Investing and Retirement: 401(k), IRA and the Number You Are Aiming For

If you want to spend about $60,000 a year in retirement beyond what Social Security covers, you need roughly $1,500,000 saved. That is the 4% rule in one line: take the income you want, divide by 4%, and you have your target. Use a more cautious 3.9% and the number climbs to about $1,538,462. You can run your own spending, age, and savings rate in the Retirement Calculator.

That single number hides two smaller questions most people skip. How do you get the money into the right accounts on the way up, and how much can you safely pull out once you stop working. This page walks both, in the order the money actually moves.

The whole thing is three moves

Retirement saving looks complicated because there are three account types (401(k), Traditional IRA, Roth IRA), two tax treatments, and a stack of annual limits. Underneath, the priority order is simple and it rarely changes:

1. Put money in your 401(k) up to the full employer match.
2. Then fund an IRA to the yearly cap.
3. Then go back and fill the 401(k) toward its higher limit.

Each move exists for a plain reason. Do them in order and you capture the highest-return dollar first every time. The order is about return, not loyalty to one account. The match dollar earns an instant 50% before it grows, the IRA dollar earns a better fund menu, and the extra 401(k) dollar still earns the pre-tax break. When money is tight and you can only do one, start at the top and stop wherever your budget runs out. When you have room to do all three, the sequence just makes sure nothing high-value gets left behind.

Move one: capture the full match before anything else

An employer match is the closest thing to free money in personal finance. Your company adds to your 401(k) based on what you put in. The most common formula, according to Vanguard’s How America Saves 2025, is 50 cents on the dollar up to 6% of your pay, and most Vanguard-administered plans offer some match. That report covers Vanguard’s own plans rather than every employer in the country, so treat it as the norm, not a guarantee. Check your own plan document for the exact formula.

Here is the math on a $70,000 salary with a 50%-up-to-6% match. You contribute 6%, which is $4,200 a year, or $350 a month. Your employer adds half of that, $2,100 a year, $175 a month. The moment your money lands, it is worth 50% more. No investment gives you a reliable, instant 50% return. Skip the match and you hand back $2,100 every single year.

There is a second win stacked on top when the 401(k) is the traditional pre-tax kind. Your $4,200 comes out before income tax. If your next dollar is taxed at the 22% federal rate, that contribution trims your federal tax bill by about $924 for the year. So you moved $4,200 into your future, your employer added $2,100, and the government effectively chipped in $924 of tax you did not pay. Those are 2026 federal figures, the same ones the Retirement Calculator and the tax calculators here use, and the IRS resets them each year.

Move two: fund an IRA for the better menu

Once the match is captured, the next dollar usually does better in an IRA than back in the 401(k). Not because of tax, the tax treatment can be identical, but because of choice. Many 401(k) plans give you a short list of funds, some with high fees baked in. An IRA at a low-cost broker opens the whole market of index funds, often at a fraction of the expense ratio. Over 30 years, a half-percent difference in fees quietly eats a real slice of the balance.

The 2026 IRA limit is $7,500 across Traditional and Roth combined, up from $7,000 in 2025, per IRS IR-2025-111 (November 13, 2025). If you are 50 or older you can add a $1,100 catch-up, for $8,600. That cap is shared. Put $7,500 in a Roth and you have nothing left for a Traditional the same year.

Move three: fill the 401(k) toward the cap

After the IRA is full, come back to the 401(k) and push toward its ceiling. For 2026 the employee limit is $24,500, up from $23,500 in 2025. Age 50 and over get an $8,000 catch-up, so $32,500. A SECURE 2.0 provision gives ages 60 through 63 a larger $11,250 catch-up instead of $8,000. All four figures are from IRS IR-2025-111.

There is a separate, much higher ceiling on everything that can land in a 401(k) in one year, your money plus the employer’s, called the annual additions limit. It is widely reported around $72,000 for 2026, up from a verified $70,000 in 2025, though we could not confirm the 2026 figure against the IRS notice directly, so treat it as reported rather than settled. Most people never approach it. It matters mainly for high earners using after-tax contributions.

