Both options hold essentially the same thing: short-term government debt. A money market fund pools it and gives you a share you can sell any day. A treasury ladder means owning individual bills and notes yourself, spaced so that one matures at regular intervals. The underlying credit risk is the same. Everything else differs.
Choosing between them is a question about a specific pot of money, not a general preference.
This is general information, not investment advice. Tax treatment varies by jurisdiction.
What changed in 2026
- Buying individual treasuries got easier. Brokerage interfaces for purchasing bills at auction and on the secondary market improved, lowering the effort barrier that historically favoured funds.
- Auto-rolling ladders became a product feature. Several brokers added automatic reinvestment at maturity, which removed most of the maintenance argument against ladders.
- State tax awareness increased. As cash yields stayed meaningful, the state tax exemption on direct treasury interest became a larger factor in after-tax comparisons.
- Fund yields tracked policy closely. Money market yields moved promptly with rate changes in both directions, highlighting the reinvestment risk that a ladder mitigates.
The comparison
|
Money market fund |
Treasury ladder |
| Liquidity |
Daily, full |
At each maturity; earlier sale is at market price |
| Yield certainty |
None; floats with rates |
Known per rung at purchase |
| Effort |
Buy once and forget |
Buy rungs; roll at maturity unless automated |
| State tax on interest |
Partially exempt depending on holdings |
Generally exempt where state income tax applies |
| Expense ratio |
Small but real |
None on direct holdings |
| Minimum investment |
Low |
Higher per rung, practically speaking |
| Best for |
Money you might need any day |
Money with a known horizon |
The tax line matters more than people expect for residents of states with income tax. Interest on direct federal obligations is generally exempt from state tax, while a money market fund's distributions are exempt only in proportion to its government holdings — and the proportion varies. On a meaningful cash balance in a high-tax state, that difference can outweigh a small yield gap.
Matching the tool to the money
For an emergency fund, use the fund. The whole point is availability at any moment, and a ladder rung sold before maturity trades at market price, which can be below what you paid if rates have risen.
For money with a known date — a tax payment, a down payment, a planned purchase — a ladder is the better fit. You buy a maturity that lands when you need the cash, you know the yield when you buy, and rate movements in between do not affect what you receive at maturity.
For a large cash balance held indefinitely, a hybrid is sensible: a fund for the portion you might tap and a ladder for the rest. That captures the tax and certainty benefits on the bulk while keeping ready access to a slice.
The directional bet embedded in the choice is worth naming. A ladder locks in current yields, which is good if rates fall and a missed opportunity if they rise. A fund does the opposite. Nobody knows which will happen, which argues for matching the instrument to the horizon rather than to a rate forecast. The longer-dated version of the same logic is in bond ladder strategy.
Common mistakes
- Using a ladder for emergency money. Early sale means market price and possibly a loss.
- Ignoring state tax. In high-tax states it can change which option wins after tax.
- Chasing a marginally higher yield. The difference between good options is usually small relative to the effort and liquidity differences.
- Building rungs too far apart. Wide spacing means long gaps with no maturing cash and more reinvestment risk concentration.
- Forgetting a fund's yield is not fixed. The quoted yield reflects current holdings and moves with rates.
FAQ
Is a money market fund safe?
Government money market funds hold short-term treasury and agency debt, which carries minimal credit risk. They are not deposit-insured, which is a distinction from a bank account.
How many rungs should a ladder have?
Enough that something matures at a frequency matching your possible need — monthly or quarterly rungs are common for cash management.
What about a high-yield savings account?
Simpler, deposit-insured, and the rate can be changed by the bank at any time. Competitive rates make it a reasonable third option, particularly for smaller balances.
Can I hold treasuries directly rather than through a broker?
Yes, through the government's own purchase platform in several countries. Broker holdings are usually more convenient for laddering and selling.
Where to go next
For longer maturities, read bond ladder strategy and bond investing guide. For the on-chain variant of the same instrument, tokenized treasuries explained.