Royalty deduction for authors: permitted exclusion of qualifying book royalty income subject to repatriation, certification, and limits.

Allows resident individual authors a deduction for income from assignment of copyright or royalties for eligible non-text-book works, equal to the qualifying income or a capped amount, with non-lump-sum royalties limited by reference to a percentage of books sold; foreign-source income counts only if repatriated in convertible foreign exchange within six months (or extended period) and deduction requires prescribed payer and authority certificates filed with the return, with no double allowance under other provisions.

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