What you pay and who pays it
When you carry out works in Barcelona under a notification or a licence, you pay the City Council two things. The first is the urban planning services fee, which covers processing the file. The second is ICIO, the tax on constructions, installations and works, governed by tax ordinance 2.1. Under the version approved on 30 January 2026, the rate is 4% of the material execution cost of the works.
Both are paid by self-assessment (autoliquidació): the works procedure itself generates the document with the amount and you pay it. Yes, you can do it yourself without an agent. The taxpayer is the owner of the works, which the ordinance defines as whoever bears their cost, even if they don't own the property; if someone else applies, that person acts as a substitute and can pass the amount on to them. The tax is managed by the Institut Municipal d'Hisenda, the city's tax office.
How much it is and what goes into the base
The ICIO base is the real and effective material execution cost: labour, materials and equipment to carry out the works. The ordinance leaves out VAT, fees, architects' and technicians' fees, the contractor's profit and overheads. So the budget you declare is not the total quote including VAT but the material execution figure. If you renovate a flat with a material execution budget of 60,000 euros, the ICIO is 2,400 euros.
The fee, according to the City Council's procedure page (updated in 2026), is 51 euros for a minor works notification with a technical project, 43 euros with technical documentation, 385 euros for most major works licences, and 4.96 euros per square metre with a minimum of 385 euros for new builds, major refurbishment and added volume. The simple notice (assabentat) and emergency works are free, and interior works that don't change layout, structure or facade in unprotected buildings are not subject to ICIO.
The ordinance also has an annex of per-square-metre modules by building type, which the City Council can use to set or check the base. If the works are in Castelldefels or another town, the rate and reliefs are set by that council's own tax ordinance.
When the payment slip arrives
It depends on the regime. With a comunicat immediat, the ICIO self-assessment is generated together with the admission, in the same procedure where you file the documents, and you can pay it right there; once paid, you start. With a comunicat diferit, you receive the payment slip with the admission, within the one-month review.
With a major works licence there are two moments. When you apply, you are emailed the self-assessment for the fee, which you must pay within two months at most; processing doesn't start until you pay. The ICIO comes later, with the decision granting the licence, and is paid before the works begin.
Separately, if you want a tax relief, you request it at the same moment you file the licence or notification, by ticking it in the self-assessment. The ordinance treats later requests as out of time.
Step by step: how to pay
According to the Institut Municipal d'Hisenda, you have three ways. Online, by card or Bizum, with no digital certificate needed: if you are in the works procedure, it offers the option at the end; if you already have the payment slip, use the details printed on it. At the collaborating banks, which are Banc Sabadell, Banco Santander, BBVA and CaixaBank, through online banking, at a branch or at an ATM. And at computerised Correos post offices, asking first about the transfer charge.
The payment slip is valid for three months from issue. If you miss it, there is no duplicate: you have to request the works case again. When you pay, download or keep the receipt and file it with the rest of the works paperwork; for a major works licence you don't need to take it to the OAC, but it is worth having to hand in case you are asked.
If you pay on someone else's behalf, for example a relative who lives abroad, the payment slip is usually enough, even if you are not the holder. For later dealings with the city tax office in their name, however, you will need to prove representation, for example with a signed authorisation or an entry in the Representa register.
Tax reliefs worth checking
Tax ordinance 2.1 for 2026 includes several reductions of the tax due. The most useful for individuals: 95% for works that add systems using solar energy for heat or electricity, as long as they are not legally required or part of a general works project; 90% for works that improve access and habitability for people with disabilities, under the same conditions; and 50% for removing fibre cement (asbestos cement). The solar relief must be requested before the works start, with the self-assessment paid and the technical report or project showing an itemised budget for the installation.
For protected buildings there are reliefs for conservation and maintenance works: 95% at level A, 50% at level B and 35% at level C. There is 30% for premises of new businesses that have increased their workforce, and 95% for certain works within the Regeneració Urbana programme. The special-interest reliefs for social, cultural or employment reasons cannot be combined with each other.
Two rules apply to all of them: the relief covers only the part of the tax that corresponds to the qualifying works, which you prove with an itemised budget, and it is not granted if the works are not covered by a licence, notification or legalisation.
When the works finish, and common mistakes
The initial payment is on account. If the real cost ends up different from the declared budget, you settle it through the procedure "Liquidació definitiva de l'impost sobre construccions, instal·lacions i obres (ICIO)", providing the revised budget, proof of the initial payment, the final works certificate, the handover record and a detailed cost breakdown with invoices and contracts. The city tax office checks it and charges or refunds the difference; if you don't request it, the office has four years to do it itself. New in the 2026 ordinance: for works finishing on or after 1 January 2027, a final self-assessment will be mandatory within three months of completion, even if it comes out at zero.
The most common mistakes: declaring the total including VAT and professional fees as the base, which inflates the tax; declaring less than the real cost, which ends in an assessment with possible penalties; forgetting to tick the relief when filing; letting the payment slip expire; and not keeping invoices. If you give up the licence or it is refused, you can ask for a refund. Tax ordinances change every year, so check the current procedure page before paying. If you would rather not deal with it, BCN YARD handles the payments and the final settlement together with the works.
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