The Waterfall

Nine steps · where each dollar goes

Money fills the first bucket. When that one is full, the overflow runs to the next. You never skip a bucket, and you never pour into a lower one while a higher one still has room. Tap a step to open it.

Cover the Deductible Keep enough cash to pay your single largest insurance deductible.
The short version. Find the biggest deductible you carry, health, car or house, and park that much in a savings account you can reach tomorrow. Not all of them added up. Just the largest one.

The full picture

This is the smallest step and the one that stops the most damage. The first bad day of the year, a fender bender, a trip to the ER, a tree through the roof, comes with a bill equal to your deductible before insurance pays a cent. Without this money in cash, that bill lands on a credit card, and you are suddenly working on step three before you ever got started.

It sits in plain savings, not invested, because you might need it next week. It is also the first slice of the emergency fund you will build in step four, so nothing here is wasted.

Done when cash in savings equals your highest deductible

Questions

  • Which deductible, if I have several?The single biggest one. Two things rarely break in the same month, and the emergency fund in step four covers the rare case they do.
  • My health plan has a huge deductible. Does that change anything?Then that is your number, and it is the reason a high-deductible plan comes with an HSA in step five. The cash still comes first.
  • Can it earn interest?High-yield savings is fine. Anything that can lose value or take days to sell is not.
Take the Free Money Put in enough at work to collect every dollar your employer will match.
The short version. If your employer matches retirement contributions, contribute exactly enough to get all of it. A match is a 50% or 100% return the day it lands, and nothing else on this list pays that.

The full picture

This sits above paying off credit cards on purpose. A card might charge twenty-some percent a year. A dollar-for-dollar match pays 100% instantly, and even a half match pays 50%. You will never beat that anywhere else, so it goes first.

Check the vesting schedule. Your own contributions are always yours, but the employer's share may become yours over a few years, and leaving early forfeits the unvested part. Know the date before you make plans around it.

A discounted employee stock purchase plan counts here too, as long as you sell the shares promptly and do not let company stock pile up.

Done when you are contributing enough to receive the full match

Questions

  • I have credit card debt. Really take the match first?Yes. A 100% return beats a 25% interest rate. Just the match, though, not a penny more, until step three is finished.
  • How do I know what the match is?The plan summary says something like "50% of the first 6%." That means put in 6% of your pay and the company adds 3%. Contribute less than 6% and you leave some of it on the table.
  • No plan, or no match?Skip straight to step three. There is nothing to collect.
  • Roth 401(k) or traditional for the match part?Either. The match itself lands pre-tax regardless of which side you choose for your own money.
Kill the Expensive Debt Pay off every debt that costs more than your investments could reasonably earn.
The short version. Credit cards, consumer loans, and car loans that broke the 20/3/8 rule all go here, along with student loans above the cutoff for your age. The mortgage does not. Nothing beyond the match gets invested until this is gone.

The full picture

Every dollar of expensive debt is a guaranteed loss at that rate. Paying off a 22% card is the same as earning 22%, risk free, tax free. No investment offers that, which is why this outranks everything below it.

What counts. Credit cards and personal loans, always. Car loans that fail 20/3/8: twenty percent down, paid off in three years or less, all car payments together under eight percent of gross income. A zero-percent promotional card counts too, because the rate is sleeping, not gone. Student loans count by your age: in your 20s anything over 6%, in your 30s over 5%, in your 40s over 4%, and at 50 or older all of them.

What does not. The mortgage. The house tends to appreciate, the interest may be deductible, and the rate is usually the lowest you will ever borrow at. It waits for step nine.

Which order. Highest rate first saves the most money. Smallest balance first gives you a win fastest. Pick the one you will actually finish.

Done when no expensive balance remains

Questions

  • Should I pause the 401(k) to do this faster?Pause everything above the match. Keep the match, since that is step two and it pays more than the debt costs.
  • My car loan is 3.9%. Is that expensive?If you put twenty percent down, the term is three years or less, and the payment is under eight percent of gross income, it is fine to keep. Miss any of those three and it belongs here.
  • The card is at 0% for 18 months.It still counts. Promotional rates end, and balances that were supposed to be paid off by then usually are not.
  • Avalanche or snowball?The avalanche, highest rate first, is the math. The snowball, smallest balance first, is the psychology. Both work if you finish.
Build the Cushion Set aside three to six months of what you spend, in savings.
The short version. Three to six months of expenses, not income, in a high-yield savings account. One income in the house or an unpredictable job argues for six or more. The deductible money from step one is part of this total.

