I open an office sofa 2600 invoice need a lot of tax
You open VAT ordinary invoice is 2600 * 3% = 78 you open VAT ordinary invoice is 2600 * 6% = 156
You open VAT ordinary invoice is (2600-2000) * 3% = 18 you open VAT ordinary invoice is (2600-2000) * 6% = 36
For example, you 2600 billing, purchase price is 2000, a VAT invoice (6%)