You collected ₹1,875 credit on a NIFTY iron condor. Ten days later, the position is worth ₹940. You're up ₹935 — exactly 50% of max profit. Your broker app shows ₹935 green. Your friend says "hold for the full ₹1,875." Close the trade.
This playbook explains why — and the mathematical reason 50% is the magic number for credit spreads in Indian markets.
1. The 50% Rule Explained
The rule
Close short-premium trades (credit spreads, iron condors, strangles) when they reach 50% of max profit. For debit spreads, the equivalent target is 80% of max.
2. Why 50% — The Math
Consider a 30-day iron condor. Profit accumulates non-linearly:
Profit Accumulation CurveTypical 30-DTE iron condor
| Days elapsed | % of max profit | Gamma risk | Time to get here |
|---|
| 5 | 15% | Low | fast |
| 10 | 33% | Low-Med | fast |
| 14 | ~50% | Medium | halfway |
| 21 | 65% | HIGH | most time |
| 25 | 75% | VERY HIGH | most time |
| 30 (expiry) | 100% | EXTREME | total |
First 50% of profit takes ~47% of time with LOW gamma. Last 50% takes 53% of time with HIGH gamma. Risk-adjusted return of the second half is much worse.
3. Live NIFTY Example
NIFTY 24,800 Iron Condor, 30 DTE
Opened at ₹75 credit, lot 25
Entry credit+₹1,875
Max profit (full credit)₹1,875
50% target (close at)~₹940 profit (position worth ₹935 to buy back)
Typical days to hit 50%10-14 days
Capital freed for next trade~₹60,000
Annualized if repeat 3 cycles/mo~35-45%
4. Implementation with GTT Orders
When you OPEN the trade, immediately place a GTT (Good Till Triggered) buy-to-close order at 50% of your entry credit. For ₹75 credit entered, set a GTT at ₹37.50. The order executes automatically — removes emotion, guarantees discipline.
Indian brokers: Zerodha Kite, Upstox Pro, ICICI Direct, and Fyers all support GTT on options. Set it once, forget it.
5. The 5 Exceptions to the Rule
Close EARLIER than 50% if:
- Major event incoming (earnings, RBI, budget) within remaining DTE
- IV rank dropped sharply — most theta already captured
- 21 DTE threshold hit — gamma zone begins
- Position Delta shifted ±20 points — market moved, thesis questioned
- You have a better opportunity for the capital
Set 50% GTT in Strategy Lab
Pre-filled buy-to-close orders at 50% profit target.
Open Strategy Lab →Frequently Asked Questions
What is the 50% profit rule?
The 50% profit rule states: close credit spreads when they reach 50% of maximum profit. For an iron condor collected at ₹1,875 credit, close when the position is worth ~₹938 less (i.e., showing ₹938 profit). The remaining 50% requires holding through the high-gamma final weeks — risk/reward ratio becomes unfavorable.
Why not hold for full profit?
Because the last 50% of profit takes 70-80% of the total time AND exposes you to 2-3× more gamma risk. Historical data: traders who close at 50% compound at higher annualized returns than hold-to-expiry traders because they (a) redeploy capital faster and (b) avoid catastrophic expiry week losses.
Does this apply to debit spreads too?
Yes, but with a different threshold. For debit spreads (bull call, bear put), target 80% of max profit. Debit spreads have less tail risk than credit spreads (defined max loss = debit paid), so holding longer is safer. Rule: Credit spreads 50%, debit spreads 80%.
When should I close sooner than 50%?
Close sooner if: (1) major event approaching (earnings, RBI, budget) that could move IV sharply, (2) 21 DTE threshold hit regardless of profit, (3) thesis breaking (trending market). The 50% rule is a MINIMUM target — closing earlier is acceptable, closing later is not.
What's the math behind 50%?
Research on 40+ years of options data shows that closing short premium trades at 50% max profit produces higher risk-adjusted returns than holding to expiry. The 50% threshold balances (1) theta captured (most happens early), (2) gamma risk avoided (concentrated at expiry), and (3) capital velocity (faster redeployment). It's an empirical sweet spot, not arbitrary.
How do I implement the rule?
Set a GTT (Good Till Triggered) order in your broker when you open the trade. Exit price = Entry credit × 0.5. Example: If you opened for ₹45 credit, set a buy-to-close order at ₹22.50. The order executes automatically when hit — removes emotion. Most Indian brokers (Zerodha, Upstox, ICICI Direct) support GTT for options.
Compound faster with disciplined exits
Free F&O portfolio tracker. See your open premium and 50% targets at a glance.
Start Free →