Quick answer: the Netherlands taxes wealth rather than rental profit, and from 2026 the actual-return calculation counts the change in your Italian property’s value even though you have not sold it. A Dutch owner can face a Dutch tax bill in a year when the house produced no cash at all, purely because the market moved. Relief for Italian tax exists and has to be claimed.
Every other country in this cluster asks a version of the same question: what did the Italian house earn, and who taxes it. The Netherlands asks a different question, and the answer it has arrived at for 2026 puts Dutch owners in a position that has no parallel among the other buyers on this site.
Why does box 3 charge a return the house did not produce?
Box 3 is the Dutch tax on wealth. Assets held on the reference date are assessed, a return is attributed to them, and that attributed return is taxed. For most of its life the system used a fixed deemed percentage, which is where the trouble began: taxpayers whose actual returns fell short of the deemed figure were being taxed on income that did not exist.
The Hoge Raad found that incompatible with property rights and required a route for taxpayers to demonstrate their real return, the counterevidence scheme. It is explicitly temporary, bridging until the Box 3 Actual Return Act is expected to take effect in 2028, and the court has continued to refine it, including a ruling of 18 July 2025 dealing with foreign holiday property.
The refinement that matters arrived for 2026: the actual return now includes unrealised changes in the value of the property. The scheme designed to stop people being taxed on income they had not earned now, in the property case, taxes appreciation they have not realised.
| Year on an Italian apartment | Cash received | Value movement | Counted as return |
|---|---|---|---|
| Let for 20 weeks, flat market | €9,000 | €0 | €9,000 |
| Let for 20 weeks, market up 6% | €9,000 | €24,000 | €33,000 |
| Empty all year, market up 6% | €0 | €24,000 | €24,000 |
The third row is the one to sit with. The house earned nothing, cost the owner IMU and condominio charges, and still produced a taxable Dutch return.
What does that do to the valuation question?
For a Dutch house the valuation is settled by the WOZ assessment and nobody argues about it. For an Italian house there is no such figure, and the owner has to arrive at a market value they can defend.
That used to be an administrative chore. Under the 2026 rules it is the tax base itself, because the year-on-year movement in the number the owner supplies is what gets taxed. A valuation approach that tracks a rising local index produces a larger Dutch bill than one anchored to a conservative comparable, and both have to be defensible.
Two Italian figures complicate the picture rather than settling it. The cadastral value, used for Italian registration tax and IMU, is a fiscal construct that sits well below market and is not a market valuation. The purchase price is evidence of value at one moment and decays as evidence quickly in a market that moves. Our guide to cadastral value against market price explains why the two diverge so widely in Italy.
- Keep the same valuation methodology year to year, because the tax is on the difference between successive figures
- A formal Italian valuation, a perizia, is the strongest support and is worth commissioning if the property is substantial
- Renovation spending raises value and therefore raises the taxed movement, which is worth modelling before a large works programme
- Risk: switching methods between years can create an artificial jump that is taxed as a return
How do you actually stop paying twice?
The Netherlands gives relief for foreign immovable property, and the mechanism is a deduction in the box 3 calculation for the foreign asset. It is not applied because the tax office knows the house is in Italy. It is applied because the taxpayer completes the relevant part of the return.
Owners who declare the Italian apartment as an asset and stop there pay the full Dutch charge on top of everything Italy has taken. Italy will have taken IMU annually on a second home, and income tax on any letting at 21% or 26% under the flat regime or under ordinary IRPEF, as covered in our cedolare secca guide.
The claim is straightforward when the paperwork exists and difficult when it does not, so the practical work is Italian record-keeping rather than Dutch form-filling.
- Keep the annual IMU payment receipts, since the IMU guide explains a charge the comune does not bill you for
- Retain the Italian tax filings for any letting income, with dates
- Where the property is held jointly, the relief follows the ownership shares recorded in the Italian deed
Fiscal partners have one further lever. Box 3 assets can be allocated between partners on the Dutch return, and because the charge is progressive across bands, the split is not always best made down the middle. The Italian deed fixes legal ownership and the Dutch allocation is a separate annual choice, so a couple who recorded equal shares at the rogito are not obliged to report equal shares in the Netherlands.
Why does the completion date decide your first Dutch tax year?
Box 3 is assessed on a reference date at the start of the year, not on an average of the year. What you owned on 1 January is what enters the base, and what you bought on 2 January does not enter it until the following year.
For an Italian purchase that turns the rogito date into a tax decision. A deed completed in November puts the property into the Dutch base for the year beginning six weeks later, with a full year’s charge. The same deed completed in January defers the first Dutch assessment by nearly twelve months, and in that intervening year the money sits as cash, which is itself a box 3 asset but a differently valued one.
The effect is larger than most buyers expect because the purchase costs are not in the base at all. Italian registration tax, notary fees and agency commission, running to 10% to 15% of the price on a second home, are spent rather than held. A buyer who completes in December has converted cash into an asset plus a substantial sunk cost, and the asset is what gets assessed.
| Rogito date | First year in the box 3 base | Practical effect |
|---|---|---|
| Mid-December | The very next 1 January | Full charge almost immediately |
| Mid-January | The following 1 January | Nearly a year of deferral |
- Insider tip: where the compromesso allows either side of the new year, the buyer’s Dutch position favours January and the seller’s Italian position rarely objects
- The deferral is a timing benefit, not a saving, and it is worth roughly one year’s charge
- Do not distort the purchase to chase it: a January deed that loses the property is an expensive optimisation
How does an Italian mortgage change the Dutch calculation?
