How Long You Can Carry Forward VAT to Offset Before You Lose It

You’ve been carrying a VAT balance to offset in box 110 of your modelo 303 for two or three years now. Every quarter you enter it, and every quarter it’s still there, a bit bigger or a bit smaller depending on how the business is going. You’ve never requested the refund, partly because nobody has told you there’s any rush. Is there?

The short answer is yes, although probably not in the way you’re worried about. The money doesn’t just vanish overnight. What has an expiry date is the mechanism you’re using to recover it: offsetting it quarter after quarter. Once that date passes you have to switch to a different route, and if you don’t know that, you can end up with neither.

A quick recap before the deadlines

If the output VAT you charge in a quarter is lower than the input VAT you’ve paid, the result comes out negative and it’s carried forward to the next modelo 303 through box 110. You can check the calculation with the quarterly VAT calculator. That mechanism, and when it makes sense to request the refund instead of continuing to carry it forward, is what we covered with a full example in the previous article on VAT to offset.

And here’s where the whole thing starts, worth being clear about from the outset. Every quarter your 303 comes out in your favour, you have two paths, and they aren’t available at the same time. One is to offset: you leave the result as “to be offset” and that balance carries over to box 110 of the next quarter. It’s the automatic option, and in the first, second and third quarters it’s the only thing you can do. The other is to request the refund, so the tax office pays you the money, and you can only ask for that on the fourth quarter’s 303 (or month by month, if you’re registered in the Monthly Refund Registry, which almost no self-employed person uses), by choosing the “Refund request” option. Carrying it forward is what almost everyone does by default, but it’s exactly what starts the four-year clock this article is about.

Here we’re left with a single question that article leaves open: how long can you actually keep carrying that balance forward?

The deadline is four years, and it doesn’t start where it looks like it should

Spain’s VAT law leaves no room for interpretation here: when deductions exceed the VAT accrued in a period, “the excess may be offset in subsequent returns, provided that four years have not elapsed, counted from the filing of the return in which that excess originated.”¹

The detail that causes the most confusion is at the end of that sentence. The clock doesn’t start in the quarter when you bought the equipment or paid the invoice that generated the negative balance. It starts on the day you filed that return. If the first quarter’s result is negative and you file the modelo 303 on 15 April, the deadline for continuing to offset that balance runs out on 15 April, four years later. Not the end of the quarter, not the end of the filing window if you’d filed at the last moment: the specific day you actually filed.

A worked example

Imagine that in the first quarter of year 1, your modelo 303 comes out at -600 € and you file it on 15 April of that year. From there:

• You can keep entering that balance (or whatever’s left of it) in box 110 of the following quarters until 15 April of year 5.
• If by then you’ve offset it in full, there’s nothing more to do: the balance was absorbed within the deadline.
• If by then part of it is still unoffset, that part can no longer be offset. It doesn’t erase itself from your books, but it no longer has a place in box 110.

If in the second quarter of that same year you generate another negative balance, that second amount has its own four-year deadline, counted from the date you filed that second quarter’s return, not from the first one’s. When you’ve been carrying several quarters’ worth of balances that have piled up together, the oldest portion is the first to run out of room.

What happens once the four years are up and you still have balance left

This is where the myth of “there’s no deadline, you can carry it forward indefinitely” breaks down, and it’s worth getting right because getting it wrong is expensive. Once the four years are up, you can no longer enter that remainder in box 110.

The good news, and it’s a real one, is that the money isn’t simply lost: what changes is the mechanism for recovering it. This is how the Dirección General de Tributos (Spain’s tax rulings body) itself resolves it, echoing doctrine that comes from the Supreme Court and the Tribunal Económico-Administrativo Central: once the deadline for offsetting has run out without the balance having been absorbed, “the right to recover the undeducted excess does not lapse, although the right to offset it in later periods does, once the set deadline has elapsed, so that when the taxpayer no longer has the possibility of exercising ‘offsetting’ due to the lapse of the set deadline, the Administration must ‘refund’ the taxpayer the undeducted excess amount.”²

In other words: the four years close the door on box 110, but they open the door to a refund request filed directly with the Agencia Tributaria. That’s a different procedure from the one you request by choosing the “Refund request” option on the fourth quarter’s modelo 303 (you can only do that while the balance is still inside the normal filing cycle); here we’re talking about requesting it once you’re already outside that cycle, when offsetting is no longer an option. It’s worth raising this with your gestoría (tax advisory firm) or directly with the Agencia Tributaria as soon as you see that date approaching, not after it’s passed.

