Time decay as a decision variable in an NVDA bull call spread

The illustrated NVDA construction

The archive specifies a same-expiry NVDA bull call spread by buying the August 15 140 call and selling the higher-strike August call. The sold premium reduces the net debit.

That structure is a vertical debit spread: a same-expiration call pair bought at a nearer strike and sold at a farther strike, entered for a net debit. As a bull call spread, it profits if the underlying rises enough to cover the net premium paid.

The archive presents the position as an option spread, a defined-risk combination of long and short options used as a single, testable entry-exit procedure.

In the illustrated construction the long 140 call is priced at 10.35 and the short call at 3.10. The net debit and the stated maximum risk equal the difference between those premiums.

Breakeven and time decay

Expiration breakeven for that debit spread is the 140 long strike plus the net premium paid. In this usage, breakeven price means the underlying price at expiration that recovers the net premium paid on the spread.

Above roughly 150.41 in the underlying, the illustrated risk curves rise as time passes. The short higher-strike call loses time premium faster than the long 140 call.

Time decay is the daily erosion of option premium. In a debit spread it can help or hurt depending on the underlying price. Option premium analysis here means reading how time premium and implied carry change P/L as the underlying moves and days pass.

Stock and long-call contrast

The archive contrasts this defined-risk debit spread with long stock and long calls. It notes that time decay can work against an outright long call whose breakeven sits 13.8 percent above the then-current share price.

Delta as a rule input

Position delta is presented as a rule input so the trader can scale expected P/L per one-point move in NVDA before committing capital. Delta is the expected change in position value for a one-point move in the underlying.