Interest rate on capital of partners

There is no minimum rate. You can pay interest at 0%. However, anything pertaining to payment of interest on capital to partners should be mentioned in the Partnership Agreement.

There is no minimum rate of interest on capital in case of partnership firm. but maximum rate of interest is 12%

No minimum and no maximum whatever u want u can pay to partner but it must be authorised by deed.

As per section 40b of income tax act firm will get deduction max of 12 % and partner will disclose as their business income.

Thanks Subhash ji