Most owners discover the answer in the wrong order. They ask what the tax rate is, get a number, and assume the number settles it. It does not, because rate and reporting are different questions and they are decided by different instruments — the rate by domestic law in each state, the reporting by domestic law in both.
The short version: letting a Montenegrin property creates a filing surface in Montenegro and a separate filing surface in the United Kingdom, neither of which cancels the other. The double taxation convention that sits between them allocates taxing rights and provides relief. It does not merge the two filings, and it does not excuse either.
This page maps that surface — who has to tell whom, and by when. The Montenegrin licensing and categorisation side is on our short-term rental guide, and the choice between short-let and long-let regimes is on our rental income page. We do not compute anyone's tax here, and the UK side of any actual return belongs with a UK adviser.
The two surfaces, side by side
| Obligation | Who it falls on | When | Source |
|---|---|---|---|
| Montenegrin annual tax return | Non-resident with Montenegrin income not subject to withholding | By the end of April for the previous year | Personal Income Tax Act, Arts. 43(2) and 43(6) |
| Montenegrin return even with no income | Anyone holding a letting approval for tourist accommodation | Same deadline, every year the approval exists | Personal Income Tax Act, Art. 43(5) |
| Return filed for you if you do not file | Any taxpayer who misses the deadline | After the deadline passes | Personal Income Tax Act, Art. 43(6b) |
| Guest registration and tourist stay tax | The host, to municipal and police systems | Per stay, not annually | Tourism legislation — see our rental guide |
| UK reporting of foreign property income | UK residents, on worldwide income | UK self-assessment cycle | UK domestic law — take UK advice |
The Montenegrin side: the licence files, not the income
Start with who is a taxpayer at all. Article 2(1) of the Personal Income Tax Act makes a resident or a non-resident natural person who earns income from the sources the Act identifies a taxpayer. Non-residence is not an exemption; it is a description of which income is caught.
What you earn from a let is squarely inside the Act. Article 34 defines income from property as income realised from letting movable and immovable property. A flat in Budva let to holidaymakers and a house let to a long-term tenant are the same head of income; what differs is the regime around them.
Then the filing rule that applies to a UK-resident owner. Article 43(6): a non-resident files a tax return for income realised in Montenegro for which withholding tax is not provided. That is the pivot most owners miss. Where a Montenegrin legal person or entrepreneur pays you and accounts for tax at source, the return duty is handled differently; where the money reaches you without that mechanism — the common position for an owner letting directly or through a foreign platform — the return is yours to file.
The deadline is Article 43(2): the return is filed by the end of April of the current year for the previous year.
Two provisions in the same article deserve to be read before anyone decides that a quiet year needs no attention.
Article 43(5) — the approval files, whether or not you earned anything. A taxpayer who lets rooms, apartments, houses and holiday flats to travellers and tourists and holds a work approval issued by the competent authority files a tax return regardless of whether income was realised in the tax period. Read that twice if you have a categorised unit that sat empty last season, or one you stopped letting without surrendering the approval. The trigger is the approval, not the money.
Article 43(6b) — silence is not an option the statute recognises. Where a taxpayer does not file within the statutory period, the competent tax authority files the return on the taxpayer's behalf, ex officio. Nothing about being abroad pauses that. The practical consequence is that a missed year does not stay quiet; it becomes an assessment built without your figures and your deductible costs.
There is a related point for owners who let through a Montenegrin agency or company: for residents, Article 43(4)(2) removes the return duty for property income precisely where the payer is a legal person or an entrepreneur, because the tax is accounted for at source. The mechanism that decides your position is therefore who pays you, not what you call the arrangement. Establish that before the season, not in April.
The UK side, stated as a signpost
A UK resident is taxed on worldwide income under UK domestic law, and income from foreign property is reportable in the UK regardless of what has already been paid in Montenegro. That much is uncontroversial and it is where our part of the sentence stops: we do not prepare UK returns, we do not compute UK liabilities, and the interaction of your Montenegrin income with your UK position — the property allowance, permitted deductions, the treatment of a jointly held property, the timing mismatch between the two tax years — is for a UK adviser working from your figures.
What we can do is make sure the Montenegrin half of the file exists in the form your UK adviser will ask for: the return actually filed, the tax actually paid, and the documents that evidence both.
