Thank you all for your help, I downloaded a Excel file off MS site which seems to be helpful but just like in my last question I like to include a month tab where I can add a value (C3 and C4). Then in C10 would be the difference in C3 and C4 in months. And then E22 would be the value of in months but it gets a little tricky, as we all know in a year has 12 month and if I take 18 months. It will have to take the value of year 1 depreciation and 6 month of year 2 base of the value of C10. This should occur in any month I chose, so for 28 months it be year 1 and year 2 depreciation value plus 4 months of year 3. Hope that makes sense, please see attach file and thank you.