Formulas used
Adding VAT: VAT = DPP × rate, and total = DPP + VAT, where DPP (the tax base) is the price after discount. Separating VAT from a tax-inclusive price: DPP = price ÷ (1 + rate), and VAT = price − DPP. Example at an 11% rate: a VAT-inclusive price of Rp111,000 means a DPP of Rp100,000 and VAT of Rp11,000.