You should not owe self-employment tax on this income. The IRS makes an important distinction between active and inactive employment.
If you are not otherwise engaged in the trade in which you are generating royalties, then you don't owe self-employment tax on the royalties. This is passive income, like dividends or interest on investments.
A writer who collects royalties from a book written five years ago, but who is not earning any money from the profession in the current year, is earning passive income.
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