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Basics
Index Options vs ETF Options (SPX vs SPY)
SPX and SPY track the same index but are different kinds of option — and the index-vs-ETF distinction drives settlement, taxes, and assignment.
NoVo Options Trading · 2026
Index options (like SPX) are cash-settled, European-style, and may get favorable tax treatment; ETF options (like SPY) are physically settled, American-style, and smaller. Same underlying index, different mechanics.
Index options (SPX, XSP)
These are options on the index itself — cash-settled (no shares), European-style (no early assignment), and potentially eligible for Section 1256 60/40 tax treatment. SPX is large (~10× SPY); XSP is a SPY-sized version. Clean at expiration, tax-friendly, but lighter liquidity than SPY.
ETF options (SPY)
These are options on the SPY ETF — physically settled (shares if held ITM), American-style (early assignment possible for sellers), and retail-sized. SPY is the most liquid with the tightest spreads and the deepest ecosystem. Simpler and cheaper to trade, with the physical-settlement mechanics to manage.
Index options settle to cash with tax perks and no early assignment; ETF options settle to shares with tighter spreads and a huge ecosystem. Same index, different plumbing.
Which to trade
For maximum liquidity and simplicity, SPY (what NoVo trades). For cash settlement, no early assignment, and possible tax benefits — especially at size — SPX or XSP. See best index for 0DTE to weigh them all.
More on this: What Is a Mini Option?
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NoVo is a software tool for market analysis and for executing trades you initiate, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.