7 mistakes in Spain's 2025 income tax return that cost freelancers real money
Spain's 2025 Renta campaign opened April 8, 2026. The draft Hacienda provides is a starting point — not a declaration ready to confirm. For freelancers especially, accepting it without review can mean paying hundreds of euros too much.
- The draft does NOT automatically include RETA fees or your deductible business expenses
- Withholdings paid by clients must be declared so they discount from your tax bill
- Regional deductions are invisible in the draft — you must add them manually
- Individual vs. joint filing: always compare before submitting
- Capital gains and multiple income sources are critical points the draft handles poorly
- If you already filed with errors, the new rectificative return (2025) fixes it
Every year, thousands of Spanish freelancers file their Renta by confirming the draft as-is. The result: they overpay, miss deductions they're entitled to, or receive a Hacienda notice months later.
The draft is a useful starting point — it includes data Hacienda already has from employers, banks and properties. But a freelancer's economic activity has many variables Hacienda can't automatically fill in: deductible expenses, social security contributions, invoice withholdings, pension plans, family situation…
What the draft auto-includes vs. what you must add manually as a freelancer.
Confirming the draft without reviewing it
High impactHacienda's draft is built from data third parties have reported: payroll, bank accounts, mortgages. For employees it's often a good base. For freelancers it's almost always incomplete.
The draft doesn't know how many kilometres you drove for client visits, what percentage of your phone is work-related, how much RETA you paid, or what home-office expenses you can deduct. Only you have that data.
What to do: Open the draft, review each section, and compare it with your actual records from the year. Spend at least 30 minutes before pressing 'Confirm'.
This is how net income is calculated for IRPF. If the draft omits RETA or expenses, the final number is overstated.
Not including RETA fees as a deductible expense
High impactThe social security fees you paid as a freelancer during 2025 are a deductible expense from your IRPF. They directly reduce your net income — not a simple tax credit, they reduce the base before the tax rate is applied.
The draft doesn't auto-include RETA fees. Add them in 'Economic activity income' → 'Deductible expenses' → 'Social Security'.
What to do: Check your contributions certificate at the Social Security website (sede.seg-social.gob.es) or your freelancer app to get the exact amount paid in 2025.
Forgetting invoice withholdings
High impactIf you issue invoices to Spanish companies with IRPF withholding (usually 15%, or 7% during the first two years), those withholdings are money your clients have already paid Hacienda on your behalf.
By declaring those withholdings, Hacienda deducts them from what you owe — or refunds them if they exceed your tax bill. It's your money. Not declaring them doesn't mean Hacienda doesn't know (they do); it just means they won't refund what you're owed.
What to do: Sum all invoice withholdings for the year (they're in each invoice breakdown). Compare with what appears in your AEAT fiscal data. If any are missing, add them in the economic activity income section.
Ignoring regional (autonomous community) deductions
Medium impactThe central government isn't the only source of deductions. Each autonomous community offers its own, which can further reduce what you pay. The draft systematically ignores them because Hacienda doesn't have enough data to apply them automatically.
What to do: In Renta Web, go to the regional section and review your community's full deduction list. They're specific to personal situations — birth, rent, health, education — and many have income caps. Spend 10 minutes: it can be very worth it.
Not comparing individual vs. joint filing
Medium impactIf you have a partner (married or for civil purposes) or dependent children, the choice between individual or joint filing can mean several hundred euros difference. Joint filing applies a reduction of up to €3,400 on the taxable base, but may not always be more favourable if you both have similar incomes.
- One partner has no or very low income (< €3,400/year)
- One is unemployed while the other has moderate income
- Single-parent households with dependent children
What to do: In Renta Web, when you access with your partner, the simulator automatically calculates both options. Check the result before confirming — the system shows it in seconds.
Mishandling capital gains and back payments
Medium impactCapital gains and losses are one of the most error-prone sections. Sale of crypto, property, investment funds, shares, public grants, prizes… all are taxable. And acquisition values — which determine whether there's real gain or loss — aren't always in the draft.
If you sold crypto in 2025, you must declare it even if the platform sent no report. Hacienda has data from exchanges registered in Spain since 2023 (Modelo 172/173 reporting obligation).
Back payments relating to prior years are taxed in the year received but attributed to the year they correspond to — this can result in more favourable taxation and requires a specific step in Renta Web.
What to do: Gather all sale contracts, acquisition values and purchase dates before filling this section. For funds and investments, your bank or manager must provide an annual tax report.
Not keeping documentation for deductions
Medium impactHacienda doesn't ask for supporting documents when you file. But they can request them in a later audit up to 4 years later. If you don't have them, the deduction can be rejected and come with a penalty plus interest.
What to do: Use a digital folder (Google Drive, iCloud) organised by tax year. Scan receipts immediately — paper fades. Freelancer management apps like Autónomo Simple store invoices and expenses automatically.
Frequently asked questions
Are all Spanish freelancers required to file a Renta in 2026?
Yes. Hacienda clarified in 2025 that all freelancers under direct estimation must file, regardless of income. There's no minimum threshold for economic activities.
Is the RETA (social security contribution) deductible from income tax?
Yes. RETA fees are a deductible business expense that directly reduces your net income for IRPF purposes. If the draft omits them, you must add them manually in the economic activities section.
What if I've had 15% withholdings on my invoices but don't declare them?
Hacienda already knows about them because your clients declared them in Modelo 190. But if you don't include them as a credit in your return, you can't offset them — meaning you overpay.
Can I correct mistakes in my 2025 return after filing?
Yes. The 2025 novelty is the rectificative self-assessment (autoliquidación rectificativa), replacing both the complementary return and the old rectification request. It's a single process via Renta Web.
Where do I find my applicable regional deductions?
The AEAT website has a section per region listing all active deductions. Inside Renta Web itself, when you reach the regional section, there's a direct link to the full catalogue.
When does joint filing make sense with a partner?
If one partner has no or very low income, joint filing can save up to €3,400 via the joint-filing reduction. Renta Web's simulator calculates both options in seconds — always check.
Prepare your Renta with your data already organised
Autónomo Simple records your invoices, expenses and quarterly payments throughout the year. When tax season arrives, your numbers are ready: RETA fees, withholdings, instalment payments and income base.
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