Yes, Interest on delayed payment at the rate of 18% p.a will be charged on outstanding debit balance on all E-Margin positions.

The number of days for delayed payment charge would start from the Exchange pay-in date for the settlement of the respective buy transaction and charged till the date the funds are actually received (eg. till the date of Convert to delivery (CTD) or till the date of funds received/pay-out date after squaring off of positions). 

Interest on delayed payment on a per day basis would be displayed under History -> Funds Settlement -> Delayed PymtChgs link under your Trading section. 

For example:-

(a) E- Margin position from Funds only:

(i) E-Margin Position squared off on T+2

 
You bought 100 qty shares of “Scrip A” at Rs. 1000 under E Margin on Apr 18, 2016 with 20% Margin and sold full qty on Apr 20, 2016. i.e on T+2nd day ,  In this example Delayed payment charges on outstanding debit balance  would be calculated as follows:

Margin amount = (100*1000) * 20% = Rs 20000

Outstanding debit balance = (1000 * 100) - (100*1000) * 20% = Rs 80000

Buy transactions Exchange Pay-in Date = T+2 i.e. Apr 18, 2016 + 2 days =Apr 20, 2016

Sell Square off transactions Exchange Pay-out Date = T+2 i.e. Apr 20, 2016 + 2 days = Apr 22, 2016

No. of days delay in payment = Apr 20, 2016 to Apr 22, 2016 = 2 days delay

For the above case, Interest on delayed payment @ 1.5% per month or alternatively 18% p.a. would be calculated on the outstanding debit balance for 2 days delay as follows:

Interest on delayed payment per day = outstanding debit balance * Interest on delayed payment % per annum * 1/ 365 =80000* 18%*1/365 = Rs. 39.45/- per day or Rs.78.9 for 2 days. If there are trading holidays in between then the Interest on delayed payment will be charged for these days also.

(ii) E-Margin position squared off on T+9th day 

You bought 100 qty shares of  “Scrip A” at Rs. 1000 under E Margin on Apr 11 , 2016 with 20% Margin and sold full qty on Apr 22, 2016.i.e on T+9th day ,  In this example Delayed payment charges on outstanding debit balance  would be calculated as follows:

Margin amount = (100*1000) * 20% = Rs 20000

Outstanding debit balance = (1000 * 100) - (100*1000) * 20% = Rs 80000

Buy transactions Exchange Pay-in Date = T+2 i.e. Apr 11 , 2016 + 2 days =Apr 13 , 2016

Sell Square off transactions Exchange Pay-out Date = T+2 i.e. Apr 22, 2016 + 2 days = Apr 26, 2016 (assuming additional 2 settlement holidays/weekend)

No. of days delay in payment = Apr 13, 2016 to Apr 26, 2016 = 13 days delay

For the above case, Interest on delayed payment @ 1.5% per month or alternatively 18% p.a. would be calculated on the outstanding debit balance for 13 days delay as follows:

Interest on delayed payment per day = outstanding debit balance * Interest on delayed payment % per annum 1/ 365=80000* 18%*1/365= Rs.39.45 per day or Rs. 512.88 for 13 days.

(b) E-Margin position Convert to Delivery (CTD):

(i)   E-Margin CTD done on T+2nd day

You bought 100 qty shares of “Scrip A” at Rs. 1000 under E Margin on Apr 18, 2016 with 20% Margin and converted the full qty to “Delivery” on Apr 20th, 2016. i.e on T+2nd  day,  In this example Delayed payment charges on outstanding debit balance  would be calculated as follows:

Margin amount = (100*1000) * 20% = Rs 20000

Outstanding debit balance = (1000 * 100) - (100*1000) * 20% = Rs 80000

Buy transactions Exchange Pay-in Date = T+2 i.e. Apr 18, 2016   + 2 days =Apr 20, 2016

CTD done on 20th Apr 2016

No. of days delay in payment = Apr 20, 2016 to Apr 20, 2016 = 0 days delay

Thereby, no interest on delayed payment will be levied for the aforementioned transaction. 

(ii) E-Margin CTD done on T+5th day

You bought 100 qty shares of “Scrip A” at Rs. 1000 under E Margin on Apr 21, 2016 with 20% Margin and converted the full qty to “Delivery” on Apr 28, 2016. (i.e. on T+5th day-assuming additional 2 settlement holidays/weekend) ,  In this example Interest on delayed payment would be calculated as follows:

Margin amount = (100*1000) * 20% = Rs 20000

Outstanding debit balance = (1000 * 100) - (100*1000) * 20% = Rs 80000

Buy transactions Exchange Payin Date = T+2 i.e. Apr 21, 2016   + 2 days =Apr 25, 2016 (assuming additional 2 settlement holidays/weekend)

CTD done on 28th Apr 2016

No. of days delay in payment = Apr 25, 2016 to Apr 28, 2016 = 3 days delay

Thereby, for the above case say Interest on delayed payment charge @ 1.5% per month or alternatively 18% p.a. will be calculated on the outstanding debit balance for 3 days delay as follows:

Interest on delayed payment per day = outstanding debit balance * Interest on delayed payment % per annum * 1/ 365=80000*18%*1/365 = Rs. 39.45 /- per day or Rs.118.36 for 3 days.

 (c) E-Margin position from Collateral limits:

You bought 100 qty shares of “Scrip A” at Rs. 1000 under E Margin on Apr 21, 2016 with 20% Margin and sold full qty on Apr 27, 2016. i.e. on T+4th day ,  In this example Delayed payment charges on outstanding debit balance  would be calculated as follows:

Margin amount = (100*1000)*20% = Rs 20000, this margin is adjusted against existing collateral limits only, no bank pay-in for margin amount. 

Outstanding debit balance = (1000 * 100) = Rs 100000

Buy transactions Exchange Pay-in Date = T+2 i.e. Apr 21, 2016   + 2 days =Apr 25, 2016(assuming additional 2 settlement holidays/weekend)

Sell Square off transactions Exchange Pay-out Date = T+2 i.e. Apr 27, 2016 + 2 days = Apr 29, 2016

No. of days delay in payment = Apr 25, 2016 to Apr 29, 2016 = 4 days delay

Interest on delayed payment @ 1.5% per month or alternatively 18% p.a. would be calculated on the outstanding debit balance for 4 days delay as follows:

Interest on delayed payment per day = outstanding debit balance * Interest on delayed payment % per annum * 1/ 365 =100000*18%*1/365 = Rs. 49.32 - per day or Rs.197.26 for 4 days.