According to the IRS, the one-participant 401(K) is the same as an individual 401(K) plan. When you go through the steps outlined by MinhT1, there will be a question that asks if you contributed to an individual or Roth 401 K plan. You will say yes and complete the section.
Please view this IRS publication as it addresses one-participant 401K plan one-participant 401K plan.
@Kmorckel241
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