Roth Conversion Ladder Timeline Example: How the First Ten Years Actually Work

The Roth conversion ladder is one of the most cited strategies in early retirement planning. It is also one of the most misunderstood — because most explanations stop at the concept and skip the mechanics. "Convert now, wait five years, withdraw penalty-free." Fine. But what do you live on during those five years? What exactly happens in year four? If you also have prior Roth contributions sitting there, do those count?

This post answers those questions with a specific, year-by-year example. The numbers are fictional but the mechanics are real and verified against 2026 IRS rules.

What the five-year rule actually says

Every conversion creates its own five-year clock — separate from the original Roth IRA account clock. The clock starts January 1 of the tax year you convert, not the date the money arrives in the Roth. Convert in December 2026, and the clock starts retroactively on January 1, 2026 — mature January 1, 2031.

Before age 59½, withdrawing converted principal before its five-year period expires triggers a 10% penalty on the withdrawn amount. Earnings stay off-limits until both clocks are satisfied (59½ and five years on the account). If you have prior Roth contributions — not conversions — those come out first and are always accessible, no penalty, no waiting period.

When you withdraw from a Roth IRA, the IRS stacks distributions in this order:

1. Direct contributions (penalty-free always)
2. Conversion amounts, oldest first (FIFO — each with its own five-year clock)
3. Earnings (last, and the ones with the strictest rules)

This ordering matters for bridge funding, as you'll see below.

The example: Maya and Chris retire at 47

Maya and Chris are a hypothetical couple who both retire in January 2026 at age 47. They are not real people; the numbers are constructed to illustrate a working ladder.

Starting position:

• Traditional 401(k)/IRA: $1,400,000
• Taxable brokerage (stocks and funds, mostly long-term): $200,000
• Prior Roth IRA contributions (not earnings): $60,000
• Annual spending target: $52,000

The plan: convert $52,000 per year from the 401(k) to a Roth IRA. Fund living expenses from taxable brokerage and prior Roth contributions during the five-year bridge, then draw on maturing conversion rungs starting in year six.

The 2026 tax math on each $52,000 conversion:

Gross income (conversion only)	$52,000
Standard deduction (MFJ, 2026)	−$32,200
Taxable income	$19,800
10% bracket ceiling (MFJ, 2026)	$24,800
Federal income tax owed	$1,980
Effective rate	3.8%

The entire conversion lands in the 10% bracket because $19,800 in taxable income sits below the $24,800 ceiling. At their marginal rate during working years — typically 22% or higher — the same $52,000 would have cost $11,440 in federal tax. That $9,460 gap, repeated every year, is the ladder's compounding advantage.

Year-by-year timeline

Year	Calendar	Age	Conversion	Living Expenses Funded By	Mature Rung	Federal Tax
1	2026	47	$52,000	Taxable brokerage ($200K → $148K)	—	$1,980
2	2027	48	$52,000	Taxable brokerage ($148K → $96K)	—	$1,980
3	2028	49	$52,000	Taxable brokerage ($96K → $44K)	—	$1,980
4	2029	50	$52,000	Taxable brokerage ($44K) + Roth contributions ($8K)	—	$1,980
5	2030	51	$52,000	Roth contributions ($52K, $8K remaining)	—	$1,980
6	2031	52	$52,000	2026 conversion rung ($52K, now five years old)	2026 rung	$1,980
7	2032	53	$52,000	2027 conversion rung	2027 rung	$1,980
8	2033	54	$52,000	2028 conversion rung	2028 rung	$1,980
9	2034	55	$52,000	2029 conversion rung	2029 rung	$1,980
10	2035	56	$52,000	2030 conversion rung	2030 rung	$1,980

What year six looks like in practice: On January 1, 2031, Maya and Chris withdraw $52,000 from the 2026 conversion rung — tax-free and penalty-free. They simultaneously convert another $52,000 from the 401(k) into a new Roth rung that will mature in January 2036. Lather, rinse, repeat. From year six forward, the ladder is self-sustaining at $52,000/year, and the tax bill is $1,980/year in federal income tax.

The bridge math: Total bridge funds = $200,000 (taxable) + $60,000 (prior contributions) = $260,000. Five years × $52,000 = $260,000. They line up exactly in this example. Real-world planning needs a cushion — an $8,000–10,000 buffer handles market dips that shrink the taxable account when you need to sell.

