Every December 31st, thousands of homeowners lose money. Not because they spend it, but because they don’t claim it.
There are tax deductions in income tax published in the Official Gazette, available to anyone who renovates their habitual residence with accessibility or energy efficiency criteria. But they have one detail that changes everything: they apply to the tax year in which you pay for the work. And the tax year ends, inevitably, on December 31st.
What does that mean? If you finish and pay for your renovation on December 28th, you deduct on your April tax return. If you pay on January 3rd, you wait fifteen months to see that money. And if you simply don’t renovate before the year end, that year’s deduction is lost. Gone. It doesn’t come back.
In December 2025, our team completed 14 renovations in just the last two weeks of the year. In every case, the motivation was the same: close the renovation within the tax year to avoid losing the deduction. In some cases, those clients saved between €600 and €1,000 on their tax return. Just by doing the maths in time.
This is pure common sense. And yet, most homeowners don’t find out until it’s too late.
In this article we explain what tax benefits are at stake, how the calendar works and how to plan your renovation so you don’t leave money on the table.
The tax deductions governed by the calendar year
Look, the Spanish tax system works in annual periods. Everyone knows that. What not everyone is clear on is that certain deductions for home improvements only apply to payments made within that period. It’s not enough to have signed the quote or started the work: what counts is when you pay.
There are two major blocks of deductions that directly affect a bathroom renovation.
Deduction for accessibility improvement
Regulated in Law 35/2006 on Income Tax and its successive updates. It allows deducting up to 20% of what you paid on works that improve the accessibility of the habitual residence, with a deduction base limit of €5,000 per year. In practice, that’s up to €1,000 in direct savings on your tax liability.
What kind of works count? Replacing a bathtub with a flush-to-floor shower, installing grab bars, non-slip flooring, widening doors. Everything that removes architectural barriers in the bathroom. If you want to go deeper into this specific deduction, we have a dedicated article: tax deduction for bathtub-to-shower replacement.
The key requirement: payments must be dated within the tax year. If you pay in November, you deduct in April of the following year. If you pay in January, you deduct in April of the year after that. And if you don’t do the renovation, you don’t deduct anything.
Deduction for energy efficiency improvement
Here things get even more interesting. Energy efficiency deductions for homes, introduced by Royal Decree-Law 19/2021 and successively extended, allow deducting 20% of the cost of works that reduce the home’s heating and cooling demand by at least 7%, or 40% if they reduce non-renewable primary energy consumption by at least 30%.
In a bathroom, how does that translate? Better insulation on exterior walls (if the bathroom faces outside), switching to low-consumption LED lighting, installing thermostatic taps and water-saving systems with energy certification.
The limits are generous: €5,000 deduction base for the 20% one, and €7,500 for the 40% one. And here’s the important part: these deductions have an expiry date. For 2026 they’re confirmed. For 2027, as of today, there’s no guarantee. The Government can extend them or let them expire. It wouldn’t be the first time a current deduction disappears from one year to the next without warning.
Our recommendation: if you’re thinking of renovating in 2026, don’t wait until October. These deductions are in force now. Tomorrow, who knows.
The year-end maths: why the month matters so much
This is where you understand why the date of your renovation isn’t a minor detail. It’s a financial decision.
Scenario A: renovation in November 2026
You pay for the work in November. In April 2027 you file your 2026 tax return and include the deduction. Result: you receive the tax benefit in 5-6 months from when you paid.
Scenario B: renovation in January 2027
You pay for the work in January. The deduction belongs to the 2027 tax year, so you can’t include it until your April-June 2028 return. Result: you wait 15-17 months to see that money. And that’s assuming the deduction is still in force in 2027, which isn’t guaranteed today.
Scenario C: renovation in September 2026
You pay in September. Same result as scenario A — you deduct in April 2027 — but with an additional advantage: you’ve avoided the year-end rush. Materials are available, work timelines are more relaxed, there’s no calendar pressure.
In cash flow terms, the difference between renovating in November and renovating in January can be more than a year in fiscal recovery time. Same expenditure, same work, same benefit. Just that one gets it back in spring and the other in the spring of the following year.
Use the budget calculator to estimate the cost of your renovation and calculate how much you could deduct.
Which bathroom renovations qualify for tax benefits
Not all renovations generate a right to deduction. There must be an accessibility component, an energy efficiency component, or both.
Accessibility improvements
- Bathtub to flush-to-floor shower: the most common case. A flush tray with non-slip surface removes a direct architectural barrier.
- Grab bars and handrails: in the shower area and next to the toilet.
- Non-slip flooring: pavement with slip-resistance certification (class C in wet areas).
- Removal of steps or level changes and door widening (minimum 80 cm clear passage).
Energy efficiency improvements
- Insulation of exterior walls: if the bathroom faces outside, adding insulation reduces energy demand.
- LED lighting with presence sensors.
- Thermostatic taps and flow reducers: less hot water consumption, less energy.
- Heat recovery ventilation in comprehensive renovations.
Comprehensive renovations: the double benefit
If your renovation includes both accessibility and efficiency improvements, you can claim both deductions in the same tax year, provided the items are separated on the invoice. One renovation, two deductions.
