BTST Trading
Buy Today, Sell Tomorrow — popularly called BTST — is a short-term trading strategy where you buy shares one day and sell them the very next day, before the shares actually reach your demat account. BTST sits in a grey zone between intraday and pure delivery: you take an overnight risk but skip the formal settlement.
Key takeaways:
- BTST means buying shares one day and selling them on the next trading day, before T+1 settlement.
- It lets you take advantage of overnight news without paying full delivery STT on the sell side.
- It carries a unique risk called short-delivery — if the original seller defaults, you face an auction penalty.
- No leverage is given; you pay the full price on T-day but settle on T+1.
- Best suited for short-term momentum trades around results, news or breakouts.
What is BTST trading?
The Indian market follows a T+1 settlement cycle. When you buy shares today (T), they are credited to your demat account on the next working day (T+1). BTST is the practice of selling those shares before they actually arrive in demat — that is, on T+1 morning, even though settlement is still in progress.
Most brokers allow this because the buy trade is locked in at the exchange. The sell is matched against the incoming delivery. If everything goes smoothly, the two settle off against each other and you net the price difference.
Why traders use BTST
- News and earnings reactions: Buy after good results late in the session, sell next morning when the wider market catches up.
- Avoid intraday cut-off: Intraday auto square-off limits the window. BTST extends that window to the next session.
- Lower STT than delivery: Selling within T+1 still attracts the full delivery STT, but you save on holding costs and capital lock-up.
How a BTST trade plays out
- Monday 2:50 p.m.: You buy 50 shares of ICICI Bank at ₹1,200 under CNC.
- Monday 6:00 p.m.: ICICI announces strong quarterly results.
- Tuesday 9:30 a.m.: Stock opens at ₹1,240. You sell 50 shares.
- Tuesday end-of-day: Settlement netting takes place; you receive ₹2,000 profit minus charges in your trading account on T+1 of the sell trade.
Short delivery risk explained
The biggest pitfall of BTST is short delivery. Your incoming buy might fail to settle on T+1 if the original seller defaults — for instance, if a stock is illiquid and the seller could not arrange shares. If that happens after you have already sold, the exchange runs an auction to source those shares. Auction prices can be up to 20% above the closing price, and that loss falls on you.
Short-delivery risk is small in highly liquid large-caps but real in mid-cap and small-cap scrips.
BTST vs intraday vs delivery
| Intraday | BTST | Delivery | |
|---|---|---|---|
| Holding | Same day | 1 day | Any |
| Leverage | Yes | None | None |
| STT (sell) | 0.025% | 0.10% | 0.10% |
| Demat credit needed? | No | No (sold pre-credit) | Yes |
Tips before you try BTST
- Stick to liquid large-caps to minimise short-delivery risk.
- Use limit orders, especially on the sell leg — gap openings can be brutal.
- Keep a stop loss; overnight news cuts both ways.
- Watch margin: brokers may block additional margin on a BTST sell to cover auction risk.
Frequently asked questions
Is BTST legal in India?
Yes. BTST is allowed; brokers simply add a warning about short-delivery risk before letting you sell pre-credit shares.
Does BTST attract intraday STT?
No. Since the buy was a delivery trade, the sell attracts full delivery STT of 0.10% on turnover.
Can I do BTST in F&O?
F&O has its own short-side equivalent called STBT, with different risk dynamics. BTST as defined here applies to cash equity.
What if there is a market holiday between buy and sell?
Settlement extends by one working day. You can still sell before delivery, but the gap and short-delivery risk window widen.
