What is Bid-Ask Spread? Why It Matters for Traders in India
The bid-ask spread is the difference between the highest price a buyer is willing to pay (bid) and the lowest price a seller is willing to accept (ask) for a stock at any given moment. It is an invisible cost of trading that most beginners overlook.
If you walk into a currency exchange shop, you will notice two rates: the buying rate and the selling rate. The shop buys dollars from you at Rs.82 and sells to you at Rs.84. That Rs.2 gap is their spread. The stock market works the same way. The bid is the buying rate. The ask is the selling rate. The spread is the gap between them.
How does bid-ask spread affect your trades?
If HDFC Bank has a bid of Rs.1,598 and an ask of Rs.1,600, the spread is Rs.2. If you buy at Rs.1,600 and immediately sell, you can only sell at Rs.1,598. You have lost Rs.2 per share just from the spread, before even considering brokerage and taxes.
For intraday traders making multiple trades a day, spreads add up quickly. A Rs.1 spread across 10 trades of 500 shares each is Rs.5,000 in hidden costs that do not appear in your brokerage statement but directly reduce your profits.
What determines the size of the spread?
| Factor | Effect on Spread |
|---|---|
| High liquidity (large-cap stocks) | Tight spread, typically Rs.0.05 to Rs.1 |
| Low liquidity (small/micro cap) | Wide spread, Rs.5 to Rs.50 or more |
| High volatility periods | Spread widens as sellers demand more premium |
| Market open and close | Spread often wider in first and last 15 minutes |
| Corporate events (results day) | Spread can widen sharply around announcements |
How can investors minimize the impact of spread?
Trade in liquid stocks where spreads are tight. Avoid placing market orders in illiquid stocks. Use limit orders to control the exact price you buy or sell at. If you are an intraday trader, factor spread into your profit calculations because it is a real cost even though it does not appear as a separate line item.
You can view bid-ask spreads in real time on Stockk at stockk.trade/products/equity.
Investments in securities market are subject to market risks. This article is for educational purposes only.
Frequently Asked Questions
I see a stock with a very wide spread. Does that mean something is wrong with the company?
Not necessarily. Wide spreads are common in stocks with low trading volume, regardless of the company's health. Many fundamentally strong mid-cap and small-cap companies have wider spreads simply because fewer traders are active in them. However, a suddenly widening spread in a previously liquid stock can indicate uncertainty or developing negative news.
Is bid-ask spread the same throughout the trading day?
No. Spreads are typically widest at market open when orders are still settling, and can also widen near market close. During the middle of the trading session, spreads tend to be narrower for liquid stocks. Major news events, earnings announcements, or RBI decisions can widen spreads temporarily even for large-cap stocks.
Do I pay the bid-ask spread on every trade?
Effectively, yes. Every time you buy at the ask and later sell at the bid, you pay the spread. It is built into the transaction. The only way to avoid it is to use limit orders and wait for the market to come to your price, but even then, when you eventually exit, you face the spread on the sell side.
Which Indian stocks have the tightest spreads?
The most liquid large-cap stocks in the NIFTY 50 and BankNIFTY index, such as Reliance, HDFC Bank, TCS, and Infosys, typically have the tightest spreads, often just Rs.0.05 to Rs.0.50. NIFTY 50 and BankNIFTY futures and options also have very tight spreads due to massive trading volumes.
How is bid-ask spread related to market makers?
Market makers are entities that continuously place both buy and sell orders in a stock, providing liquidity. They profit from the spread between their bid and ask. In the SME segment of BSE and NSE, market makers are mandatory to ensure minimum liquidity. In the main board, institutional traders and algorithmic systems often serve a similar function without being formally designated as market makers.
Investments in securities market are subject to market risks. This article is for educational purposes only and does not constitute investment advice.
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