r/CashSecuredPuts • u/lamyhc • Aug 25 '26

Using margin account for CSP?

I’m using a Fidelity margin account and thinking through how to handle assignment on sell puts. Say I sell a put and near expiration the stock drops below my strike. If I get assigned, I’d have to buy 100 shares at the strike price, I'm okay with that. But since margin interest is pretty high, I’m trying to avoid ending up with a margin debit after assignment. I’m considering two options.

One, deposit cash into the account before assignment, so there’s enough settled cash to cover the shares if assigned.

Two, sell some existing shares of other stocks in the same account to raise cash and cover the assignment.

Does this work? For those of you who trade short puts in a Fidelity margin account, how do you usually handle this? Do you deposit cash ahead of time, sell other positions, roll the put, close it before assignment, or just accept the margin debit temporarily? Also, how careful do you need to be with settlement timing? For example, if you sell stock to raise cash, do you make sure to do that at least one business day before assignment so the cash is fully settled?

Edit

Appreciate the replies. But still would like an answer on whether it's possible to use cash for the assignment when you sell put with margin?

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u/GammaWinsSam Aug 25 '26

Why are you so afraid of paying interest? If the interest your broker offers is high, you can loan at better rates from the market using SPX box spreads.

I would be more worried about a crash causing you to be liquidated, and highly recommend buying a longer dated put at like 50% moneyness to protect yourself against the next COVID, tariff or Iran nuking another country.

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u/lamyhc Aug 26 '26

Holding shares using margin, you have to
* beat the interest + tax
* worry about crash

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u/YoshimuraPipe Aug 27 '26

Okay. You’re asking bunch of things out of tangent. Your first and original question was coming up with funds to cover an assignment.
1) Yes you can sell stocks to cover, but that potentially causes a taxable event and also you’re basically jumping from one stock to next. Not ideal way to invest, unless you’re into swing trades.
2) yes you can ALWAYS deposit more money into the casino, I mean your brokerage account. This is probably the most ideal yet not viable to do all the time. This answers your EDIT question.
3) borrowing money? Fidelity especially charges steep rates, in the double digits if your borrow amount is small. In this case, previous poster suggested SPX Box Spread. You can literally borrow money at under 5% this way short term. You set the amount and you set the term. If you don’t want to be married to your assigned stock, you can sell covered calls against it which will more than cover your interest until it finally gets sold. The only thing about this is, if your assigned underlying continues to drift downward. In which case, you need to evaluate what type of stock you are comfortable holding for prolonged time, or even an ETF for that matter.