Trekktabeller API

Slå opp forskuddstrekk fra Skatteetatens trekktabeller. A REST API for Norwegian withholding-tax deduction tables.

Given a table number, a period, a table type and an income, the API returns the withholding amount (trekk). Data is fixed for the tax year, so single lookups are cacheable at the edge.

Base URL

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Endpoints

GET/api/v1/trekk

Single lookup. All four query parameters are required.

Param	Values	Meaning
`tabell`	e.g. 7100	Table number (tabellnummer)
`periode`	1–7	1=month, 2=14 days, 3=week, 4=4 days, 5=3 days, 6=2 days, 7=1 day
`type`	0 or 1	0=lønn (salary), 1=pensjon (pension)
`grunnlag`	e.g. 45000	Income basis (trekkgrunnlag)

…

{
  "tabellnummer": 7100,
  "trekkperiode": 1,
  "trekkperiodeNavn": "måned",
  "tabelltype": 0,
  "tabelltypeNavn": "lønn",
  "grunnlag": 45000,
  "matchetGrunnlag": 45000,
  "trekk": 12345,
  "overTabell": false
}

matchetGrunnlag is the bracket the income matched; overTabell: true means the income exceeds the highest tabulated bracket (beyond it an excess percentage applies, which is not part of this dataset). Income below the lowest bracket returns trekk: 0. An unknown table/period/type combination returns 404; invalid parameters return 400.

POST/api/v1/trekk/batch

Batch lookup (up to 1000 items) — for resolving many at once.

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Returns { "resultater": [ … ] } in input order; each entry carries a funnet (found) flag.

GET/api/v1/tabeller

Lists the available table numbers plus the period/type enumerations.

GET/health

Returns { "status": "ok" }.

Base URL

Endpoints

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