My boyfriend & I own a property jointly. We file separate returns. Last year we converted it to a rental property. What values do I enter for depreciation (1/2 for each)?

You will enter your share.  Show it just like you own the whole place in TurboTax at whatever your value is.

So for example, if it is $150K then you enter $75K.

The first year, is the most difficult, so take your time as this impacts many years to come.  You will need to know the purchase price, the value of the land versus the building, the fair market value when placed in service.  

Rentals can be great tax advantage to you.

Got it. I entered 50% values on each of our returns, and we are each listed as an active participant. However, when the Schedule E Worksheet printed out it does not indicate the property is jointly owned and that we each have a 50% ownership interest.  Is that a problem?

No that is not a issue for tax purposes, just need to agree on improvements and when and if you want to sell it.