Form 16: Form 16 is a certificate issued by employers to their employees. It provides details of the salary earned during the financial year and the tax deducted at source (TDS) on the salary by the employer. It also includes information about any other income, deductions claimed by the employee, and the net tax payable or refundable. Form 16 is generally issued annually, and employees use it to file their income tax returns.

Form 10A: Form 10A is a declaration form used for claiming an exemption under Section 10(23C), Section 10(23C)(vi), Section 10(23C)(via), Section 10(23C)(vib), Section 10(23C)(vic), Section 10(23C)(vica), Section 10(23D), or Section 11 of the Income Tax Act. This form is applicable to entities like charitable or religious institutions, educational institutions, hospitals, etc., seeking tax exemption under these provisions.

Form 10AB: Form 10AB is a report to be furnished by a specified entity (such as universities, hospitals, research institutions, etc.) to the tax authorities. It is used to report details of the activities and the fulfillment of conditions under Section 10(23C), Section 10(23C)(iv), Section 10(23C)(v), or Section 10(23C)(va) of the Income Tax Act to claim tax exemption.

Form 10BD: Form 10BD is a report to be furnished by a specified entity (like news agencies, associations, scientific research organizations, etc.) to the tax authorities. It is used to report details of the activities and the fulfillment of conditions under Section 10(46) of the Income Tax Act to claim tax exemption.