Check our guide to grants and subsidies for bathroom renovation for a complete overview. And remember that the reduced 10% VAT can be combined with these deductions — they’re independent concepts.
Tax calendar: dates and figures you need to know
| Item | Time requirement | Deduction | Maximum base | Maximum saving |
|---|---|---|---|---|
| Accessibility (income tax) | Payment within the tax year (1 Jan - 31 Dec) | 20% | €5,000 | €1,000 |
| Energy efficiency (demand reduction) | Work completed and paid before 31 Dec 2026 | 20% | €5,000 | €1,000 |
| Energy efficiency (primary consumption) | Work completed and paid before 31 Dec 2026 | 40% | €7,500 | €3,000 |
| Reduced VAT (10% vs 21%) | Habitual residence +2 years, natural person | VAT saving | No limit | ~€660 on €6,000 renovation |
Absolute key date: December 31st, 2026. Any invoice paid after that date belongs to the 2027 tax year.
Tax return date: April-June 2027 for the 2026 tax year. That’s when you materialise the saving.
Documentation needed: invoices with item breakdown, proof of payment (bank transfer, never in cash for amounts over €1,000), and for energy efficiency, the energy performance certificate before and after the work.
All the regulations are published in the Official Gazette (BOE) and binding consultations on the Tax Agency website.
The December avalanche and how to avoid it
Every year the same thing happens: October arrives, people do the maths and suddenly everyone wants to renovate before December 31st. Saturated warehouses, work teams with no availability, timelines that stretch. We see it every year.
The solution? Plan three or four weeks ahead. That changes everything.
Step 1: Get your quote in September or October
Use our online calculator for an initial estimate and request a visit for the definitive quote. In September there’s no queue. In December, there is.
Step 2: Finalise materials before November
Tiles, shower tray, taps, shower screen — everything has a delivery time. Some porcelain tiles take 2-3 weeks. If you order in October, you have them in time. In November it’s already tight.
Step 3: Execute between October and early December
A bathroom renovation takes between 5 and 10 working days. Starting in the first week of December, you’ll have it paid before Christmas.
Step 4: Book with a guaranteed date
At Reformarte we give a start date guaranteed by contract. If we say December 2nd, we start on December 2nd. No “we’ll see”. In December, that’s worth its weight in gold. Check how it works in our process.
Can a renovation be split across two tax years?
Yes, and it can be a smart strategy. But it needs to be done properly.
When it makes sense
If your renovation is large — say the budget exceeds €10,000 — you can divide payments between two tax years to take advantage of the maximum deduction base in both years.
Concrete example: comprehensive bathroom renovation for €12,000.
- Option A: Pay everything in 2026. Accessibility deduction base: €5,000 (cap). Deduction: €1,000. You lose the deduction on the remaining €7,000.
- Option B: Pay €6,000 in December 2026 and €6,000 in January 2027. Deduction in 2026: €1,000. Deduction in 2027: €1,000 (if the deduction continues). Total: €2,000.
Note: this only works if the work is invoiced in two genuine phases. A fictitious invoice won’t do. There must be a phase executed and paid in each tax year — for example, demolition in December and finishes in January.
The risk
If the deduction isn’t extended for 2027, you end up with €1,000 instead of €2,000. And that risk is real. Our view: unless the renovation is very large, maximise the deduction within the current year. A bird in the hand.
Frequently asked questions
Can I deduct the renovation if the bathroom is in a second home?
No. Accessibility and energy efficiency deductions only apply to the habitual residence. Beach flat in Gandia, country house — no income tax deduction. You can benefit from the reduced 10% VAT if you meet the requirements, but the income tax deductions, no.
What if I pay part in cash?
Bad idea. For amounts over €1,000, cash payments are not deductible and can create problems with the Tax Agency. Always pay by bank transfer or card — it’s the only way to have a dated receipt that the Tax Office will accept.
Do I need an energy performance certificate for the deduction?
For the energy efficiency deduction, yes. You need a certificate before and after the work, demonstrating the minimum improvement (7% in demand or 30% in primary consumption). For accessibility, you don’t — a detailed invoice and proof of payment are sufficient.
Can I combine the tax deduction with a public subsidy?
It depends. In general, the deduction base is reduced by the amount of the subsidy received. €5,000 renovation with a €1,500 subsidy = deduction base of €3,500. You don’t deduct the same expense twice, but you do combine both benefits. See our complete grants guide for all the options in the Valencia region.
What if my renovation is delayed and doesn’t finish before December 31st?
If the work doesn’t finish and you can’t pay before December 31st, the deduction moves to the following tax year. You don’t necessarily lose it — if the deduction remains in force — but you delay the benefit. That’s why we insist on planning with a margin: starting in October gives you a cushion even with unexpected issues.
The time is now, not November
It’s March. December seems miles away. But that’s precisely what gives you the advantage. While other homeowners will discover these deductions in October and panic, you can plan calmly and secure a work date that suits you.
At Reformarte we’ve been helping our clients take advantage of the tax benefits of their renovations for years. We’re not tax advisers — we always recommend consulting one — but we know the process, we know what documentation you need and we structure invoices so the Tax Office doesn’t raise objections.
Start with the budget calculator. Free, two minutes, realistic estimate.
Don’t leave money on the table. Not this year.
