Yes, if you submit it and it isn't in English. Any foreign-language document filed with USCIS needs a full English translation with the translator's certification that it is complete and accurate and that they are competent to translate the language.
Tax returns are long, form-based documents, and a full translation covers every page you submit: the taxpayer details, each income category, deductions, the tax calculated, payments on account, the refund or balance due, and the tax office's stamps or electronic filing confirmation. Box and line numbers are kept so an officer can match the translation to the original.
Forms are translated as forms, not rewritten as prose. Tax documents are the only paperwork where box 47 can be the most important thing on the page, and we'd like the officer to find it in the same place.