Right-Sizing Accounts

Underemployed money

Money in the wrong kind of account isn't lost — it's just underemployed: showing up every day to a job beneath its abilities, earning nothing, costing you the difference. And most households have thousands of dollars in exactly that position, not from any decision but from the absence of one: money lands in checking, and inertia does the rest.

This chapter is the placement guide — four account roles, defined by two questions, with the honest boundary about where this curriculum stops.

Two questions, four roles

Every dollar's right home is determined by two questions: when might I need this money? and what should it earn meanwhile?

Checking is throughput — money in motion for this month's obligations, plus a modest buffer against timing. How modest? Timing Is Everything already computed it: your trough, plus margin. Checking earns approximately nothing, which is fine for money passing through and wrong for money parked. The test: if a dollar has sat in checking through two pay cycles without a scheduled job, it's parked, not passing through.

High-yield savings and money market accounts are the parking level: the emergency buffer (Emergency Buffer Sizing) and near-term goals — the car-repair fund, the trip, the tax bill — earning real interest (competitive accounts have recently run roughly 3.5–4.5% APY; check a live aggregator, since this moves with Fed policy¹) while staying FDIC-insured and reachable in a day. This is where "someday soon" money belongs, and the distance between here and checking is the invisible fee of Idle Cash, collected or forfeited.

CDs trade some access for a locked rate — reasonable for money with a known date (tuition due in 14 months) where the lock is costless because the date is certain; needless for money you might want sooner, where the early-withdrawal haircut buys you nothing.

Investment accounts are for long-horizon money — commonly framed as five-plus years, a standard financial-planning convention (Vanguard's own cash-allocation guidance treats money needed within roughly five years as too short a horizon for stock-market risk)² — where you're accepting market swings in exchange for historically higher long-run returns. And here this lesson stops, deliberately: what that money should be invested in is a different question for you or a registered adviser. The placement decision — which bucket, matched to which date — is the part almost everyone can get right immediately, and it's where most of the recoverable money was sitting anyway.

The worked number

$18,000 sitting in checking "to be safe," when the trough analysis says $4,000 covers the actual timing risk: that's $14,000 underemployed — roughly $500–630 a year of interest not earned at a competitive rate, every year, for the comfort of a buffer that was never actually being used. The comfort was real; it was just unpriced. Priced, most people renegotiate it in an afternoon: $4,000 stays as the working buffer, $14,000 moves one login away and starts earning. Nothing was risked — the parking level is FDIC-insured and a day away — and the household is several hundred dollars a year better off for having matched money to dates. Income context: at high income this is hygiene; at modest income, the same principle applied to smaller balances still routinely finds $100–300 a year, which is a bill negotiation's worth of value (Negotiating and Eliminating Bills) for even less effort.

Where Plenee fits

Plenee shows every account's balance and role in one view — the map of Mapping Every Account, now with job titles — and flags idle concentrations: cash sitting in throughput accounts far above what your actual computed timing requires. The trough number (Timing Is Everything) sets the checking target; everything above it is visibly underemployed, with its annual cost attached. The decision stays yours; the sorting stops being invisible.