Learn how interest-rate changes can affect call and put premiums, especially for longer-dated options.
Call and put rho
Purchased calls normally have positive rho because higher rates can increase call values. Purchased puts normally have negative rho because higher rates can reduce put values under standard pricing assumptions.
Why time matters
Interest-rate carrying effects accumulate over time, so long-dated options usually have greater absolute rho than near-term contracts. Higher-priced underlyings may also create larger rate sensitivity.
When to pay attention
Rho may be small for short-dated equity options but can matter for LEAPS, large portfolios or meaningful rate shifts. Models and brokers may also use different rate inputs, so displayed values can vary.
A practical example
A long call has rho 0.32. If the relevant modeled rate rises from 3% to 4%, its theoretical premium may rise about $0.32 per share, assuming every other input is unchanged.
This simplified example isolates selected sensitivities so their interaction is easier to understand. Live option prices also reflect the underlying price, time decay, rates, dividends, liquidity and transaction costs. Greeks are theoretical estimates, not guarantees.
Frequently asked questions
Is rho positive for calls?
A purchased call generally has positive rho; selling it reverses the position exposure.
Why is put rho negative?
Higher rates generally reduce the present value associated with the strike, lowering put value under standard assumptions.
Does rho matter near expiration?
It is usually smaller because little time remains for carrying costs to accumulate.
Continue the All Greeks in Action cluster
Explore related guides: Option Greeks for a Long Call · Option Greeks for Straddles and Strangles · Option Greeks Scenario Analysis. For a structured sequence, use the free Level 8 – All Greeks in Action course.
Options involve risk and are not suitable for every investor. This material is educational and is not investment, tax or legal advice. Greeks are theoretical estimates, and contract terms and broker requirements can vary.