How amounts are calculated
The issuance amount of a tax invoice is the sum of the amounts of all items. An issuance request also carries the tax type (taxType). The tax type determines how the per-item tax (items[].tax) is entered.
Within a single issuance request, enter every item’s tax according to the tax type. The request is rejected if you mix actual tax amounts with
null or omitted fields, or send a non-zero tax for a zero-rate invoice.Input examples by tax type
Calculation example
The following is an example of issuing a total of KRW 220,000. Tax invoice total
Per-item breakdown
Input limits
The API rejects requests that exceed the input limits below.
If you enter the recipient manager’s mobile phone number, a KakaoTalk notification (AlimTalk) is sent to announce receipt of the tax invoice.
Unsupported characters
The NTS electronic tax invoice standard disallows certain characters. Bolta handles them in two ways. Characters Bolta removes Bolta strips invisible characters as soon as it receives the request, then continues with issuance. This covers control characters, format characters such as the zero-width space (U+200B) and the BOM (U+FEFF), unpaired surrogates, and noncharacters ending in U+FFFE or U+FFFF. Tabs, line feeds, and carriage returns are control characters, but Bolta keeps them. Values copied from a spreadsheet or a web page often carry these characters. Bolta counts the character limits above after removal, so the text on the issued tax invoice can differ from the value you sent. Characters that fail the request Bolta does not strip characters above U+FFFF. It rejects the request instead. Emoji and some CJK extension ideographs fall in this range. The API returns400 with a message that starts with 세금계산서 입력에 지원하지 않는 문자가 포함되어 있습니다. and appends the failing input path and code points in brackets. The message reports one input at a time. Remove the characters from that value and send the request again.
Both rules apply to standard issuance, reverse issuance requests, and Change in Supply Cost amendments.