The maximum salary limit for eligibility for a bonus as per the Payment of Bonus Act is Rs 21,000 per month. This amount should be the same component that you consider for the calculation of the bonus. That is, if your salary has components like HRA, Conveyance, etc., which are not considered for bonus calculation, but only Basic and DA are considered, then for ineligibility for the bonus also, this Rs 21,000 should be Basic and DA components only.