How do i add sales tax to my total

In order to calculate the sales tax of an item, we need to first multiply the pre-tax cost of the item by the sales tax percentage after it has been converted into a decimal. Once the sales tax has been calculated it needs to be added to the pre-tax value in order to find the total cost of the item. Let's start by working with an example. If a magazine costs $2.35 and has a 6% sales tax, then what is the total cost of the item. First, we need to convert the sales tax percentage into a decimal by moving the point two spaces to the left.

How do i add sales tax to my total

Now, we need to multiply the pre-tax cost of this item by this value in order to calculate the sales tax cost.

How do i add sales tax to my total

How do i add sales tax to my total

Round to two decimal places since our total is in dollars and cents.

How do i add sales tax to my total

Last, add this value to the pre-tax value of the item to find the total cost.

How do i add sales tax to my total

How do i add sales tax to my total

How do i add sales tax to my total

Calculating the sales tax percentage of a total:

If we are given the total cost of an item or group of items and the pre-tax cost of the good(s), then we can calculate the sales tax percentage of the total cost. First, we need to subtract the pre-tax value from the total cost of the purchase. Next, we need to create a ratio of the sales tax to the pre-tax cost off the items. Last, we need to create a proportion where the pre-tax cost is related to 100% and solve for the percentage of the sales tax. Let's start by working through an example. If a person pays $245.64 for groceries that cost $220.00 pre tax, then what is the sales tax percentage for the items.

First, subtract the pre-tax value from the total cost of the items to find the sales tax cost.

How do i add sales tax to my total

How do i add sales tax to my total

How do i add sales tax to my total

Next, create a ratio of the sales tax to the pre-tax cost of the items.

How do i add sales tax to my total

Last, create a proportion where the pre-tax value is proportional to 100% and solve for the percentage of sales tax.

How do i add sales tax to my total

Cross multiply and solve.

How do i add sales tax to my total

How do i add sales tax to my total

Isolate the sales tax percentage to the left side of the equation by dividing each side by the pre-tax value.

How do i add sales tax to my total

How do i add sales tax to my total

Round to two decimal places since our answer is in dollars and cents.

How do i add sales tax to my total

Last, we can check this answer by calculating the sales tax percentage of the total as seen previously.

First, we need to convert the sales tax percentage into a decimal by moving the point two spaces to the left.

How do i add sales tax to my total

Now, we need to multiply the pre-tax cost of this item by this value in order to calculate the sales tax cost.

How do i add sales tax to my total

How do i add sales tax to my total

Round to two decimal places since our total is in dollars and cents.

How do i add sales tax to my total

Last, add this value to the pre-tax value of the item to find the total cost.

How do i add sales tax to my total

How do i add sales tax to my total

How do i add sales tax to my total

Our answers check out; therefore they are correct. Now, let's use this information to solve the given problem.

Solution: 

There are two ways to do this.  The easiest way is to realize that the total cost is 107.5% of the price of the shirt.  This is like saying, "What is 107.5% of 44?"  

How do you add tax to a subtotal?

So, if your subtotal is $1,000 and you need to apply sales tax at 5 percent, multiply $1,000 by 0.05 to arrive at $50.

How do I add tax to a total in Excel?

Adding Sales Tax Directly to a Price Example.
Select the cell where you want the final sales price to appear..
Identify the cell containing the pretax amount (C4 in this example)..
Type the following formula: =C4*1.05..
Press Enter, and the amount including tax appears in the cell you selected for the final sales price..

How do you sum up tax?

Multiply the cost of an item or service by the sales tax in order to find out the total cost. The equation looks like this: Item or service cost x sales tax (in decimal form) = total sales tax. Add the total sales tax to the Item or service cost to get your total cost.