ANOTHER ARTICLE TO DO Next we create as: The 90 percent rule in Norway – when does a Pole have the right to full deductions?

You work several months in Norway, live in Poland and earn most of your annual income here. In such a situation the 90 percent rule in Norway can determine whether, in a regular tax assessment, you will receive full Norwegian deductions or whether they will be proportionally limited. The difference can be measured in thousands of kroner, so it is worth knowing not only what the 90 percent rule is, but above all how to calculate it correctly.

What is the 90 percent rule in Norway?

The rule applies primarily to people who live in another EU/EEA country, for example Poland, and have limited tax liability in Norway.

If at least 90 percent of the relevant income is taxed in Norway, you may, under certain conditions, claim deductions in a manner similar to a person who is a Norwegian tax resident.

In practice this can mean, among other things, the right to full:

• personal allowance,

• standard deduction,

• and, in appropriate situations, also other ordinary deductions.

Without applying this rule some amounts may be limited proportionally to the number of months during which you were subject to taxation in Norway.

And this is where a big difference can arise.

Who does the 90 percent rule apply to?

The simplest example is a person who:

• is a tax resident in Poland,

• comes to Norway to work,

• does not become a Norwegian tax resident,

• is subject to limited tax liability in Norway,

• is taxed under the ordinary tax rules, not under the PAYE system,

• has most of the relevant annual income taxed in Norway.

The last point is crucial.

It is not enough to work in Norway.

You still need to check the income proportion.

Which incomes count for the 90 percent test?

For the basic test concerning the right to ordinary deductions Skatteetaten takes into account income from:

• employment,

• pensions,

• disability benefits,

• business activity.

It essentially compares income before deductions earned in each country.

So you can most simply think of it like this:

income taxed in Norway ÷ relevant total income × 100

If the result is at least 90 percent, the basic condition may be met.

But note: for some specific deductions the rules are broader. We will return to this when discussing credits.

Example: Adam works in Norway, but also earned some income in Poland

Adam lives in Poland.

In Norway he earned during the year:

240 000 NOK

In Poland, before leaving, he earned income corresponding to:

20 000 NOK

For simplicity we assume these are the only incomes considered in this test.

Total:

260 000 NOK

Income taxed in Norway:

240 000 NOK

We calculate:

240 000 ÷ 260 000 × 100 = about 92.3 percent

Adam therefore exceeds the 90 percent threshold.

If he meets the remaining conditions, he can benefit from the extended right to deductions.

Now let's change just one number.

Assume that Adam earned in Poland not 20 000 NOK, but the equivalent of:

30 000 NOK.

The total income is then:

270 000 NOK.

We calculate:

240 000 ÷ 270 000 × 100 = about 88.9 percent

Adam falls below 90 percent.

A few thousand kroner of additional income outside Norway can therefore change the way the tax return is handled.

Why is the 90 percent rule so important for short-term work?

If a person has limited tax liability in Norway only for part of the year, some standard amounts are normally reduced proportionally.

In 2026, the full personal allowance amounts to:

114 540 NOK.

The maximum standard deduction from wages amounts to:

95 700 NOK.

However, if an employee has limited tax liability for only four months and does not meet the condition allowing full values to be applied, the maximum standard deduction for four twelfths amounts to:

31 900 NOK.

That is why a person working only a few months can feel the 90 percent rule much more strongly than someone working in Norway all year.

Full deductions do not mean “you can deduct everything”

This is a very important distinction.

Meeting the 90 percent rule does not mean that you can suddenly deduct every expense incurred in Poland or Norway.

It primarily means that you can benefit from most ordinary deductions under the rules applied to persons taxed as residents of Norway, provided you meet the conditions of the specific deduction.

Each deduction still has its own rules.

For example:

• the full standard deduction does not require presenting receipts for every zloty or krone,

• the personal allowance is a standard element of the tax return,

• the parental deduction requires meeting separate conditions,

• interest on loans has its own rules,

• travel expenses or commuter status also need to be assessed separately.

The 90 percent rule opens the door.

However, it does not mean that every deduction behind that door is automatically due to you.

Are you married? Your spouse's income can change everything

This is one of the most frequently overlooked elements.

If you are married, Skatteetaten, when assessing the basic 90 percent rule, takes into account the combined incomes of the spouses.

Let's look at an example.

Piotr works in Norway and earns:

300 000 NOK.

He does not have other income.

His wife lives and works in Poland. Her income, after conversion, amounts to:

100 000 NOK.