The full picture

This is the money that keeps a job loss, a dead furnace, or a slow month from undoing steps two and three. Without it, the first real setback goes back on a card and you slide down the waterfall.

Size it on what it costs to keep the household running, mortgage or rent, utilities, food, insurance, minimum payments, gas, and nothing else. That is the number to multiply, not your salary.

  • Three months if two stable incomes come into the house.
  • Six months if one income, or a job that is commission, contract, or seasonal.
  • Nine to twelve if you own the business, work in a narrow field, or would take a long time to replace your job.
Done when three to six months of expenses sit in savings

Questions

  • Where should it live?High-yield savings or a money market fund. Boring on purpose. It is insurance, not an investment.
  • Does the step one money count?Yes. The deductible cash is the first slice of this fund, not a separate pile.
  • Six months feels like a lot of cash doing nothing.It is doing something. It is what lets the rest of your money stay invested through a bad year instead of being sold at the bottom.
  • Expenses went up. Do I top it up?Yes, once a year is enough. Recheck when rent, a child, or a car changes the monthly number.
Fill the Tax-Free Accounts Max out the Roth IRA and, if you can, the HSA.
The short version. The Roth grows and pays out with no tax ever again. The HSA is better still, with three tax breaks instead of two. Fill both to the yearly limit before going back to the 401(k). Over the income limit for a Roth, use the backdoor.

The full picture

A Roth IRA takes money you already paid tax on and never taxes it again, not the growth and not the withdrawals. It is also the most flexible retirement account there is: your contributions, not the earnings, can come back out at any age without penalty, which makes it a quiet second emergency fund.

A Health Savings Account needs a high-deductible health plan, and if you have one it is the best account in the tax code. Contributions are deductible, growth is tax-free, and withdrawals for medical costs are tax-free. After 65, anything left can be spent on anything at all, taxed like a regular IRA with no penalty. Pay small medical bills out of pocket now, keep the receipts, and let it grow.

The yearly limits for 2026 are $7,500 for a Roth IRA and $4,400 self-only or $8,750 family for an HSA, with extra room past 50 and 55 respectively.

Done when both are maxed for the year, or you are not eligible

Questions

  • Why the Roth before maxing the 401(k)?More flexibility, more fund choices, lower costs, and a tax-free bucket to draw from later so every retirement dollar is not taxed as income.
  • I make too much for a Roth.Contribute to a traditional IRA with no deduction and convert it, the backdoor Roth. Be careful if you already hold pre-tax IRA money, since the conversion is taxed pro-rata across all of it.
  • Should I use the HSA for this year's doctor bills?Only if you have to. Paying out of pocket and letting the HSA grow is the move. Save the receipts; you can reimburse yourself decades later.
  • Married. Two Roths?Yes, one each, as long as there is enough earned income between you to cover both.
Fill the Work Plan Take the 401(k) all the way to the yearly cap.
The short version. Go back to the 401(k), 403(b) or 457 and raise contributions to the IRS limit, $24,500 for 2026 if you are under 50. If the plan allows after-tax contributions, the mega backdoor Roth lets you go further. Already investing 25% of income? You may skip ahead.

The full picture

With the match, the debt, the cushion and the tax-free accounts handled, the work plan is the biggest tax-advantaged space you have left. Every dollar in it either skips tax now or skips tax later, and it is deducted from your paycheck before you can spend it, which is half the reason it works.

Your own contributions are capped by the IRS each year. The employer's match does not count against that cap. Past 50 you get an extra catch-up amount, and from 60 to 63 a larger one.

Some plans allow after-tax contributions above the normal cap that can be converted to Roth inside the plan. That is the mega backdoor Roth, and if your plan has it, it is the largest Roth space most people will ever see.

