Ratio Call
Write

What is a ratio call write?

A ratio call write is an income strategy where you hold the underlying — shares or a futures position — and sell more call options against it than you have cover for. A standard covered call sells one call per lot of stock; a ratio write sells two or more. The extra premium sweetens the income and lowers your effective breakeven, but the uncovered call introduces risk that a plain covered call never has.

The trade earns best when the underlying drifts sideways or eases gently toward the strike, letting all the sold calls expire worthless while you keep the stock and the premium. Push the price too high, though, and the uncovered call turns the strategy from comfortable income into an open-ended liability — the central tension every ratio writer must manage.

Key takeaways

• A ratio call write is a neutral-to-mildly-bearish income trade — you want the underlying flat or slightly easing.
• You sell more calls than your holding covers, so part of the position is uncovered.
• The extra premium boosts income and lowers breakeven versus a plain covered call.
• The uncovered call creates open-ended risk if the price rallies past the upper breakeven.
• It needs SPAN + exposure margin on the uncovered leg, on top of the shares used as collateral.

How it works

Say you hold one lot of the underlying and sell two calls at the same strike — a 1:2 ratio write. One call is covered by the stock; the second is naked. Below the strike, both calls expire worthless and you keep all the premium plus any rise in the shares up to the strike. At the strike your profit peaks. Above it, the covered call's loss is offset by your stock, but the extra call has nothing behind it, so each further point costs you and the loss climbs without limit.

Because of that uncovered call, the exchange blocks SPAN + exposure margin on top of using your shares as collateral, and that margin expands as the trade moves against you. Theta and a fall in implied volatility both work in your favour while the price sits below the strike. For NIFTY and Bank Nifty the option legs are cash-settled against a futures or synthetic holding; for single stocks, watch assignment and physical delivery near expiry.

The numbers that matter

Worked NIFTY example

Suppose NIFTY is near 22,500 and you hold one lot via futures, expecting it to stay flat or ease into expiry. You sell two 22,700 calls at ₹80 each. With a lot size of 75, you collect ₹80 × 2 × 75 = ₹12,000 in premium (illustrative figures):

• Peak profit sits at 22,700: the 200-point gain on the holding (₹15,000) plus ₹12,000 premium ≈ ₹27,000.
• Upper breakeven: the extra naked call erodes the peak above 22,700 — roughly 23,060 here.
• Above breakeven: loss grows ₹75 per point on the uncovered call, without limit.

NIFTY at expiry	Outcome	P&L (1 lot held)
22,300	Calls worthless, stock eases	+₹12,000
22,500 (entry)	Calls worthless, flat stock	+₹12,000
22,700 (strike)	Peak — stock gain + premium	+₹27,000
23,060 (breakeven)	Naked call eats the gains	₹0
23,500	Naked call runs against you	−₹33,000

The payoff is a tent that peaks at the strike, then turns down sharply because of the extra call. You earn rich income in a flat-to-soft market, but a strong rally first caps and then reverses the gain into an open-ended loss.

When to use a ratio call write

• You are neutral to mildly bearish and expect the underlying to stall or drift toward the strike.
• Implied volatility is elevated, so the calls you sell are richly priced and likely to decay.
• You already hold the underlying and want to squeeze extra yield from a sideways patch.
• You have a firm exit plan — a price level at which you will buy back the extra call or hedge it.

Risks to respect

• Open-ended upside risk: a gap-up on results or news can blow past the upper breakeven and keep going.
• Margin expansion: as the price rises, the exchange raises the margin on the uncovered call, forcing a top-up or square-off.
• Assignment: in-the-money calls can be assigned, leaving a delivery or cash obligation beyond your cover.
• Asymmetric payoff: you collect a modest income against the chance of a large, uncapped loss.

Ratio call write vs covered call

A covered call sells exactly one call per lot of stock, so the holding fully backs the obligation and the worst case is simply having your shares called away at the strike — capped, not open-ended. The ratio call write sells one or more extra calls for more premium and a lower breakeven, but those extras are naked. In short, the ratio write trades the covered call's safety for higher income and real tail risk.

Ratio call write vs call ratio spread

A call ratio spread reaches a similar lopsided payoff using only options — buy one call and sell two higher ones — rather than holding the underlying. Both leave an uncovered short call and open-ended upside risk, but the ratio spread needs no stock or futures position and is usually cheaper to carry. The ratio call write suits someone who already owns the underlying and wants to overlay extra income on it.

Common adjustments

The standard defence is to buy back the extra call if the price approaches the strike, converting the position back to a plain covered call. Traders also cap the tail by buying a further out-of-the-money call against the naked leg — turning that part into a bear call spread — or by rolling the short calls up and out to a higher strike and later expiry as the underlying climbs.

Frequently asked questions

Is a ratio call write bullish or bearish?

Neutral to mildly bearish. It earns most when the underlying drifts sideways or eases toward the strike, and it loses if the price rallies strongly past the upper breakeven.

How is it different from a covered call?

A covered call sells one call against the shares you own. A ratio call write sells two or more against the same shares, so one or more of those calls is uncovered and adds open-ended risk.

What is the maximum loss on a ratio call write?

Because of the extra uncovered call, the loss is theoretically unlimited if the underlying rallies sharply. The downside risk is the cost of the holding less the premium collected.

How much margin does it need?

The covered portion uses the shares as collateral, but the extra uncovered call attracts SPAN + exposure margin, which grows if the trade moves against you.

The bottom line

The ratio call write is a way to wring extra premium from a holding you expect to stall: stack more sold calls on top of your stock, pocket the income, and lower your breakeven. The reward for that is a payoff that peaks at the strike and then turns open-ended, so it belongs with experienced sellers who own the underlying, watch the uncovered leg closely, and have a clear plan to defend it before a rally gets away.

Related strategies & terms

• Covered Call — the safer, one-call-per-lot version with capped upside.
• Call Ratio Spread — a similar lopsided payoff built from options alone.
• Ratio Put Write — the put-side mirror that adds open-ended downside risk.
• Naked Option · Breakeven · SPAN Margin