What is Buying Power?
Buying power is funds available to open new positions after margin holds on existing trades.
Formula
Overnight Buying Power = Account Equity × 2 (Reg T, 50% initial margin) Intraday Buying Power = Account Equity × 4 (PDT accounts, FINRA Rule 4210)
Indian market context (NSE)
Reference levels: Nifty 50 at 24,300, Reliance Industries at ₹1,300, Bank Nifty futures at 55,000 (lot size 30). Examples below show how Buying Power shows up on Indian index, equity, and futures books — update to live quotes in your journal.
Nifty 50 perspective
Buying Power on NSE cash and Nifty (24,300): co-movement with global futures (SGX/GIFT) affects open print — log pre-market cue in journal.
Bank Nifty futures perspective
Buying Power visible in Bank Nifty depth at 55,000: banking basket drives ~40% of index move; watch HDFC/ICICI/Kotak contribution when interpreting buying power.
How to validate
- Validate Buying Power readings by session tag — open hour stats differ from midday.
- Check behaviour on gap-up/gap-down days separately on Nifty tags.
- Correlate with India VIX buckets (calm vs elevated) before changing rules.
- Confirm liquidity notes were filled on fast-market days.
How to track in TradeLyser
- Tag session phase and liquidity state on each trade influenced by Buying Power.
- Daily journal: one line on market structure context (gap, range, trend).
- Filter analytics by session tag during monthly review.
- Note India VIX at session open when structure rules depend on volatility.
Best practices
- Pre-define how Buying Power maps to session tags each quarter.
- Reduce size on expiry and event sessions when structure breaks.
- Journal gap days explicitly — averages hide gap risk.
- Align structure tags with India cash session hours (9:15–15:30).
Common pitfalls
- Applying midday rules to the opening 15 minutes without adjustment.
- Trading illiquid names with the same Buying Power assumptions as Nifty.
- Forgetting overnight gap risk on “intraday” tags.
- Over-tagging — so many structure labels that review becomes noise.
How to use this in TradeLyser
Log buying power % used at entry on leveraged tags; cap utilization in plan.
Related terms
Leverage means controlling larger notional than cash posted. F&O margin is a form of leverage with gap and margin-call risk.
Margin is the deposit brokers require to hold leveraged positions. It can rise sharply into expiry or on gap moves against you.
Portfolio heat sums risk at stop (or max loss) across open trades, often as % equity.
Position sizing translates account risk into quantity. With a ₹2,000 risk cap and ₹40 stop per share, size is 50 shares — before lot multiples on F&O.
FAQ
Buying power on cash account?
Mostly full cash — F&O differs.
Power drops intraday?
MTM losses reduce — monitor on volatile days.
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