We’re holding $50,000 in 8 sinking funds but only spend $5,000 a month: are we being too conservative?

On a recent episode of the Money Guy Show titled He’s Working 60 Hours a Week to Retire Early… Is It Worth It?, co-host Brian Preston told a couple sitting on more than $50,000 across eight sinking funds that “you’re probably majoring in the minors”. His example: a dedicated bucket for $11 a month to cover annual car registration. The couple spends $5,000 a month but budgets their emergency fund against $10,000 a month in projected expenses.

Cash that sits in checking or low-yield savings to cover hypothetical spending does not compound. Over a working career, the gap between holding excess cash and investing it is measured in years of retirement.

The verdict: Preston is right, and the math is brutal

The correct answer is to size the emergency fund to actual spending, not aspirational spending. A standard six-month emergency fund at $5,000 of real monthly outflow comes to $30,000. Anything beyond that is either a true sinking fund for a known future purchase or idle capital.

Here is the opportunity cost on the extra cash. Twenty-six-week Treasury bills are currently yielding roughly 3.8% and 52-week bills are right around the same level. If the full $50,000 were parked in 52-week T-bills, it would earn roughly $1,905 a year. If half sits in a non-yielding checking account because it is scattered across eight buckets at a brick-and-mortar bank, the household is voluntarily forfeiting close to a thousand dollars annually for the comfort of mental accounting.

Stretch the time horizon. A couple that consistently keeps $20,000 more cash than they need over 25 years, at a 7% real return inside a brokerage or retirement account, ends up with far less retirement income than if that capital had been invested. Preston’s framing is precise: “when you add efficiency, generally, you tend to add effectiveness, which would prevent you from holding so much cash and maybe have some of that cash working for you”.

The micro-bucket logic also breaks down on small expenses. Preston pointed to a $1,800 water softener as the kind of purchase that “could just kind of probably come out of that. That’s not something that necessitates a sinking fund”. When a household runs a meaningful monthly surplus, sub-$2,000 line items belong in cash flow, not in a labeled jar.

The variable that flips the answer: actual monthly surplus

The one number that decides whether $50,000 in sinking funds is prudent or wasteful is how much surplus the household generates each month after fixed costs and investing.

Scenario A: A couple earns $9,000 a month, spends $5,000, and invests $2,000. They have $2,000 of true discretionary cash flow every month. A $1,800 water softener, a $900 vet bill, or a $1,500 car repair can be absorbed without touching a sinking fund. The right structure is a $30,000 emergency fund plus targeted buckets only for items above roughly $5,000, such as a planned car replacement or a wedding.

Scenario B: A couple earns $5,500 a month and spends $5,000. They have $500 of cushion. A $1,800 water softener requires a sinking fund, because cash flow cannot absorb it. Granular buckets are rational because volatility in any single month threatens the next bill.

The couple Preston was advising is in Scenario A. Eight sinking funds in a Scenario A household are an emotional comfort, not a financial necessity.

Context: most US households are undersaving

The U.S. personal savings rate sits at 4.0% in the first quarter of 2026, down from 6.2% two years earlier. Consumer sentiment is at 49.8, a recessionary reading. Most households are undersaving. The critique here applies to disciplined savers whose conservatism has crossed into inefficiency.

What to do this week

1. Recalculate the emergency fund against real spending. Pull the last 12 months of bank and credit card statements, average actual outflows, and set the target at three to six months of that figure.
2. Collapse the small buckets. Any sinking fund covering an annual expense under roughly $2,000 (registration, subscriptions, minor maintenance) gets folded into monthly cash flow if surplus income allows.
3. Keep sinking funds only for large, dated purchases. A car replacement, a kitchen renovation, a known medical procedure. Each needs a target dollar amount and date.
4. Move excess cash to a yielding instrument. A Treasury money market fund or laddered T-bills at 3.68% to 3.81% is the minimum acceptable yield on idle cash today.
5. Redirect the freed capital to investments. If the household is already maxing tax-advantaged accounts, the next dollar goes to a taxable brokerage in a diversified equity allocation.

Preston’s point is simple: precision about small things can hide imprecision about the big thing, which is how much capital you are letting sit still.