Increment depends on your company policies. Usually there are Annual or Semi-annual increments. As mentioned, increments depends on the results of the PMS. Usually it is a percentage which is calculated on the basis of various parameters which indicated your performance. Usually a slab made for the different parameters in the the performance/productivity variability. say for instance for a person who's productivity was 60% compared to the set KPAs, his increment would be 8%, now someone with 90% gets 12%, another with 100% gets 15%. At times you would have certain employees scoring above 100%, for these employees, a special increment is set which is added to the 15% increment, being 15% the slab for 100% efficiency. usually another 10% max increment is added to the incremented value....... This is the usual trend, again it depends from one company to the other my friend.

Thanks,
Kevin