FORM 16 is provided by the employer. If your employer is deducting TDS from your salary, he is obligated to provide you a Form 16 as per the Income Tax Act. Unfortunately the Form 16 cannot be downloaded anywhere else.
If you have switched jobs in the middle of the year, you will get a Form 16 from your previous employer and your current employer.
Form 16A is a Tax Deducted at source (TDS) certificate issued under Section 203 of the Income Tax Act. The Form 16 is only for salary income and Form 16A is applicable for TDS on income sources other than salary. Form 16A will be issued when TDS is deducted for fixed deposits, for TDS deducted on insurance commissions, on rent receipts, or any other income you may receive on which TDS is deductible.
Form 16C is the TDS certificate which is issued by the Tenant of property to the Landowner of property in respect of TDS deducted on rent under Section 194-IB of the Income-tax Act, 1961.Form 16C is a new TDS certificate introduced by the government of India. It reflects the amount of TDS deducted on rent at 5 % by the individual/HUF (u/s 194IB). The person deducting TDS on rent is required to deposit the TDS along with Form 26QC within 30 days of deducting TDS on rent. In addition, the Form 16C should then be provided to the deductee within 15 days of depositing the TDS and Form 26QC.