Roth or Traditional: bet on your tax rate

The choice between Roth and Traditional is one decision, and it turns on a single question: is your tax rate higher now, or will it be higher in retirement?

• Traditional deducts the contribution now and taxes the withdrawal later. You win if your rate in retirement is lower than it is today. This suits high earners in their peak years.
• Roth takes the tax now and the withdrawals come out tax-free forever. You win if your rate later is higher, or equal, or if you just value knowing the balance is truly yours with no tax bill attached. This suits younger savers early in their earnings and anyone who expects rates to rise.

Two income limits shape the choice. Roth IRA eligibility phases out at higher incomes, and the deduction on a Traditional IRA phases out when you are also covered by a workplace plan. For 2026 that Traditional-IRA deduction phase-out runs $81,000 to $91,000 for a single filer covered at work, and $129,000 to $149,000 for a married couple filing jointly where the contributor is covered, per IRS IR-2025-111. Above the top of the range the deduction disappears, though you can still contribute.

A quick way to feel the trade-off: say you can set aside $6,000 of take-home money this year and both accounts grow at 7% for 30 years. In a Roth you invest the full $6,000 after tax and every dollar of the roughly $45,700 it becomes is yours to spend. In a Traditional you can afford to put in more up front because the deduction refunds part of the cost, but the whole ending balance gets taxed on the way out. If your tax rate is the same at both ends, the two land in the same place. The Roth only pulls ahead if your rate later is higher, and the Traditional only pulls ahead if your rate later is lower. That is the entire decision, stripped down.

There is no universally correct answer. Many people split the difference on purpose, holding some Traditional and some Roth, so they have a tax dial to turn in retirement rather than one fixed outcome. Holding both also hedges the thing nobody can predict, which is where tax rates go over the next few decades.

Why the order matters: compounding does the heavy lifting

The reason to start early and capture the match is that time, not contribution size, is what builds the balance. Watch what $500 a month at a 7% average annual return turns into over 40 years, and what the same $500 becomes when a 50% employer match rides alongside it (another $250 a month).

Two things stand out. First, the curve is nearly flat for years and then bends sharply upward late, which is compounding at work. You put in $240,000 of your own money across those 40 years, and it grows to about $1,312,407. The gains, roughly $1,072,407, dwarf what you contributed. Second, the match is not a small bonus. Adding $250 a month lifts the finish to about $1,968,610, a difference of $656,203 over a lifetime, from money your employer offered you the whole time. The Retirement Calculator lets you swap in your own contribution, match, and years to see your version of this curve. If the shape of that late upswing surprises you, the companion piece how compounding actually works shows the mechanism step by step.

The number, and the story behind 4%

Now the other half: how much you can safely take out. The famous answer is 4%, and it has a real history worth knowing before you lean on it.

In October 1994, financial planner William Bengen published “Determining Withdrawal Rates Using Historical Data” in the Journal of Financial Planning. He ran a portfolio of 50% to 75% stocks through every 30-year window in the 1926 to 1992 record and asked how much a retiree could withdraw in year one, then raise with inflation each year after, without running out. The worst-case survivor, what he called SAFEMAX, came in around 4.15%. Round it down and you get the 4% rule.

Four years later, three professors at Trinity University, Cooley, Hubbard and Walz, reframed the question as odds. Their 1998 study found a 4% withdrawal succeeded about 95% of the time over 30 years using 1926 to 1995 data. That “probability of success” framing is what turned a planner’s rule of thumb into the number everyone quotes.

The flip side of 4% is the 25x rule, and it is just the same math turned around. One divided by 0.04 is 25, so a 4% withdrawal means you need 25 times your annual spending saved. That is exactly the $1,500,000 target at the top of this page for $60,000 of spending. The FIRE movement (Financial Independence, Retire Early) built its whole “number” on this inversion.

Why researchers have trimmed 4% toward 3.9%

Here is the part the headlines skip. The 4% rule is not fixed, and the current research pulls in two directions at once.

