IAUM is an efficient way for investors to hold physical gold by providing exposure to the day-to-day movement of the price of gold bullion. The fund removes the complexities for retail investors of buying, transporting, storing, and insuring physical gold. Using a grantor trust structure, the underlying gold bars are held in vaults, with an inventory found on the fund website. Since IAUM is considered a collectible, investors should know that long-term gains have noteworthy tax liabilities. The daily NAV of the trust is based on that days LBMA Gold Price PM. The fund is a trades at a lower handle and launched with a lower expense ratio as compared to its larger sibling fund IAU.