I was pleasantly surprised this tax-filing season to discover how low our tax bill was for 2025. Now retired, the difference last year was that only 25% of our AGI was from ordinary income. The rest (75%) was from long-term capital gains and qualified dividends. An article in the May 2026 edition of Kiplinger's Retirement Report explains it most succinctly:
"When the ordinary income portion of one's taxable income (AGI – deductions) is below the threshold ($96,700 MFJ), LT capital gain and qualified dividends are taxed at 0%; until they push you over that threshold." The cover story in the April 2026 issue of the AAII Journal, "Managing the Tax Impact of Capital Gains Stacking" by Charles Roblut, also provides some insight. Incidentally, that threshold for 0% tax on qualified investment income increases to $98,900 in 2026 for MFJ filers.
The result was that a good portion of investment income was taxed at 0%, even though one's AGI can well exceed the 0% threshold. Given that retirement income, IRA distributions and Roth conversions, etc. are considered ordinary income, they only serve to push one over that threshold. I therefore expect that when RMDs eventually kick in, this lucrative low-tax window (for taxable investment income) will disappear.
Incidentally, my tax software was of no help determining the source of the tax reduction. My insight came from manually completing the tax worksheet within the Form 1040-SR instructions. These can be downloaded from the IRS web site.
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Chris Thornton, Retired
St. Charles, Illinois
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