Seema
Your question is not very clear. But I would attempt to answer it.
TDS provisions are applicable to deductors being individuals etc. only if their annual turnover IN THE IMMEDIATELY PRECEDEDING FINANCIAL YEAR exceeds the limits prescribed u/s 44 AB of the IT Act, ie., to say Rs.40 Lakhs in case of non professionals and Rs.10 Lakhs in the case of professionals.
In the instant case you are referring to a situation where at the beginning of a year when receipts are less than Rs. 40 Lakhs. Pl be advised that income at the beginning/mid/end will not make any sense w.r.t TDS. Any income will be for a period/year.
Pl decide the instant case on the above lines. Should you to deduct tax, it is on entire payments and on payments after obtaining TAN. Broadly a TAN application is to be made within one month from the date of deducting/collecting tax. Pl refer to Rule 114A for details
Pl keep posted your comments/queries