Credit Spread Optimizer

Buying options requires the underlying to move significantly in your direction to profit, and you fight time decay every day. Credit spreads profit from the underlying NOT moving against you - you win if price stays favorable, moves slightly your way, or even moves slightly against you (within your buffer). Time decay works FOR you, and you win more often (typically 65-75% win rate). The trade-off is capped profit and larger losses when wrong.

Credit spreads require margin equal to the spread width minus credit received (your maximum loss) multiplied by the contract multiplier. For a FTSE 100 100-point spread with 25-point credit, margin is approximately 75 pts x £10 = £750 per contract. This is much lower than naked option margin. Different brokers have different margin policies - some give full spread benefit, others may require more. Check with your broker for exact requirements.

For FTSE 100 index options, in-the-money options are cash-settled (European-style) - you receive/pay the difference and your long option partially offsets it, so the net result is your maximum loss (spread width minus credit), with no assignment to manage. For UK single-stock options (American-style, physically settled), assignment may occur - you may need to deliver or receive shares, and any shares you buy on assignment attract 0.5% SDRT. There is NO securities transaction tax on the options themselves in the UK. Still, close positions before expiry to avoid pin/gamma risk and single-stock assignment complications.

In theory, no - the long option protects you. In practice, there are edge cases: gap openings can cause slippage if you're trying to close, early assignment on single-stock options (American-style) may require temporary capital and trigger 0.5% SDRT on any shares received, and illiquid single-stock strikes can widen at the worst moment. There is no securities transaction tax on UK options. The defined max loss assumes you hold to expiry or close at fair value. Gaps and illiquidity can cause slightly worse outcomes, but the long option fundamentally caps your risk.

For beginners, monthly options are recommended. They have slower theta decay (less time pressure), lower gamma (more forgiving of mistakes), and fewer decisions (12 trades per year vs 48+). Weekly spreads offer faster profits but require more active management and have sharper risk characteristics near expiry. In the UK, weekly spreads are only practical on the FTSE 100 (single-stock options are mostly monthly). Start with monthly, master the mechanics, then experiment with weekly if you want more frequent trading.

Use both together for best results. Start with delta to identify the probability range you're comfortable with (e.g., 0.28 delta = 72% win rate). Then verify the resulting strike aligns with technical levels. If 0.28 delta puts your short strike at 8,350 but major support is at 8,300, consider adjusting to 8,300 (even if delta is slightly higher). Technical levels add conviction beyond pure probability.

Close for loss when: your thesis is invalidated (support/resistance broken), rolling only possible for debit, you've already rolled twice, or the new strikes wouldn't be trades you'd take independently. Roll when: thesis still intact (temporary pullback), can roll for net credit, comfortable with extended time in trade, and new position has acceptable risk/reward. Key: rolling should feel like opening a new good trade, not desperately extending a bad one.

Unlike India, the UK levies no securities transaction tax on options, so there is no STT penalty for letting options expire. The real expiry-day risks are different. First, pin/gamma risk: near expiry, gamma at the short strike explodes and small moves cause large P&L swings. Second, for UK single-stock options (American-style, physically settled), an ITM short leg can be assigned - you may have to deliver or receive shares, and buying shares on assignment triggers 0.5% SDRT. FTSE 100 index options are cash-settled European-style, so there is no assignment, only cash settlement to your max loss. Best practice: close positions before expiry if there is any chance of ITM expiration - to avoid gamma whipsaw and single-stock assignment, not because of any transaction tax.

For most traders, closing is usually better than complex adjustments. Adjustments (rolling, converting to iron condor) can work but add complexity, extend time at risk, and may lead to over-trading. The simple approach: enter with plan, exit at predetermined levels (profit, loss, time), deploy capital to new opportunity. Reserve adjustments for high-conviction situations where you're confident the adjustment improves expected value, not just delays losses.

Use: Required Win Rate = Max Loss / (Max Loss + Max Profit). For a spread with 70 pts max loss and 30 pts max profit: 70/(70+30) = 70% breakeven win rate. Any win rate above 70% is profitable. Targeting 0.25-0.30 delta (70-75% expected win rate) with 28-33% credit (70-72% breakeven) gives small positive edge. Transaction costs require additional 2-3% buffer. Track actual win rate to verify edge exists.

In bullish regimes: overweight bull put spreads (positive delta), maintain portfolio delta +0.1 to +0.2. In bearish regimes: overweight bear call spreads (negative delta), target -0.1 to -0.2. In high-vol regimes: size down (larger potential moves), widen strikes, avoid additions. In low-vol regimes: standard sizing, tighter strikes acceptable. Track portfolio vega - in uncertain environments, reduce negative vega exposure to limit IV spike damage. Rebalance weekly based on market assessment.

The theoretical edge is zero (efficient markets). Practical edges come from: 1) Volatility risk premium - selling options captures the gap between implied and realized volatility (~2-3% annual edge), 2) Behavioral edge - systematic traders avoid panic selling that loses money, 3) Time decay asymmetry - theta accelerates non-linearly favoring sellers, 4) Strike selection skill - technical analysis can improve hit rate 3-5% over pure probability. Combined edge: 3-8% annually over theoretical with consistent execution.

Early bull market: full size bull puts, reduced bear calls. Late bull market: reduce bull puts (complacency risk), balanced positioning. Bear market: reduced overall size (larger moves), emphasis on bear calls or wider strikes. High VFTSE spike: pause new entries until the VFTSE stabilizes, existing positions may be profitable to close early. Recovery: gradually increase size as the VFTSE normalizes. Track your performance by VFTSE regime to identify which environments suit your system best.

The UK has only one deeply liquid index option (the FTSE 100), so stacking several FTSE 100 spreads is not diversification - it is one concentrated bet. True diversification requires: 1) Adding genuinely uncorrelated underlyings (selected single-stock options across different sectors), 2) Diversifying by time (different expiries), 3) Diversifying by direction (a mix of bull put and bear call spreads). Calculate your portfolio correlation matrix. If correlation-adjusted VaR exceeds acceptable levels, reduce position count or add truly uncorrelated positions. In a crisis, correlations go to 1 - always have cash reserves.

Track per trade: underlying, direction, delta at entry, IV percentile at entry, DTE at entry, credit received, width, exit type (profit/loss/time), days held, P&L. Analyze: win rate by delta bucket, win rate by IV bucket, average P&L by DTE bucket, win rate by direction, performance by VFTSE regime. Use statistical tests (chi-square, t-test) to determine if observed differences are significant. Minimum 50 observations per bucket for meaningful analysis. Automate data collection and dashboard reporting for consistency.