Yes, royalty income is generally considered taxable income by tax authorities worldwide, including the IRS in the United States. Whether royalties are earned from intellectual property, book authorship, music catalogs, mineral leases, or patent licensing, they must be reported on your annual tax returns. Depending on the nature of the income, royalties are typically categorized as ordinary income or subject to specific self-employment and capital gains rules, requiring proper documentation and tax withholding.