TROC

TROC stands for Tastytrade Return On Capital. It's a metric popularized by the Tastytrade trading platform and education network for comparing options income trades against each other. It answers a simple question: for the amount of buying power a trade ties up, how much theta (time decay income) is it generating per day?

The calculation is theta divided by buying power reduction. Theta is the portion of an option's price that erodes each day purely from the passage of time, all else being equal; sellers of options collect this decay as their trades move toward expiration. Buying power reduction (sometimes called margin requirement) is the amount of your account's capital that a broker sets aside as collateral while the position is open, since a short option position carries risk beyond the premium received. TROC essentially converts theta from a raw dollar figure into a rate of return, letting you compare a $2 theta trade tying up $100 against a $5 theta trade tying up $400.

The nuance that trips people up is that TROC is a snapshot, not a forecast. Theta itself shifts constantly as the underlying price moves, as implied volatility changes, and as expiration approaches, so a trade's TROC on the day you open it says little about its TROC a week later. It's also not annualized by default, so a 0.5% TROC per day looks small until you multiply it out, and traders comparing strategies need to normalize the time horizon to avoid an apples-to-oranges comparison. Finally, TROC says nothing about the probability of loss or the size of a potential loss; a trade can show an attractive TROC while still carrying substantial tail risk if the underlying moves sharply against the position.