Email from Rajan, 25, Bangalore (2 years ago)
“Sir, I started Nifty options trading last month. I thought Weekly expiry is risky because it moves fast. So I bought Nifty Monthly 18300CE with 25 days left. Paid Rs 150. Nifty went from 18,100 to 18,350 in 10 days. 250 points up, but my call is now Rs 40. I lost Rs 11,000. What happened? Everyone said buy monthly options because they have time.”
Answer: Dear Rajan, you bought time – and time killed your monthly option. You bought the wrong expiry for the wrong reason.
A big lie sold to Nifty beginners: “Monthly options are safer because you have more time.”
Reality: Monthly options are where retail trading accounts go to die slowly, instead of quickly. If you’re a Nifty option buyer, you should touch Monthlies only 2 days per month. The other 28 days, Weekly is your only weapon. Let me prove it with blood and math.
Part 1: The Theta Difference — Why Monthlies Bleed You Slowly
Theta = Time Decay per day. This is what kills all buyers. But it kills Weekly and Monthly very differently.
Example: Nifty = 18,200. Buy 18200CE ATM. Expiry Days Left Premium Theta/Day Days to Lose 50% 0DTE Weekly 0 ₹65 -₹45 1.4 days 7DTE Weekly 7 ₹180 -₹18 5 days 25DTE Monthly 25 ₹320 -₹7 23 days Look at that. Monthly theta is “only” ₹7/day. Sounds safe.
DTE = Days to Expiry.
Here’s the trap: Nifty needs to move 7 points per day just for your Monthly to stay flat. If Nifty goes sideways for 10 days — which happens 60% of the time — you lose ₹70 = 22% of premium doing nothing.
Weekly 7DTE needs 18 points/day to stay flat. Higher bar, but if Nifty moves 100 points in 2 days, you make 80% while Monthly makes 15%.
CROCODILE Rule: We are Nifty option buyers. Buyers need movement, not time. We pay theta only when we expect explosive move in 48 hours. If we don’t expect a big move, we don’t buy. Monthlies tempt you to “hold and hope” for 25 days. Hope is not a strategy. Hope is a tax.
Rule #1: If you don’t have a specific catalyst in next 3 days — RBI, Budget, 5-red-day setup — do NOT buy Monthly. You’ll bleed ₹7/day and call it “safe.”
Part 2: Vega Risk — Why Monthly Options Get Killed by VIX Crush
Vega = How much option price changes when India VIX moves 1 point.
Same 18200CE ATM, Nifty 18,200: Expiry Premium Vega If VIX Drops 5 Points, You Lose 0DTE Weekly ₹65 2 -₹10 = -15% 7DTE Weekly ₹180 8 -₹40 = -22% 25DTE Monthly ₹320 22 -₹110 = -34% Monthly options are VIX bombs. Before RBI/Budget, VIX goes to 22. You buy Monthly at ₹320. Post-event, VIX crashes to 14. You lose ₹176 to VIX alone = 55% of premium.
Nifty can go up 200 points and you still lose money because ₹176 VIX loss > ₹150 intrinsic gain.
Weekly 0DTE has Vega 2. VIX crush hurts, but doesn’t kill. You live or die by Nifty direction, not VIX mood.
Rule #2: Never buy Monthly options 3 days before RBI, Budget, or US Fed. VIX will crush you even if you’re right. Buy Weekly 0DTE on event day, or buy Monthly after VIX crushes.
Part 3: Liquidity & Spreads — Why You Can’t Escape Monthly Losers
11:00 AM, Normal Day. Nifty 18,200: Strike 18200CE Bid Ask Spread Volume Weekly 0DTE ₹63 ₹65 ₹2 = 3% 8 lakh contracts Monthly 25DTE ₹312 ₹320 ₹8 = 2.5% 40,000 contracts Spread % looks similar. But look at Volume. Weekly trades 20X more.
Try to exit 10 lots Monthly when you’re down 30%: You hit market sell. You get ₹300 instead of ₹312 bid. Slippage = ₹12 x 500 = ₹6,000 lost on exit.
Weekly: You get ₹62.50. Slippage = ₹0.50 x 500 = ₹250 lost.
Monthly options are illiquid hotels. Easy to check in. Impossible to check out without paying exit tax. Retail gets trapped for 25 days, bleeding theta, hoping for miracle.
Rule #3: If OI <1 lakh and Volume <50,000, you don’t own an option. You own a cage. Most Monthly options fail this test 20 days/month. All Weekly options (upto 500 points from Nifty current level) pass this test every day.
