15% VAT calculator: adding and removing VAT, with examples

To add 15% VAT in Saudi Arabia, multiply the net price by 1.15. To remove it from a VAT-inclusive price, divide by 1.15; the VAT inside that price is the total × 15/115. This 15% VAT calculator guide gives the formulas, worked tables, ZATCA's rounding rules and the mistakes that cost halalas.

Saudi Arabia introduced VAT at the start of 2018 at a basic rate of 5%. The Ministry of Finance announced on 11 May 2020 that the rate would rise to 15%, and it has applied to standard-rated supplies made from 1 July 2020 [1]. A blog page cannot run an interactive calculator, so this guide gives you the arithmetic in a form you can check by hand or paste into a spreadsheet. It is general information, not tax advice.

The formulas behind a 15% VAT calculator

Every VAT calculator, from a shop's point-of-sale system to an accounting package, runs the same four formulas. ZATCA's guideline on the rate change gives the first and third directly: tax equals the value excluding VAT × 15%, or the VAT-inclusive amount × 15/115 [1]. The VAT Implementing Regulations state the general form in Article 45(2): tax = consideration × tax rate ÷ (100% + tax rate) [2].

ZATCA notes that the fraction 3/23 is identical to 15/115 and can be used instead [1]. For mental arithmetic, the VAT inside a total is a little over 13% of it (3 ÷ 23 ≈ 0.1304), and the net price is about 87% of the total. Use these shortcuts only to sanity-check a figure; let the formula, not the approximation, produce the invoice amount.

Adding VAT to a net price: worked table

Use this when you quote a price before VAT, as most business-to-business quotations do. Multiply the net amount by 0.15, round the VAT to the nearest halala, and add it to the net amount.

The last row is ZATCA's own example: a machinery supplier quoted SAR 1,345,000 excluding VAT and invoiced SAR 201,750 of VAT, for a total of SAR 1,546,750 [1].

Discounts come off before the VAT

VAT is calculated on the actual value of the supply after discounts, and the invoice should show the discount, the value after discount, the tax and the total [3].

Illustrative example. A trading company in Dammam quotes SAR 1,000 for a consignment and agrees a 10% discount. VAT is due on SAR 900, so the VAT is SAR 135 and the customer pays SAR 1,035. Calculating VAT on SAR 1,000 first and deducting the discount afterwards would overstate the tax by SAR 15.

How do you remove 15% VAT from a total?

Use this when a price already includes VAT, as shelf prices and menus shown to consumers in Saudi Arabia must (see the mistakes section below). Calculate the VAT inside the total with 15/115, round it to the nearest halala, then subtract it from the total to get the net. Working in that order means net and VAT always add back to the exact price the customer paid.

In ZATCA's car-repair example, the customer agreed a fixed SAR 200 including VAT. The workshop computed 200 × 15/115 = SAR 26.09, reported that as output tax and issued an invoice showing SAR 173.91 for the service and SAR 26.09 of VAT [1]. In the television example, a retailer chose a shelf price of SAR 3,899 including VAT, so its revenue on each set was SAR 3,390.43 and the VAT SAR 508.57 [1].

Calculating VAT at 15% on a mixed invoice

An invoice can mix standard-rated, zero-rated and exempt lines. Zero-rated supplies are taxable at 0%: ZATCA lists exports of goods and services, international transport, qualifying medicines and medical equipment, and investment metals among them [1]. Exempt supplies carry no VAT at all; ZATCA gives exempt financial services and exempt real estate supplies as examples [3], and real estate sales have been exempt since 4 October 2020 [1].

ZATCA's e-invoicing guideline describes a bank that charges a SAR 6,250 commission at 15% and a SAR 50,000 profit element that is exempt; if it issues one invoice for both, that invoice must meet tax invoice requirements [5]. The commission carries SAR 937.50 of VAT; the exempt line carries none.

Illustrative example. A medical supplies distributor in Riyadh issues one tax invoice to a clinic:

Two rules apply here. When every line is at 15%, VAT may be calculated on the invoice total; when lines carry different rates, it is calculated separately for each [3]. And where tax is not charged at the basic rate, the tax invoice must include a narration explaining the treatment applied [2]. Whether a particular item really qualifies for the zero rate is a legal question, not an arithmetic one; check ZATCA's guidance for your sector before you code it into your system.

VAT rounding rules: halalas, line totals and the one-halala drift

ZATCA's tax invoicing guideline, updated in May 2026, sets the basic rule. The VAT amount is shown in Saudi riyals and halalas; the unit price may be shown unrounded, but where the VAT or the taxable amount includes fractions of a halala, the VAT is rounded to the nearest halala. The rounded figures on the invoice must be the same ones used in the VAT return [3].

