# stdnum.nl.btw

BTW-nummer (Omzetbelastingnummer, the Dutch VAT number).

The BTW-nummer is the Dutch number for VAT. It consists of a RSIN or BSN followed by a B and two digits that identify the unit within the organisation (usually 01).

    >>> validate('004495445B01')
    '004495445B01'
    >>> validate('NL4495445B01')
    '004495445B01'
    >>> validate('123456789B90')
    Traceback (most recent call last):
        ...
    InvalidChecksum: ...

`stdnum.nl.btw.``compact`(number)

  Convert the number to the minimal representation. This strips the number of any valid separators and removes surrounding whitespace.

`stdnum.nl.btw.``is_valid`(number)

  Check if the number is a valid BTW number.

`stdnum.nl.btw.``validate`(number)

  Check if the number is a valid BTW number. This checks the length, formatting and check digit.