Pre-Tax vs Post-Tax Price: How to Tell Which Amount You Have

A receipt, invoice, quote, or online store may show several prices:

Subtotal
Net amount
Taxable amount
Tax
Gross amount
Total
Amount paid
Balance due

Before calculating tax or removing tax from a price, you need to identify whether the number is a pre-tax price or a post-tax price.

A pre-tax price is the amount before tax is added. A post-tax price is the amount after tax is included.

For example:

Pre-tax price: 100.00
Tax rate: 10%
Tax amount: 10.00
Post-tax price: 110.00

The difference may appear simple, but using the wrong number can reverse the direction of the calculation and produce an incorrect result.

For a more complete comparison of common labels, document examples, and reverse-tax decisions, read the detailed Pre-Tax vs Post-Tax Price guide.

What Is a Pre-Tax Price?

A pre-tax price is the amount before sales tax, VAT, GST, HST, or another transaction tax is added.

It is commonly used as the base for calculating tax.

Depending on the receipt, invoice, or pricing system, it may be called:

Price before tax
Subtotal before tax
Taxable subtotal
Net price
Net amount
Tax-exclusive price
Amount excluding VAT
Amount excluding GST

Suppose an item has a pre-tax price of 200.00 and the tax rate is 8%.

Calculate the tax:

200.00 × 8% = 16.00

Add the tax:

200.00 + 16.00 = 216.00

The pre-tax price is 200.00.

What Is a Post-Tax Price?

A post-tax price is the amount after tax has been added or included.

It may also be described as:

Price after tax
Final price
Tax-inclusive price
Gross price
Total including tax
VAT-inclusive amount
GST-inclusive amount
Receipt total

Using the previous example:

Pre-tax price: 200.00
Tax: 16.00
Post-tax price: 216.00

The post-tax price contains both the original price and the tax.

Pre-Tax and Post-Tax Price Comparison

Feature	Pre-tax price	Post-tax price
Includes tax	No	Yes
Used as tax base	Usually yes	No
Common receipt label	Subtotal	Total
Common invoice label	Net amount	Gross amount
Forward-tax starting point	Yes	No
Reverse-tax starting point	No	Yes
Typical customer payment	Not necessarily	Usually
Formula direction	Add tax	Remove included tax

The exact wording varies between receipts and countries, so the surrounding labels should always be checked.

How Pre-Tax and Post-Tax Prices Are Connected

The relationship is:

Post-tax price = Pre-tax price + Tax

The tax amount is:

Tax = Pre-tax price × Tax rate

Combining the two gives:

Post-tax price = Pre-tax price × (1 + Tax rate)

When the rate is entered as a decimal, an 8% rate becomes 0.08:

Post-tax price = Pre-tax price × 1.08

For example:

100.00 × 1.08 = 108.00

The post-tax price is 108.00.

How to Calculate a Post-Tax Price

When you know the pre-tax price and rate, multiply by the tax multiplier.

Use:

Post-tax price = Pre-tax price × (1 + Tax rate)

Suppose:

Pre-tax price: 150.00
Tax rate: 10%

Calculate the multiplier:

1 + 0.10 = 1.10

Calculate the post-tax price:

150.00 × 1.10 = 165.00

The tax amount is:

165.00 - 150.00 = 15.00

How to Calculate a Pre-Tax Price

When the starting price already includes tax, use reverse tax.

Use:

Pre-tax price = Post-tax price ÷ (1 + Tax rate)

Suppose:

Post-tax price: 165.00
Tax rate: 10%

Calculation:

165.00 ÷ 1.10 = 150.00

Included tax:

165.00 - 150.00 = 15.00

The calculation reverses the multiplier that originally added tax.

Why You Should Not Subtract the Tax Percentage

Suppose a post-tax price of 110.00 includes 10% tax.

A common mistake is:

110.00 × (1 - 10%) = 99.00

The correct pre-tax price is 100.00.

The incorrect method removes 10% of the post-tax price:

110.00 × 10% = 11.00

However, the original tax was calculated from the pre-tax price:

100.00 × 10% = 10.00

The tax rate applies to the pre-tax base, not the final post-tax total.

To recover the original price, divide by 1.10:

110.00 ÷ 1.10 = 100.00

Common Labels for Pre-Tax Prices

These labels often indicate a price before tax:

Subtotal
Taxable subtotal
Net amount
Net selling price
Amount before tax
Price excluding tax
VAT-exclusive price
GST-exclusive price

However, the label alone is not always enough.