Differently from how Dutch buyers expect, because two systems that both concern mortgages do not both apply.
The familiar Dutch mortgage interest deduction belongs to box 1 and attaches to the eigen woning, the taxpayer’s own primary residence. An Italian holiday home is not an eigen woning, so the interest on a loan financing it is not deductible against Dutch employment income. Buyers who assume the Italian mortgage will behave like their Amsterdam one are wrong in a way that changes the return materially.
What the debt does instead is reduce the box 3 base. Debts are set against assets in box 3, subject to a modest statutory threshold, so an Italian mortgage lowers the net wealth on which the Dutch charge is computed. That makes borrowing more attractive in the Dutch system than in the German one, where exemption removes both the income and the deductions, and it makes a leveraged Italian purchase a genuinely different proposition depending on which side of the border the buyer files.
The interaction with the 2026 rules is worth thinking through. If the taxed return now includes the property’s appreciation, and the debt reduces the base against which wealth is charged, then a leveraged owner in a rising market is taxed on the full appreciation while holding only part of the equity. The leverage amplifies the taxed return without amplifying the relief.
- Italian mortgage interest is not deductible in box 1 against Dutch salary
- The loan itself reduces the box 3 base, which is the relief that does exist
- Model the leveraged case explicitly under the 2026 rules rather than assuming leverage is neutral
- What an Italian lender will advance to a non-resident is a separate question, covered in the mortgage guide
Which Dutch buyer scenarios does 2026 reshape?
The pure holiday-home owner in a rising market. The most exposed profile on this page, and the least intuitive. No rent, no cash, an annual Dutch charge driven entirely by appreciation, plus Italian IMU. Buying in a market with strong price momentum now carries a Dutch cost that buying in a stable one does not.
The owner who lets for part of the year. The 2026 own-use allocation splits the year between personal use and availability, so the usage record becomes evidence. This profile should keep a booking calendar that documents both halves, because the split is now assessed rather than assumed.
The long-hold family owner. Over a decade, taxing unrealised appreciation annually means the Dutch state has taxed most of the eventual gain before the sale ever happens. Whether that produces a better or worse outcome than a single capital gains charge depends on the path of prices and on what the 2028 legislation does, which is genuinely unsettled.
The buyer choosing between Italy and a Dutch second home. Box 3 reaches both, so the wealth charge is not the differentiator. What differs is the valuation mechanism, the WOZ figure at home against a defended valuation abroad, and the Italian layer of IMU and letting tax. The comparison is closer than most Dutch buyers assume.
The buyer waiting for the law to settle. A reasonable instinct and a costly one to follow indefinitely. The Box 3 Actual Return Act is expected in 2028, the counterevidence scheme bridges until then, and the Hoge Raad has changed the picture twice in two years. What a Dutch buyer can do is document defensibly from day one: a supportable opening valuation, a consistent method, dated Italian tax receipts and an honest usage record. Those survive whichever way the legislation lands, and reconstructing them retrospectively in 2028 for a purchase made in 2026 is the avoidable version of this problem.
For the Italian purchase itself, which carries no Dutch complication at all, see the step-by-step sequence and the due diligence guide. For why a Dutch owner keeping their residence in the Netherlands pays Italy’s second-home rates throughout, the prima casa comparison sets out the condition they cannot meet, and the selling guide explains what leaving the market involves in practice.
Frequently Asked Questions
Through box 3, the Dutch charge on wealth rather than on income. The Italian property enters the box 3 base as an asset, and the Netherlands grants relief for the fact that Italy also taxes it. What box 3 does not do is wait for you to earn anything: it charges a return whether or not the house produced one.
The actual-return calculation now includes unrealised value changes in the property. Under the counterevidence scheme a taxpayer can show their real return is lower than the deemed one, but from 2026 that real return counts the movement in the property's value even though nothing was sold. A house that appreciated €40,000 on paper has produced a €40,000 return for this purpose.
No. It is a temporary construction the Hoge Raad required after finding the deemed-return system incompatible with property rights, and it is expected to run until the Box 3 Actual Return Act takes effect in 2028. The relevant Supreme Court decisions include the ruling of 6 June 2024 and the further ruling of 18 July 2025 addressing foreign holiday property specifically.
It reduces it, and only if you claim it. The Netherlands gives relief for foreign immovable property, but the relief is applied through the relevant section of the Dutch return rather than automatically. Owners who report the asset and omit the relief pay full Dutch box 3 tax on top of Italian IMU, which is the most common and most avoidable error in this cluster.
At market value, which for a foreign property means a defensible valuation rather than an official figure. This is a genuine difference from a Dutch house, where the WOZ assessment settles it. For an Italian property the owner has to arrive at a value and be able to support it, and because the 2026 rules tax the movement in that value, the valuation method now drives the tax rather than merely recording the asset.
From 2026 yes. A separate own-use allocation applies where a second home is partly used by the owner, which splits the treatment between the period of personal use and the period it was available for letting. That makes the usage diary a tax document rather than a private matter, and it rewards owners who can evidence how the year was actually divided.
Materially, and it is the strangest planning consequence of the 2026 change. Two identical Italian apartments producing identical rent are taxed differently in the Netherlands if one sits in a rising market and the other does not. Nothing about the owner's cash position differs, and that is the objection the litigation has been circling for years.
None. The Netherlands is an EU member state, so the reciprocity condition never arises, there is no stay limit, and the purchase runs exactly as it does for an Italian buyer. Every complication described here sits in the Dutch tax code.
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