the note's authenticity

For further guidance on identifying counterfeit currency, visit our article on How to Identify a Fake $50 Dollar Bill.

Evidence and sources

1. Training Course - Security | U.S. Currency Education Program
2. U.S. TREASURY AND FEDERAL RESERVE INTRODUCE NEW $20 BILL
3. $20 Note