What the treaty does, and four things it does not
There is a treaty. According to HMRC, the 1981 UK–Yugoslavia Double Taxation Convention entered into force on 16 September 1982 and continues to apply to Montenegro. It takes effect in Montenegro from 1 January 1983, and on the UK side from 1 April 1983 for corporation tax and 6 April 1983 for income tax and capital gains tax. Signature by a state that no longer exists does not make it a historical curiosity: it is the operative instrument between the UK and Montenegro today.
On letting income, the Convention is explicit. Article 6(1): income from immovable property may be taxed in the Contracting State in which the property is situated. Article 6(3): paragraph (1) applies to income derived from the direct use, letting, or use in any other form of immovable property. Letting is named, not inferred.
Now the four limits.
It says "may", not "only". Article 6(1) permits the situs state — Montenegro — to tax. It does not stop the state of residence from taxing the same income. That is not a drafting slip; it is the standard architecture, and it is why relief exists at all.
Relief is a credit, and it runs through domestic law. Article 22(1) provides that, subject to the provisions of UK law on crediting tax payable outside the UK, tax payable under the laws of the other state on income from sources there is allowed as a credit against UK tax. A credit is not an exemption, and it is capped by the domestic rules it is subject to. It also presupposes that you can prove the foreign tax was paid — which returns you to the Montenegrin filing.
The taxes it names are from another economic system. Article 2(1) lists the Yugoslav taxes covered in 1981, including the tax and contributions on income of organisations of associated labour and, in the Convention's own English, the tax on income from capital and capital rights. Today's Montenegrin personal income tax is not on that list because it did not exist. The bridge is Article 2(2), under which the Convention also applies to identical or substantially similar taxes imposed after signature, in addition to or in place of the existing ones. That is a clause an adviser confirms for the specific tax in question rather than assumes.
Information moves between the two states, on an older and narrower formula. Article 25 provides for exchange of such information as is necessary for carrying out the Convention and the domestic laws concerning the taxes covered by it, with the information treated as secret and disclosed only to persons concerned with assessment, collection or prosecution in respect of those taxes. It is not the modern "foreseeably relevant" standard, and it is tied to the taxes the Convention covers. Owners who assume nothing crosses the border should note that something plainly can; owners who assume everything does are also wrong. If the two states end up taxing you in a way the Convention does not permit, Article 24 provides the mutual agreement procedure.
One caution on currency: Montenegro's adherence to the Multilateral Instrument takes effect in 2026, and multilateral modifications only reach a particular convention where both states have listed it. Whether this Convention is modified, and in what respect, is a question to confirm at the time — not one to assume in either direction.
The trail that is not tax at all
Two Montenegrin duties often get filed mentally under "tax" and are neither. Guest registration and the tourist stay tax are obligations of the host towards municipal and police systems, arising per stay rather than per year, and they are collected and remitted on their own timetable. They do not satisfy the income tax return, and the income tax return does not satisfy them. What they do create is a contemporaneous record of occupancy in a public system — which is worth knowing before deciding that an empty-looking year is invisible. Both are set out in our short-term rental guide.
Whose side we are on, and how we are paid
Almost everyone else in this transaction is paid by it. The agent's commission depends on the letting or the sale closing. The management company's fee depends on the unit staying on its books. The notary's duty runs to the transaction, not to you. None of that is scandalous, but it is worth knowing before you treat any of them as your adviser.
We take no commission from sellers, developers, agents, management companies or intermediaries — in no form, on no file. Our only income is the fee you pay us, and it does not rise if you sign, buy or let. Telling you that a letting structure is not worth the compliance it carries costs us nothing.
In practice that means we pull the registry and approval records ourselves rather than accepting a manager's summary; we read the arrangement against your position rather than against occupancy targets; when the answer is that an approval should be surrendered rather than kept, you get it in writing; and where a filing has been missed, we tell you what the exposure is before anyone files anything.
One boundary that is not negotiable: we are lawyers, not licensed investment advisers, and we are not UK tax agents. We do not give personal investment advice on financial instruments, we do not tell you whether a letting will make money, and we do not prepare UK returns. What we protect is your legal position — title, contract, registration, status, and the deadlines that decide all four. That is independent legal advice, paid by fee rather than by commission, which keeps our interest aligned with the client rather than with the transaction.
Before the next April
Three things answer most of this for a specific flat: the approval file (does one exist, and is it still live), the payment route (who pays you, and do they account for anything at source), and the filing history (what has been submitted in Montenegro, and what has not). Send those and we will tell you what is owed to which state and by when, and what your UK adviser will need from the Montenegrin side. Our international tax practice handles the Montenegrin half of these files, and British owners will find the wider picture on our Montenegro guide for British citizens.
