How do I modify the amortization method from SL to 150% double declining balance on TurboTax?

[Critter]

What ?   Closing costs are added to the cost basis of the property when you place it into service.  Why are you trying to enter them now separately ?

[ngr3000]

I used the wrong term. I'm trying to amortize them and not depreciate.

[Critter]

Did you refinance the loan ?   Is that what you are calling closing costs ?  

[ngr3000]

yes

[Critter · Accepted solution]

Ok ... If this is for a rental property then you needed to choose the correct section on this screen : 

[ngr3000]

That is what I selected. I defined the life as 15 year but could not set the method to 150% DDB

[Critter]

The Default for amortization is deducted ratably over 15 years(180 months).. you cannot choose 150%DB ... the program will do this automatically ... review the depreciation worksheet.