Congress Set the $44,000 Line for Taxing Social Security in 1993 and Never Adjusted It. What It Does to a Couple With a $1.6 Million IRA
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A couple with a $1.6 million traditional IRA crosses the $44,000 line for taxing Social Security in the year the first required minimum distribution is due. Consider a married couple filing jointly in which the IRA owner turns 73 in 2026. The first RMD is $60,377.36, and that single withdrawal pushes the taxable share of their benefits to the 85% statutory maximum.
Two Unindexed Thresholds Decide How Much of Your Benefit Is Taxed
The rule sits in 26 U.S.C. § 86, and it starts with provisional income. That is adjusted gross income figured without Social Security, plus tax-exempt interest, plus one-half of benefits (§ 86(b)(1)). On a joint return, the base amount is $32,000 under § 86(c)(1)(B), and the adjusted base amount is $44,000 under § 86(c)(2)(B).
Between the two lines (tier one), each dollar of provisional income makes 50 cents of benefits taxable, up to $6,000, which is half the gap. Above $44,000 (tier two), 85 cents of benefits is added per dollar, until taxable benefits reach 85% of benefits received (§ 86(a)(2)).
The second tier came from the Omnibus Budget Reconciliation Act of 1993, and neither threshold is indexed for inflation. The Social Security wage base, which is indexed, was $57,600 in 1993 and is $184,500 in 2026.
Each IRA Dollar in Tier Two Is Taxed as $1.85
Inside tier two, a $1 IRA withdrawal adds $1 of IRA income plus $0.85 of newly taxable benefits. In the 2026 12% bracket, that works out to a 22.2% marginal rate. In the 10% bracket, it is 18.5%. This is the tax torpedo, and it is one of nine IRS rules we charted in a free retiree’s tax trap map.
Table Assumptions: tax year 2026; married filing jointly; federal tax only (state income tax varies); Social Security of $38,496 a year, the SSA’s 2026 estimated average of $3,208 a month for an aged couple both receiving benefits; no other income; IRA of $1.6 million on Dec. 31, 2025, with no growth; owner born in 1953, so 2026 is the first RMD year and the Uniform Lifetime divisor is 26.5; the only deduction is the 2026 standard deduction of $32,200. Adding the extra deduction for age 65 and older and the additional senior deduction would lower taxable income. The taxable Social Security column would stay the same.
| IRA withdrawal | Provisional income | Taxable Social Security | Taxable income | Rate on next IRA dollar |
|---|---|---|---|---|
| $20,000 | $39,248 | $3,624 | $0 | 0% |
| $30,000 | $49,248 | $10,460.80 | $8,260.80 | 18.5% |
| $40,000 | $59,248 | $18,960.80 | $26,760.80 | 22.2% |
| $50,000 | $69,248 | $27,460.80 | $45,260.80 | 22.2% |
| $60,377.36 (RMD) | $79,625.36 | $32,721.60 (cap) | $60,898.96 | 12% |
| $120,000 | $139,248 | $32,721.60 (cap) | $120,521.60 | 22% |
The second tier starts at $24,752 of IRA withdrawals and ends at $56,189.18, where the 85% cap takes over. The RMD lands past that point. From there, extra IRA dollars are taxed at the bracket rate only: 12% until 2026 joint taxable income passes $100,800.
Three Levers, Each With a Deadline
- Qualified charitable distribution. Directing part of the RMD straight to charity keeps it out of AGI. A $10,000 QCD drops this couple back into tier two and cuts taxable income by $14,940.04, which lowers federal tax by $1,792.80 at 12%. The 2026 limit is $111,000. The tradeoff is that the gift brings no separate charitable deduction.
- Conversion above the RMD. Under these assumptions, the next $39,901.04 converted in 2026 stays in the 12% bracket. A conversion cannot be reversed. Medicare’s two-year lookback means 2026 MAGI sets 2028 premiums. In 2026, the first joint IRMAA tier starts above $218,000.
- Conversions before 73, or delaying the first RMD. Converting in earlier years shrinks the balance the factor is applied to. A smaller RMD can still land inside tier two. The first RMD can wait until April 1, 2027, but that puts two RMDs on the 2027 return.
A Surviving Spouse Hits Every Line Sooner
A survivor filing single has a base amount of $25,000 and an adjusted base amount of $34,000. In 2026, the single 22% bracket starts above $50,400 of taxable income, and the standard deduction is $16,100. With one benefit and the same IRA, extra dollars can fall in the 22% bracket, for a 40.7% marginal rate. The first single IRMAA tier in 2026 starts above $109,000.
Line 6b Shows Which Side of the Torpedo You Are On
On your 2025 Form 1040, compare line 6b, the taxable part of your Social Security benefits, with line 6a, the net benefits shown on your Forms SSA-1099. If line 6b equals 85% of line 6a, your next IRA dollar is taxed at your bracket rate. If it is lower, every IRA dollar you withdraw is also making more of your benefits taxable.
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Jake has been been working in financial media for almost 15 years. He focuses on all things personal finance for 24/7 Wall St. with high hopes to educate and entertain. Most recently, Jake spent 12 years working various roles at The Motley Fool. He started copy editing fool.com content, worked on premium and marketing campaigns, and helped launch The Ascent, a personal finance brand.
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