The bottom right on page 2 says:
If during the tax year you convert property used solely for personal purposes to business/investment use (or vice versa), figure the percentage of business/investment use only for the number of months you use the property in your business or for the production of income. Multiply that percentage by the number of months you use the property in your business or for the production of income and divide the result by 12. For example, if you converted a vehicle to 50% business use for the last 6 months of the year, you would enter 25% on line 5 (50% multiplied by 6 divided by 12).
Only business use time and percentages count towards the credit.
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