Norwegian Customs Changes How Exchange Rates Are Set in TVINN

What Importers and Exporters Need to Know

Starting in September 2026, the Norwegian Customs Authority (Tolletaten) is changing when it fixes the currency exchange rates used in TVINN, the national customs declaration system. 

It looks like a small technical adjustment, but in practice, it directly affects how far in advance businesses can prepare and submit accurate customs declarations. 

What is actually changing?

Today, Tolletaten sets its official currency conversion rates every Wednesday.

From 3 September 2026, this will move to a twice monthly (every other Tuesday) cycle. Under the new system, each set of rates will remain valid for two calendar weeks, starting from the third Thursday following the date the rates were fixed.

In short: rates will be set less frequently, but further in advance, giving businesses a longer, clearer window to plan declarations around known exchange rates instead of guessing at rates that haven’t been published yet.

The September 2026 transition period

Because the changeover falls mid-cycle, Tolletaten has published a short transitional schedule to bridge the old and new systems:

From October 2026 onward, the regular twice monthly Tuesday cycle takes full effect. That is why businesses with declarations spanning the transition dates above should double-check which rate applies. This is a kind of detail that is easy to miss, but can be costly to get wrong.

Why this matters for your business

For companies that import or export goods through Norway, the change brings three main benefits:

• Declarations can be filed earlier, since rates are known further in advance.
• The new timing better supports declaring up to 30 days before import.
• Businesses gain more predictability for planning around currency rates.

Tolletaten publishes official conversion rates for 22 currencies, all of which will follow this new cycle.

A built-in safety net – rate suspension

If a fixed rate deviates more than 5% from Norges Bank’s daily rate for two consecutive days, Tolletaten automatically suspends it, protecting businesses from being locked into an outdated rate during a turbulent currency period. Suspensions are announced on Tolletaten’s website, which means that declarants need to keep an eye on official announcements. 

The legal basis

The change is anchored in Norwegian regulation, specifically § 6-12-1 of the Vareførselsforskriften (the regulation on the movement of goods), which governs how conversion rates are determined for customs purposes.

With the new cycle taking effect from September 2026, it’s worth updating internal planning calendars to reflect the twice-a-month rate-setting schedule, and making sure anyone handling declarations in September knows about the transitional dates above. 

source: https://www.toll.no/no/bedrift/nyheter-for-naeringslivet/endring-i-fastsettelse-av-omregningskurser-i-tvinn