The idea

You want to buy a stock but only at a discount. Two ways to wait:

  1. Set a buy limit order at your target → you buy nothing and earn nothing while waiting
  2. Sell a cash-secured put at your target → get paid ₹X today; if the stock hits your price you’re forced to buy it; if not, you keep the premium

Option 2 pays you to be patient. That’s the cash-secured put.

Cash-secured put — hover to see P&L at any TCS priceProfitLoss
SPOT3,6503,2803,4783,6753,8734,070-403-283-163-4378
At Spot (3,700)
+₹22
Strikes
3,650

Above the short strike, you keep the full premium. Below, your P&L behaves like owning the stock at (strike − premium) — the discount you get from being paid to wait.

What would this have done on real Nifty?

Why “cash-secured”?

You must have enough cash in your account to actually buy the underlying if assigned. If you sell a TCS 3,700 put on 1 lot (175 shares), you need ₹3,700 × 175 = ₹6,47,500 in cash as collateral.

Naked put = selling the put WITHOUT cash reserved. Much riskier (margin call risk). Not what we’re teaching here.

A detailed worked example

Example

TCS cash-secured put — complete numbers

TCS at ₹3,800. You’d love to own it at ₹3,700.

Setup:

  • Sell 1 TCS 3,700 PUT (monthly, 30 days out) at ₹50 premium
  • Cash reserved as collateral: 3,700 × 175 = ₹6,47,500
  • Premium collected today: 50 × 175 = ₹8,750
TCS 3,700 short put — hover to see P&L at any expiry priceProfitLoss
SPOT3,7003,3203,5353,7503,9654,180-68k-46k-25k-3k19k
At Spot (3,800)
+₹8,750
Strikes
3,700

Above ₹3,700: keep the full ₹8,750 (flat green line). Below ₹3,700: assigned into stock; your effective cost becomes ₹3,650/share. Losses grow linearly with TCS falling.

Return calculations:

Formula

Return if unchanged/OTM = Premium collected ÷ Collateral = 8,750 ÷ 6,47,500 = 1.35% for the month (~17% annualized if repeatable)

Effective purchase price if assigned = Strike − (Premium ÷ Lot size) = 3,700 − 50 = ₹3,650 per share

Break-even below assignment = Effective purchase price = ₹3,650

Assignment probability at 2.6% OTM strike ≈ 25-35% typically

Selecting the right strike

Just like covered calls, the strike choice reflects your view.

Strike vs spotPremiumAssignment probabilityBest when
ATM (at spot)Highest~50%You want the stock now; maximize premium
1-2% OTMHigh~35-45%Aggressive — want the stock soon, big premium
3-5% OTM ← common sweet spotModerate~20-30%Patient — happy at meaningful discount
5-8% OTMLower~10-20%Very patient — want stock only on real dip
10%+ OTMVery low~5% or lessPure income, rarely assigned
Advanced An expert cash-secured put ranking system

Same idea as covered call ranking, applied to puts.

Step 1: Compute two returns

Formula

Return-if-unchanged (RIU) = Premium ÷ (Strike × Lot size)

Return-if-assigned (RIA) = What you effectively “made” if assigned at expiry = Premium ÷ (Strike − Premium/Lot × Lot size) ≈ Premium ÷ Effective purchase cost

Note: RIA is a bit conceptually weird — you don’t literally “profit” at assignment; you’re now long stock. It represents the “yield” you got in exchange for the assignment discount.

Step 2: Rank candidates

Three TCS put candidates (TCS at 3,800):

StrikeOTM%PremiumRIU (mo)Assignment Prob
3,750 (1.3% OTM)1.3%₹851.30%~40%
3,700 (2.6% OTM)2.6%₹500.77%~30%
3,650 (3.9% OTM)3.9%₹350.55%~20%
3,600 (5.3% OTM)5.3%₹220.34%~12%

An expert principle:

  • If you WANT the stock: pick higher assignment probability (3,750 strike) — you get paid to buy it soon
  • If you’re INDIFFERENT / mostly want income: pick lower assignment probability (3,600 strike) — smaller premium, more likely to keep repeating

The 3,700 strike (middle) is the balanced pick most retail traders converge on.

