How Much Capital You Actually Need to Sell Puts

Most content selling you on put-writing quietly skips the part where the math says your account is too small — so let me say it out loud.

I get asked some version of “how much do I need to start selling puts” constantly, and the honest answer annoys people because it is bigger than they hoped and it comes with a lecture about lumpiness. But I would rather annoy you now than have you concentrate your whole account into two names because nobody told you the trade comes in chunks.

The thing nobody mentions: puts come in 100-share lumps

A cash-secured put on a stock obligates you to buy 100 shares at the strike. To secure it with cash, you reserve strike times 100 for the entire life of the trade. That is not a margin number you can fudge — it is the actual money set aside to honor the obligation if you are assigned.

This means your position sizes do not come in smooth increments. They come in 100-share lumps. One put on a 20-dollar stock locks up 2,000 dollars. One put on a 200-dollar stock locks up 20,000. You cannot sell “a little bit” of a put. The smallest unit is one contract, and one contract can be a large fraction of a small account. Proper diversification — spreading across enough names that no single assignment hurts — therefore takes real capital. More than the YouTube thumbnails imply.

A worked example, because the abstraction hides the problem

Let me run actual numbers on a 100,000-dollar account, which most people would call comfortably mid-sized.

Look at the last two rows. A single put on a fifty-dollar stock requires 5,000 dollars of collateral. My per-name cap is 3,750. The smallest possible position is already over the cap, and there is no way to make it smaller — you cannot sell half a contract.

So here is the uncomfortable conclusion that falls straight out of the arithmetic: a 100,000-dollar account simply cannot run cash-secured puts on fifty-dollar-and-up stocks while keeping tight, sensible per-name sizing. The lump is bigger than the cap. You are forced into one of two compromises — concentrate more than you would like, or restrict yourself to lower-priced underlyings where the lumps are small enough to fit.

The honest threshold

Here is the rule I actually use to decide whether an account is big enough to do this the conservative, diversified way: if you cannot fit at least eight to ten names inside your caps, the account is too small to run it properly.

Eight to ten names is roughly where a single assignment going against you stops being a body blow and becomes a manageable nuisance. Below that, one bad name is too large a share of the book, and you are not really running a diversified put-selling program — you are making a few concentrated bets with extra steps. There is nothing morally wrong with concentrated bets, but call them what they are and size them as such.

Run the 100,000-dollar account against that test. With a 5 percent per-name cap and fifty-dollar-plus stocks, you cannot get to eight to ten names with full collateral and a real cash buffer. The math says: not yet, not on those underlyings, not this way. And that is completely fine. It is not a verdict on you. It is a verdict on the size of the lumps relative to the size of the account.

What a smaller account can actually do

If the diversified version does not fit yet, you have three honest options. None of them are scams and none of them require pretending the math is different than it is.

• Accept more concentration, deliberately. Run three or four names you would be genuinely thrilled to own at the strike, size them honestly, and accept that one assignment will be a meaningful chunk of the book. The discipline here is brutal name-selection — with fewer positions, each one has to be a name you would happily hold through a recession.
• Use lower-priced quality underlyings. A solid company trading at 15 or 20 dollars produces 1,500-to-2,000-dollar lumps that fit inside a small-account cap. The constraint is that “quality and cheap per-share” is a smaller universe, and you must not let the low price talk you into junk. Low share price is not a discount on quality.
• Keep building capital first. The least glamorous answer and frequently the right one. There is no rule that says you must be selling puts this quarter. Adding to the account is itself a strategy, and a boring deposit compounds more reliably than a clever trade in an account that is too small to absorb a mistake.

Income before wealth, and no shame in not being there yet

Underneath all the arithmetic is a principle I will not soften: the capital you sell puts with should be discretionary money you can genuinely afford to lose. Not your emergency fund. Not your rent. Not your survival capital. Selling puts is a strategy that pays you steady premium most of the time and occasionally hands you a stock at a loss in the worst conditions — and you only get to keep playing if the worst conditions do not threaten your actual life.

That is the real reason the threshold matters. It is not snobbery about account size. It is that a too-small account forces you to either over-concentrate or deploy money you cannot afford to have stuck in a falling stock, and both of those are how people get hurt doing something that is supposed to be conservative.

So if the numbers in this post just told you that you are not there yet, that is not a failure. That is the math doing its job before the market does it for you. The path to a bigger account is not a secret. It is hard work, a little luck, and above all discipline about how you spend — the same discipline that makes a good put-seller in the first place. Get the size right and the strategy is durable. Get it wrong and no entry rule, no strike selection, no clever roll will save you.

When you do want to test specific numbers against your own caps, the Position Sizer in the toolkit does this arithmetic for you so you can see the lumps before you trade them. And if you want to see what the premium is actually worth on the capital you tie up, the annualized return on a cash-secured put guide walks the math honestly.

Educational only — not investment advice, and not a recommendation to buy or sell any security. Options involve a substantial risk of loss.