Sub Button1Click(ByVal sender As Object, ByVal e As EventArgs) Dim PaymentText As New Double Dim rate As New Double Dim principal As New Double Dim months As New Integer rate = rate / 1200 + TextBox2.Text principal = TextBox3.Text months = TextBox4.Text PaymentText = (rate + (rate / ((1 + rate) ^ months) - 1)) * principal Label1.Text = PaymentText End Sub