Step 3: Apply the “would I own this stock?” filter

Before selling ANY cash-secured put, ask:

  • Would I hold this stock for 6-12 months if assigned?
  • Is my collateral fully committed to this position (no need elsewhere)?
  • Is the strike price genuinely attractive as an entry price?

If any answer is no, don’t sell the put. Selling puts on stocks you don’t want is a recipe for getting stuck holding losers.

The put ladder — spreading across strikes

Instead of one put at one strike, layer multiple puts at different strikes for a smoother entry curve.

Example

TCS put ladder — three strikes

TCS at ₹3,800. You want to accumulate a full position if it drops.

Sell three puts:

  • 1 × TCS 3,700 PUT @ ₹50 → collateral 6,47,500, premium ₹8,750
  • 1 × TCS 3,650 PUT @ ₹35 → collateral 6,38,750, premium ₹6,125
  • 1 × TCS 3,600 PUT @ ₹22 → collateral 6,30,000, premium ₹3,850

Total capital committed: ₹19,16,250 (need this in cash) Total premium collected: (50 + 35 + 22) × 175 = ₹18,725/month

Yield on total collateral: 18,725 / 19,16,250 = 0.98%/month (~12% annualized)

Outcomes based on TCS at expiry:

  • Above 3,700: all worthless → keep ₹18,725. Sell three new puts next month.
  • Between 3,650-3,700: 3,700 put assigned → own 175 shares at effective ₹3,650. Keep ₹9,975 premium.
  • Between 3,600-3,650: 3,700 + 3,650 assigned → own 350 shares averaged at ~₹3,635. Keep ₹14,875 premium.
  • Below 3,600: all three assigned → own 525 shares averaged at ~₹3,614. Full premium.

You’ve legged into a full position at progressively better prices without chasing the drop.

The Wheel — the retail canonical income strategy

Combining CSP + covered call in a rotation:

  1. Start with cash. Sell cash-secured puts on stocks you want to own.
  2. If not assigned → collect premium, repeat next month
  3. If assigned → now hold shares → switch to covered calls (Chapter 7)
  4. If not called away → collect call premium, repeat
  5. If called away → back to cash. Restart at step 1.

Round and round. Small consistent income. Ideal for accumulating quality stocks.

Advanced The Wheel — detailed playbook

Setup requirements

  • Capital: ₹5-10 lakhs minimum (need collateral for at least 1 lot)
  • Watchlist: 3-5 stocks you’d genuinely own long-term
  • Time: 15-30 min per month to review and roll

Stock selection criteria

Best candidates for the Wheel:

  • Large-cap — liquid options, tight spreads
  • Dividend-paying — extra yield on top
  • Moderate volatility (15-25% annualized) — enough premium
  • Range-bound or slow trend — assignment less catastrophic
  • You’d hold long-term — assignment is fine, not a disaster

Indian best-of-breed:

  • Reliance (lot 250) — most liquid
  • TCS (lot 175) — tight spreads
  • HDFC Bank (lot 550) — banking beta
  • Infosys (lot 400) — IT sector
  • ITC (lot 1600) — dividend heavy
  • L&T (lot 175) — capital goods

The monthly rhythm

Day 1 (day after expiry):

  • Review watchlist
  • Sell puts on 1-3 stocks at 3-5% OTM, monthly cycle
  • Pick strikes you’d genuinely be happy to buy at

Weeks 2-3:

  • Monitor but don’t overtrade
  • If a put goes deep ITM and you don’t want assignment: roll down and out for credit

Day 21-22:

  • If put is very cheap (< 25% of premium collected): buy back, redeploy
  • If put is threatening but you’re OK with assignment: hold to expiry

Expiry day:

  • OTM puts expire worthless → collect premium → restart
  • ITM puts assigned → prepare for shares
  • The next Monday: if assigned, sell covered calls on the new shares

Assigned — now what?

You now own 175 shares of TCS at ₹3,650 effective. TCS is at ₹3,620.

Options:

  1. Sell covered call at 3,700-3,750 strike, next month. Continue Wheel cycle.
  2. Hold and wait for TCS to recover before writing calls (if premium is too low right now).
  3. Sell if the thesis broke — cash out, redeploy elsewhere.

