59½ Is the Line. If You're Close, These 4 ETFs Are the First Move With 401(k) Cash

59½ changes the priority: access matters more than upside

Why 59½ is the real decision point

59½ is the line. Before that birthday, the bigger risk is not picking the wrong fund. It is triggering a 10% additional tax on early distributions while giving up more time for the money to compound. After that birthday, the question shifts from penalty avoidance to cash planning.

One more year in the market can help, but it can also put accessible retirement money at risk right before you may need it. If the cash is already earmarked for use, preservation and access should come before the search for extra return.

The rulebook also has more exception paths now, including in-plan emergency and domestic-abuse distributions that plans must be ready to amend by December 31, 2026. Even so, the first move does not change: when 59½ is near, protecting optionality matters more than playing hero.

Cash should do one job: stay intact and usable

Why cash comes first after the penalty window closes

Once the access question is settled, the portfolio's job gets narrower. A first-move sleeve should protect principal and stay liquid. That is why money market funds still matter. They invest in highly liquid, short-term debt, seek a stable $1 NAV, and are built for short-term cash needs.

It is easy to reach for something "safer" that still carries more risk than intended-short-duration bonds, dividend funds, or so-called defensive equities. The problem is that those are still market bets. If the goal is dry powder, that defeats the purpose.

Waiting can still pay, and staying liquid can stay cheap

The macro backdrop also makes parked cash easier to justify. The Fed has been in a rate-cutting cycle since September 2024, but that does not mean cash stopped earning anything. Earlier in that cycle, money market yields of 5% or more were common. Even now, cash can still produce yield without taking the kind of downside risk found in bonds or equities.

Fees also stay low. Vanguard's money market fund expense ratios run from 0.07% to 0.12%. Money market ETFs can span 0.05% to 0.72% in total expense ratios. For a holding whose job is liquidity, that is a cheap price for stability.

Money market mutual funds vs. ETFs

If simplicity matters most, a money market mutual fund is the cleaner choice: highly liquid and built for cash management. ETFs can work too. One example is the State Street Prime Money Market ETF, which lists a 0.18% gross expense ratio and a 38-day WAM.

A few tradeoffs to keep in mind: - Yields will likely keep resetting lower as the policy rate falls from 5.5% to 3.75%. - Money market funds are not FDIC-insured and still carry credit, rate, liquidity, and inflation risk. - ETF wrappers add trading mechanics; mutual funds offer familiar cash-management simplicity.

The first move is not to chase yield. It is to keep the money whole, cheap, and ready.

The ETF screen: simple, boring, and easy to apply

What actually matters in a cash fund

The right screen is short: Weighted Average Maturity, low trading friction, and low costs. In a rate environment that has already moved lower, a shorter WAM can help limit sensitivity as yields drift down, while fees determine how much of the cash cushion survives.

The choice set is also narrower than it looks. There are 14 ETFs on the money market tracking 9 indices, with expense ratios ranging from 0.05% to 0.72%. That spread is small enough that over-optimizing usually creates more noise than value.

A practical watchlist: SWKXX, MMK, and SWTXX

The headline mentions four ETFs, but only three distinct fund vehicles are supported in the cited material here. SWKXX and MMK serve as the baseline cash options, while SWTXX is a conditional add-on for tax-sensitive situations.

1) SWKXX - the plain-vanilla benchmark

Start here. SWKXX is a simple reference point for a cash sleeve. Its 1-year annualized returns of 1.87% monthly and 1.92% quarterly show what cash should do in this setting: preserve optionality without pretending to be an income strategy.

2) MMK - the ETF alternative

If the goal is an actual ETF wrapper, MMK is the clearest watchlist candidate in the cited material. It has a 38-day WAM and a 0.18% gross expense ratio, which fits the low-friction cash profile.

3) SWTXX - the tax-exempt option, only if the math works

Schwab lists Schwab Money Wizard Treasury Fund in its money market lineup. SWTXX only makes sense if the tax-exempt yield beats the after-tax yield of a standard cash fund in your bracket. If that math does not work, it stays off the shortlist.

Before you move the money, confirm the distribution path

1. Confirm access before optimizing yield. If you are still employed, elective deferrals generally cannot be distributed unless you have a severance from employment, the plan terminates, or you meet another allowed path such as disability, death, age 59½, or financial hardship. If the plan will not release the money, fund selection is irrelevant.

2. Use the cash-first sleeve only if the money is reachable. That means SWKXX as the baseline benchmark at 1-year annualized returns of 1.87% to 1.92%, or a low-cost money market ETF screen ranging from 0.05% to 0.72% expense ratios. If the cash has to wait for distribution, stability matters more than optimization.

3. Add tax efficiency only after steps 1 and 2 clear. If the distribution is available and you want a tax-exempt alternative, that is where Schwab Money Wizard Treasury Fund belongs-as a specialized option, not the default.

4. Know when the thesis fails. The cash-first approach stops making sense if the funds are locked, if you need income immediately and cannot wait for a clean distribution path, or if you are reaching for higher yield just to feel active.

Hard line: if you cannot get to the money cleanly, the best fund is the one you do not trade.