Warren Buffett's 2010 federal tax bill, including income tax and payroll taxes paid by and on behalf of him, was $6,938,744.

True: Buffett's 2010 federal tax return, or a documented, independently verifiable source for it, shows total federal income tax plus payroll taxes paid by him and on his behalf of $6,938,744 (or within a few dollars of it). Mostly true: the documented total differs by less than 1%, or the components are defined slightly differently. Mixed: documents put the total within 1–10% of the stated figure. Mostly false: the documented figure differs by more than 10% but is of the same order of magnitude, or it covers a different year or tax mix. False: documents show a substantially different figure. Buffett's own repetition of the figure does not settle it; contradicting documentary evidence is needed for a false verdict.

Set before the research began.

1. E1 Buffett Releases 2010 AGI ($62.9m), Taxable Income ($39.8m) & Tax ($6.9m) TaxProf Blog (Association of American Law Schools) · 12 October 2011 Own record

   “Federal Income Tax (line 60): $6,923,494”

2. E2 Buffett Releases 2010 AGI ($62.9m), Taxable Income ($39.8m) & Tax ($6.9m) TaxProf Blog (Association of American Law Schools) · 12 October 2011 Own record

   “Mr. Buffett also reported that he paid $15,300 in payroll taxes, resulting in a 17.4% effective tax rate:”

3. E3 Buffett Releases 2010 AGI ($62.9m), Taxable Income ($39.8m) & Tax ($6.9m) TaxProf Blog (Association of American Law Schools) · 12 October 2011 Own record

   “Mr. Buffett said he would release his full tax return if the other 399 of the richest 400 Americans release theirs.”

4. E4 Warren Buffett's Actual Tax Rate Much Closer To 31%, While His Office Workers Pay 21% Forbes (contributor opinion by George P. Harbison) · 23 October 2013

   “the fact that Buffett never released (a) his 2010 federal tax return, (b) the federal tax returns of his office workers, and (c), the analysis underlying has”

5. E5 Warren Buffett's Actual Tax Rate Much Closer To 31%, While His Office Workers Pay 21% Forbes (contributor commentary by George P. Harbison) · 23 October 2013

   “he made the assertion that his 2010 “federal tax rate” of 17.4% was 18.6 percentage points less than the 36.0% average rate paid by the twenty other workers in his office.”

6. E6 Warren Buffett's Actual Tax Rate Much Closer To 31%, While His Office Workers Pay 21% Forbes (contributor commentary by George P. Harbison) · 23 October 2013

   “Adding to the unchallenged acceptance of Buffett’s assertion was the fact that Buffett never released (a) his 2010 federal tax return, (b) the federal tax returns of his office workers, and (c), the analysis underlying has “federal tax rate” assertion.”

7. E7 Buffett Picks the Wrong Fight -- Again Fox Business · 3 March 2016 Own record

   “Buffett says in his New York Times’ editorial that he paid $6,938,744 in total income and payroll taxes in 2010.”

8. E8 Buffett Picks the Wrong Fight -- Again Fox Business · 3 March 2016

   “Last October, Buffett released more detail, saying his 2010 tax return included $62.9 million of adjusted gross income and $39.8 million of taxable income, upon which he paid taxes of $6.9 million, for an effective federal tax rate of 17.3%.”

Buffett's later disclosure, as reported by TaxProf Blog, gave federal income tax on line 60 of $6,923,494 and payroll taxes of $15,300 (E1, E2). Those sum to $6,938,794, closely matching the claimed $6,938,744. However, these figures come from Buffett's own release, not from the return itself. A later Forbes commentary states he never released his 2010 federal tax return (E4, E6), and the Fox Business pieces only relay his statements (E7, E8). Under the criteria, Buffett's own repetition does not settle the claim, and no independent or official documentary source verifies or contradicts the total.