Start with three facts, not with the invoice
Before anything else, establish: whether the person is genuinely self-employed or is working as an employee would; where they are tax-resident; and whether the work is performed in Norway or from abroad. Every obligation below is decided by those three answers, in that order.
The invoice tells you none of them. A person can send a perfectly valid invoice from a company they own and still be, in substance, working under your direction on your equipment to your schedule — which is the description of an employment relationship, whatever the paperwork says.
The status question, which is not yours to answer casually
Norway distinguishes an employee (arbeidstaker), a freelancer (frilanser, formally an oppdragstaker) and a self-employed person (selvstendig næringsdrivende). The distinction turns on the substance of the working relationship — who directs the work, who carries the risk, who supplies the tools — and not on what the contract calls it. Altinn sets out the test in its guide for freelancers, and Skatteetaten's a-melding guide covers freelancers, contractors and fee recipients specifically.
This matters because the consequences of getting it wrong land on the payer. If the relationship is really employment, the withholding, the employer's contributions and the reporting were yours all along, and a reassessment collects them retrospectively.
Reporting: two different registers
Salary and fees paid to a person are reported monthly in the a-melding. Skatteetaten's guide to who is obliged to submit an a-melding is the place to check whether you are, and the answer is usually yes the moment you pay a person rather than a business.
Separately, an assignment to be performed in Norway or on the continental shelf, given to a business resident abroad or a person resident abroad, is reported to the Oppdrags- og arbeidsforholdsregisteret — historically the RF-1199 form, with RF-1198 covering the workers on the assignment. The report is due as soon as the contract is signed and no later than 14 days after the work in Norway begins; assignments under NOK 20,000 are exempt. Work a foreign freelancer performs from their own country never enters this register — for that case, the VAT duty below is the one that bites.
These are two separate duties with two separate deadlines. Filing one does not discharge the other, and the assignment register is the one that most often gets missed, because it has no monthly rhythm to remind you.
The VAT you charge yourself
When a Norwegian business buys a remote service — anything that could be delivered from anywhere, which covers most freelance work — from a supplier outside the Norwegian VAT area, the buyer calculates and reports the Norwegian VAT. The supplier's invoice will carry no Norwegian VAT and is not supposed to. The duty sits with you under merverdiavgiftsloven § 3-30.
A VAT-registered business usually deducts the same amount as input VAT in the same return, so the cash effect is nil. The reporting is not optional even then, and it is the omission rather than the money that gets assessed.
Foreign nationals working in Norway: the D-number
A person without a Norwegian national identity number needs a D-number before they can hold a tax card, and therefore before salary can be paid with the correct withholding. It is issued by Skatteetaten, and it requires the person to appear in person at one of the designated tax offices with a valid passport or national ID and documentation of the assignment.
That appointment is the long pole. Start it before the work does — not after the first invoice arrives and the payment is already late.
Where PayoutPartner fits
For work performed in Norway by a person without their own company, PayoutPartner is the oppdragsgiver: the freelancer is paid as salary, income tax is withheld against their tax card, employer's national insurance is calculated and paid, and the a-melding is filed. Your company receives one invoice and makes one payment.
That covers the withholding, the employer contributions and the monthly reporting in one arrangement. Two things stay yours: the VAT on services you buy directly from suppliers abroad, and the substance of the relationship itself — if a person works under your direction the way an employee does, no payment route changes what they are.