Sometimes people do not pay their taxes. 
Sometimes people do not pay their taxes. 
This is called tax evasion. It is different from tax avoidance. Tax avoidance is using laws to pay less. That is allowed by the law.
Some people hide money in secret places. Others might give bribes to officials. This is very wrong. It makes things hard for a country.
Governments try to stop this. They use rules to catch people. They want everyone to be fair. 
Following the rules helps everyone. It helps the world stay fair.
Tax evasion is when people or companies break the law to avoid paying taxes. 
There is a difference between evasion and avoidance. Tax avoidance is using legal ways to pay less. Tax evasion is illegal. Both can happen with large companies or single people.
Experts study why people do this. Some people feel the government does not use tax money well. Others think they can get away with it without being caught. A study in 2017 found that the richest people are more likely to evade taxes. In the U.S., the top 5% of earners are responsible for over half of unpaid taxes.
Governments work hard to stop this. They use audits to check records. In the past, some used tax farming. This is when a private group collects taxes for the state. This can sometimes lead to problems or even big changes in a country.
Tax evasion is an illegal way to avoid paying taxes. 

There are many ways this happens in the real world. Importers sometimes try to avoid customs duties on goods. They might list a lower price on their paperwork. They might also describe a product incorrectly to pay a lower rate. This is called under-invoicing or misdeclaration. Smuggling is another way people avoid these taxes. Smugglers move goods secretly so they do not have to make a declaration. Some people also try to avoid sales taxes or value-added taxes. This often happens when people buy things in places with lower tax rates.
Experts have studied why people choose to evade taxes for a long time. In 1968, economist Gary Becker wrote about the economics of crime. Later, in 1972, Michael G. Allingham and Agnar Sandmo made a model for income tax evasion. Their model looked at how people decide how much money to hide. It showed that the risk of being caught matters a lot. People also look at how much punishment the law gives. Other studies show people comply more if they trust the government. They want to know their tax money is used well.
Recent studies have found some very interesting facts about wealth and taxes. A 2017 study by Alstadsæter and others used leaked data. They found that tax evasion rises as wealth increases. The richest 0.01% of people are ten times more likely to evade taxes. These people might evade as much as 25% of their taxes. In the United States, the top 5% of earners are responsible for over half of unpaid taxes.
Governments use many tools to try to stop tax evasion. In the UK, the agency HMRC aimed to collect £18 billion by 2015. They even started a program in 2010 to help people pay what they owed. Some countries used a system called tax farming. This is when a private group collects taxes for the government. This happened in the past and even led to the French Revolution. Today, agencies like Cotecna help inspect goods to prevent fraud. Governments continue to look for better ways to keep the system fair.
Tax evasion, also known as tax fraud, is an illegal attempt to avoid paying taxes. 
There are many specific ways that people and businesses commit tax evasion. Some may overstate their deductions to make it look like they have less money to tax. Others might use bribes to influence officials or hide money in secret locations. In international trade, importers often attempt to evade customs duties. They might use under-invoicing, which means listing a lower price on paperwork than what was actually paid. They might also use misdeclaration, where they describe a product incorrectly to match a lower tax rate. Smuggling is another method used to avoid customs duties entirely by moving goods through covert transport without making any official declarations.
Consumption taxes, such as value-added tax (VAT) or sales taxes, are also targets for evasion. In the second half of the 20th century, VAT became a common modern consumption tax globally. Producers might evade this tax by under-reporting the total amount of sales they make to consumers. In federal countries like the United States and Canada, people may also try to avoid local sales taxes. This often happens when consumers buy items in a jurisdiction with lower tax rates. Because liberal democracies often have few border controls between internal regions, it is difficult to enforce these rules on low-value goods carried in private vehicles. However, governments still try to collect sales tax on high-value items like cars.
Economists have spent decades trying to understand the mechanics of why people choose to evade taxes. In 1968, Nobel laureate Gary Becker developed theories regarding the economics of crime. Building on this, Michael G. Allingham and Agnar Sandmo created an economic model in 1972. Their model focused on the evasion of income tax, which is a primary revenue source for developed nations. They studied how a risk-averse person decides how much income to keep undeclared. Their research suggested that evasion levels depend on the probability of being detected, the severity of legal punishment, and how much a person dislikes risk. Later studies added that people are more likely to comply if they believe tax money is used appropriately.
Recent research has provided specific data on how wealth relates to tax evasion. A 2017 study by Alstadsæter and colleagues used leaked data and random audits to find significant patterns. They concluded that the occurrence of tax evasion rises sharply as the amount of wealth increases. Specifically, the richest 0.01% of people are about 10 times more likely to engage in tax evasion than the average person. These wealthy individuals may evade as much as 25% of their required taxes. In the United States, the Treasury Department has noted that the top 5% of earners are responsible for over half of all unpaid taxes.
Tax authorities use the term "tax gap" to measure the extent of unpaid taxes. The gross tax gap is the difference between the true tax liability and the taxes actually paid on time. This gap is made up of three parts: the non-filing gap, the underreporting gap, and the underpayment gap. In the U.S., voluntary compliance is approximately 85%, leaving a gross tax gap of about 15%. This gap grows due to two main factors: a lack of enforcement and a lack of compliance. Enforcement is often difficult because it is very costly for the government to enforce taxation laws. Compliance is also difficult because filing taxes and managing bureaucracy can be costly for individuals and firms.
Governments use various strategies to combat these illegal activities and increase revenue. Some countries have explored the privatization of tax enforcement to increase efficiency. In the United Kingdom, the agency HMRC set a goal to collect £18 billion in revenue by 2015 through crackdowns. In 2010, they also ran a voluntary amnesty program for professionals, which raised £500 million. Historically, some governments used "tax farming," where private entities collected revenue in exchange for a lump sum. However, this system was prone to abuse by collectors seeking profit. In fact, abuses by tax farmers were a primary cause of the French Revolution.
To prevent fraud in international shipping, some governments use pre-shipment inspection agencies. These agencies, such as Cotecna, work to prevent evasion of customs duties through under-invoicing or misdeclaration. Despite these efforts, corruption by tax officials remains a major obstacle. Corrupt officials may accept bribes to refrain from reporting instances of evasion. This makes it much harder for tax administrations to control the flow of money. Ultimately, the level of evasion in a society is tied to the efficiency of its administration and the perceived fairness of the social exchange between taxpayers and the state.
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