greater than

this seemed to be working fine...but i came across this:

dim itemtotal, headertotal as double

headertotal = 90.11
itemtotal = 65.04
txtitemcost.text = 25.07

it goes to the msgbox, I thought it may of been a rounding issue but I inserted another purchase using the same decimals
headertotal = 50.11
itemtotal = 25.04
txtitemcost.text = 25.07...that worked fine..am I missing something here?

VB Code:

If (itemTotal + CDbl(txtItemCost.Text)) > headerTotal Then
     amountneeded = (headerTotal - itemTotal)
     MsgBox("Item total is greater than Receipt amount" & vbCrLf & vbCrLf & "Receipt Total: $" & headerTotal & vbCrLf & "Item Total: $" & itemTotal & vbCrLf & vbCrLf & "Amounted needed to balance: $" & amountneeded, MsgBoxStyle.Information, "PCMS ")
                Exit Sub
            End If

I ran a test here and got the value of:

Dim x As Double
x =(itemTotal + CDbl(txtItemCost.Text))
x = 90.1100000000014...this does indeed make it greater than...is there a way I can trim this?