RELATED PARTY PAYMENTS

 its 20% or more voting power in d company of firm

Substantial Interest has been defined u/s 13 of Income tax act.

An individual is deemed to have a substantial interst if he individually or along with his relatives beneficially holds equity shares carrying not less 20% of the voting power in the case of company or is entitled to not less than 20% of the profits , in the concern, other than a company, at any time during the previuos year

For this purpose realtive means husband, wife, brother, sisiter or any lineal ascendant or descendant of that individual.

hope its clear now