Sir,
1) For Original Works you can avail 60 percent abatement. Service tax shall be paid on balance 40 percent i.e. 4.944 percent (40 percent of 12.36 percent ). Service Tax Category :- Works Contract Service.
2) For Repairs & Maintainence, you shall avail abatement of 30 percent incase providing maintainene service alongwith material and pay tax on balance 70 percent i.e 8.652 percent (70 percent of 12.36 percent)
3) Reverse charge mechanism shall apply if Service provider is Individual, HUF, AOP or Partnership firm and receiver is Body Corporate. i.e. 50 percent each provider & receiver.
4) For Pure MMRS, service tax shall be charged at full rate i.e. 12.36 percent where there is no element of material involved.
Kindly refer, Rule 2A - Service Tax (Determination of Value) Rules, 2006.
Thanks.