Why the taxable brokerage is usually the right first source

The FIFO rule says Roth contributions come out before conversions. But strategically, spending the taxable brokerage first preserves the Roth contributions as a fallback. More importantly, long-term capital gains from the taxable account can be taxed at 0% if your ordinary income stays low — which it does in low-conversion years, since the only income is the conversion amount itself.

In Maya and Chris's case, selling taxable positions in years 1–3 while converting $52,000 keeps their gross income below $133,000 (the point where the 12% bracket ends for MFJ in 2026). Long-term gains on low-basis taxable shares could fall entirely in the 0% LTCG bracket. That turns a taxable brokerage full of appreciated stock into a near-tax-free bridge source — and avoids ever touching the Roth contributions until year four.

What happens at 59½

In year 12 or 13 of this plan (around 2038–2039), Maya and Chris hit 59½. At that point, the 10% penalty on early distributions disappears entirely — they can withdraw directly from the 401(k) without penalty, or let conversions keep running.

Most people continue converting even past 59½ for a different reason: the RMD problem. Required minimum distributions from a traditional 401(k) begin at age 75 (under SECURE 2.0) and are calculated on whatever balance remains. If they stop converting at 59½ and let the account grow unchecked, the RMDs that arrive at 75 can push them into the 22%–24% bracket at exactly the moment when Social Security is already filling the lower brackets. Converting now at 10–12% permanently removes those future RMD dollars from the equation.

Three mistakes that kill the ladder early

1. Not converting immediately at retirement. Every year of delay means a year the 5-year clock isn't running. Retire in 2026 and skip conversions until 2028, and you're still not accessing the 2028 rung until January 2033 — two years later than necessary. Start converting in the same tax year you retire.

2. Under-funding the bridge. The most common failure point isn't the conversion mechanics — it's running out of accessible money in year three or four. A bridge that lasts 4.2 years instead of 5 means a forced conversion withdrawal before maturity, triggering the 10% penalty on part of the rung. Stress-test the bridge against a 30% market decline in year two; if the taxable account shrinks materially, do you still have enough?

3. Over-converting into the 22% bracket. The ladder's tax advantage depends on converting at 10–12%. For MFJ in 2026, the 22% bracket starts at $100,800 in taxable income — meaning $133,000 in gross income. If you convert $133,000 and your spouse does part-time work or you have dividend income on top, you can easily tip into 22% on the marginal dollars. Run the math before the calendar year closes; you can undo excess conversions (recharacterization was eliminated for conversions in 2018, so the only fix is being careful going in).

How much can you actually convert per year?

The table above uses $52,000, which matches their spending and stays in the 10% bracket for MFJ. You don't have to match your spending — you can convert more if you have enough bridge funding. The ceiling that most ladders target:

Filing status	Max conversion to fill 12% bracket	Total gross income	Federal tax owed
Single (2026)	$50,400 taxable = $66,500 gross	$66,500	~$6,188
MFJ (2026)	$100,800 taxable = $133,000 gross	$133,000	~$11,600

Converting to the top of the 12% bracket front-loads the 401(k) depletion and maximizes the RMD reduction, at the cost of more bridge funding. Some people split the difference: target the 10% ceiling in early years when bridge funds are tight, then ramp up to the 12% ceiling in later years when the taxable account has had time to grow.

Use the Roth conversion calculator to model which conversion size and bracket-fill strategy matches your own account balances and spending. If you're also figuring out whether retirement at 45 is in reach, the retire at 45 calculator models the full picture — taxes, sequence risk, and Social Security — not just the conversion math in isolation.

The ladder doesn't answer every question

A working Roth conversion ladder solves the penalty problem and improves lifetime tax efficiency. It doesn't solve sequence-of-returns risk, it doesn't account for healthcare costs before Medicare, and it doesn't replace the need to model whether the portfolio is large enough to sustain spending indefinitely. That fuller picture — all accounts, spending, SS timing, ACA premiums, and RMDs modeled together — is what Granary is built for.

This post is planning education, not tax or legal advice. Roth conversion rules involve account-specific details — particularly the pro-rata rule if you hold after-tax IRA contributions — that are worth reviewing with a fee-only CPA before committing to a multi-year ladder.