May 10 , 2013
Form 16 and form16A are certificates for TDS on salary and other sources of income respectively. Form 16 is furnished by employers once a year and Form 16A is provided in every quarter if TDS has been applied on your income. After TDS is applied the amount is deposited at government's account and you get credited for income tax paid.
But sometimes if there is delay in your deductor furnishing the certificates you might like to check online if all details filled in it are correct because they are proofs of your tax payment. You can view both form 16 and form 16A at NSDL TIN website by providing certain details.
TDS form 16A verification