How to Calculate Tax from the Total Invoice Amount

Posted on :
4 November 2026

Author :
Toka Khaled

Reviewed By :
Mohamed Naeem

How to Calculate Tax from the Total Invoice Amount

Key Summary
How to Calculate Tax from the Total Invoice Amount
Does the Tax Calculation Method Vary Depending on the Type of Tax?
How Can I Calculate VAT in the Chart of Accounts?
2026 ZATCA Tax Return Filing Deadlines
From Personal Experience
Tips to Avoid Errors When Calculating Tax from the Total Invoice Amount
How to Calculate VAT on an Invoice Using Daftra
Frequently Asked Questions

In today’s business environment, it is not acceptable for a business owner or accountant to issue an invoice without having a clear understanding of how Value Added Tax (VAT) is calculated. This is essential to ensure compliance with tax laws and avoid penalties.

In this article, we will guide you through clear and straightforward steps for calculating tax from the total amount, with practical examples. We will also explain the difference between prices that are inclusive and exclusive of VAT.

Key Summary

VAT included in the total amount is not calculated by simply multiplying the total by 15%.
The amount before VAT can be calculated more quickly by dividing the total amount by 1.15 and then subtracting the result from the total amount to determine the VAT amount.
When the price is exclusive of VAT, 15% VAT is added to the net price.
The calculation method varies depending on the type of tax. Withholding Tax, for example, is calculated on the amount subject to withholding at the applicable rate.
Output Tax on sales must be separated from Input Tax on purchases and deductible expenses, and the difference between them must then be settled to determine the net tax due.
A monthly Tax Return is filed by establishments whose annual taxable supplies exceed SAR 40 million, while a quarterly Tax Return is filed by establishments whose annual taxable supplies do not exceed this threshold.
Separating net sales from VAT when recording invoices is important for preparing accurate financial reports, conducting account reviews, and filing the Tax Return correctly.

How to Calculate Tax from the Total Invoice Amount

Value Added Tax (VAT) is imposed on most goods and services in the Kingdom of Saudi Arabia at the standard rate of 15%. Sometimes, you may receive an invoice showing the total amount, including VAT, and need to determine the VAT amount and the net price, excluding VAT.

If you receive an invoice with a total amount that includes VAT, whether you are a business owner or an accountant, you may need to separate the VAT amount from the net price for various purposes, such as preparing financial reports, reviewing payments, or ensuring that the invoice complies with the Saudi tax system.

Calculating VAT from the total invoice amount is simple if you follow the correct steps. Below, we will show you how to determine the VAT amount and net price using clear steps, practical examples, and simple mathematical formulas:

1- Identify the Total Amount:

Find the total amount on the invoice, including VAT.

2- Confirm the Tax Rate:

In Saudi Arabia, the standard rate is 15% (or 0.15).

3- Calculate the VAT Amount:

Use the following formula:

VAT amount = Total amount × 15 / (100 + 15).

4- Calculate the Net Price:

Use the following formula:

Net price = Total amount × 100 / (100 + 15).

5- Verify the Calculation:

Make sure that the net price + VAT amount = the total amount.

Example

Suppose you receive an invoice for SAR 2,300, including VAT. Let’s calculate the VAT amount and net price:

Step 1: Calculate the VAT Amount

VAT amount = 2,300 × 15 / (100 + 15) = 2,300 × 0.130435 = SAR 300.

Step 2: Calculate the Net Price

Net price = 2,300 × 100 / (100 + 15) = 2,300 × 0.869565 = SAR 2,000.

Step 3: Verify the Calculation

SAR 2,000 (net price) + SAR 300 (VAT) = SAR 2,300. The calculation is correct!

Alternative Method (Simplified):

Looking for a faster method? You can use a simple calculator:

Divide the total amount by 1.15 to obtain the net price:
2,300 ÷ 1.15 = SAR 2,000.
Subtract the net price from the total amount to obtain the VAT amount:
2,300 - 2,000 = SAR 300.

Both methods give the same result, but the alternative method is faster when using a basic calculator.

You can use Daftra’s Tax Calculator to calculate the VAT amount automatically and completely free of charge.

Does the Tax Calculation Method Vary Depending on the Type of Tax?

