New on FinoLib · Volume V: Personal Finance
My latest article is now live on FinoLib, the free finance library I write: Financial Order of Operations: Where the Next Dollar Should Go, from Volume V: Personal Finance. It is part 1 of a 2-part guide. Read the summary below for the substance of the topic, then continue to FinoLib for the complete treatment.
The idea in plain words
Picture your money filling a row of buckets, where each bucket must be full before the next one gets any water. First pay your bills and loan minimums. Then keep a small cash cushion. Next collect any free money your employer offers, because a match is an instant reward. After that, clear expensive debt, build a full emergency fund, and only then fill your retirement and health accounts. The order works because a sure gain beats a hoped-for one, and paying off costly debt is a guaranteed return.
Key points
■Paying off a 20% card earns a certain 20%; the 7% expected from stocks is an assumption, not a promise, and is taxed outside retirement accounts.
■In the 22% bracket, a debt would need to cost about 50% a year to beat a 50% employer match.
■Compare debts after tax: a fully deductible 6.52% student loan costs 6.52% × (1 − 0.22) = 5.09%.
■Against a taxable index fund expected to earn 7%, with gains taxed at 15%, the five-year break-even debt rate is about 6.06%.
A closer look
Every Part of this volume makes a good case for its own priority: the emergency fund, the employer match, paying off cards, the HSA, the IRA. A household with a limited savings share needs a sequence, not nine simultaneous goals. The order below is the one this volume uses throughout; where 1.4, 6.5 or Case One (14.2) mention a sequence, this table is the reference. It is a heuristic built on one idea — send each dollar where its guaranteed or most certain return is highest, while protecting the household from being forced into expensive debt along the way.
The debt step, in numbers. Paying off a debt “earns” its interest rate, guaranteed and untaxed: every dollar that retires a 20% card saves 20 cents a year with certainty. Investing that dollar instead might earn the 7% long-run average this volume assumes for stocks (Parts 6 and 7), before tax, with no guarantee in any given year. Credit cards (about 21%–22% on average in the Federal Reserve’s Sep 8, 2026 release, 3.3) and payday loans (often 300%+) therefore belong ahead of investing beyond the match. Debt at roughly 5%–8% — many car loans, 2026–27 undergraduate federal loans at 6.52% — is a judgment call: the expected gain from investing is small and uncertain, so paying it down sits comfortably in step 9 or alongside steps 6–8.
A worked example
Worked Example — Compare the Scenarios: Prepay a 6.52% Loan, Invest in a Taxable Account, or Fund a Roth IRA
The running household has $10,000 and five years. Illustrative assumptions: stocks earn 7% a year (Parts 6 and 7; not a promise); gains in a taxable account are taxed once, at 15%, when sold (its 2026 long-term rate, since taxable income of $51,800 is above the $49,450 top of the 0% band); prepaying the federal loan saves 6.52% a year, compounded, because every dollar no longer owed stops growing at that rate. Choice Formula After 5 years Annual rate Risk A. Prepay the 6.52% loan (interest not deducted) $10,000 × 1.0652^5 $13,713.74 6.52% None A′. The same loan, interest fully deducted $10,000 × (1 + 0.0652 × 0.78)^5 $12,814.92 5.09% None B.
Under the hood
Under the Hood: Why Prepaying Debt Is a Guaranteed, After-Tax Return
A dollar that retires debt cancels an interest charge for as long as the debt would have run. Its “return” is the interest rate, with no market risk and, for debt whose interest is not deductible (credit cards, car loans), no tax. An investment’s return is uncertain and, outside retirement accounts, taxed. A fair comparison therefore puts both sides after tax, and sets risky returns against riskless ones: After-tax cost of a debt = rate × (1 − marginal tax rate) when the interest is deductible, otherwise the rate itself.
What the full article covers
The full article includes worked examples, a look under the hood at the mechanics, a recap, a reveal-on-click quiz and the official sources behind every figure.
Volume V: Personal Finance
Read the full article on FinoLib
The complete article, Financial Order of Operations: Where the Next Dollar Should Go, with every worked example, diagram, quiz and source, is free to read in Volume V, Personal Finance on finolib.com.
Explore the Finance Education Series: Vol. II — Capital Markets · Vol. I — Global Economy · Vol. III — Finance Encyclopedia · Vol. IV — Finance Careers · Vol. V — Personal Finance