A subtotal may include:

Discounts
Service charges
Shipping
Exempt products
Multiple product categories

Check whether a separate tax line appears after the subtotal.

Common Labels for Post-Tax Prices

These labels often indicate a price after tax:

Total
Grand total
Total including tax
Gross amount
Tax-inclusive price
VAT-inclusive total
GST-inclusive total
Final amount
Amount payable

Be careful with labels such as “amount due” or “total paid.”

They may include or reflect:

Deposits
Gift-card payments
Credits
Tips
Previous payments
Outstanding balances

The final payment figure is not always the original post-tax selling price.

Example: Reading a Basic Receipt

Suppose a receipt shows:

Line	Amount
Subtotal	100.00
Tax at 8%	8.00
Total	108.00

The receipt can be interpreted as:

Pre-tax price: 100.00
Tax amount: 8.00
Post-tax price: 108.00

No reverse calculation is required because all three values are already shown.

You can still verify the receipt:

100.00 × 8% = 8.00

100.00 + 8.00 = 108.00

Example: Receipt Shows Only the Final Total

Suppose a receipt shows:

Total including tax: 216.00
Tax rate: 8%

The pre-tax price is not displayed.

Reverse the post-tax amount:

216.00 ÷ 1.08 = 200.00

Calculate the included tax:

216.00 - 200.00 = 16.00

The estimated breakdown is:

Pre-tax price: 200.00
Included tax: 16.00
Post-tax price: 216.00

Example: Online Price With Tax Added at Checkout

Suppose an online store lists a product at 100.00 and says:

Taxes calculated at checkout.

The displayed 100.00 is likely a pre-tax price.

At an 8% rate:

100.00 × 1.08 = 108.00

The post-tax checkout price becomes 108.00.

Do not reverse the listed 100.00 price because tax has not yet been included.

Example: Online Price Says VAT Included

Suppose an online store lists a product at 120.00 and says:

VAT included at 20%.

The displayed amount is a post-tax price.

Calculate the pre-tax price:

120.00 ÷ 1.20 = 100.00

Included VAT:

120.00 - 100.00 = 20.00

Pre-Tax vs Post-Tax on an Invoice

An invoice may use different terminology from a retail receipt.

For example:

Invoice line	Amount
Net amount	500.00
VAT at 20%	100.00
Gross amount	600.00

In this example:

Net amount is the pre-tax price.
VAT is the tax amount.
Gross amount is the post-tax price.

However, some invoices also show:

Deposits
Credits
Retainers
Previous payments
Remaining amount due

A balance due after a deposit should not automatically be treated as the post-tax transaction price.

Pre-Tax vs Post-Tax on a Quote

A business quote may state:

1,000.00 plus applicable tax
1,000.00 excluding VAT
1,000.00 before GST
1,000.00 tax included

These phrases do not mean the same thing.

“Plus applicable tax”

The amount is pre-tax.

“Tax excluded”

The amount is pre-tax.

“Tax included”

The amount is post-tax.

“VAT inclusive”

The amount is post-tax.

Always confirm whether the customer will pay additional tax later.

Which Price Should You Enter Into a Reverse Tax Calculator?

Use a post-tax price when your goal is to find:

Price before tax
Included tax
Tax portion of a final total

Do not enter a pre-tax subtotal into a reverse calculator.

For example, if 100.00 is already before tax and the rate is 8%, entering it into a reverse calculator would produce approximately 92.59.

That would incorrectly remove tax from a number that did not contain tax.

Use the post-tax total of 108.00 instead:

108.00 ÷ 1.08 = 100.00

Which Price Should You Enter Into a Forward Tax Calculator?

Use the pre-tax price when your goal is to find:

Tax amount to add
Expected checkout total
Final invoice amount
Post-tax selling price

For example:

Pre-tax price: 100.00
Rate: 8%

Forward calculation:

100.00 × 1.08 = 108.00

Entering 108.00 into a forward calculator would add tax a second time.

Decision Table

What you have	What you want	Calculation
Pre-tax price and rate	Post-tax price	Multiply by one plus the rate
Post-tax price and rate	Pre-tax price	Divide by one plus the rate
Pre-tax and post-tax prices	Tax amount	Subtract
Post-tax price and shown tax	Pre-tax price	Subtract the shown tax
Pre-tax price and tax amount	Post-tax price	Add
Total only, no rate	Pre-tax price	More information is needed
Mixed-rate total	Pre-tax breakdown	Separate the rate groups

Why the Final Number Is Not Always the Post-Tax Price

The final line on a document may represent:

Remaining balance
Amount charged to a card
Refund due
Deposit balance
Marketplace payout
Customer credit
Total after gift-card use

These figures can differ from the original post-tax selling price.