In Saudi Arabia, Value Added Tax (VAT) is the primary type of tax applied to most goods and services at the standard rate of 15%. However, the calculation method may vary depending on the type of tax or the exemptions that apply. Let’s review the different types of taxes and how each is calculated:

1- Tax Exclusive of VAT

In some cases, an invoice may be issued without including Value Added Tax (VAT), and you may need to add it to the net amount. In this case, you can use a simple formula to calculate the tax:

Tax amount = Net amount × Tax rate / 100

Total amount = Net amount + Tax amount

Example:

Suppose you have an invoice for a net amount of SAR 1,000 and want to add Value Added Tax (VAT) at 15%:

Tax amount:

1,000 × 15 / 100 = SAR 150

Total amount:

1,000 + 150 = SAR 1,150

2- VAT Inclusive

This is the case we discussed earlier, where VAT is included in the total invoice amount. Use the following formulas:

Tax amount = Total amount × 15 / 115

Net amount = Total amount × 100 / 115

Example:

Suppose you receive an invoice for SAR 4,600, including VAT at 15%.

VAT amount:

4,600 × 15 ÷ 115 = SAR 600

Amount before VAT:

4,600 × 100 ÷ 115 = SAR 4,000

3- Withholding Tax

Withholding Tax is imposed on certain payments, such as payments for services provided by non-residents in Saudi Arabia, including consulting or technical services. Its rates range from 5% to 20%, depending on the type of service. To calculate it from the total amount:

Tax amount = Total amount × Tax rate ÷ 100

Net amount transferred to the supplier = Total amount - Tax amount

Example:

Suppose you pay SAR 10,000 for a consulting service provided by a non-resident that is subject to Withholding Tax.

The Withholding Tax amount would be:

10,000 × 15% = SAR 1,500

Net amount = 10,000 - 1,500 = SAR 8,500

4- Excise Tax

Excise Tax is imposed on certain goods, such as tobacco products (100%), soft drinks (50%), and energy drinks (100%). To calculate it from the total amount:

Tax amount = Total amount × Tax rate / (100 + Tax rate)

Net amount = Total amount × 100 / (100 + Tax rate)

Example:

An invoice for soft drinks worth SAR 230, including 50% tax:

Tax amount:

230 × 50 / (100 + 50) = SAR 76.67

Net amount:

230 × 100 / 150 = SAR 153.33

How Can I Calculate VAT in the Chart of Accounts?

VAT can be accounted for in the chart of accounts by creating separate accounts for VAT on purchases and expenses (Input Tax) and VAT on sales (Output Tax), and then reconciling the two at the end of the tax period.

For example:

If the VAT on your business's sales during the period is SAR 30,000, and the deductible VAT on its purchases and expenses is SAR 18,000, the net VAT payable is calculated as follows:

30,000 - 18,000 = SAR 12,000

Therefore, your business must pay SAR 12,000 as net VAT for the period. The effect of the reconciliation appears in the chart of accounts by closing the Input Tax balance against the Output Tax balance, thereby recognizing the net amount payable in a separate VAT Payable account, as follows:

Account	Debit	Credit
VAT on Output tax	30,000
VAT on Input tax		18,000
VAT Payable		12,000

2026 ZATCA Tax Return Filing Deadlines

Monthly Tax Return

A monthly Tax Return is filed by establishments whose annual taxable supplies exceed SAR 40 million. The Tax Return must be filed for each month by the deadline specified by the Authority, which is generally the last day of the following month.

For example, the deadline for filing the Tax Return for April 2026 was May 31, 2026.

Quarterly Tax Return

A quarterly Tax Return is filed by establishments whose annual taxable supplies do not exceed SAR 40 million. The establishment must file the Tax Return after the end of each quarter. For example, the deadline for filing the Tax Return for the first quarter of 2026 was April 30, 2026.

The Zakat, Tax and Customs Authority (ZATCA) allows VAT-registered establishments to submit a request to change their VAT return filing period from monthly to quarterly or vice versa, subject to ZATCA's approval.

Withholding Tax

Withholding Tax statements are filed monthly, as this differs from VAT. For example, the Authority set May 10, 2026, as the deadline for filing the Withholding Tax statement for April 2026.

The deadline is generally the tenth day of the following month and may change if it falls on an official holiday. ZATCA's current guidance states that the monthly Withholding Tax statement and payment of the withheld amount are due within the first 10 days of the month following the month in which the payment was made.

From Personal Experience

Based on a real situation I encountered while working as an accountant at a Saudi company, I faced an issue while reviewing a large number of invoices whose prices included VAT. The company dealt with a large number of customers and issued many invoices every day, so it was very important to ensure that each invoice was recorded with the correct amount and that the VAT amount was separated from the net sales amount.

