Starting a company in Oslo involves several steps. First, you'll need to register your business with the Brønnøysund Register Centre (brreg.no), which is the central business registry in Norway. This can often be done online and requires details about your company's name, business activities and ownership structure. Additionally, if you need information and support regarding employment, social security and benefits for employees and businesses, make sure to contact the Norwegian Labour and Welfare Administration (NAV) (nav.no).

For taxes and accounting, it's advisable to hire a local accountant or accounting firm familiar with Norwegian tax laws and regulations. They will assist with tax filings, financial statements and other compliance requirements. To open a business bank account, you can approach local and international banks in Oslo, which offer business banking services. Be prepared to provide the necessary business registration documents and identification.