72(t) on a $600K IRA: Which Method Pays $26K vs $17K

Daniel is 50, single, and lives in Austin, Texas. He just left a software job and wants to retire early on a $600,000 traditional IRA without paying the 10% early-withdrawal penalty that normally applies before age 59½. His only penalty-free door is IRC §72(t) — a series of substantially equal periodic payments (SEPP). The first decision he makes will set his income for nearly a decade: which of the three IRS-approved calculation methods to use.

If Daniel picks the amortization method at a 2.6% rate, his IRA pays him about $26,000 a year, fixed, every year until age 59½. If he picks the required-minimum-distribution (RMD) method, it pays about $16,575 the first year and recalculates annually. Same balance, same age, same tax code — a roughly $9,400 swing in year-one income, driven by nothing but the formula he chooses before his first check clears.

The three IRS methods, and why they pay so differently

Rev. Rul. 2002-62 and IRS Notice 2022-6 authorize exactly three ways to compute a 72(t) payment. All three start from the same account balance and the same life-expectancy tables. What changes is whether the payment is fixed for the life of the plan or recalculated each year.

1. RMD method. Divide the prior-year-end balance by the life-expectancy divisor for your age. Recalculate every year. The payment floats with the account — it falls in a down market and rises in an up market. Lowest first-year payout of the three.
2. Amortization method. Amortize the balance over your life expectancy at a fixed interest rate (the 120% federal mid-term rate). Produces one level payment that never changes for the entire schedule. Highest, most predictable payout.
3. Annuitization method. Divide the balance by an annuity factor built from the same interest rate and an IRS mortality table. Also fixed for the life of the plan. Lands within a few hundred dollars of the amortization figure in almost every case.

The two fixed methods pay more because they front-load: they assume your account earns the assumed interest rate (here, up to 5%) and pay you that return plus a slice of principal each year. The RMD method makes no return assumption — it just divides by a divisor — so it pays out more conservatively.

Daniel’s numbers, side by side

Daniel uses his single-life expectancy divisor of 36.2 at age 50 (IRS Single Life Table, 26 CFR §1.401(a)(9)-9, updated 2022). For the two fixed methods he uses a 120% federal mid-term rate of 2.6% — below the 5% ceiling set by Notice 2022-6, and within the band published in a moderate-rate environment. Here is what each method pays him on the $600,000 balance:

The headline gap is the amortization method’s $25,780 against the RMD method’s $16,575 — roughly $26K versus $17K, a 56% difference in spendable income from the same account. Push the rate to the 5% ceiling and the amortization payment climbs toward $36,000; drop it to 1% and it falls near $20,000. The rate is the single biggest lever inside the two fixed methods, and you choose it once.

Why the RMD figure moves and the others don’t

If Daniel’s IRA grows to $640,000 by next year-end, his RMD-method payment recalculates against the new age-51 divisor (35.3) and a larger balance — it rises. If the account drops to $540,000 in a bad year, the RMD payment falls automatically. That self-adjusting behavior is the RMD method’s core feature: it can never force you to drain the account faster than it can sustain, because the payment shrinks with the balance. The amortization and annuitization payments do the opposite — they are contractually level, so in a 30% market drop a fixed $25,780 becomes a far larger bite of a shrunken account.

The 5-year / 59½ lock — the part that ruins people

A 72(t) schedule is not a faucet you adjust. Once Daniel takes his first payment, he must take exactly the computed amount — no more, no less — for the longer of five years or until age 59½. At 50, that means he is locked until age 59½, about 9.5 years. A 57-year-old would be locked the full five years, to age 62, because five years runs past 59½.

Break the schedule and the consequence is brutal and retroactive. Under IRC §72(t)(4), any modification before the lock ends triggers the 10% early-withdrawal penalty on every distribution you ever took under the plan — not just the offending one — plus interest from each year. A 72(t) “busts” if you:

• Take more or less than the exact calculated amount in any year
• Add money to or roll over the IRA the schedule is computed on
• Take an extra, unscheduled withdrawal from that same IRA
• Stop the payments before the lock period ends

On Daniel’s plan, busting in year 6 after pulling $25,780 annually would expose roughly $154,000 of cumulative distributions to a 10% penalty — about $15,400 — plus interest. The lock is why the method choice matters so much: you are committing to a number for nearly a decade.

