The Biggest Tax Myths You Should Stop Believing

Tax myths are dangerous. Not because they are harmless lies, but because they cost you real money. Many people rely on advice from friends, social media, or outdated beliefs without realizing that some of it is simply wrong.

In this article, we’ll break down the most common tax myths in a clear and simple way so you can avoid mistakes and manage your money smarter.

This is one of the most common misunderstandings about taxes.

Many people think that moving into a higher tax bracket means their entire income is taxed at a higher rate. That’s not how it works.

Most systems use progressive taxation, which means:

• Only the portion of income above a certain threshold is taxed at a higher rate

Example (simplified):

• First part of your income → lower rate
• Next part → slightly higher rate

Reality:

Earning more money will always result in taking home more money not less.

This myth costs people thousands. "I should buy a new truck for my business because I can write it off."

A deduction reduces your taxable income. It does not make the purchase free.

Example: You earn €60,000. You buy a €10,000 truck for your business. Your taxable income drops to €50,000. You save roughly €2,000–3,000 in taxes (depending on your tax rate). But you still spent €10,000 to save €3,000. You are out €7,000.

The rule: Only buy something if you actually need it and would buy it anyway. Never spend a euro to save 25 cents in taxes. That is math failure.

This is dangerous and wrong.

The €600 (or $600 in the US) rule is about reporting, not taxes. If you earn €600 or more from a client, they must send you a 1099 form. If you earn less than €600, they do not have to send a form.

But you must report every euro of side hustle income on your tax return, regardless of amount. That €300 from dog sitting? Taxable. That €150 from selling printables on Etsy? Taxable.

What happens if you hide it: The IRS may not notice small amounts. Or they might. Audits happen. Penalties and interest add up. And if you eventually build a real side business, you have a history of non-reporting.

Report everything. Pay the small tax. Sleep well.

Getting a tax refund feels great—but it’s not a bonus.

A refund means:

• You paid more tax than necessary during the year
• The government is simply returning your own money

Reality:

It’s better to manage your taxes properly so you keep more of your money throughout the year instead of waiting for a refund.

This was more true decades ago. Today, for most couples, marriage is tax-neutral or even beneficial.

The current reality in most countries:

• Two similar incomes: Roughly the same tax as being single (maybe a small penalty at very high incomes).
• Two different incomes (one high, one low): Marriage usually lowers your taxes. The higher earner's income fills the lower earner's unused lower tax brackets.
• One income only: Marriage significantly lowers your taxes (often called a "marriage bonus").

Example (US 2025 rates): One person earns €100,000, the other earns €0. Single filer pays roughly €18,000. Married filing jointly pays roughly €13,500. That is a €4,500 bonus.

Do not fear marriage because of outdated tax myths. Run the actual numbers for your situation.

The IRS and tax authorities already know about most of your income, even without forms.

Banks report interest. Employers report wages. Payment platforms (PayPal, Venmo, CashApp) report transactions over certain thresholds. The IRS has all this data linked to your Social Security number or tax ID.

If you do not file: Their computer matches the data they have against who filed. When they see income with no return, they send a letter. Or they file a substitute return for you (which never includes deductions you qualify for). Then you owe more.

If you earned below the filing threshold, you truly do not need to file. But check the threshold first. It is higher than most people think.

Some people avoid professional help to save money—but this can backfire.

An accountant can:

• Help you find deductions
• Ensure compliance
• Save you time and stress

Reality:

In some cases, an accountant can actually save you more money than they cost

This fear stops many people from handling their taxes properly.

The truth is:

• Honest mistakes are usually not treated the same as intentional fraud
• Most tax systems allow corrections

Reality: It’s better to file with small errors (and fix them) than to avoid taxes completely.

Tax myths cost you money when you make decisions based on wrong information.

By letting go of these common myths, you can:

• Avoid costly mistakes
• Make smarter financial decisions
• Feel more confident managing your money

The more you understand, the more control you have.