Formula to find brokerage and other charges

@rakeshr @sujith @Vivek @MAG
Yeah that would be really helpful ... if either the back end code/pseudocode or at least exact calculation method of brokerage calculator can be shared in the forum

Or if someone has made his/her own calculator with close enough results can share the code (if they are comfortable with it ) or atleast the pseudocode / calculation method

There are following doubts in making the calculator...

1. Brokerage(0.03%) is applied only while opening a position or both ( enter price and exit price separately)

STT is applied on the sell side as per the charges page
2. Is it applied only while opening a short position or also while closing a long position
3. Should the STT charge(0.025%) be applied to the price while being sold ( enter /exit depends 2.) or also to the price of inverse action(buy) of the trade.


4.Transaction charges are applied only while opening a position(0.00345 while entering a new position) or also while closing the position ( 0.00345% per order ,enter and exit )

5.SEBI charge is given 10 R/cr how is it appplied for order below 1 cr ? 10 /1cr *price of transaction(s) ? or 0 ? r some other method ?

Stamp charges are applied to Buy side as per the charges page
6. . Is it applied only while opening a long position or also while closing a short position
7 should the stamp duty charge to price. while being buying ( enter /exit depends 6.) or also on the inverse action( sell ) of the trade


would be great if the calculator function can be added to the api .. but i saw in some thread that it not very likely
in near future ( sorry for the long post had LOT of doubts )
thanx in advance

If someone is still looking for brokerage calculation logic, here is my version.


import { TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION } from "../constants";

export abstract class TransactionCostsUtils {
public static calculateTotalTransactionCosts(transactionType: string, buyPrice: number, sellPrice: number, quantity: number): any {
let totalTransactionCosts = 0;
switch (transactionType) {
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.DIRECT_EQUITY_INTRADAY: {
const turnover = (buyPrice + sellPrice) * quantity;
const brokerage = Math.min((buyPrice * quantity * 0.0003) + (sellPrice * quantity * 0.0003), 40);
const stt = Math.round((sellPrice * quantity) * 0.00025);
const exchangeTransactionCharge = turnover * 0.0000345;
const sebiCharges = turnover * 0.000001;
const stampDuty = Math.round((buyPrice * quantity) * 0.00003);
const gst = 0.18 * (brokerage + exchangeTransactionCharge + sebiCharges);
totalTransactionCosts = brokerage + stt + exchangeTransactionCharge + sebiCharges + stampDuty +gst;
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.DIRECT_EQUITY_DELIVERY: {
const turnover = (buyPrice + sellPrice) * quantity;
const stt = Math.round(turnover * 0.001);
const exchangeTransactionCharge = turnover * 0.0000345;
const sebiCharges = turnover * 0.000001;
const stampDuty = Math.round((buyPrice * quantity) * 0.00015);
const dpCharges = sellPrice > 0 ? 15.93 : 0;
const gst = 0.18 * (exchangeTransactionCharge + sebiCharges);
totalTransactionCosts = stt + exchangeTransactionCharge + sebiCharges + stampDuty +gst + dpCharges;
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.DIRECT_EQUITY_FUTURES: {
const turnover = (buyPrice + sellPrice) * quantity;
const brokerage = Math.min((buyPrice * quantity * 0.0003) + (sellPrice * quantity * 0.0003), 40);
const stt = Math.round((sellPrice * quantity) * 0.000125);
const exchangeTransactionCharge = turnover * 0.00002;
const sebiCharges = turnover * 0.000001;
const stampDuty = Math.round((buyPrice * quantity) * 0.00002);
const gst = 0.18 * (brokerage + exchangeTransactionCharge + sebiCharges);
totalTransactionCosts = brokerage + stt + exchangeTransactionCharge + sebiCharges + stampDuty +gst;
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.DIRECT_EQUITY_OPTIONS: {
const turnover = (buyPrice + sellPrice) * quantity;
const brokerage = 40;
const stt = Math.round((sellPrice * quantity) * 0.000625);
const exchangeTransactionCharge = turnover * 0.000053;
const sebiCharges = turnover * 0.000001;
const stampDuty = Math.round((buyPrice * quantity) * 0.00003);
const gst = 0.18 * (brokerage + exchangeTransactionCharge + sebiCharges);
totalTransactionCosts = brokerage + stt + exchangeTransactionCharge + sebiCharges + stampDuty +gst;
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.CURRENCY_FUTURES: {
const turnover = (buyPrice + sellPrice) * quantity * 1000;
const brokerage = Math.min((buyPrice * quantity * 1000 * 0.0003) + (sellPrice * quantity * 1000 * 0.0003), 40);
const exchangeTransactionCharge = turnover * 0.0000009;
const sebiCharges = turnover * 0.000001;
const stampDuty = Math.round((buyPrice * quantity * 1000) * 0.000001);
const gst = 0.18 * (brokerage + exchangeTransactionCharge + sebiCharges);
totalTransactionCosts = brokerage + exchangeTransactionCharge + sebiCharges + stampDuty +gst;
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.CURRENCY_OPTIONS: {
const turnover = (buyPrice + sellPrice) * quantity * 1000;
const brokerage = Math.min((buyPrice * quantity * 1000 * 0.0003) + (sellPrice * quantity * 1000 * 0.0003), 40);
const exchangeTransactionCharge = turnover * 0.000035;
const sebiCharges = turnover * 0.000001;
const stampDuty = Math.round((buyPrice * quantity * 1000) * 0.000001);
const gst = 0.18 * (brokerage + exchangeTransactionCharge + sebiCharges);
totalTransactionCosts = brokerage + exchangeTransactionCharge + sebiCharges + stampDuty +gst;
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.COMMODITIES_FUTURES: {
throw new Error('Calculation logic not yet implemented for this transaction type!');
break;
}
case TRANSACTION_TYPE_FOR_TRANSACTION_COSTS_CALCULATION.COMMODITIES_OPTIONS: {
throw new Error('Calculation logic not yet implemented for this transaction type!');
break;
}
default:
throw new Error('Can not calculate transaction costs for unknown transaction type!');
}
return totalTransactionCosts;
}
}