Suppose an invoice shows:

Pre-tax price: 100.00
Tax: 8.00
Invoice total: 108.00
Deposit paid: 30.00
Balance due: 78.00

The post-tax price is 108.00.

The 78.00 figure is only the remaining payment balance.

Reverse-taxing 78.00 would not recover the original transaction price.

What If the Transaction Contains Exempt Items?

Suppose a receipt contains:

Taxable items: 108.00 including 8% tax
Exempt item: 50.00
Total: 158.00

The complete 158.00 is a post-purchase total, but it is not one clean post-tax amount at 8%.

Reverse only the taxable portion:

108.00 ÷ 1.08 = 100.00

The receipt consists of:

Taxable pre-tax price: 100.00
Included tax: 8.00
Exempt item: 50.00
Final receipt total: 158.00

Do not divide the full receipt by 1.08.

What If Different Rates Apply?

Suppose a receipt contains:

108.00 including 8% tax
120.00 including 20% tax

The complete receipt total is 228.00, but the two amounts were created with different multipliers.

Calculate separately:

108.00 ÷ 1.08 = 100.00

120.00 ÷ 1.20 = 100.00

Combined result:

Pre-tax total: 200.00
Included tax: 28.00
Post-tax receipt total: 228.00

One post-tax payment may contain several tax groups.

How Discounts Affect the Price Labels

Suppose a product originally costs 100.00.

A 10.00 discount reduces the taxable price to 90.00.

At an 8% rate:

90.00 × 1.08 = 97.20

The transaction now contains several price concepts:

Original listed price: 100.00
Discounted pre-tax price: 90.00
Tax: 7.20
Post-tax price: 97.20

Reverse-taxing 97.20 returns 90.00, not the original 100.00 list price.

The calculation recovers the taxable base used in the completed transaction.

Shipping, Tips, and Service Fees

A post-tax payment can include more than product price and tax.

It may also include:

Shipping
Delivery fees
Service charges
Booking fees
Handling fees
Optional tips
Deposits

Some of these amounts may be taxable, while others may not be.

Before applying one rate to the total, determine whether every component belongs to the same taxable group.

Why Rounding Can Create a Small Difference

Suppose a post-tax price of 100.00 includes 7% tax.

Calculate the pre-tax price:

100.00 ÷ 1.07 = 93.457943...

Rounded to two decimal places:

93.46

Included tax:

100.00 - 93.46 = 6.54

A receipt system may calculate and round tax separately for each product.

A calculator may reverse the combined total and round only once.

These methods can sometimes differ by one cent.

A small discrepancy may reflect rounding order rather than an incorrect price classification.

Pre-Tax and Post-Tax Spreadsheet Formulas

Suppose:

A2 contains the pre-tax price
B2 contains the tax rate

Calculate the post-tax price

=A2*(1+B2)

Suppose:

C2 contains the post-tax price
B2 contains the rate

Calculate the pre-tax price

=C2/(1+B2)

Calculate the included tax

=C2-(C2/(1+B2))

If the rate is stored as the whole number 8 instead of 8%, use:

=C2/(1+B2/100)

Pre-Tax vs Post-Tax Checklist

Before calculating, confirm:

Does the number already include tax?
Is the rate known?
Does one rate apply to the entire amount?
Are any products exempt or zero-rated?
Are shipping, tips, or service fees included?
Is the number a transaction total or only a payment balance?
Did a discount change the taxable base?
Does the document show tax separately?
Are you adding tax or removing included tax?
Does your result rebuild the original amount?

Calculate the Pre-Tax Portion of a Final Price

When you have a clean post-tax amount with one known rate, use the free Reverse Tax Calculator.

Enter the tax-inclusive total and rate to calculate:

Pre-tax price
Included tax
Tax multiplier
Calculation breakdown

For mixed-rate or partly exempt receipts, separate each taxable group first.

Final Takeaway

A pre-tax price excludes tax.

A post-tax price includes tax.

Use the pre-tax price when adding tax:

Pre-tax price × (1 + Rate) = Post-tax price

Use the post-tax price when removing included tax:

Post-tax price ÷ (1 + Rate) = Pre-tax price

Most mistakes happen because the wrong number is entered into the right formula.

Before calculating, read the labels, identify whether tax is already included, and separate any amounts that do not share the same tax treatment.

For additional examples and document-label guidance, read the complete Pre-Tax vs Post-Tax Price resource.