For e-invoices, ZATCA's XML Implementation Standard adds three rules: round half-up (a third decimal of 5 or more rounds up), round final results rather than intermediate ones, and round the VAT total for each category at document level rather than adding up rounded line amounts [4]. That last rule explains why two calculators can disagree by a halala.

Illustrative example. An invoice has three lines of SAR 10.10 each, all at 15%:

The document-level figure, SAR 4.55, follows the XML standard's rule [4]. Small differences of this kind are why an accountant's spreadsheet and an invoicing system can show different VAT on the same basket.

A second drift appears when a system stores a rounded net price and recalculates the total. A shelf price of SAR 59.99 including VAT gives a net of SAR 52.17. Add 15% back to SAR 52.17 and you get SAR 7.83 of VAT, for a total of SAR 60.00, one halala more than the advertised price. The fix: when your prices are VAT-inclusive, keep the inclusive price as the master figure and extract the VAT from it with 15/115, as ZATCA requires for retail sales [1].

A 15% VAT calculator in your spreadsheet

You can rebuild the calculator in Excel or Google Sheets in a minute. Put the amount in column A and use these formulas in row 2; ROUND keeps every figure to the halala.

Test the sheet against ZATCA's published figures before you rely on it: SAR 200 including VAT must give SAR 26.09 of VAT, and SAR 3,899 must give SAR 508.57 [1]. Then run the three-line SAR 10.10 example to see whether your invoicing software rounds by line or by document.

Common mistakes when you calculate VAT at 15%

Most VAT arithmetic errors fall into a handful of patterns, and each one is visible in an invoice review.

1. Taking 15% off the total. Multiplying a VAT-inclusive price by 0.85 does not remove VAT; it removes too much. The VAT is 15% of the net price, not of the total.

2. Adding VAT when you are not registered. Only a VAT-registered person may issue a tax invoice; anyone not registered who issues a document intended as a tax invoice, or collects an amount as VAT, faces a fine of up to SAR 100,000 [3][6]. Registration is mandatory once taxable supplies over 12 months exceed SAR 375,000, and voluntary registration is possible above SAR 187,500 [3].

3. Displaying prices before VAT to consumers. Retail prices shown on goods in shops must include VAT; ZATCA's guideline cites the GCC VAT Agreement's rule that the price displayed in the local market must include the tax [1]. ZATCA's VAT page likewise says a simplified invoice must be issued in Arabic and show the total price including VAT [7].

4. Calculating VAT before the discount. As above, the tax follows the value after discounts [3].

5. Showing the VAT only in a foreign currency. An invoice may be priced in dollars or euros, but the VAT amount must be stated in Saudi riyals, converted at the Saudi Central Bank's daily rate for the date the tax becomes due [3].

6. Applying 15% to zero-rated or exempt lines, or forgetting the narration that explains a non-standard treatment [2].

7. Rounding at every step. Round the VAT once per invoice category, not each intermediate figure, and keep the inclusive price as master for retail [4].

8. Using the old 5% on a current contract. The transitional exception that let some contracts signed before 11 May 2020 stay at 5% ended, at the latest, on 30 June 2021 [1]. Standard-rated supplies made today are at 15%.

What a VAT calculator cannot tell you

A calculator does arithmetic. It cannot tell you whether a supply is standard-rated, zero-rated, exempt or outside the scope of VAT, when the tax became due, or whether you must register. Those answers come from the VAT Law, its Implementing Regulations and ZATCA's guidelines. ZATCA's invoicing guideline also lists its contact number, 19993, and explains how to request a formal interpretative ruling for a specific transaction [3]. For your own case, check with ZATCA or a licensed tax advisor.

If you read VAT figures off scanned supplier invoices before entering them, errors creep in at the reading stage too; our guide to Arabic OCR for scanned PDFs covers how to check extracted numbers before they reach your books.

Your next step

Open a spreadsheet today and build the four formulas from this 15% VAT calculator guide, with ROUND to two decimals. Test them against ZATCA's figures (SAR 200 → SAR 26.09; SAR 3,899 → SAR 508.57), then put the same baskets through your point-of-sale or invoicing system and compare. If the figures differ by more than a halala, ask your provider how it rounds. If your business needs VAT logic built into its own systems, our guide to custom software development in Saudi Arabia explains when to buy and when to build; you can read about O AI, a software and AI company in Al Khobar, on our home page.