TDS made during a month is to be deposited upto 7th of next month...
Exception - TDS made on 31st march can be deposited upto 31 May of that year.. and at last upto the date of return filing (with interest) so that the exp is allowed in the same year..
However, if the TDS on a payment which is made on 31 march, is not covered by this exception & the same is to be deposited upto 7 april..
regarding Returns & Form nos. ur query is still open