What is the optimal allocation in your Dutch tax return?
The optimal allocation is the split that saves you and your partner the most tax. As fiscal partners you usually file together in one return. You may also each file your own. You choose who reports each shared item, from deductions to savings.¹ The Belastingdienst then taxes each of you at your own rate. So the same deduction can save one of you more than the other.
Meet Daan and May. Daan earns in the top bracket, May works for a foreign employer in the first. This year they have healthcare costs and a donation to divide. We follow their return through this guide.
One part stays out of your hands. Your own salary, business profit and pension are personal. Each of you reports those yourself.¹
In short
You choose the split together. Fiscal partners decide who claims each shared income item or deduction.¹
The higher earner usually claims the deduction. Above €78,426, a cap limits your saving to 37.56% in 2026.²
The online return proposes a split for you. This verdeelvoorstel gives the lowest joint tax for the current year.⁴
Not every return gets a proposal. With business income or a substantial interest you divide by hand.⁴
You can still change the split after filing. You have until both assessments are final, six weeks after the assessment date.¹
Daan and May may only divide what the rules call shared.
Which income and deductions can you split?
You may divide every shared item in any ratio, as long as it totals 100%.¹ First make sure you are fiscal partners. Married couples and registered partners count automatically. Living together counts only when you are both registered at the same address.¹ You also need a notarial contract, a shared child or a shared home.¹ Not sure about your situation? Our fiscal partnership guide lists every condition and start date.
The shared items reach further than most couples expect, from your home to your savings. The table shows what you may divide and what stays personal. In your year of arrival or departure the Box 3 part cannot be divided. Together you share one tax free allowance of €118,714 in 2026.⁵
| Item | What it covers | How you may divide it |
|---|---|---|
| Own home | The deemed rental value of your home minus your mortgage interest | Any ratio that totals 100%, you choose |
| Personal deductions | Costs you may deduct, such as healthcare costs, partner alimony and donations | Any ratio, as long as it totals 100% |
| Box 2 substantial-interest income | Dividend or a sale gain when you own 5% or more of a company | Freely, in any ratio you choose |
| Box 3 taxable base | Your joint wealth above the tax free allowance of €118,714 | Any ratio totalling 100%, not in a migration year |
| Own salary, profit, pension, received alimony | What each of you earns or receives personally | Not divisible, stays with that partner |
Knowing what you may divide is step one. The saving comes from where you put it.
Why does the split change how much tax you pay?
Each partner pays tax at their own rate. A deduction lowers the taxable income of the partner who claims it. The saving therefore equals that partner's rate. Daan pays 49.50% over his top slice, May pays 35.75% in the first bracket.³ The same donation saves more on Daan's return.
One cap applies. Is your income from work and home above €78,426, before deductions? Then the Belastingdienst limits the benefit of most deductions to 37.56% in 2026.² For Daan that capped rate still beats May's rate. Putting the shared costs on his return earns them the most.
Curious which rate applies to which slice? Our guide to the tax brackets and rates sets them all out.
That rate logic sounds like homework. The good news: the return does the sums for you.
How do you find the optimal split in practice?
Start with the split the online return proposes, then judge it. File the joint return online and the Belastingdienst calculates a proposal for you. That is the verdeelvoorstel, the division with the lowest joint tax within this year's return.⁴ You accept it with one click, or you slide the percentages yourself.
Back to Daan and May. The proposal puts the donation and the healthcare costs largely with Daan. Each euro of deduction saves more at his higher rate.² That matches the rate logic, so they accept it. We then check what the proposal leaves out, such as benefits and the years ahead. The saving in euros depends on both incomes. We calculate it with your own figures in a conversation.
“The proposal finds the lowest tax for this year. We look further, at your benefits, your savings and the years ahead. That is where the real saving is.”
After the sums, one decision remains: accept or adjust.
What does this mean for your return?
For most couples the proposal is a safe choice. In three cases it pays to look further. Your incomes differ a lot. One of you has income or assets abroad. Foreign assets count in Box 3 and foreign income can affect your tax credits. Or you get a benefit or tax credit that depends on your total income. Take the ouderenkorting, the credit for people at state-pension age. It runs to €2,067 in 2026 and shrinks once your income passes €46,002.⁶ A different split can move you across that line.
Second thoughts after filing? You may still change the split until both assessments are final.¹ Without an objection that is six weeks after the date on the assessment.¹ Adjust the return and send it in again.¹ Is the difference small? Then often nothing changes hands: the Belastingdienst only imposes an assessment above €58 and only pays out a refund above €18 in 2026.⁷
Curious what each bracket costs? Our Dutch tax rules overview lists every 2026 figure. And when you want the whole return handled, our tax filing service takes it over. Daan and May accepted the proposal and had it checked before filing.
¹ Belastingdienst, Fiscaal partnerschap - Wanneer ben ik fiscaal partner? · Accessed
² Belastingdienst, Afbouw tarief aftrekposten als u een hoog inkomen hebt · Accessed
³ Belastingdienst, Box 1: uitleg en tarieven · Accessed
⁴ Algoritmeregister, Optimale verdeling tussen fiscale partners · Accessed
⁵ Belastingdienst, Wat is het heffingsvrij vermogen? · Accessed
⁶ Belastingdienst, Heffingskortingen voor AOW-gerechtigden · Accessed
⁷ Belastingdienst, Definitieve aanslag inkomstenbelasting (aanslag- en teruggaafgrens) · Accessed
Common questions about the tax partner allocation
What is the optimal allocation for fiscal partners?
It is the division of shared income and deductions that leaves the lowest joint tax. You set it in your joint return, in any ratio that totals 100%.¹
Should the higher earner claim all the deductions?
Usually yes, because a deduction saves tax at the rate of the partner who claims it. Mind the 37.56% cap in 2026 and any income-dependent benefits before you decide.²
Does the Belastingdienst propose a split for us?
Yes. The online return calculates the verdeelvoorstel automatically. You accept it or enter your own percentages. Complex returns get no proposal.⁴
Can we change the split after we filed?
Yes, until both assessments are final. Without an objection that is six weeks after the assessment date. Adjust the return and resubmit it.¹
We moved to the Netherlands this year. Can we split everything?
Almost everything. In a migration year you cannot divide the Box 3 part. The other shared items follow the normal rules once you are fiscal partners.¹
Does the split change our Box 3 tax?
Rarely the amount itself, because Box 3 has one flat rate over a deemed return. The split does shift each partner's income total, which can touch a benefit or credit. The first €118,714 stays untaxed for partners in 2026.⁵
