Instead of one monolithic balance sitting in a savings account, structure liquidity in three asymmetric tiers:
One month of deterministic recurring spend in a checking account swept to a Treasury-only money market fund (Fidelity SPAXX is not this — the tax distinction is worked through in section “Consider Taxation”; SNSXX, VUSXX, or FDLXX qualify). Sized for the next four to six weeks of bills, sweepable in seconds.
Six to twenty-four months of deterministic-recurring expense equivalent, held in a rolling four-week T-bill ladder (section “Laddering and Rolling Strategies”) or a Treasury-only MMF. State-tax-exempt under 31 U.S.C. § 3124, available weekly through the maturing ladder, sellable in the secondary market if the whole sleeve is needed at once. This is the layer that absorbs a genuine emergency.
A pre-arranged SBLOC or pledged-asset line against a taxable brokerage account, plus a portfolio-margin facility if you qualify. Undrawn. Costs nothing to maintain, provides seven figures of instant liquidity for an idiosyncratic shock (legal settlement, surprise capital call, time-sensitive opportunity), and avoids a capital-gains liquidation event. Mechanics, pricing, and call-risk caveats are in section “Asset Backed Loans (ABL)”.
The critical asymmetry is that Tier 3 is the wrong layer to draw on during a correlated market drop. SBLOCs and portfolio margin are demand loans collateralized by the same equities that just fell 30%. Drawing on the line at the bottom forces a margin call shortly after (section “Asset Backed Loans (ABL)”); the optionality is real only for shocks that are uncorrelated with markets. The structural rule: in a quiet market, an SBLOC is the first stop for a personal emergency (cheaper after tax than selling); in a drawdown, draw Tier 2 first and leave Tier 3 untouched. This is the same logic that powers the buy-borrow-die treatment in section “Buy, Borrow, Die in Retirement”, applied at emergency-fund scale.
I-bonds sit beside this stack as a long-duration inflation hedge rather than as part of the emergency tiering: a one-year minimum holding period rules them out of Tiers 1 and 2, and the $10,000 annual purchase limit caps their relevance once your fund runs into seven figures. Useful as a complement, not as the fund itself.
FDIC Concentration Above $250K The $250,000-per-depositor FDIC cap binds quickly. For deposit-form Tier 1 and Tier 2 balances, deposit-placement networks — IntraFi’s Insured Cash Sweep (ICS) for liquid balances and CDARS for certificates of deposit — sweep a single large deposit across many member banks in sub-$250,000 tranches, keeping several million fully insured behind one account and one statement (mechanics at section “FDIC Insurance Optimization”). The cleaner solution at this scale is to skip deposits entirely and hold the cash in direct Treasuries or a Treasury-only MMF: backed by the same federal-government counterparty as FDIC, with no per-account cap and no state tax.