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Position sizing when the premium decays every day

By the OptionGrow research deskReviewed by Ms. Simran Sunil Patil, Research Analyst10 Sep 2026 · 6 min read

Time decay works against option buyers each session. Sizing positions so that a full loss of premium stays within your limits.

This article is educational. It describes how a concept shows up in Indian index and stock options. It does not recommend a trade, a strike or a position size.

What to look for

Time decay works against option buyers each session. Sizing positions so that a full loss of premium stays within your limits. The useful question is what would make the observation stop being relevant, and how large a loss of premium you can accept if it does.

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