What are the tax filing requirements for UBTI?
In computing UBTI, a specific deduction of $1,000 is permitted. If a Solo 401(k) Plan has gross UBTI of $1,000 or more during its fiscal year, it must file a completed IRS Form 990-T to report such income and pay any tax due. The Form 990-T is due at the same time as the Form 990, however, if the Solo 401(k) Plan expects its annual UBIT (after certain adjustments) to be $500 or more, then it must make estimated tax payments throughout the year. The Form 990-T is not subject to public disclosure like the Form 990.
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