Morningstar’s recent State of Retirement Income work puts the safe starting rate for fixed, inflation-adjusted spending at about 3.9% for a 30-year retirement at a 90% success target, up from 3.7% in their prior report. Their case for a number below 4% is lower expected returns going forward than the last century delivered. On the same $60,000 of spending, 3.9% raises the target to about $1,538,462, roughly $38,462 more to save than the classic 4% implies. The exact calendar year each Morningstar figure maps to is genuinely muddy across secondary sources, so read 3.9% as the current number and 3.7% as the one just before it.

Pulling the other way: Morningstar also finds that a flexible “guardrails” approach, where you trim spending in bad market years and let it rise in good ones, can start near 5.7%. At 5.7% the same $60,000 needs only about $1,052,632. And Bengen himself, in later research with a broader mix of assets, concluded that his original 4.15% was too conservative and that a somewhat higher starting rate held up.

The takeaway is a range, not one fixed number. Depending on your flexibility, your time horizon, and how much you hold in stocks, a defensible starting withdrawal rate sits somewhere between about 3.5% and 4.5% for a fixed withdrawal, and higher if you use the flexible guardrails above. The single biggest lever inside that range is whether you are willing to cut spending in a down market. That willingness is what separates the roughly $1,052,632 target from the $1,500,000 one.

One more adjustment for early retirees. Bengen and Trinity both studied a 30-year retirement. If you plan to stop at 45 and fund a 45 or 50-year horizon, 4% is too aggressive, because there are far more years for a bad sequence to do damage. Lean nearer 3% to 3.5% and add more cushion. The deeper walk-through on how much you actually need to retire works several horizons and spending levels.

One forward note on 2026 numbers

The contribution limits above are the confirmed 2026 IRS figures. The tax savings math earlier, the 22% bracket and the standard deduction, uses 2026 federal figures because that is what the calculator computes with today. Social Security has its own moving part: the taxable wage base rises to $184,500 in 2026 from $176,100 in 2025, on a 2.8% cost-of-living adjustment, per the SSA. The take-home tools now run 2026 figures, so the calculator uses that $184,500 base.

The caveat. These are estimates built from published figures, not a plan for your specific situation. The 4% rule is a starting-withdrawal guideline for a 30-year retirement with yearly inflation raises, not “4% of your balance every year.” The growth curve assumes a steady 7% return, and real markets never move in a straight line. None of it accounts for Social Security income, pensions, taxes on withdrawals, healthcare costs, or a market crash in your first few retirement years, which is the single biggest risk to any withdrawal plan. Use the numbers to aim, then adjust as real life comes in.

Where this fits

The three-move flow gets money into the right accounts in the right order. The 4% and 25x math tells you when you have enough. Between them sits one more truth: high-interest debt undoes all of it, because no 7% return beats a 22% credit card. If that is you, clear the expensive debt first. The companion guide to getting out of debt lays out the order.

Run your own age, savings rate, employer match, and target spending in the Retirement Calculator to see your number and the year you reach it.

Common questions

Should I really pass up the match to pay off debt first? Almost never pass up the full match. A 50% match is an instant 50% return, which beats even credit-card interest. Capture the match, then direct everything else to high-rate debt before adding beyond it.

Roth or Traditional if I truly cannot decide? Split it, or lean Roth when you are young and in a low bracket. Younger earners usually have their lowest lifetime tax rate now, which is exactly when paying the tax up front for tax-free growth pays off most.

Is 25 times my spending enough to retire on? It is the classic target and a solid starting point for a 30-year retirement. If you are retiring early with a 40-plus year horizon, or you want more safety, aim closer to 28 to 33 times, which matches a 3% to 3.5% withdrawal rate.

What return should I assume? A 7% average annual return, roughly the long-run stock-market average after some bond mix, is a common planning figure. It is an average across decades, not a promise for any single year, and returns going forward may be lower, which is part of why researchers trimmed the safe withdrawal rate below 4%.