Cash
Size a 3–12 month emergency fund from essential expenses, job risk, and high-yield savings. Includes a calculator and when not to over-save.
Updated 2026-09-08 · 8 min read
An emergency fund is insurance against a lost job, a medical deductible, or a dead transmission. It is not a travel fund and it is not 'three months of whatever you spent last quarter.'
Add the bills you would still have if you cut dining, subscriptions, and hobbies tomorrow: rent or PITI, groceries, utilities, insurance, minimum debt payments, commuting, childcare. That monthly number times your runway is the target.
If you have a partner with independent income, you can sit closer to three months. If you are self-employed, work a cyclical industry, or support others, six to twelve is more honest.
Park it in an FDIC-insured high-yield savings account or a Treasury money-market fund you can sell same-day. CDs and brokered products that lock the money for a year fail the 'Tuesday' test. Dated cash that can sit 1–5 years is the I-bond vs T-bill vs HYSA calculator, not this sleeve.
Yields move with the Fed. Do not hop banks every week for 10 extra basis points if it costs you automatic transfers. Automatic is how the fund actually gets built.
Known, repeating costs belong in sinking funds: car insurance, holidays, new tires, annual IRS bills. Raiding the emergency fund for Christmas is how people end up putting a layoff on a credit card.
Once you refill after a real emergency, treat the refill like a bill until you are back at target.
Run the numbers: emergency fund calculator (size) · I-bond vs T-bill vs HYSA (where leftover dated cash sits).
Three months of *essentials* (housing, food, utilities, insurance, minimum debt, transport) is a floor for dual-income households with stable jobs. Single earners, commission, or contractors usually want 6–12 months.
No. The job of this pile is to be there on a Tuesday. Use a high-yield savings account or Treasury-backed money market. Sequence risk is the whole point of keeping it boring.
Keep a small cash buffer (one month of essentials) so a surprise does not go on the card, then throw extra at high-APR debt. A full six-month fund while carrying 28% interest is usually too expensive.
Educational only. Verify IRS limits and loan quotes before acting.