When adding products to opencart sites, they must calculate and enter the prices of the products excluding VAT.
In the Opencart system, VAT is added to the price entered, but this is especially annoying for those who sell retail products, because no e-commerce site sells its products as price + VAT, on the contrary, it writes the price including VAT in a rounded form.
With the Opencart VAT calculation module, the price is entered as 20TL including VAT, and as soon as the VAT rate is selected, the module calculates and creates the figure excluding VAT.