The “backdoor Roth” exists because of one rule change. Through 2009, you could not convert a Traditional IRA to a Roth if your modified adjusted gross income was $100,000 or more. Effective 2010, that income limit was repealed — and Roth conversions jumped 847% to $64.8 billion, the only year on record they exceeded total IRA contributions. They never returned to the old baseline. Using IRS Statistics of Income data for 2007–2014, this study traces that arc and shows who actually converts: in 2010, 79% of conversion dollars came from filers earning more than $100,000 — the very group the repealed limit had blocked.

$64.8B

Roth conversions in 2010

+847%

One-year jump, 2009 → 2010

79%

Of 2010 conversion dollars from filers above $100K

~$455K

Average conversion by $1M+ filers (16× the middle)

insights

Key Findings

  • trending_upThe 2010 spike. Conversions rose from $6.8B (2009) to $64.8B (2010) — a +847% jump — the year the $100K conversion income limit ended.
  • swap_vertThe lone crossover. 2010 is the only year in the data that conversion dollars ($64.8B) exceeded total IRA contributions ($51.2B).
  • groupsA high-earner move. 79% of 2010 conversion dollars ($50.9B) came from filers above $100,000 of AGI; 63% ($40.9B) from filers above $200,000.
  • paidBigger at the top. Filers with $1M+ AGI converted ~$455,000 on average — about 16× the typical $50K–$75K filer (~$28,000).
  • historyA new normal. After 2010, conversions settled at $8–$18B a year — well above the $2–$7B pre-2010 baseline. The backdoor era had begun.

The rule that built the backdoor

A Roth IRA is funded with after-tax dollars and grows tax-free. For high earners there has always been a catch: you cannot contribute directly to a Roth once your income clears the annual limit. But you can contribute to a Traditional IRA (non-deductibly, if your income is high) and then convert that balance to a Roth. The conversion is the “back door.”

That door was bolted shut until 2010. The original Roth statute barred anyone with modified AGI of $100,000 or more from converting. The Tax Increase Prevention and Reconciliation Act of 2005 repealed that income cap effective January 1, 2010, and — as a one-time sweetener — let 2010 converters spread the resulting tax across 2011 and 2012. For the first time, a six- or seven-figure earner could move money into a Roth. The data shows they did, immediately and at scale.

Chart 1

Roth IRA conversions by year, 2007–2014

Roth IRA conversions by year, 2007 to 2014 Annual Roth conversion dollars surged from $6.8 billion in 2009 to $64.8 billion in 2010, the year the income limit was repealed, then settled near $8 to $18 billion. $0B $20B $40B $60B $2.3B 2007 $3.7B 2008 $6.8B 2009 $64.8B 2010 $11.3B 2011 $18.1B 2012 $7.5B 2013 $8.3B 2014 2010: the $100K conversion income limit is repealed

Source: IRS SOI, Accumulation and Distribution of IRAs, Table 2 (all returns), tax years 2007–2014. The 2010 income-limit repeal took effect January 1, 2010.

The 2010 figure is not a rounding artifact. It sums exactly across every income bracket in the IRS table to $64.768 billion, and it matches the IRS Bulletin’s own narrative that conversions “rose over 800 percent” that year. The one-time option to spread the conversion tax over 2011–12 almost certainly amplified the spike — but conversions never fell back to their pre-2010 range, which is the more durable story.

The only year conversions beat contributions

To see how unusual 2010 was, set conversions next to total IRA contributions — the much larger, steadier flow of new money into IRAs. In every year of the window except one, contributions dwarf conversions. In 2010 the lines cross.

Chart 2

Roth conversions vs. total IRA contributions, 2007–2014

Roth conversions versus total IRA contributions, 2007 to 2014 In 2010, Roth conversions ($64.8 billion) exceeded total IRA contributions ($51.2 billion) for the only time in the period; in every other year contributions were far larger. $0B $20B $40B $60B 2007 2008 2009 2010 2011 2012 2013 2014 the only crossover Roth conversions Total IRA contributions

Source: IRS SOI Table 2 (all returns). 2010 is the only year conversion dollars exceed total IRA contributions.

Contributions barely moved (they hovered near $50–$63B all decade). It was conversions that exploded — a one-year behavioral response to a one-time change in the rules.

Who actually uses the backdoor

A strategy that is technically open to everyone is, in practice, dominated by the top of the income distribution. Breaking the 2010 conversions out by adjusted gross income makes the point starkly. The dashed line marks $100,000 — the income level the repealed limit had blocked. Nearly four-fifths of all the dollars sit above it.

