Recent statistics that I've seen indicate that about 66% of electronically filed returns are filed by paid preparers. This doesn't necessarily mean that these filers don't have the intelligence but it does indicate that they have a level of discomfort and anxiety and prefer the solace of having a paid preparer fill out and transmit the forms. It all depends on the level of complexity of the form. For the young wage earner living at home with his or her parents, who is able to operate a computer and can operate simple tax return software, I would think that 80% should be intelligent enough to fill out tax forms. Especially because the software is designed to prompt and assist (and check the arithmetic).One of America's most respected jurists, Judge Learned Hand, offers a more thoughtful observation on the law of taxation: ‘In my own case the words of such an act as the Income Tax ... merely dance before my eyes in a meaningless procession, cross-reference to cross-reference, exception upon exception—couched in abstract terms that offer no handle to seize hold of—leave in my mind only a confused sense of some vitally important, but successfully concealed, purport, which it is my duty to extract, but which is within my power, if at all, only after the most inordinate expenditure of time. I know that these monsters are the result of fabulous industry and ingenuity, plugging up this hole and casting out that net, against all possible evasion, yet at times I cannot help recalling a saying of William James about certain passages of Hegal [sic]: that they were no doubt written with a passion of rationality, but that one cannot help wondering whether to the reader they have any significance save that the words are strung together with syntactical correctness.‡ Ruth Realty Co. v. Horn, 222 Or. 290, 353 P.2d 524, 526 n. 2 (Or. 1960) (citing 57 Yale L.J. 167, 169 (1947)), overruled on other grounds by Parr v. DOR, 276 Or. 113, 553 P.2d 1051 (Or. 1976). The Humorist Dave Barry had this observation "The IRS is working hard to develop a tax form so scary that merely reading it will cause the ordinary taxpayer's brain to explode.” His candidate for the best effort so far is Schedule J Form 1118 "Separate Limitation Loss Allocations and Other Adjustments Necessary to Determine Numerators of Limitations fraction, Year end Recharacterization Balance and Overall Foreign Loss Account Balances"And don’t forget this observation from Albert Einstein “The hardest thing to understand in the world is the income tax. “ So if Al had trouble understanding taxes, I don't see how a mere mortal has any chance.