Together the spouses have:

400 000 NOK.

In Norway, 300 000 NOK is subject to tax.

We calculate:

300 000 ÷ 400 000 × 100 = 75 percent.

Piotr himself could look at his situation and say:

"After all, 100 percent of my income comes from Norway."

That's true.

But for this test, the fact that he remains married changes the way the assessment is made.

In our example the family does not reach the required 90 percent.

Therefore, when copying someone else's tax return, one must exercise particular caution.

Two workers can earn exactly the same amount.

One is single.

The other has a wife working in Poland.

Their tax situation may be completely different.

What about a partner you are not married to?

A regular partner is not automatically treated the same as a spouse.

As a rule, the income of a person living with you in an informal relationship is not added to the basic 90 percent test just because you live together.

However, there are exceptions.

If, for example, you have a child together and you apply for the parental deduction, your partner's income may be relevant when assessing entitlement to that specific deduction.

Therefore you always need to distinguish:

the general 90 percent test

from

the conditions of a specific deduction.

Do savings in a Polish bank account also count toward the 90 percent?

Here an important distinction begins.

For the basic test concerning ordinary deductions we are talking primarily about income from employment, pensions, disability-related benefits and business activity.

But for some other deductions a broader definition of income is applied.

The best example is interest on loans.

If you live outside Norway and want to deduct foreign interest, the 90 percent requirement essentially applies to all your income, i.e. your global income.

In that case capital income can also be relevant.

Therefore you must not automatically assume:

“I met the 90 percent test for the personal allowance, so I certainly meet it for the loan.”

That does not always have to be the same test.

We will deal with loans and interest separately, because it deserves a separate guide.

Does owning an apartment or house in Poland get in the way?

The mere ownership of property in Poland does not automatically mean that you cannot meet the 90 percent rule.

The income associated with the property, for example from rental, can however be relevant, and when deducting interest additional rules arise from residence, the type of income and tax treaties.

Therefore for the 90 percent rule itself we do not ask:

“Do I have an apartment in Poland?”

but:

“What income do I earn and where is it taxed?”

That is the crucial difference.

Do PAYE and the 90 percent rule work together?

Not in the way employees often assume.

If you remain in the withholding tax on wages – PAYE system, you pay a set percentage of tax and you do not use ordinary deductions.

If you want to use the standard tax system and deductions, including those stemming from the 90 percent rule, you must file according to the ordinary tax rules.

That is why the 90 percent rule is particularly important when deciding:

stay in PAYE or switch to ordinary tax?

We discussed this topic in detail in the previous guide.

Read also: Kildeskatt 25% in Norway or ordinary tax? Check what really pays off

How to check whether you meet the 90 percent rule?

Do it step by step.

Step 1. Determine your tax status

First answer the question:

Am I a Norwegian tax resident, or do I only have limited tax liability in Norway?

If you are already a full Norwegian tax resident, the situation is different and the rule described in this guide does not serve the same purpose.

Step 2. Collect income from Norway

Calculate income from employment, pensions, relevant benefits and business activities taxed in Norway.

Step 3. Collect relevant income from outside Norway

Check what you earned in Poland or other countries during the same tax year.

Do not omit income simply because it has already been taxed abroad.

The test is about the proportion of income, not whether tax has already been paid somewhere.

Step 4. If you are married, include your spouse

This is very important.

In such a case, the test must be conducted at the level of the spouses' combined relevant incomes.

Step 5. Calculate the percentage

The simplest model:

income taxed in Norway ÷ total relevant income × 100

If the result is at least:

90 percent

you may meet the basic condition for the extended right to ordinary deductions.

Step 6. Check the conditions for the specific deduction

Do not stop at the 90 percent result.

If you want to deduct:

• loan,

• childcare,

• travel,

• costs related to work,

• other expenses,

check the additional conditions that apply specifically to that deduction.

Step 7. Prepare the documents

Skatteetaten may require confirmation that you indeed meet the 90 percent condition.

Therefore it is worth having documentation of income from Norway as well as from your country of residence.

How to document income from Poland?

It is not enough to write:

“I earned nothing in Poland.”

Skatteetaten may demand documentation confirming income earned outside Norway.

In practice, it is advisable to retain:

• Polish tax return or equivalent documentation,

• documents relating to employment income,

• documentation of business activities,

• documents relating to pensions or benefits,

• corresponding documents of the spouse, if their income is being included.

