Dear SOUVIK BORAL,
1. Rs. 25,000 on 25.05.2010
2. Rs. 25,000 on 14.08.2010
3. Rs. 20,000 on 02.02.2011
4. Rs 15,000 on 25.03.2011
As above given details is very clear to deduct TDS u/s 194C. but, you have to confirm the nature of contract like Contract/ Sub-Contract/ Advertising, Contractor/ Sub-Contractor in Transport Business. because, The Nil rate will be applicable if the transporter quotes his PAN. If PAN is not quoted the rate will be 20%. (Transporter means persons engaged in plying, hiring and leasing of Goods Carriages) and the limit is for individual transaction. However, if aggregate payment to a contractor during the year exceed Rs. 50,000 (Rs. 75,000 w.e.f 1tst July, 2010), then tax will be required to be deducted, even where individual transaction is less than the threshold of Rs. 20,000 (Rs. 30,000 w.e.f. 1st July, 2010).
so, what you said details belongs to Transport contractor. you no need to deduct for whole year, but you have to quote PAN no. of the transporter. in case of contractor you should deduct @ 2% / in case of sub contractor or advertisement you should deduct @ 1% on payment or credit which ever is earlier. Payment/deposit of TDS should be quarterly wise. so, in your case has clearly cited Rs. 85,000/- amount of transaction happened during the year. so, you crossed the limit of Rs. 75,000/- and Rs. 25,000/- of 1st payment is above Rs. 20,000/- so, you have to deduct TDS for all the payments.
one thing you have to know. which is, There is no TDS rates has been changed during the year. so, you don't look on that. but, you have to see the calculation of interest, ie. 1% to be calculate upto 30-06-10 and there after 1.50%. Interest should be calculate from the date of payment / credit whichever is earlier and the interest amount should be rounded of to nearest multiple of Rs. 100/- as per sec 201(a1).
So, I thought you may come to the better end.