That second deadline isn’t eternal either

Before you relax completely: the right to request that refund also has a prescription period, like any right against the Agencia Tributaria. Spain’s General Tax Law (Ley General Tributaria) sets a four-year deadline to request refunds arising from each tax’s own rules, and another four years for the Administration to actually pay you once that right has been recognised.³

In practice this leaves two deadlines chained together, not one: four years to offset and, if you don’t manage it, an additional window to request the refund before that right also prescribes. That’s a lot of time in total, but it isn’t “forever,” and the longer you let the clock run without doing anything, the less room you have if something goes wrong along the way: a tax review, a change of gestoría, a rough patch in the business when details like this stop getting checked.

Don’t confuse it with the other four-year deadline

Along the way you’ll run into another four-year deadline that isn’t this one, and it’s easy to mix them up. The right to deduct an input VAT quota for the first time (entering it into some modelo 303) also lapses after four years, but counted from when you incurred it, not from when you filed a return.⁴

That’s the deadline that matters if you come across an old invoice you never declared: there, the clock runs from when you received that invoice. The one we’ve covered in the rest of this article is the one that matters once that quota is already inside a modelo 303 and being carried forward as a negative balance from one quarter to the next. They’re two different clocks that start at different moments, even though both last four years.

Why it’s worth not letting the balance run past its deadline

The simplest option, almost always, is not to reach this point in the first place. If the balance is significant, requesting the refund in the fourth quarter, using the “Refund request” option, settles the matter without having to keep track of filing dates from several years back. Continuing to offset makes sense when the amount is small and you expect to absorb it normally over the coming quarters; what doesn’t make sense is leaving it there “just in case” for years without ever checking again when the quarter that generated it was filed.

If you keep your accounts in a spreadsheet, that origin date is easy to lose track of, especially once the balance has been carried forward for a while and mixed in with the negative results of later quarters. It’s exactly the kind of detail worth having on hand, not in your head or in a file from four years ago.

How does Cuéntamo help with this?

In Cuéntamo every quarterly settlement is recorded with its own date, so the quarter in which a balance to offset originated doesn’t get lost along the way even if you carry it forward for several years. Before the window for continuing to offset it runs out, you have the figure in front of you to decide, with time to spare, whether to request the refund or keep offsetting, instead of finding out once it’s no longer an option.

If what you want is to understand where each quarter’s result comes from before you get to this point, the article on how to calculate quarterly VAT walks through it step by step.

You can try it for free at cuentamo.com.

Frequently asked questions

How long can I carry forward a VAT balance to offset?

Four years, counted from the date you filed the return in which that negative balance originated, not from the quarter in which the expense that caused it took place.

What happens if the four years run out and I still have balance left to offset?

You can no longer enter it in box 110, but you don’t lose it: you can request the refund directly from the Agencia Tributaria, a different procedure from the “Refund request” you file on the fourth quarter’s modelo 303.

Is that deadline to request the refund, once the offsetting deadline has expired, unlimited?

No. It also has a prescription period, within the general deadline Spain’s General Tax Law sets for requesting and obtaining tax refunds. Better not to let either clock run out.

Is this the same deadline I have to deduct an old invoice I never declared?

No. That’s the deadline under article 99.Three of the VAT law: it counts from when you incurred the input VAT, not from when you filed a return, and it’s the one that matters for including an old invoice for the first time.

Can I sidestep all of this without extra paperwork?

Yes. If you close the year still carrying a negative balance, requesting the refund on the fourth quarter’s modelo 303 (the “Refund request” option) settles the matter without you having to keep track of filing dates from old quarters.

References

Figures for 2026. The four-year deadline to offset VAT (article 99.Five of Ley 37/1992) has been in force since 1 January 2000, following the amendment introduced by Ley 55/1999, de 29 de diciembre (it was five years before that); the general four-year tax prescription period has been in force since 1999 (Ley 58/2003, General Tributaria, art. 66).

This article is checked against official sources and reviewed periodically. If you spot anything out of date, email us at [email protected].