The Problem

The problem began when I noticed during the review process that some VAT-inclusive invoices had been recorded with their total amounts treated as the sales amount before VAT, instead of separating VAT from the net invoice amount. As more invoices were recorded this way, differences appeared in the sales and tax balances, making it more difficult to review the total VAT payable, especially with a large number of invoices requiring review.

Initially, I tried to resolve the differences by reviewing the invoices and manually calculating the VAT amount. However, this method was time-consuming and increased the possibility of repeating the error when new invoices were recorded.

The Solution

At that point, I realized that the problem was not with calculating the VAT on a single invoice, but with the need to organize how VAT-inclusive invoices were handled from the moment they were recorded. Therefore, I used Daftra to help me organize the process of issuing and recording invoices. When preparing an invoice and setting its prices as VAT-inclusive, Daftra helps separate the VAT amount from the net invoice amount according to the specified tax settings, rather than relying on manual calculations for each invoice.

The Result

As invoices continued to be recorded this way, it became easier to track total sales separately from VAT and review the data recorded during the tax period, instead of manually recalculating the VAT amount on a large number of invoices when preparing the Tax Return.

Based on my experience, the most important change was that I no longer treated a VAT-inclusive invoice as merely a total amount. Instead, the sales amount and VAT amount were clearly separated, which made the review, reconciliation, and preparation of the data required for the Tax Return easier.

Tips to Avoid Errors When Calculating Tax from the Total Invoice Amount

You may have previously calculated VAT only to discover a small error that caused significant discrepancies in your financial reports. Errors in calculating tax from the total invoice amount may seem minor, but they can lead to penalties from the Zakat, Tax and Customs Authority (ZATCA) or complications in your accounting records. Here are some practical tips to help ensure the accuracy of your tax calculations:

Make sure that the invoice uses the standard VAT rate of 15%, as there may be exceptions, such as zero-rated supplies.
Is the total amount inclusive or exclusive of VAT? Ask the supplier if you are not sure.
Keep a paper or digital record to track your calculations, especially if you manage multiple invoices.
If you deal with a large number of invoices, consider using accounting software such as Daftra to reduce errors.

How to Calculate VAT on an Invoice Using Daftra

Do you find that calculating Value Added Tax (VAT) manually takes too much time and effort? When you use Daftra's invoicing software to issue your invoices, you no longer need to calculate VAT manually. The system automatically calculates VAT accurately in accordance with the applicable standards in Saudi Arabia.

Go to the Sales section in the system, then click Create New Invoice.
Select the customer and enter the products or services in the invoice table. You can then select the tax type to be applied to each line item using the designated field in the invoice.
If the products or services you add have already been configured with a tax type, the system will apply it automatically. Daftra displays the calculated tax amount for each line item, along with the total VAT amount at the bottom of the invoice. This helps you issue accurate invoices that comply with the requirements of the Zakat, Tax and Customs Authority (ZATCA).

Calculating VAT from the total invoice amount in Saudi Arabia is not complicated once you understand the basic steps and formulas. Whether you calculate it manually using the formulas explained in this article or use accounting software, the goal is to ensure accuracy and compliance with ZATCA regulations. Always verify your calculations and maintain accurate records to avoid legal issues.

Frequently Asked Questions

How Can I Calculate VAT at 5%?

The standard VAT rate in Saudi Arabia is 15%, not 5%, for taxable supplies.

To calculate VAT on an amount that includes VAT, use the following formula:

VAT amount = Total amount × 15 ÷ 115

If the amount excludes VAT, use this formula:

VAT amount = Amount before VAT × 15 ÷ 100

The 5% rate is no longer the standard VAT rate in Saudi Arabia, as the rate was increased to 15% effective July 1, 2020.

Why Do You Need to Know How to Calculate Tax from the Total Invoice Amount?

You need to know how to calculate tax from the total invoice amount to determine the VAT amount separately from the price of the goods or services. This helps you record invoices correctly, separate sales revenue from VAT, and accurately review accounting records and Tax Returns.

How Can I Check VAT Registration Status?

You can check whether an establishment is registered for VAT through the verification service provided by the Zakat, Tax and Customs Authority (ZATCA). The service allows you to search using the Tax Identification Number, VAT Registration Certificate number, or Unified Commercial Registration Number.

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How to Calculate Tax from the Total Invoice Amount

Table of contents:

Key Summary