Bond Ladders or Money Market Funds for Reserve Cash

A government money market fund is a pooled fund that holds short-term government securities and is priced to maintain a stable share value, giving you same-day or next-day liquidity in most cases. A Treasury bond ladder is a set of individual Treasury bills or notes you hold directly, with staggered maturity dates, so a portion comes due on a predictable schedule rather than all at once.

The money fund is a single position you can add to or redeem from continuously; the ladder is a series of discrete positions you build and then let mature on their own timeline.

A money market fund gives you access to the full balance whenever you need it, which makes it the more forgiving choice when your cash needs are unpredictable. A bond ladder only frees up cash as each rung matures, or you sell a position early, which can mean accepting a slightly worse price if rates have moved since you bought it.

If your reserve cash genuinely might be needed on short notice, that liquidity difference matters more than a small yield gap. If you're confident about the timing of when you'll need each portion, the ladder's scheduled maturities can actually match your cash needs more precisely than a fund that gives you everything or nothing.

Because a ladder holds the underlying securities directly rather than through a fund with its own operating costs, it typically captures a slightly higher net yield than a comparable money market fund, though the gap has narrowed as fund expense ratios have come down over the years. The size of that edge changes with the rate environment and isn't guaranteed to hold in every period.

The yield gap alone rarely justifies a ladder for a smaller reserve balance, since the operational effort of managing individual maturities outweighs a small yield difference until the balance is large enough.

A money market fund requires essentially no ongoing management beyond the initial decision to hold it. A ladder requires someone to track maturity dates, decide whether to reinvest each rung as it comes due or let it roll to cash, and adjust the ladder's structure as rates or cash needs change. That's a real, recurring task, not a one-time setup.

For a finance team without a dedicated treasury function, that ongoing management burden is often the deciding factor against a ladder, independent of the yield math.

A common approach is a money market fund for the reserve tier you might need on short notice, and a ladder for the strategic reserve tier you're confident you won't touch for at least the length of the ladder's longest rung. That split captures the ladder's yield edge on the money you can commit, while keeping the money you can't commit fully liquid.

Revisit the split whenever your burn multiple shifts meaningfully, since a company burning through cash faster than expected should lean more toward the fully liquid option even if it means giving up some yield¹.

A common way to divide reserve cash between the two:

• Hold cash you might need on short notice in a government money market fund, which allows continuous access to the full balance.
• Put strategic reserve you won't touch for at least the ladder's longest rung into a Treasury bond ladder.
• Assign someone to track maturity dates and decide whether each rung reinvests or rolls to cash.
• Revisit the split and the ladder's structure whenever rates or your cash needs change.

Selling a Treasury position before maturity is generally straightforward since the secondary market for Treasuries is deep, but the price you get depends on where rates have moved since you bought it. If rates rose after you bought a rung, you'll likely sell it at a discount to what you paid; if rates fell, you may actually come out ahead. Either way, that price uncertainty is the real cost of early access, distinct from the scheduled maturity dates you planned around.

Build the ladder with rungs short enough that you're unlikely to need an early exit at all, rather than relying on the secondary market as your main liquidity plan.