what is the due date for filing inc tax retn of npo? is tax audit applicable to npo,the way it is appl to companies?

I have received a certificate u/s 197 from client for non deduction of tax and it contains amount, tax rate and period of validity. I want to know that if i received / booked a bill or paid a particular amount to that client after deduction of tax prior to the validity period mentioned in that certificate according to tds tax rates. should i have to reverse that tds entry.

For example i have a bill dt 1.4.2014 of 1000/- and deducted tax @ 10%- rs. 100/-. and i received a certificate with validity frm 30-4-2014 to 31-3-15. should i reverse the tds entry or it is right.

sir I am preparing one balace sheet in debit side I got balace 1910141 but in credit side I got after adding profit i got 2000000 so but i can dedut from this amount one is drawing and other is

if we pay INR 40,000.00 for advertise, then we responsible for tds deduction or not ??

Mr A Hold 50% share in A Ltd, Mr B (Brother of Mr A) is KMP in B Ltd.

Whether B Ltd is Related Party for Reporting Entity M/s A Ltd?

how many times (maximum) i pay salary a particular staff member in a month.
example: x's salary 10000/-
i pay 6.1.2014 - 3000
15.1.2014 - 3000
30.1.2014 - 4000.

what are the things to be followed while doing accounting of jewellers? ?

we have donated old computers and laptops to charitable organization in the month of December 2013. whether we have to calculate depreciation up to December or not.

sir,

i am a student.

i am always confused, preparation of debtor & creditor ledger.

any easy way to avoid confusion.

thanks.

please specify Diff. between working capital, capital employed & net worth I am confused in above