Many taxpayers in Burbank and across California fall into common tax mistakes like filing late, making math errors, forgetting to report side income or investments, claiming the wrong deductions or credits, using the wrong filing status, overlooking retirement contributions, mixing business and personal expenses, failing to sign or properly e-file returns, or keeping poor records. These slip-ups may seem small but can trigger IRS notices, audits, or penalties, making careful filing and professional guidance essential.