Tolleson Wealth Management and the mistake behind the 4 percent rule vs. guardrails debate

“Four percent is safe, so I can’t run out”

The 4 percent rule came from William Bengen’s 1994 research. He ran 30-year retirements through the past record of US stocks and bonds. About 4 percent was the starting rate that survived the worst starting years in that record. It is a look at past markets, not a promise about your own account.

That starting number is gross income. A $1.2M portfolio produces a $48K first-year draw at 4 percent, before income tax and before fund or advisory charges. A 1 percent annual charge on $1.2M is $12K, leaving $36K before taxes if it came entirely from the withdrawal.

A 71-year-old may not need a 30-year spending test in the same way as someone retiring at 62. That extra caution can mean money stays unspent, even while family needs or meaningful gifts are put off. Account values can fall below what you invested, and neither approach removes that risk.

Tolleson Wealth Management treats the rule as a useful starting measure, then asks whether your bills, taxes, spouse’s income, and time horizon can live with a flexible paycheck.

“The rule takes 4 percent of my balance every year”

Year one takes 4 percent of the starting balance, then every later year takes that same dollar amount increased for inflation, regardless of what markets did. On $1.2M, that is $48K in year one and $49,440 in year two with 3 percent inflation for illustration ($48K × 1.03), even if the account fell. Taking 4 percent of each year’s balance is a different method, called a flat-percent withdrawal, and its monthly pay swings with the account.

“Guardrails just mean my pay gets cut”

Guardrails can cut pay after a poor start, but they also begin with more income and allow a raise after a strong start. Tolleson Wealth Management uses a simple band in this illustration: begin at 5 percent, trim pay 10 percent when the current withdrawal rate rises above 6 percent, and raise it 10 percent when the rate falls below 4 percent.

Find the bad-start row first. It shows the trade your budget has to absorb: a $5K monthly starting draw becomes $4.5K after one trim, while the fixed rule remains at $4K monthly before its inflation adjustment.

“A target I set at 55 still works at retirement”

Older retirement playbooks can be out of date. Required distributions once began at 70½, then 72; IRS rules now start them at 73, or 75 for anyone born in 1960 or later. For a reader 10 to 15 years out, a 4 percent target needs 25 times annual spending, so $60K needs $1.5M; a 5 percent guardrails start needs 20 times, or $1.2M, a $300K gap. The IRS 2026 catch-up is $8,000 annually at age 50 or older in a 401(k), with $11,250 at ages 60 through 63; ten years of the $8,000 catch-up adds $80K before growth.

Pavel at 71: a $210K gap his children would feel

For illustration: Pavel, a hypothetical 71-year-old divorced retired pharmacist, has a $2.1M traditional IRA and two adult children. Nearly all of his savings sit in that IRA, and required distributions are approaching at 73. The 4 percent rule pays $84K annually ($2.1M × 4 percent), or $7,000 monthly. A guardrails start at 5 percent pays $105K ($2.1M × 5 percent), or $8,750 monthly.

If Pavel’s withdrawal rate rises above the 6 percent line, a 10 percent trim takes the guardrails pay to $94,500 ($105K × 0.90). That still sits $10,500 above the fixed-rule draw for that year. The larger starting gap is $21K annually: $105K minus $84K. Over ten years, that is $210K more spent or given away ($21K × 10), before investment growth or any trims.

That $210K has an heir-side cost. Under IRS rules, most non-spouse beneficiaries must empty an inherited IRA by the end of the tenth year after the owner dies. If Pavel left that $210K in the IRA, it would be $105K for each child, taxable during years when they may be earning their most. At an assumed 25 percent tax rate for illustration, each keeps about $78,750 ($105K × 0.75).

Pavel would owe tax on the money if he spent it, too. The real trade is $21K annually for spending and gifts now versus about $78,750 per child later under those assumptions. Neither method settles the tax question: a $105K traditional IRA draw counts fully toward MAGI and, with taxable Social Security, can pass the first Medicare premium tier for a single filer.

Before Tolleson Wealth Management sets a guardrails draw for someone in Pavel’s position, it checks that draw against the required distribution due at 73. An $84K or $105K draw will likely cover it, so the required distribution does not create extra income, but the current IRS table must confirm the amount. A Roth conversion strategy can reduce future traditional IRA balances, though it creates taxable income in the conversion year.

Which dates drive a 4 percent or guardrails draw from an IRA?

January, April, June, September, December, and the following January set the working calendar for an IRA paycheck. The custodian mails Form 1099-R by January 31, the guardrails check uses the prior December 31 balance in January, estimated-tax dates are April 15, June 15, September 15, and January 15, and December 31 closes the year for a Roth conversion and that year’s required distribution.

Budgeting a gross 4 percent draw as take-home pay creates a fast, visible shortfall. An $84K withdrawal appears to be $7,000 monthly, but 20 percent federal withholding makes the deposit $5,600 monthly. That is $1,400 less each month, or $16,800 across the year, before state tax where applicable.

Delaying the first required distribution to April 1 of the year after turning 73, a move careful people make to keep income low, can put two distributions in one tax year. For a single filer whose MAGI crosses $109,000, Medicare’s 2026 Part B premium two years later rises from $202.90 to $284.10 monthly, costing $974.40 more for that year. Medicare IRMAA planning belongs beside the withdrawal decision, not after it.

A quick test helps with the spending choice: if fixed monthly bills fit inside 90 percent of a guardrails starting paycheck, the pay after one 10 percent trim, guardrails offer more income to start. If they do not, the steadier dollars of the 4 percent rule may fit better. Tolleson Wealth Management also looks at Social Security claiming because a later benefit can change how much of the IRA needs to pay the bills.

Can I switch from the 4 percent rule to guardrails at 71?

You can switch at 71 by measuring the current annual draw against the current IRA balance, then setting a written 4 percent to 6 percent band and a 10 percent adjustment. A rate under 4 percent leaves room to raise pay; a rate over 6 percent calls for a trim before higher spending becomes routine.

Pull your latest IRA statement and add the last 12 months of withdrawals. Divide those withdrawals by the balance. For example, $84K divided by $2.1M equals 4 percent. Then decide what transfer amount would follow a 10 percent trim, set withholding on the custodian’s form, and put the band, step, and January check date in your playbook.

The task people often forget is the beneficiary form after a divorce, death, or remarriage. The first row in the table is the rate check, because it determines the pay change; most other actions are yours or the custodian’s.

Tolleson Wealth Management runs both paychecks on your own IRA balance

Tolleson Wealth Management can run the 4 percent rule and a guardrails band side by side on your actual balance, showing the monthly deposit after a good start and a bad one. Before money moves, the firm explains in writing how it is paid. Use the request form to ask for that comparison.