Model 30 in short-term rental: who must file, deadlines, and how to complete it
Find out if you need to file Model 30, when the deadlines fall, and how to complete the VAT return correctly for your AL.
Model 30 is one of those obligations many short-term rental owners only discover after the deadline has already passed. It's not complicated — but it has nuances that depend on your VAT regime, and mixing the two up can cost you unnecessary fines.
This guide gets straight to the point: what it is, who needs to file, when, and how.
What is Model 30
Model 30 is a periodic VAT return used to report to the Tax and Customs Authority (AT) the taxable transactions carried out during a given period. It's how you declare the VAT charged on your services and the deductible VAT on eligible expenses — and work out whether you owe tax or are due a refund.
It is not an income declaration (that's your IRS or IRC return). Model 30 is exclusively about VAT.
Who needs to file
This is the point that causes the most confusion: not every AL owner files Model 30.
The obligation depends on which VAT regime you're in.
Standard VAT regime
If you're in the standard regime — because your annual turnover exceeds the exemption threshold set out in Article 53 of the VAT Code, or because you voluntarily opted into it — you must file Model 30 either monthly or quarterly, depending on your turnover level.
- Monthly filers: applies to operators whose turnover exceeds the threshold defined in law for quarterly filing.
- Quarterly filers: applies to those in the standard regime whose turnover falls below that threshold.
AT automatically assigns you to one of the two frequencies based on your data, but it's always worth confirming on the Portal das Finanças.
Exemption regime (Article 53)
If your annual turnover stays below the legal threshold and you haven't waived the exemption, you're not required to charge VAT — and therefore you don't need to file Model 30. You do, however, need to file a commencement or amendment declaration whenever your regime changes.
Small retailers regime
This regime doesn't typically apply to short-term rental, but if for any reason you find yourself in it, the rules are different — speak to a certified accountant.
Quick check: if you're not sure which regime you're in, go to Portal das Finanças → A Minha Situação → IVA. Your classification is right there.
Filing deadlines
Deadlines are set annually by AT and can be adjusted, so the most reliable source is always the tax calendar published on the Portal das Finanças for the current year.
As a general rule:
- Monthly filers: the return for a given month is filed in the second month that follows (for example, January's return is filed in March).
- Quarterly filers: the return for each quarter is filed in the second month after that quarter ends.
Payment of any VAT due follows the same deadline as the return — there's no separate payment date.
One important note: filing late triggers fines, even if there's no tax to pay. A nil return still has to be filed if you're in the standard regime.
How to complete Model 30
Filing is done exclusively online, through the Portal das Finanças.
Step by step
- Log in to the Portal das Finanças with your NIF and password (or Chave Móvel Digital).
- Go to Serviços → IVA → Entregar Declaração Periódica.
- Select the period you're declaring (month or quarter).
- The portal pre-fills some fields based on previous data — check everything carefully before submitting.
The fields that matter most in AL
| Field | What you declare |
|---|---|
| Taxable base for services | The value of your AL income subject to VAT (excluding VAT itself) |
| VAT charged | The VAT billed to guests on your invoices |
| Deductible VAT | VAT paid on eligible expenses (cleaning, maintenance, etc.) |
| VAT payable / refundable | The result of the calculation |
Most common mistakes
- Including exempt income as taxable — if you have long-term rentals alongside AL, the VAT rules are different for each.
- Forgetting deductible VAT on expenses — many owners only declare the VAT they charged and overlook what they can claim back.
- Not filing a nil return — if you had no activity in a given period, you still need to file.
- Mixing up the reference period — the March return isn't about March; it covers the previous period.
Invoicing and Model 30 go hand in hand
Model 30 is only as accurate as your invoicing. If your invoices are incomplete, incorrectly dated, or haven't been communicated to AT, your VAT calculation will be off — and AT detects those discrepancies automatically.
Make sure every booking has an invoice issued at the right time, with the correct VAT applied, and communicated through the e-fatura system. That's the only way Model 30 reflects reality.
When it makes sense to bring in an accountant
If you're in the standard VAT regime with meaningful turnover, or if you have significant expenses you want to deduct, a certified accountant (TOC) isn't a luxury — it's protection. Model 30 can look straightforward, but errors accumulate and retroactive corrections are a headache.
If your AL is small and you're in the exemption regime, you can manage this more independently — but even then, an annual review with a professional is worth it to confirm your classification still makes sense given your current turnover.