What is a net debit, and why is a debit roll a warning sign?
In one line: A net debit is when an order with more than one leg, such as a roll or a spread, costs more than it brings in, so money leaves your account when it fills.
How it works
A multi-leg order, like a roll or a spread, shows one net price. If what you pay is bigger than what you collect, it's a net debit. Money leaves your account when the order fills.
For a buyer, paying is normal. For a seller, a debit roll means something different: you're paying to stay in a trade that has moved against you.
Debit rolls usually happen when:
- A covered call is deep in the money and you Roll up to keep the shares.
- A put is deep in the money and you roll to a lower strike without adding enough time.
The opposite is a Net credit: the order pays you.
An example (hypothetical)
You own 100 shares of XYZ, bought at $50 (an illustration, not a trade idea). You sold a $52 call for $1.00 ($100). XYZ runs to $58 with 10 days left. The call now costs $6.20. You don't want to lose the shares.
You roll up and out: buy back the $52 call for $6.20, sell next month's $56 call for $3.00. Net debit: $3.20 ($320). Your premium total is now $100 − $620 + $300 = −$220.
| XYZ at the new expiry | What happens | Your result |
|---|---|---|
| $62 | Called away at $56 | +$600 − $220 = +$380 |
| $56 | Call expires or is assigned | +$600 − $220 = +$380 |
| $50 | Call expires. Shares back to your cost | $0 − $220 = −$220 |
| $45 | Call expires. Shares fell | −$500 − $220 = −$720 |
Now compare with doing nothing. If XYZ had stayed above $52 for ten more days, the shares would have been called away for +$300: $200 on the shares plus the $100 premium.
The debit roll only beats that if XYZ ends above $55.20. Even then, the best case is $80 more. You paid $320 for a shot at $80, and a month more of holding a stock that just ran up. When it slid back, the roll turned a gain into −$220, then −$720.
Why it matters for sellers
A debit roll is the market telling you the trade has gone against you. That doesn't mean you must never do it. It means you should check what you're buying:
- What do I get for the debit? More upside, a lower put strike, more time. Put a number on it.
- What would I have if I just let it go? Called away at your strike, or assigned at your strike.
- Would I open this new position today? If not, the debit is buying a trade you don't want.
Many sellers in the wheel strategy keep a plain rule: roll for a credit or don't roll. Our roll up vs let it get called page works through more cases.
Questions
Is a net debit always bad?
Not for buyers, since paying is how they open a trade. For a seller rolling a position, it's a sign you're paying to delay an outcome you agreed to.
Why would a roll cost money?
You're buying back an option that has grown in value and selling one worth less, usually at a strike further from the price. The gap is the debit.
How do I avoid a debit roll?
Pick strikes you'd be happy to be assigned at, so you don't need to roll. If you do roll, adding time can turn a debit into a credit, though it keeps you in longer.
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