The one-time switch: your built-in escape valve

There is exactly one legal way to change a running 72(t) without busting it. Rev. Rul. 2002-62 permits a one-time, one-direction switch from the amortization or annuitization method to the RMD method. You can never switch the other way, and you can only do it once.

This is the reason many planners start with a fixed method and keep the switch in their pocket. If Daniel takes the $25,780 amortization payment and the market then drops 35%, his fixed payment becomes an unsustainable share of the account. He switches to the RMD method: his payment immediately drops to whatever the smaller balance ÷ current divisor produces, the plan stays intact, and no penalty applies. The switch lets you start high and dial down if you have to — but never start low and ratchet up.

What most people miss about the “account split”

The single biggest planning move on a 72(t) is one most people never hear about: you do not have to base the schedule on your whole IRA. A 72(t) is computed on the balance of the specific account(s) you designate. Before starting, Daniel can split his $600,000 IRA into two: a $400,000 IRA he runs the 72(t) on, and a $200,000 IRA he leaves untouched.

Why this matters: the untouched $200,000 is now a sealed reserve. If he has an emergency at 55 and needs cash, he can tap the reserve IRA (paying the 10% penalty on just that withdrawal) without busting the 72(t) on the $400,000. Had he run the 72(t) on the full $600,000, that same emergency withdrawal would have detonated the entire plan retroactively. Right-size the 72(t) account to the income you actually need, and quarantine the rest.

A second overlooked point: the balance and the interest-rate month are your choice within limits. You may value the account on any reasonable date near the first distribution, and you may use the 120% federal mid-term rate for either of the two months ending before the first payment — pick the lower one for a smaller fixed payment, or the higher one (up to the 5% cap) for a larger payout. These are levers, not fixed inputs.

72(t) vs. the Rule of 55 on this same money

Before locking a 72(t), Daniel should confirm it is even his best door. The Rule of 55 lets you take penalty-free withdrawals from the 401(k) of the employer you separated from at 55 or later — in any amount, with no fixed schedule and no lock. It is far more flexible than a 72(t).

Daniel cannot use the Rule of 55 here: his money is in an IRA, not a 401(k), and he is 50, not 55. The 72(t) is his only penalty-free path. But anyone choosing between the two should default to the Rule of 55 when it is available — the absence of a lock is worth more than the income-smoothing of a fixed 72(t) payment.

The tax bill on the payments themselves

The 10% penalty is what 72(t) avoids — not ordinary income tax. Every dollar Daniel withdraws from his traditional IRA is taxable as ordinary income in the year received. On $25,780 of withdrawals and no other income, a single filer’s 2026 standard deduction of $15,750 covers a chunk, leaving about $10,030 taxable — taxed in the 10% bracket ($0–$11,925 single) for roughly $1,003 of federal tax. Texas levies no state income tax, so that is his entire tax bill. The RMD-method payment of $16,575 would leave only about $825 taxable after the standard deduction — near-zero federal tax, but also $9,000 less to live on.

This is the real trade-off behind the method choice: the amortization method hands you more cash now but stacks more taxable income into your bracket each year and depletes the account faster. The RMD method keeps your bracket low and your account intact longer, at the cost of current income. Match the method to the income you need to live, not to the largest number the formula will produce.

The decision lever

Pick the method by the income you actually need, then engineer around it. If Daniel needs the full ~$26,000, he runs the amortization method on a right-sized IRA — splitting off a reserve account first so an emergency can never bust the plan — and keeps the one-time switch to the RMD method in reserve as his market-crash escape valve. If he needs less, the RMD method pays him about $16,575, keeps his bracket near zero, lets the balance ride, and removes the rigidity of a fixed payment entirely. The amount is not the goal; matching the formula to your spending and quarantining everything you do not draw on is.