Skatteetaten states in its materials that the taxpayer must be able to document that the required share of income is taxed in Norway.

In an audit, the actual income from the given year matters, not just the taxpayer's statement.

Most common mistake: counting only the Norwegian salary

Imagine an employee who says:

“I worked only four months in Norway and my entire salary was taxed here. So I meet 100 percent.”

Not necessarily.

You still need to ask:

• did you work previously in Poland?

• do you run a business?

• do you have other relevant income?

• are you married?

• what income does your spouse earn?

Only then can the percentage be calculated.

Second mistake: 89 percent is almost 90 percent

Tax-wise, “almost” is not always enough.

If, after correct calculation, it comes out as:

89 percent

You should not treat this as 90 percent just because the difference appears small.

The threshold matters.

Therefore, before filing your tax return it's best to base it on actual documents and correctly calculated incomes.

Third mistake: ignoring the spouse's income

This is especially important for Poles working on rotation in Norway.

An employee may earn all of their income in Norway, while their spouse works in Poland throughout the year.

In such a case, the result of the 90 percent test may be completely different than for a single person earning exactly the same amount.

Therefore the question:

“How much do you earn in Norway?”

is not always enough.

Sometimes you need to ask:

“What are the couple's combined incomes?”

What does meeting the 90 percent rule provide?

If you live in another EU/EEA country, have limited tax liability in Norway and meet the required conditions, you can benefit from most ordinary deductions as if you were taxed as a person resident in Norway.

In practice, the following may be particularly important:

• full personal allowance,

• full standard deduction,

• the ability to use the parental deduction if you meet its conditions,

• other ordinary deductions provided for by Norwegian regulations.

That's why the 90 percent rule can have such a big impact for a person working in Norway only part of the year.

The simplest checklist

If you live in Poland but work in Norway, answer these questions:

1. Do I have limited tax liability in Norway?

2. Do I file under the ordinary rules rather than PAYE?

3. How much did I earn in Norway during the year?

4. How much did I earn outside Norway?

5. Am I married?

6. How much did my spouse earn?

7. Are at least 90 percent of the relevant incomes taxed in Norway?

8. Which exact deduction do I want to use?

9. Are there additional conditions for this deduction?

10. Can I document my own income and — if necessary — my spouse's?

If you can answer these questions, you begin to see your actual tax situation.

Another important aspect: a loan in Poland and interest

The 90 percent rule for interest on a foreign loan works differently than the basic test concerning the personal allowance or the standard deduction.

In the case of interest, Skatteetaten looks more broadly at the taxpayer's total income, including capital income.

There are also questions about whether the interest has already been deducted in Poland and what your tax status is.

Therefore we do not include this topic in the current guide.

We will address it separately.

Next guide: Loan in Poland and tax in Norway – when can you deduct interest?

[PASTE LINK HERE AFTER PUBLISHING THE NEXT ARTICLE]

The 90 percent rule can change the outcome by thousands of kroner

The rule itself sounds simple.

At least 90 percent of the relevant income must be taxed in Norway.

In practice, however, you need to know which incomes the comparison concerns, what your tax status is and whether your spouse's income should also be taken into account.

Therefore it's not enough to say:

„My entire salary is from Norway”.

You need to look at the full yearly picture.

Only then can it be determined whether you are indeed entitled to the extended right to Norwegian deductions.

Editorial comment Your Norway

The 90 percent rule is a good example of how one seemingly small detail can change the entire tax settlement. Especially people working on a rotation or only a few months in Norway should check it before opting out of PAYE or filing a tax return. It is not worth relying on a colleague's tax settlement – with identical pay, income in Poland and marital status can give a completely different result.

Official sources and useful links

Skatteetaten – rules for a person living in an EU/EEA country
Information about the 90 percent condition, full minstefradrag, personfradrag and the impact of the spouse's income.

https://www.skatteetaten.no/person/skatt/hjelp-til-riktig-skatt/utland/skatt-flytter-til-norge/

Skatteetaten – tax rates 2026
Current values of personfradrag, minstefradrag and the rules for proportional reduction of amounts.

https://www.skatteetaten.no/rettskilder/type/uttalelser/uttalelser/forskuddsutskrivingen-2026/

Skatteetaten – foreign loans and interest
Rules for deducting foreign interest and a separate 90 percent test concerning total income.

https://www.skatteetaten.no/person/skatt/hjelp-til-riktig-skatt/utland/lan-i-utlandet/

Information checked: 14 September 2026.