Sofía received a flat on the coast from her parents in April 2026. She filed Modelo 651, the gift tax return, on time, with the notary's help, but did not pay: the tax came to €14,200 and she thought she would sort it out later. This is the case we are going to follow, because it separates clearly two situations people mix up: having declared without paying, which is Sofía's, and having neither declared nor paid. The first ends in the apremio, the enforced collection procedure, and, if nothing is done, in attachment. The second adds a penalty. In both, the flat is charged with the payment.
Filing without paying is not the same as disappearing
| Filed Modelo 651 and did not pay | Neither filed nor paid | |
|---|---|---|
| What the administration starts | Collection in the enforcement period, from the day after the end of the deadline | A procedure to check and assess the tax |
| Surcharges | 5 %, 10 % or 20 % depending on when payment is made | Those of the enforcement period, if the assessment is not paid either |
| Late-payment interest | Only with the 20 % surcharge | From the end of the deadline to the assessment |
| Penalty | Not for non-payment: the debt is already declared | Yes, under article 191 of the Ley General Tributaria, Spain's General Tax Act |
| Value of the property | The one declared, without prejudice to a check | The one the administration sets |
| Land Registry | It can register, with a note of the charge | It does not register without proof of filing |
The underlying idea: Sofía has already avoided the worst step by filing. What she has left is a collection problem, not an infringement.
The timetable of Sofía's non-payment
The law does not leave the debt standing still. These are the stages it goes through, as set by articles 28 and 62.5 of the Ley General Tributaria:
- End of the voluntary period. The enforcement period starts the next day.
- Before the providencia de apremio, the formal demand for payment. If she pays the full tax, a 5 % surcharge: 14,200 × 5 % = €710, without interest.
- Once the demand is notified. If she pays within the period it sets, a 10 % surcharge: €1,420, without interest. That period ends on the 20th of the same month if it is notified between the 1st and the 15th, or on the 5th of the following month if it is notified between the 16th and the end of the month.
- Afterwards. A 20 % surcharge: €2,840, plus late-payment interest from the end of the voluntary period.
- Attachment. Accounts, salaries or pensions in their attachable portion, refunds of other taxes and, as a last resort, assets.
Between paying the day after the deadline and paying after the demand there is a €2,130 difference in surcharges, not counting interest. Time has a price even when there is no penalty.
A practical warning: all these notifications go to the address the administration has on record. If Sofía moved house and did not report it, the demand can be deemed notified by public notice without her having seen it, and the periods run all the same. Checking the address the administration holds is the first thing to do, even before doing the sums.
The flat answers for its own tax
Article 79 of the Ley General Tributaria establishes that the assets transferred are charged with the payment of the taxes levied on that transfer, whoever holds them, unless that holder is a third party protected by the public faith of the Land Registry. When the gift is registered, the Registry usually adds a marginal note warning of that charge (the afección). If Sofía tried to sell the flat with the debt still outstanding, the buyer would see it in the nota simple, the Land Registry extract, and the transaction would stop until it was cleared. In practice, selling to pay is possible, but paying at the signing itself.
And if she had filed nothing
Let us now suppose that Sofía had not filed Modelo 651. The regional administration, holding the deed, would check the value of the flat, assess the tax with interest and open penalty proceedings. Article 191 classes the infringement as minor when the base of the penalty does not exceed €3,000 or there is no concealment, and the law considers that there is concealment when the return is not filed, provided its impact exceeds 10 % of the base. With €14,200 of undeclared tax, what can be expected is a serious infringement, with a fine of 50 % to 100 %:
- Minimum penalty: 14,200 × 50 % = €7,100.
- With the 30 % reduction for agreeing: €4,970.
- With the 40 % reduction for prompt payment on top of that: €2,982.
Almost €3,000 in the best case, plus interest, against the €710 it would cost the real Sofía to pay today. The difference between the two lies in one form filed on time. How penalties are graded and reduced is in the penalty and its reductions.
Some autonomous communities (Spain's regions) make their gift reductions or rebates conditional on requirements that go beyond filing: keeping the asset for a period, putting the money to a set purpose, or having paid on time. If the €14,200 is already the tax after the relief, there is little to lose; if the relief is conditional and the non-payment puts it at risk, the figure can change a great deal. Check it in your community's law before letting the enforcement procedure run.
What Sofía can do this week
Even in the enforcement period, deferral or payment in instalments can be requested, although the application does not avoid any surcharge already accrued. It is requested from the administration that collects the tax, which in her case is that of the community where the flat is located, with its own guarantee thresholds; the exemption for debts of up to €50,000 in Orden HFP/311/2023 belongs to the state tax agency, the Agencia Tributaria, and does not simply apply to a community. The mechanics are in how a deferral is requested, and an example of month-by-month instalments in the realistic timetable of an instalment plan.
If the demand has already arrived, it is worth reading it calmly: date of notification, amount, surcharge applied and deadline. An error in the notification or in the amount can be challenged; the debt itself, if it was declared correctly, cannot. You can tell us about your situation in the inheritance and gift form, and the general framework of the tax is on the page on inheritances and gifts.
What does not solve the problem
Two ideas come up when the tax weighs heavily, and it is best to rule them out early. The first is giving the flat back to the parents. A gift already completed is not erased by undoing it: giving it back is usually a new transfer, with its own tax, and the debt from the first is still there. The second is waiting for the limitation period. It is four years from the end of the voluntary period, but on a debt that Sofía herself declared and that the administration is already collecting, every collection step interrupts the count. There is no shortcut that does not go through paying, deferring or challenging the amount on solid grounds. It is developed in the four-year limitation period.
A question that always comes up: does the giver pay?
No. Article 5 of Ley 29/1987 makes the donee the taxpayer, and it is Sofía who is pursued. Her parents, as donors, have their own bill, which is not this one: the possible capital gain in their income tax (IRPF) for having given away a property that was worth more than it cost them. The parents wanting to help pay the tax is another matter, and it should be done with care, because that money is, in turn, another gift.