Property expenses and IRS in Portugal: what can actually be deducted?

First, identify which kind of deduction you mean

Portuguese IRS treats a landlord’s Category F expenses, a seller’s capital-gain costs and a household’s personal deductions under different provisions. The same word — deduction — is often used for all three, although the tax effect is not the same.

First identify why the expense was incurred. Was it needed to earn rent, was it inherent to acquiring or selling the property, or is it personal housing expenditure? Only then should the document be classified.

• Rental expense: may reduce taxable Category F rental income
• Acquisition, sale or improvement cost: may reduce a future taxable gain
• Personal deduction: may reduce final IRS within a statutory limit

When selling: documented costs can reduce the gain

For a private property sale, Article 51 allows the acquisition value to be increased by documented enhancement expenditure from the previous 12 years and by necessary, effectively incurred expenses inherent to the acquisition and disposal. Increasing this side of the calculation can reduce the eligible capital gain; it is not a refund of the invoice itself.

Transaction taxes, deed or registration costs and estate-agency commission are examples commonly reviewed in a sale file, but eligibility depends on the legal connection, timing and evidence. Improvement invoices need to describe real work on the property and fall within the statutory period. Mortgage capital and ordinary financing interest do not become acquisition or sale expenses merely because a loan funded the home.

For landlords: Article 41 applies a different test

Against gross Category F rents, an owner may deduct expenses actually borne and paid to obtain or guarantee that rental income. Mandatory condominium charges can qualify. IMI and stamp duty relating to the property are deductible only when the property generated rental income taxed in that year.

The law expressly excludes financial costs, depreciation, furniture, household appliances, decoration and AIMI. This is why a new sofa, a mortgage instalment and a repair invoice should not be entered in one undifferentiated list.

• Keep costs separated by property and tax year
• Distinguish building work from furniture and decoration
• Retain condominium statements and proof of payment
• Match IMI and stamp duty to a year with taxable rent

Pre-rental work can qualify — within limits

Conservation and maintenance expenses paid during the 24 months before the start of a rental can be deductible if the property was not used for another purpose during that period. The rule is useful for an owner preparing a vacant home for a first tenant, but the dates and lack of another use need evidence.

Keep the lease start date, invoices, payment records, photographs and any contractor description together. If work changes the property materially, ask whether it should instead be treated as an improvement for a later capital-gain calculation.

Rent paid for a permanent home is a tax credit, not a landlord expense

A tenant may deduct 15% of qualifying rent for a permanent home from final IRS, subject to the applicable annual limit and income rules. For income earned in 2026, the transitional general limit is €900; current legislation raises the limit to €1,000 from 2027.

This is different from reducing taxable income. It is also separate from the limited mortgage-interest provision for contracts concluded by 31 December 2011, and the two housing deductions are not cumulative in the way many informal checklists suggest.

Moving more than 100 kilometres has a specific rental rule

Article 41 also contains a fact-specific rule for owners who rent out their former permanent home and rent a new permanent home more than 100 kilometres away. Subject to the statutory conditions and limits, rent paid for the new home can be deducted against Category F income from the former home.

This is not a general right to offset one rent against another. The change of permanent-home address, distance, contract and timing conditions should be checked before filing.

Without the right invoice, the expense may not count

The economic purpose of a cost may be clear to the owner, but the tax return has to be supported by documents. Ask for an invoice with the correct name and tax number, a useful description, the property address where relevant and proof that the amount was paid.

For shared invoices or multi-property work, document the allocation method. Keep contracts, bank records and before-and-after evidence with the invoice rather than trying to reconstruct the file when a property is sold years later.

Do not use the same cost twice

An expense already deducted against rental income cannot simply be counted again as an improvement when the property is sold. Article 51 also restricts improvement costs incurred while the property was allocated to a business or professional activity. Classification and timing matter.

A practical year-end review with a certified accountant should reconcile Category F expenses, personal deductions and the long-term property file. The objective is not to collect the largest pile of receipts; it is to preserve the right evidence for the correct tax treatment.

A record system that survives until the sale

Create one digital folder for each property, then separate acquisition, rental years, improvements and sale. Give every file a date, supplier and short description. Keep a simple index showing whether the cost was claimed, reserved for a possible capital-gain calculation or rejected as personal expenditure.

Tax rules and annual limits change. Review the classification in the year the cost is claimed and again before a sale, using the law in force and the facts of the property.