Keeping Enough Cash in Reserve

In short

Holding cash in reserve — not fully deploying an account into open positions — provides flexibility to absorb unexpected assignments, compared across two $40,000 accounts, one with a 20% reserve.

A fully deployed account has no room to react when something unexpected happens.

What keeping a reserve means

Keeping cash in reserve means deliberately not committing every available dollar to open positions, even when the collateral math for a new trade technically allows it. It's a buffer that exists specifically for the moments a fully deployed account can't handle.

A worked comparison

Two accounts, each $40,000, both selling cash-secured puts:

	Fully deployed account	Account with 20% reserve
Cash committed to open puts	$40,000	$32,000
Cash in reserve	$0	$8,000
If two puts get assigned unexpectedly	No cash left for anything else	$8,000 still available
If a new attractive opportunity appears	Can't act without closing something	Can act on it directly

The fully deployed account isn't doing anything wrong by the math of any single trade — each position might be perfectly reasonably sized. The problem shows up only when several things happen at once, which is exactly when flexibility matters most.

Why assignment creates this pressure

Multiple cash-secured puts can get assigned around the same time, particularly during a broad market decline that pulls many stocks below their strikes together — not because any individual trade went wrong, but because market-wide moves hit many positions at once. A fully deployed account facing several simultaneous assignments has no cash left to do anything but hold the shares and wait.

What a reserve buys you

Cash in reserve isn't wasted — it's optionality. It lets an account absorb an unplanned assignment without being forced to sell something else at a bad time, and it means a genuinely attractive new trade doesn't have to be passed up just because every dollar is already tied up.

There's no universal "right" reserve size — it depends on how many positions are open, how correlated they are, and how much flexibility you want. The point isn't a specific percentage; it's treating "how much stays uncommitted" as a deliberate decision, not whatever happens to be left over after every attractive trade gets taken.

Key takeaway: cash sitting in reserve costs you some premium in a calm market — that's the price of having flexibility when the market isn't calm.

With individual position sizing and reserves covered, the next module zooms out to how positions interact across the whole portfolio.

This lesson is educational content explaining standard options mechanics, not personalized investment or trading advice.