Discount calculator

The price after a discount, the saving, and two offers stacked, in SAR.

How a discount is worked out

A percentage discount takes that share off the price: the saving is the price × the percent ÷ 100, and what is paid is the price less the saving. A fixed discount simply comes off the price. The calculator shows both the saving and the final price, and the discount as one percentage of the original, which is what matters when two offers are stacked.

A worked example: two offers on one item

A shelf price of SAR 200.00 carries a 15% sale discount, and a loyalty card takes a further 10% off at the till. The second percent is taken of what the first left, not of the shelf price, so the two together are 23.5%, not 25%.

Sale: 15% of 200.0030.00 off → 170.00
Card: 10% of 170.0017.00 off → 153.00
Paid153.00
Saved47.00 (23.5% of 200.00)

Discounts on an invoice

On a tax invoice a discount is shown before VAT: the taxable amount is the price less the discount, and VAT is charged on that. A 15% discount on SAR 200.00 leaves a taxable 170.00, VAT at 15% is 25.50, and the total is 195.50. Giving the discount on the VAT-inclusive total instead changes the VAT charged, which the authority's rules do not allow.

Aqid ERP takes a discount per line or on the whole document, applies it before VAT, prints it on the invoice and carries it into the VAT return.

Questions

How do I calculate a 15% discount?

Multiply the price by 15 and divide by 100 for the saving, then take it off the price. On 200.00 the saving is 30.00 and the price to pay is 170.00.

How do I find the price after a discount?

Multiply the price by (100 − the percent) ÷ 100. After 15%, that is price × 0.85: 200.00 × 0.85 = 170.00.

Two discounts of 15% and 10%: is that 25% off?

No. The second is taken of what the first left: 200.00 → 170.00 → 153.00, which is 23.5% off the original. Discounts stack by multiplying, not by adding.

How do I work out the original price from the discounted one?

Divide the discounted price by (100 − the percent) ÷ 100. If 170.00 is the price after 15%, the original was 170.00 ÷ 0.85 = 200.00.

Is a discount applied before or after VAT?

Before. VAT is charged on the price less the discount. A discount given on a VAT-inclusive total would understate the VAT, which the tax authority's invoice rules do not permit.

Can I enter a fixed amount instead of a percent?

Yes. Choose "Amount off", enter the amount, and the calculator shows the final price and what the discount is as a percentage of the original.

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