A variable ratio write (also called a ratio buy‑write) is an options income strategy in which you hold a long position in the underlying stock and simultaneously sell (write) multiple call options at different strike prices in a specified ratio to your long shares. The technique is designed to collect option premium and can be used when you expect low near‑term volatility in the underlying. Because you typically sell more call exposure than the number of shares you own, the strategy has limited upside and potentially unlimited upside risk on the short side (if the stock soars). It is an advanced strategy and not recommended for inexperienced traders.
Key features (at a glance)
– Structure: long underlying shares + multiple short calls at different strikes (ratio of calls per 100 shares owned).
– Goal: collect premium and earn income while stock stays in a defined range.
– Payoff shape: limited maximum profit (usually when stock finishes between the short strikes) and potentially large losses if the stock rises sharply beyond the upper breakeven.
– Best used: when you expect little movement in price and want premium income, and you understand assignment/margin risk.
How the “ratio” is expressed
– Ratios are normally expressed per 100 shares (one option contract = 100 shares). For example, a 2:1 ratio commonly means selling 2 call contracts for every 100 shares you own. If you own 100 shares and sell 2 contracts, you are short calls on 200 shares while owning 100 shares — leaving 100 shares of short call exposure uncovered (naked).
When traders use this strategy
– To generate extra income on a long stock position when implied volatility is relatively high and the trader expects the stock to remain in a narrow range.
– As an active, directional income tactic for experienced traders who can monitor assignment risk and manage margin.
– Not appropriate when a big move up is expected, because upside losses on uncovered short calls can be large.
Concrete example (step‑by‑step with numbers)
This analysis assumes that…
– You own 100 shares of STOCK purchased at $100.
– You sell 1 call contract with strike $105 (short lower strike) for $3.00 per share, and sell 1 call contract with strike $115 (short higher strike) for $1.00 per share. Total premium received = ($3 + $1) × 100 = $400. (You have sold 2 contracts for 100 shares owned — 1 contract is covered, 1 contract is uncovered.)
Step 1 — Compute maximum profit:
– If the stock finishes between the two short strikes (between $105 and $115), the lower‑strike call will be exercised and the higher‑strike call will expire worthless. You will have sold your 100 shares at $105 (you owned them), realizing $5 × 100 = $500 on stock, plus the $400 premium = $900 total. Thus, maximum profit = $900 (or $9 per share).
Step 2 — Find breakeven points:
– The strategy has two breakevens (upper and lower). Using the common representation:
• Upper breakeven = higher short strike + points of maximum profit (PMP)
• Lower breakeven = lower short strike − PMP
Where PMP = maximum profit expressed as points per share (= max profit / number of base shares).
– In our example: PMP = $9 per share.
• Upper breakeven = 115 + 9 = $124
• Lower breakeven = 105 − 9 = $96
Step 3 — Outcomes at expiration:
– If STOCK ≤ $96: you lose on the stock more than the premium you received (loss increases as the stock falls; downside limited to stock going to zero).
– If $96 < STOCK ≤ $105: your overall trade is profitable (you keep premium and small stock gains/losses).
– If $105 $115: losses increase as the stock rises above the upper breakeven ($124) — because the uncovered portion of the short calls begins to cause net losses. Losses can be very large as price rises.
Why the strategy can be dangerous but useful
– Downside: losses on the long stock are limited to the stock falling to zero (less the premium collected). That is a finite but potentially large loss.
– Upside (the bigger concern): because you’re typically short more calls than you have shares to cover, a large price rally forces you to meet margin requirements and may produce very large losses on the uncovered portion of the short calls (in principle unlimited as price can rise arbitrarily).
– Benefits: if the stock remains in the target range, you keep the premium and can realize a decent yield on the position. It can also be adjusted into other spreads by buying calls to cap upside risk.
