The excess TDS Deducted will be paid as refund with interest to the Person . In case of companies , the employer should have details for deduction of TDS and if excess TDS Deducted , they can show to the Dept that the Documents where received late.But the supporting paper are to be kept by the employer.

Normally the income tax department asks for the document of 80 C in Scrutiny u/s 143 

no need to submit any documents while filing return, department will ask for documents while scrutinising the case

Its necessary for every assesse to file his return showing the true scenario. Its not compulsory to possess the documents at the time of filing return but it should be shown when IT Department scrutinizes the case.

Generally companies take the  supporting vouchers, bills etc during the 1st qrt, and also request to provide the same if they have not  provided earlier  by feb month  of last qrt of financial year so that if excess TDS has made due to insufficient information can be adjusted in the last qtr.. so set a policy for your company so that this problem of excess deduction of TDS can be solved.

But make sure that all the vouchers, bills are provided to you and keep them with you as evidence.

Vouchers bad bills such as.

1. Rent paid receipts .

2. LIC receipts.

3. Mutual fund receipts if any.

4. School fees & Tution  receipts.

5.  Repayment of Housing loan receipts.

any other information provided by the employee...

Thanks for all the responses. One thing came to my mind while wondering how does ITax dept check if the assessee is cheating while claiming 80C deductions is that now a days in all high amount transactions which can lead to 80C deductions, we are asked to submit PAN card copy. Probably they can track all such transactions using PAN and check themselves whether the assessee is cheating or not. Do other agree?

Also probably there is some misunderstanding among common people regarding summon served to some assessee from Itax officials. Immediately others start thinking that the person must have done something illegal and is going to be punished. So this becomes a stigma. I may be wrong but it seems to me merely indicative of the fact that IT dept is unclear about deductions claims made in the IT return. So they need clarifications. (If there were some method to submit documents, or they could verify using PAN record perhaps this problem would have not arisen). I am sure for this Fin year I going to be served a notice (as mentioned u/s 143) since I am likely to pay registration fee+stamp duty for purchase of a flat and I will claim huge deduction while submitting return. (Right now I am unable to provide any document to my employer (state govt.) so excess TDS will be deducted in the last quarter). Please give your opinions whether I am correct or not. Thanks for sharing your advices.