Part 4: The Only 2 Days Retail Should Touch Monthly Options
We’re not saying “never buy Monthly options.” We’re saying “buy Monthly only on these 2 days.” CROCODILE uses this rule:
Day 1: The Day After VIX Crush
Event: RBI keeps rates flat. VIX 24 → 15 in 1 day. All Monthly premiums get slaughtered 30–40%.
Action: Next morning, buy Monthly ATM 30DTE. You’re buying after insurance got cheap. Vega helps you now.
Example: Post-Budget, VIX 26→16. Buy next month 18200CE at ₹190 instead of ₹310 pre-event. If Nifty rallies 400 points over 3 weeks, you make 3X.
Day 2: 5 Red Days + Monthly Expiry in 3–5 Days
Setup: Nifty fell 5 straight days. Monthly expiry next Thursday. Everyone is scared. Monthly puts expensive, calls cheap.
Action: Buy Monthly call 3–5 DTE. You get Weekly speed + Monthly cushion. This is CROCODILE’s favorite.
Example: Nifty 17,800 after 5 red. Buy Monthly 18100CE 4DTE at ₹60. If bounce to 18,300, you make ₹200. If no bounce, you lose ₹30 (with 50% stop loss rule). but you had 4 days, not 4 hours.
All other Days: Trade Weekly Options, 0DTE to 7DTE only. Or don’t trade. Monthlies will seduce you with “more time.”
More time = more theta + more VIX risk + more hope.
Author’s Note: The CROCODILE Expiry Rule
CROCODILE trades <5DTE Weekly options 95% of the time. Monthly only 5% of the time.
Why? Three reasons:
- We Hunt Speed, Not Time: We need 1% move within 48 hours. We need option to go from OTM to ITM. Monthly options are expensive and don’t respond quickly to Nifty moves.
- We Respect Theta: We pay ₹20–₹60 premium max per option. Monthly asks ₹100–₹300. That’s 4X more capital for 4X more theta. Bad risk-reward.
- We Exit within 48 Hours in Most Cases: Crocodile trade selection is based on high probabilith setups in the Nifty index. Monthly options tempt you to keep holding including over the weekends. Gamma risk kills option prices. The Crocodile hits profit target or stop loss within 48 hours in most cases. Weekly options allows that. Monthly punishes it.
If Nifty = 25,000, the CROCODILE will buy Weekly option 25,250CE with 3-5 days for expiry, not Monthly 25,500CE. We want the crocodile to strike fast and eat, not sunbathe for 28 days while theta eats us.
If you’re new to Nifty options, delete Monthly from your watchlist. Master Weekly first. If you can’t profit with Weekly options for 3 consective months, you should not touch Monthly options.
Your New Expiry Checklist — Print This
Before you buy ANY Nifty option, ask:
- How many DTE (Days to Expiry) ? If >7 and no catalyst in 48 hours, delete order.
- What’s VIX? If VIX >20 and DTE >7, you’re buying VIX crush. Delete order.
- What’s Volume? If <50,000 contracts, spread will kill you. Delete order.
- Why this expiry? If answer is “because I have more time,” delete order. Time is not your friend.
- Can I exit by 3 PM today? If Monthly and answer is no, you’re investing, not trading. Delete order.
If you break Rule #1, you will bleed slowly for 25 days instead of dying fast in 1 day. Slow death costs more.
Want to See Which Expiry Professionals Actually Trade?
CROCODILE-NIFTY trades Nifty Weekly <5DTE, 0–3 times per month. Monthly only after VIX crush + 5 red days.
Every trade has AMXSYS Notes: “Buy Weekly 0DTE 18200CE at ₹52. DTE: 0. VIX: 17. Exit by 2:45 PM. Monthly too expensive, theta too high.”
We show DTE, VIX, Volume, and why. 80% go to zero. 20% hunt 10X. All published.
₹4,900 per month, inclusive of GST. 30-day money-back guarantee.
Because CROCODILE only strikes 0–3 times/month, you get a full month to see Weekly-only discipline live.
Founder’s Price for first 200 traders. Then ₹7,999/mo. Real value $500/mo like our GIFT Nifty Futures system. We subsidize to teach India how to stop dying slowly in Monthlies.
If you’re done bleeding ₹7/day for 25 days on “safe” Monthly options, learn the system that hunts with Weeklies and lives.
Join CROCODILE-NIFTY → NiftyOptionsTrading.in/crocodile
Risk Disclosure: Options buying involves substantial risk. Weekly options decay faster. Monthly options have higher vega risk. Most retail buyers lose money. Past performance does not guarantee future results. Read full disclaimer.