The laws of the United States require all individuals to file a tax return and report income earned during the calendar year if you earn income over a filing threshold. If you do not file a tax return timely, you could accrue interest and penalties on already owed tax liability amounts, making your out-of-pocket expense even greater.
Furthermore, not filing returns when required could prevent you from obtaining a visa in the future. If you plan to apply for a U.S. visa in the future, or a change of status, you may be required to pay any unpaid tax, along with interest and penalties before you can obtain the visa. Filing your tax return on time prevents any delay you may experience in obtaining a visa and reduces the overall out-of-pocket amounts you would otherwise have to pay.