Realistic Wheel returns

Market regimeAnnualized returnNotes
Bull (Nifty up 15-25%/yr)10-15%Underperform market — you get called away early
Range-bound / slow trend12-18%Sweet spot — collect premium repeatedly
Mild correction (−5 to −15%)3-8%Absorb the drop via lower cost basis
Sharp bear market (−20%+)−10 to −20%Underperform less than raw stock hold

Long-run average across cycles: ~10-15% CAGR on the working capital. Not a get-rich strategy but a reliable one for patient investors.

When the Wheel breaks

If a stock drops 30-40% while you’re wheeling it:

  • You’re stuck with shares deeply underwater
  • Covered call premium is meager (deep OTM strikes)
  • Original thesis may be broken

Rule: if a wheeled stock drops 25%+ from your first assignment price, exit the position entirely and redeploy capital. Don’t keep writing worthless calls hoping for recovery.

Common Wheel mistakes

  1. Wheeling stocks you wouldn’t hold — get stuck with junk
  2. Too much concentration — Wheel on 1 stock = single-name risk
  3. Chasing high-premium strikes — assignment happens faster than expected
  4. Ignoring earnings — assignment on earnings drops is common
  5. Rolling puts for debit — never do this

Follow-up action for cash-secured puts

Advanced Adjustment recipes for cash-secured puts

Scenario 1: Put is going ITM, don’t want assignment

Symptom: Stock has dropped through your strike; put is now ITM by 1-3%.

Action A — Roll down and out for credit.

  • Buy back current put at loss
  • Sell a further-OTM put with more time (next month)
  • Must be net credit
  • Strike is lower (accept if assigned) and time is longer

Action B — Accept assignment.

  • If you’d own the stock at this price anyway, let assignment happen
  • Start writing covered calls next Monday
  • This IS the Wheel working

Action C — Buy back and close, do nothing further.

  • Take the option loss
  • Wait; sell a fresh put next month at a different strike or don’t
  • Best when: your fundamental view on the stock has changed

Scenario 2: Put is near-worthless with time left

Symptom: 15 days left; put worth ₹5 vs. original ₹50; stock rallied away.

Action: Buy back for near-full profit.

  • Pay ₹875 to close (₹5 × 175)
  • Keep ₹7,875 realized
  • Redeploy capital in next month’s put at a fresh strike

The “close early” rule: when put value drops to under 25% of premium collected, close and redeploy. Time value is squeezing, gamma risk is rising, better opportunities await.

Scenario 3: Approaching expiry with put ATM

Symptom: 3 days left; stock at strike; put worth ~₹15.

Action A — Close for near-max profit.

  • Pay ₹15 to close (~30% of original ₹50)
  • Skip pin risk on expiry morning
  • Redeploy immediately

Action B — Hold to expiry.

  • Save closing cost
  • Accept pin risk (small if strike is round number)

For most retail traders, closing early is safer.

Scenario 4: Earnings during position life

Symptom: You sold a put; earnings are announced for 2 days from now.

Action A — Close before earnings.

  • Lock in current time decay
  • Avoid IV crush + gap risk
  • Redeploy after earnings

Action B — Hold through earnings.

  • If IV was already elevated at entry, IV crush helps
  • Directional risk is on you

Retail default: close before earnings on individual stocks. Only hold if the position is already deep OTM and safe.

When cash-secured puts fail

Not a golden goose. Fails in these situations:

The core skill isn’t the strategy — it’s stock selection. A good CSP on a bad stock is still a bad trade.

Indian market specifics

Physical delivery

If assigned, you receive actual shares in your demat. Delivery mechanics:

Weekly puts?

Corporate actions

Always check upcoming corporate actions before selling stock puts. Some brokers show them; NSE circulars are the primary source.

The put credit spread — defined-risk alternative

If you don’t want to tie up ₹6.5L in collateral, use a bull put spread:

Trade-off: less premium, bounded loss, much less capital tied up.

For traders with less capital, put credit spreads are strictly better risk-adjusted than cash-secured puts. See Chapters 10/11 for spreads in depth.

Full pre-trade checklist

Before selling any cash-secured put:

Summary

The cash-secured put is the “buy dips at your prices” strategy. Combined with covered calls (the Wheel), it’s the workhorse retail income framework in India.