Yes. The deadline set by employers for submitting investment declarations to claim deductions under sections 80C, 80D, 80E and so on is January or February. However, many employees fail to meet the deadline for submitting proof of tax-saving investments. As a result, a higher amount of tax is deducted from the salary during the last three months of the financial year. If you missed submitting such proof earlier, you can enter the details in your tax return form and claim the deductions and refunds for any excess tax deducted.