You're probably saving in the wrong account first

The Blueprint · Issue #5

Apr 16, 2026 · 9 min read

Published: Wednesday, April 16, 2026 Series: The Blueprint | Practical Investing Guides

Marcus has been putting $500 a month into his taxable brokerage account for the last three years. The one he opened during COVID, when everyone was suddenly paying attention to markets and it felt irresponsible not to have one. He's disciplined about it. He transfers the money on the first of the month, every month. The balance is almost $20,000 now, and it makes him feel like he's doing the right thing.

He also has a 401(k) at work. He contributes 4%, just enough to get the employer match. And he has a Roth IRA that he opened five years ago, during another wave of financial motivation, and deposited exactly $2,200 into. It's been sitting there since. He keeps meaning to fund it.

The thing nobody has ever told Marcus is that the account you save in matters almost as much as how much you save. Not because of investment returns. Because of taxes. Three accounts. Three completely different tax treatments. One of them is costing him thousands of dollars a year in foregone growth, and he's been prioritizing it.

Three buckets, three completely different tax bills

Before the waterfall makes sense, you need to understand the containers.

Tax-deferred accounts are the 401(k) and Traditional IRA. You contribute money before income tax — the government doesn't touch it yet. It grows for decades untaxed. Then you pull it out in retirement, and you pay income tax on everything you withdraw. The tax bill is real; it's just deferred to a future version of you.

Tax-free accounts are the Roth 401(k) and Roth IRA. You contribute money after income tax — you've already paid. It grows for decades untaxed. When you pull it out in retirement, you owe nothing. Not on the original contribution, not on the growth, not on any of it. It's genuinely untaxed forever.

Taxable brokerage accounts are what's left. You contribute after-tax money. Every year, dividends and interest create a taxable income event. Every time you sell something that's gone up, you owe capital gains taxes. When you retire and start withdrawing, you pay taxes again on the gains. You are taxed at every stage.

Put $10,000 in each of these three accounts, assume identical returns, and 20 years later you have three different balances. Same market. Same fund. Different container. The container is the decision.

The waterfall

There's an order that makes mathematical sense. Most people don't know it, and most people are saving in reverse.

Step one: 401(k) up to the employer match

Whatever percentage your employer matches, contribute at least that much. This is the only guaranteed instant return on your money that exists outside of a con. If your employer matches 50 cents on every dollar up to 6% of salary, contributing 3% and stopping there means you're leaving 3 points of free salary in the plan every year.

Do this before anything else. No argument.

Step two: HSA, if you have one

If your health insurance is a high-deductible plan, you're eligible for a Health Savings Account. The tax treatment is the most aggressive in the US tax code: contributions are deductible, growth is tax-free, and withdrawals for medical expenses are also tax-free. Triple tax advantage. After age 65, it functions like a Traditional IRA for non-medical expenses.

If you have it, fund it before Step three. If you don't, skip ahead.

Step three: IRA up to the annual limit

This is the step Marcus has been skipping. The annual limit for 2026 is $7,500 (up from $7,000 in 2025). Whether it's a Roth or Traditional IRA depends on your income and tax situation — that's Issue #6. For now: the IRA deserves priority over a taxable account because the growth inside it doesn't get taxed every year. Every dollar of dividends in a Roth IRA stays in the account and keeps compounding. Every dollar of dividends in a taxable account produces a tax bill in April.

Fill this before you put more money in a regular brokerage.

Step four: 401(k) up to the full annual limit

After the IRA is funded, continue into the 401(k) up to the 2026 limit of $24,500. This continues using tax-advantaged space before routing money to the least efficient account.

Step five: Taxable brokerage

Only after you've exhausted the options above. The taxable account has real uses — it's more flexible, no contribution limits, no required withdrawal schedules. But as a primary savings vehicle, while tax-advantaged space sits unfilled, it's the wrong bucket.

What the ordering actually costs

Here's what Marcus's situation looks like in numbers.

He's 48. He has $7,500 a year he can put somewhere. For the last three years, all of it has gone to his taxable account. His IRA has $2,200 in it.

Run two versions of the same $7,500/year forward 20 years — him retiring at 68.

Version A: Roth IRA, $7,500/year at 7% annual return

Year 5: $43,130
Year 10: $103,623
Year 20: $307,466

Withdrawal at 68: $307,466. Tax owed: $0. Roth withdrawals are tax-free.

Version B: Taxable brokerage, $7,500/year at 6.5% effective return

The 0.5% rate reduction is the annual tax drag: dividends taxed as income every year, capital gains distributions from fund rebalancing, reinvested gains that get taxed again. A conservative estimate for a diversified portfolio.

Year 5: $42,703
Year 10: $101,209
Year 20: $291,190

At withdrawal, he owes capital gains tax on his gains. He put in $7,500 × 20 = $150,000. The $141,190 in gains gets taxed at the long-term rate, 15%. That's $21,179 to the IRS.

After-tax take-home at 68: $270,011.

The difference between Version A and Version B: $37,455.

Look at what happens in the early years — $427 difference at Year 5, $2,414 at Year 10. Small. Easy to ignore. Then compounding runs for another decade and the gap becomes $37,000. The mechanism is exactly the one from Issue #4: fees compound the same way returns do. So does tax drag.

The part that should bother Marcus

He had $7,500 a year of Roth IRA capacity sitting unused. For at least five years, he's known in the back of his mind that he should fund the IRA. He's been meaning to. The money has gone somewhere else instead.

That's not a judgment. Most people do this. The 401(k) has automatic contributions. The brokerage account has an app with a nice interface. The IRA requires a decision. It requires knowing whether to do Roth or Traditional, knowing the limit, knowing the deadline. The friction is just slightly higher, and so it sits.

But the cost of leaving it unfunded is quiet, consistent, and compounding. Every year the IRA is unfunded, the gap widens. Not dramatically. The Year 5 difference is a couple hundred dollars. By Year 20 it's a new car.

One thing to know before you act

The Roth IRA has income limits. In 2026, contributions begin to phase out at $153,000 for single filers and $242,000 for married couples filing jointly. They phase out completely at $168,000 and $252,000 respectively.

If you're above that, the Roth IRA isn't available the standard way. There are options — Traditional IRA, backdoor Roth — but those belong in Issue #6, which covers the Roth vs. Traditional decision in full. For now: if you're under those thresholds, the Roth IRA is available to you and should be on the list.

One action this week

First: What percentage are you contributing? Does it reach your employer's full match threshold? If not, increase it. This week. The employer match is the highest guaranteed return in the waterfall. Anything left on the table is gone.

Second: Do you have an IRA? Check the current year contribution. The deadline to contribute for 2026 is April 15, 2027, so you have time. But the earlier you put money in, the more compounding time it has.

Third: Is money going to a taxable brokerage account while your IRA is unfunded? If yes, you've found the reorder. Same dollars. Better bucket.

You don't have to move anything today. Know the three answers.

Next Wednesday: Inside every 401(k) and IRA, you face the same choice: Traditional or Roth. It looks like a tax form question. It's actually a bet on whether your taxes will be higher now or in retirement. Here's how to think through which side of that bet makes sense for you.

The Blueprint is a Wednesday series covering the fundamentals of long-term investing: one concept at a time, in plain language, with real numbers.

The Blueprint is for informational and educational purposes only. Nothing here is investment advice. All figures are estimates based on assumed returns and tax rates; your results will differ based on your actual situation. Consult a qualified financial professional before making decisions about your retirement accounts.