If you have a Pass-Through Entity credit on Line 9 of your MN Schedule of Refundable Credits (M1REF), you must attach either Schedule KS, KPI, or KF with your return, so it can't be e-filed in TurboTax. The rest of the credits do not require a statement to be attached, so those can be e-filed, but the PTE credit will need to be mailed, unfortunately. The MN Department of Revenue does require the attachment.
From the M1REF instructions - Line 9 — Pass-through Entity Tax Credit The pass-through entity tax credit is a refundable credit for qualifying individuals of a pass-through entity that elects to pay tax at the entity level. The entity passes the refundable credit for taxes paid by the entity to the individual shareholders, partners, and beneficiaries. Include the amounts from line 30 of Schedules KS, line 30 of Schedule KPI, and line 36 of Schedule KF. Attach Schedules KS, KPI, or KF with your return. Your refund will be delayed or denied if you do not provide the information. @Apolx
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