Chart 3

Where the 2010 conversion dollars came from, by AGI

2010 Roth conversion dollars by adjusted gross income bracket Conversion dollars cluster at the top: the $200,000 to $500,000 bracket converted $18.2 billion and the $1 million-plus bracket $14.4 billion. Filers above $100,000 — the income level the repealed limit had blocked — account for 79 percent of all 2010 conversion dollars. $0B $5B $10B $15B No AGI $2.5B $1–$5K $50M $5–$10K $117M $10–$15K $138M $15–$20K $700M $20–$25K $380M $25–$30K $293M $30–$40K $1.0B $40–$50K $1.4B $50–$75K $2.8B $75–$100K $4.6B $100–$200K $10.0B $200–$500K $18.2B $500K–$1M $8.4B $1M+ $14.4B ↑ above the repealed $100K limit — 79% of all conversion dollars ($50.9B) ↓ below $100K — 21% ($13.9B)

Source: IRS SOI Table 2, tax year 2010. Brackets shown by the lower bound of AGI. Filers above $100,000 account for 79% of conversion dollars.

Read it two ways. By dollars, the money is concentrated at the top: the $200K–$500K and $1M+ brackets alone account for over half of everything converted. By headcount, the largest single group of converters was the $100K–$200K bracket (about 250,900 taxpayers). The typical converter wasn’t a billionaire — but the typical converted dollar belonged to someone earning well into six figures. Use the explorer below to see the count, the dollars, and the average for any bracket.

Explore the data

2010 Roth conversions — pick an income bracket

AGI bracket

Taxpayers converting

Amount converted

$B

Average conversion

$

% of all 2010 conversion dollars

The higher the income, the bigger the conversion

Average conversion size tells the rest of the story. From the middle brackets up through $200,000, the average conversion stays remarkably flat — roughly $28,000 to $40,000. Then it escalates: filers with AGI above $1 million converted about $455,000 apiece, on average.

Chart 4

Average 2010 conversion size, by income bracket

Average 2010 Roth conversion size by income bracket The typical conversion stays near $28,000 to $40,000 from the middle brackets up through $200,000, then escalates sharply: $1 million-plus filers converted about $455,000 on average, roughly 16 times the $50,000 to $75,000 filer. $0K $100K $200K $300K $400K $30–$40K $29K $50–$75K $28K $75–$100K $39K $100–$200K $40K $200–$500K $108K $500K–$1M $182K $1M+ $455K — 16× the $50K–$75K filer

Source: IRS SOI Table 2, tax year 2010. Average = amount converted ÷ number of taxpayers converting in each bracket.

That is the backdoor (and its bigger cousin, the mega backdoor Roth) in one chart: a tool whose value scales with how much you can afford to move, used hardest by those who can move the most.

Methodology

All figures come from the IRS Statistics of Income (SOI) program’s study, “Accumulation and Distribution of Individual Retirement Arrangements,” which is built from matched samples of Form 1040, Form 5498 (IRA contributions and conversions), and Form 1099-R. We used Table 2 — by Size of Adjusted Gross Income, pulling the per-year data files for tax years 2007 through 2014.

  • Series — by year (2007–2014). Roth conversions and total IRA contributions, taken from each year’s “All returns” row.
  • Series — 2010 by AGI. The number of taxpayers converting and the amount converted, by AGI bracket, for tax year 2010.
  • Units. The source reports dollars in thousands; we converted to billions. Averages are amount ÷ number of taxpayers.
  • Cross-check. Our 2010 total of $64.768B sums exactly across the AGI brackets and matches the Fall 2013 SOI Bulletin’s “rose over 800 percent, to $64.8 billion.”
  • Window. Clean conversion-by-year figures are available 2007–2014 in this table; the file format and column layout change after ~2014, so we cap the series there. The 2007–2014 window fully captures the before, the spike, and the after.

We describe 2010 as the year the surge coincided with the income-limit repeal (plus the one-time tax-spread option); we do not claim the repeal was the sole cause. The underlying numbers are available to download below so you can check our work.

Download the data

Free to use with attribution to RothIRAHub (and a link back to this page). If you cite it, please also credit the original IRS Statistics of Income source.

table_view Conversions by year, 2007–2014 CSV · conversions vs. contributions ($B) table_view 2010 conversions by AGI bracket CSV · count, amount, and average by bracket

The bottom line

The backdoor Roth wasn’t designed — it emerged. Congress lifted an income cap in 2010 to raise short-term revenue, and high earners responded by converting on a scale no one had seen, then kept doing it. Lawmakers have periodically proposed closing the door again (the 2021 Build Back Better bill would have barred conversions of after-tax money), but it remains open. If your income is above the Roth limit, the mechanics are on our backdoor Roth and conversion rules pages — and the pro-rata rule is the trap to understand first.