Page 16 of Form 1 Instructions lists:
EXCEPTIONS Even though Schedule 1 has entry lines for medical expenses, interest paid, and gifts to charity, not all of the amounts of these items that are deducted on federal Schedule A (Form 1040) can be used for the itemized deduction credit. The following describes the portion of these items that may not be used to compute the itemized deduction credit.
• Amounts allocated to you on Schedule 5K-1 or 3K-1 by a tax-option (S) corporation or partnership if the entity elected to be taxed at the entity level.
• Medical expenses – the amount of medical care insurance and long-term care insurance claimed as a subtraction on Schedule SB, lines 6 and 7. If this applies to you, complete the worksheet on the next page to figure the amount which you are allowed, if any, for purposes of the itemized deduction credit.
• Interest
– Paid to purchase a second home located outside Wisconsin
– Paid to purchase a residence which is a boat – Paid to purchase or hold U.S. government securities
– Mortgage insurance premiums treated as interest
• Contributions and interest allocated to you by a tax-option (S) corporation if you treated the amount as a subtraction on Schedule SB, line 43
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