Need no total function in E-Mails

In Germany we have to show the customers the product-prices including the tax (gross). But at the end of the form near by the total price we also have to show the included tax.

In the form I solved this by using product fields with calculation for tax and total. All product-prices are shown with tax (gross). My tax field calculates the tax from the gross-prices. Because of this I can´t use the automatic total-function: the calculated tax is only for information, but the automatic will add it again, so the total ist gross-price plus tax = "double tax". To solve this I use my own total function with an calculating product field.

So far so good, it works fine. But in the Mails there are again automated total-fields in the order-table at the end, by using {all_fields}. It adds the product prices, my calculated total and my calculated tax - and so the new total price is more than double from the real correct total.

Where and how can I customize this E-Mail-table, I need to delete the automated total-calculation there?! I hope this works, because the other way by constructing the Mails manually would be much more complicated, i have many fields and conditionally-logic fields. So "all-fields" is very easy and quite perfect for me, except the automated total.

Thank you for your answer. I solved the problem by using a number-field with calculation for calculating the tax. Now I can use the standard total field and with this the form and the mail work both perfectly.

But with this I have a new styling problem. I designed the background-color of the input fields to grey, and a special green on focus.

This is my css-code für the input-fields:

[css]
.gform_wrapper input[type="text"], .gform_wrapper input[type="url"], .gform_wrapper input[type="email"], .gform_wrapper input[type="tel"], .gform_wrapper input[type="number"], .gform_wrapper input[type="password"],body .gform_wrapper .gform_body .gform_fields .gfield select, body .gform_wrapper .gform_body .gform_fields .gfield textarea {
    font-size: 14px !important;
    font-weight: bold;
    color: #99001E;
    letter-spacing: 0.1em !important;
    background-color: #F5F5F5;
    border: 1px solid #C9C9C9;
    border-radius: 2px 2px 2px 2px;
}
.gform_wrapper input:focus, .gform_wrapper textarea:focus {
    background-color: #E2E3BA;
}

This also works for my special number-tax field (#field_1_59). But this field must always (normal and focus) be blue in the (calculated) input-area. I tried anything I found, but it will not work. Any ideas?!

My new problem is solved. I searched again in the forum and found the very easy code:

[css]
#input_1_59 {
    background-color: #E7F8FF !important;
    border: none !important;
}