14 Times a Typo Cost Companies Millions
When we think about costly business mistakes, we rarely consider the humble typo. Yet throughout history, these small errors have caused massive financial damage. A misplaced comma or omitted character might seem trivial, but in certain contexts, they can trigger a cascade of consequences worth millions.
Here is a list of 14 of the most expensive typos that ever slipped past proofreaders and editors.
NASA’s Missing Hyphen
In 1962, NASA launched the Mariner 1 spacecraft toward Venus as America’s first interplanetary mission. Just 293 seconds after liftoff, ground control had to destroy the rocket when it veered dangerously off course. The culprit? A missing hyphen (or overbar) in the guidance software’s handwritten code that caused incorrect velocity calculations, making the spacecraft uncontrollable. This single character error cost NASA approximately $18.5 million at the time (around $185-190 million in today’s dollars).
Mizuho’s Decimal Disaster
In December 2005, Mizuho Securities of Japan experienced one of the financial world’s most notorious typos. A trader accidentally entered an order to sell 610,000 shares of recruiting company J-Com at 1 yen each, when they actually meant to sell 1 share at 610,000 yen. Despite frantic attempts to cancel the erroneous trade, the Tokyo Stock Exchange’s system prevented the correction, forcing Mizuho to buy back shares at higher prices, ultimately costing the company approximately $224-250 million.
The Taylor & Sons Catastrophe
In 2009, a seemingly minor typographical error destroyed a thriving 124-year-old Welsh engineering firm. Companies House, the UK’s registrar of companies, mistakenly recorded that ‘Taylor & Sons Ltd’ had gone into liquidation, when it was actually ‘Taylor & Son Ltd’ (without the ‘s’) that had gone under. Though corrected three days later, the error had already spread to credit reference agencies, causing suppliers to terminate orders and banks to withdraw credit facilities. The company collapsed, and after a court battle, the UK government was ordered to pay £8.8 million (approximately $11.5 million) in damages.
Alitalia’s $7 Million Fare Mistake
In 2006, Italian airline Alitalia made a pricing error that travelers quickly exploited. The airline accidentally listed business-class flights from Toronto to Cyprus at $39 instead of $3,900. Before the error was corrected, approximately 2,000 travelers booked tickets at this bargain price. When Alitalia tried to cancel the tickets, the public outcry was so severe that the airline honored the mistaken fares to preserve its reputation, resulting in losses of about $7.2 million.
The Lockheed Martin Comma Blunder
In 1999, aerospace giant Lockheed Martin made a costly punctuation error in a sales contract. The company misplaced a comma in an equation designed to adjust the sales price of aircraft for inflation. As a Lockheed leader later lamented, “This comma cost our company $70 million.” The tiny error in the placement of a decimal point resulted in aircraft being sold at significantly lower prices than intended.
The $38 Million Government Comma
In 1872, the U.S. government passed the Tariff Act, which included a list of items exempt from import taxes. The original intent was to exempt “fruit plants, tropical and semi-tropical for the purpose of propagation or cultivation,” but a clerk’s error placed a comma after “fruit,” making it read “fruit, plants tropical and semi-tropical.” This misplaced comma was interpreted to mean that all tropical fruits were exempt from tariffs. The error cost the government approximately $2 million (about $38-40 million in today’s dollars) in lost revenue before it was corrected two years later.
The Banner Travel Agency Mix-up
In the late 1980s, a small typo transformed the reputation of a California travel agency. Banner Travel Services placed an ad in the Yellow Pages to promote their specialty in “exotic travel” options, but Pacific Bell mistakenly printed it as “erotic travel destinations.” The owner claimed the error cost the agency 80% of its clientele, particularly elderly customers. Pacific Bell waived the monthly ad fee, but the travel agency sued for $10 million in damages.
New York City’s $1.4 Million Letter
In 2006, the New York City Department of Education fell victim to a simple typing error. The city comptroller accidentally inserted an extra letter in a document, causing the accounting software to misinterpret it. This resulted in the department spending $2.8 million on transportation when the budget was only $1.4 million, doubling the intended expenditure.
The Roswell Scratch Card Fiasco
A car dealership in Roswell, New Mexico created a promotion that went terribly wrong. In 2007, they mailed out 50,000 scratch tickets, intending for only one to reveal a $1,000 grand prize. However, the marketing company mistakenly printed all 50,000 tickets as winners. Unable to honor the $50 million debt, the dealership offered $5 Walmart gift cards to ticket holders instead, costing them $250,000 and significant reputational damage.
The Chilean Trading Disaster
In 1994, an unfortunate keyboard slip led to massive losses for a Chilean government-owned company. Juan Pablo Davila, a copper trader for Codelco, mistakenly bought stocks he was trying to sell when he mistyped a trading command. After realizing his error, he panicked and went on a frenzied trading spree that ultimately cost the company $175 million. The incident became so notorious that a new Spanish verb, “davilar,” was coined to describe a catastrophic blunder.
The Wasatch County Tax Nightmare
A simple typo caused major budget problems for a Utah county in 2019. In Wasatch County, a house valued at $302,000 was accidentally recorded in tax rolls at nearly $1 billion, an overvaluation of about $543 million. According to county officials, a staff member may have dropped a phone on their keyboard, creating the error. The mistake led to a $6 million countywide overvaluation, causing revenue shortfalls across five different taxing entities.
The Oxford Comma Case
In 2017, a missing comma in Maine state law led to a major legal battle and settlement. The law listed activities not qualifying for overtime pay, including “the canning, processing, preserving, freezing, drying, marketing, storing, packing for shipment or distribution of” perishable foods. Without a comma between “shipment” and “or,” dairy delivery drivers successfully argued that “packing for shipment or distribution” was one activity they didn’t perform, making them eligible for overtime. The company, Oakhurst Dairy, ended up settling the case for $5 million.
Macy’s Catalog Catastrophe
A simple decimal point error in a retail catalog led to a shopping frenzy. Macy’s accidentally listed a $1,500 necklace on sale for $47 instead of the intended $497. Once the mistake was discovered, the entire inventory had already been sold, costing the retail giant about $450 per necklace. The typo resulted in tens of thousands of dollars in losses before the company caught the error.
Amazon’s Cloud Computing Outage
In 2017, a simple typing mistake caused widespread internet disruptions. A typo in debugging code triggered a crippling server disruption for Amazon Web Services, affecting numerous businesses and services across the internet. The error cost Amazon’s business customers an estimated $150 million in lost revenue and productivity.
When Proofreading Pays Off
The financial impact of these errors goes far beyond their immediate costs. Many caused lasting reputational damage, and some even destroyed businesses entirely. They serve as stark reminders that attention to detail isn’t just about professionalism—it’s a crucial financial safeguard.
What’s particularly striking about these expensive typos is how preventable they were. In most cases, a second pair of eyes or an automated verification system could have caught the mistakes before they wreaked havoc. Yet in the rush to publish, approve, or execute, these critical steps were sometimes skipped.
Today’s organizations have learned from these costly lessons, implementing multiple layers of checks and verification procedures for sensitive documents and systems. These historical blunders remind us that sometimes the smallest mistakes carry the biggest price tags.
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