Practical steps to set up and manage a variable ratio write
Before you trade
1. Know your objectives and limits: maximum acceptable loss, desired income, and time horizon.
2. Check margin rules and buying power with your broker. Selling uncovered calls increases margin and assignment risk.
3. Select a stock you expect to be range‑bound in the option timeframe; check liquidity and option spreads.
Trade construction
1. Determine the base lot (usually 100 shares). Decide the ratio of calls to sell per 100 shares.
2. Choose target strikes: typically a lower (nearer/ITM) short strike and a higher (OTM) short strike. The ideal strikes depend on how much premium you want and the price range you expect.
3. Compute premiums and total cash received. Convert total dollars to per‑share PMP if you want to compute breakevens.
4. Calculate maximum profit, upper and lower breakeven points, and worst‑case loss scenarios. Make sure you can meet margin requirements.
Place the trade
– Use limit orders to control execution price. Enter the stock (if you don’t already own it) and the option sells simultaneously if possible (some brokers allow multi‑leg orders). Confirm contract sizes (1 option contract = 100 shares). Verify commissions and assignment risk.
Position management and exit rules
– Monitor the stock and the implied volatility. Be ready for early assignment (especially on short in‑the‑money calls when dividend dates approach).
– To limit upside risk, you can buy one or more calls to convert the position into a ratio spread (e.g., buy 1 call at a higher strike to cap loss on the uncovered portion). That increases cost but limits upside risk.
– You can roll short calls (move to later expiration or different strikes) to adjust exposure. Rolling may require additional margin.
– Consider closing the short calls early to lock profits or limit losses, especially after large stock moves.
– Have predefined stop‑loss or risk thresholds (e.g., close or hedge when the position loses X% or when the stock moves beyond breakeven).
Variations and risk‑mitigants
– Buy a long call at an even higher strike to limit potential upside losses (creates a ratio call spread with limited upside loss in exchange for lower maximum profit).
– Reduce the ratio (sell fewer short calls per 100 shares) to reduce naked exposure.
– Use shorter expirations if you want faster time decay income but be mindful of assignment risk.
– Use smaller position sizes initially — this is an advanced strategy and should be sized so a large move cannot cause catastrophic portfolio damage.
Tax, margin and broker considerations
– Assignment, exercise, and wash‑sale rules can complicate tax outcomes. Option premium and stock sale timing affect short‑term vs. long‑term gains/losses. Consult a tax advisor for specifics.
– Brokers require margin for uncovered option exposure. Know the maintenance requirements, possible margin calls, and your ability to satisfy them. Some brokers may restrict ratio or naked positions for retail traders.
Checklist before placing a variable ratio write
– I understand the ratio and exactly how many contracts I am selling relative to shares.
– I computed maximum profit and both breakeven points.
– I have a plan to manage or cap upside risk (buy calls, buy more stock, or predefined exit).
– I have verified margin requirements and assignment procedures with my broker.
– I have a defined exit/hedge plan and size the trade to fit portfolio risk limits.
Summary and final cautions
A variable ratio write can generate attractive premium income when the trader expects a stock to remain in a relatively narrow range. It produces a defined region of maximum profit but exposes the trader to potentially very large losses if the stock rallies sharply — because more call exposure is sold than the trader has covered by long shares. The strategy is advanced, requires active monitoring, and should only be used by traders who understand assignment risk, margin requirements, and how to hedge or convert the position if the market moves against them.
Source
– Investopedia, “Variable Ratio Write,” Theresa Chiechi. Accessed July 23, 2021. (Clarifications and numerical example here follow standard options payoff arithmetic and are provided to illustrate breakeven and risk mechanics.)
Editor’s note: The following topics are reserved for upcoming updates and will be expanded with detailed examples and datasets.
(a) build a spreadsheet template to compute max profit and breakevens for your custom ratios and strikes, or (b) show a few additional numeric scenarios (different strike choices) so you can see how changing strikes or ratios affects risk. Which would you prefer?