Done when the plan is maxed, or you already invest 25% of gross income

Questions

  • Roth 401(k) or traditional?Both count against the same cap. A lower tax bracket today argues for Roth, a high one for traditional. Many people split.
  • What is the 25% shortcut?High earners can reach a 25% savings rate before the plan is maxed. If you are already there, this step is optional and you may move to step seven.
  • How do I know if my plan has the mega backdoor?Ask HR two questions: does the plan allow after-tax contributions, and does it allow in-plan Roth conversions or in-service withdrawals. It needs both.
Twenty-Five Percent Get total retirement investing to a quarter of gross income.
The short version. Across every account you have, work plan, Roth, HSA and a plain brokerage account, invest at least 25% of what you earn before tax. Started late or leaving early, the number is higher. Steps six and seven usually run together.

The full picture

Pensions are gone for most people and Social Security replaces only part of a paycheck. A quarter of gross income, invested for decades, is what replaces them. It is the rate that turns a good income into an independent one.

Once the tax-advantaged accounts are full, the rest goes into a regular brokerage account in low-cost index funds. It is not as tax-friendly, but it is completely flexible, and it is the account that funds a retirement before 59.5.

Done when 25% or more is going in and your plan says you are on pace

Questions

  • Gross or take-home?Gross. Before tax, before anything comes out.
  • Does the employer match count toward the 25%?Count it if you want to be kind to yourself. Leave it out if you want to retire early. The strict version is the one that gets there.
  • 25% is not possible right now.It is a target, not a starting line. Raise it a point with every raise and you will be surprised how quickly it arrives.
  • Where does money go after the accounts are maxed?A taxable brokerage account, in broad index funds. Boring, cheap, and reachable at any age.
Pay Ahead Fund the big planned costs, college first, once your own future is set.
The short version. College through a 529 or a custodial account, a Roth for a kid with earned income, the second home, the big trip. No set amount. The only rule is that it comes after your retirement is on solid ground, because they can borrow for school and you cannot borrow for retirement.

The full picture

This is where the money for other people and other plans lives. It sits this far down not because it matters less, but because a parent who funded college and not retirement becomes the child's expense later, which is the opposite of the gift they meant to give.

For education, a 529 grows tax-free for school costs, often earns a state tax break, and stays in your name and control. A custodial account is more flexible in what it can be spent on but becomes the child's outright at adulthood. A child with real earned income can have a Roth IRA of their own, and a few thousand dollars at sixteen is a remarkable thing by sixty.

Done when the goals you set here are funded on the timeline you chose

Questions

  • How much for college?There is no rule. Decide what share you intend to cover, price it, and save toward that. Covering some is a gift. Covering all is optional.
  • 529 or custodial?529 if it is for school, for the tax break and the control. Custodial if you want no strings on how it is used and can accept that it is theirs at 18 or 21.
  • What else belongs here?Anything big and planned: a wedding, a sabbatical, a boat, a down payment on a second place. If it has a date and a price, it is a step eight goal.
Own It Outright Clear the cheap debt so nothing is owed by the day you retire.
The short version. Last of all, pay off the mortgage and any student loans that were too cheap for step three. The target is no payments of any kind on the day you stop working.

The full picture

Cheap debt goes last because it costs less than the market tends to earn, so every dollar that went ahead of it did more good. But a retirement with no mortgage is a retirement that needs far less income, and that lowers the number you need on every page of this site.

By this step you are already investing a quarter of your income and the big goals are funded. Extra dollars now go against the principal. Aim to arrive at retirement owing nothing to anyone.

Done when you owe nothing

Questions

  • Pay the mortgage early or invest more?If you are here, you are already investing 25%. That question was settled in step seven. Now the extra goes to the house.
  • Should I refinance instead?If it lowers the rate without resetting a 30-year clock you were halfway through, yes. Otherwise keep paying down the one you have.
  • Low-rate student loans?Same bucket. They were too cheap to be urgent in step three and they get cleared here.

Three rules that sit under all nine

Money just landed? Tell me what to do with my money An inheritance, a sale, a tax refund, a bonus. Enter the amount, answer a few questions, and watch it run down the waterfall one bucket at a time. Open the calculator →