The tax rule is the most under-published part of the subject, and its mechanism is worth following because the cross-reference does something counterintuitive. Section 1(h)(5)(A) of the Internal Revenue Code defines collectibles gain as gain from the sale of "a collectible (as defined in section 408(m) without regard to paragraph (3) thereof)" held more than one year. Section 408(m)(2) lists what a collectible is for that purpose and includes "any metal or gem" and "any stamp or coin". So gold is inside the definition.
Paragraph (3) is the interesting part. It carves certain gold, silver, platinum and palladium coins and bullion out of the definition, which is what makes them permissible in an individual retirement arrangement, conditional on the bullion being "in the physical possession of a trustee". But section 1(h)(5)(A) instructs the reader to apply 408(m) "without regard to paragraph (3)". The carve-out is switched off for the rate rule. The consequence is that the identical bullion can be eligible to sit inside an IRA and still be a collectible for the 28 percent ceiling when held in a taxable account. The two provisions genuinely disagree, by design.
It is a ceiling rather than a rate, and the distinction is not cosmetic. Section 1(h)(1) opens by saying that where a taxpayer has a net capital gain, the tax "shall not exceed" the sum of the amounts it then computes, and 28 percent appears as the last of those. A taxpayer whose ordinary rate is below 28 percent does not pay 28 percent on collectibles gain. Anyone reading "gold is taxed at 28 percent" as a flat rate is overstating the bill for lower earners and understating the complexity for everyone.
How a fund is taxed depends on how the fund is built, and for the physically backed trusts the disclosure is explicit. The annual report of one large gold trust states that "the Trust will be classified as a grantor trust for United States federal income tax purposes" and that "shareholders will be treated, for United States federal income tax purposes, as if they directly owned a pro rata share of the underlying assets held in the Trust". It then states that gains recognized by individuals from the sale of collectibles, including gold, held for more than one year "are taxed at a maximum rate of 28%, rather than the current maximum 20% rate applicable to most other long-term capital gains", and that gain on shares held more than a year will generally be taxed at that maximum. So the wrapper does not launder the character of the gain away. Mining shares are a different matter entirely, because a mining company is an ordinary corporation and its shares are ordinary shares.
The IRA route has a trap serious enough to name, though the detail belongs to the precious metals IRA page rather than here. Section 408(m)(3) makes bullion eligible only if it is in the physical possession of a qualifying trustee, and 408(m)(1) treats an acquisition that fails the test as a distribution from the account. Arrangements that promise to store IRA metal at home run directly into that condition.
On the "inflation hedge" claim, the honest framing is about mechanism rather than about results. Gold has no coupon that inflation erodes and no issuer whose promise can be inflated away, which is the structural reason people reach for it. It also has no cash flow to grow, so it offers nothing to compound and its price can move a long way in either direction for reasons unrelated to consumer prices. Whether it has protected purchasing power over any particular period is an empirical question with a period-dependent answer, and any figure quoted for it should be read with the start and end dates clearly in view.