Time Value Decay Analysis

Time value decay analysis, often called theta decay, measures the rate at which an option loses its value as it approaches its expiration date. Because options have a finite life, the probability of them finishing in the money decreases over time, causing the extrinsic value to erode.

This decay is non-linear, accelerating significantly as the expiration date nears, especially for at-the-money options. Traders use this analysis to determine whether to be buyers or sellers of options.

Sellers of options aim to profit from this decay, while buyers must ensure that price movement outweighs the daily loss of time value. It is a fundamental metric in managing long-term derivative portfolios.