Cash accounting for VAT: when it really helps cash flow

VAT cash accounting is not an “automatic Tax Agency deferral”. It is an optional special regime: you delay paying output VAT until you collect, but you also delay deducting input VAT until you pay, and there is a time cap that does not forgive invoices left open forever.

The special cash-accounting regime lets you delay accrual and payment of output VAT until you collect from customers and, at the same time, delays deduction of input VAT until you pay suppliers, with a hard stop on 31 December of the year immediately after the year of the operations. AEAT, cash accounting; VAT Law, article 163 terdecies.

This guide looks at the cash-flow decision: when the regime really eases the quarter, what proof it demands and what happens on exit. It does not replace the operational modelo 303 manual or analysis of your case. Scope: Spanish state VAT territory. Foral regimes, the Canary Islands and IGIC, Ceuta and Melilla, and box-by-box 303 design are out; for that collections, payments and year-end circuit there is the programmatic page on modelo 303 and cash accounting.

What changes versus the general regime

Under the general regime, VAT accrues on the supply or service (with the ordinary rules on advances), not on collection. A customer’s deferred payment does not, by itself, delay VAT payment or the right to deduct. AEAT, cash-accounting FAQs.

Under the special regime, the tax accrues on total or partial collection for the amounts actually received; if there is no collection, on 31 December of the year immediately after the operation, unless accrual is brought forward because the customer or supplier is declared insolvent (concurso). Deduction of input VAT for someone under the regime arises on total or partial payment, or on that same limit date if unpaid, with the same insolvency exception. VAT Law, article 163 terdecies; AEAT, FAQs.

The invoice still goes out with VAT. Charge is made when the invoice is issued and delivered, but it is treated as arising at the moment of accrual under the regime. VAT Law, article 163 terdecies.Two. That is why the invoice PDF is not enough to know what enters the quarter’s 303: you need the collection or payment trail.

An official AEAT example clarifies the cap: if you supply in the first quarter of a year, collect half in May of that year and the rest in May two years later, the second tranche accrues on 31 December of the year after the operation, not when the money finally arrives. AEAT, FAQs. In practice, many people keep only the first half of the sentence (“I pay when I collect”) and forget that date.

Who can opt (and who cannot)

It may be applied by taxable persons whose volume of operations in the previous calendar year did not exceed €2,000,000, calculated as if ordinary accrual applied. Those who collect more than €100,000 in cash from the same recipient in the calendar year are excluded. VAT Law, article 163 decies; AEAT, cash accounting.

Volume of operations is taken excluding VAT and, where relevant, equivalence surcharge or flat-rate compensation; it includes previous-year supplies and services, including exempt ones, with specific exclusions (occasional property supplies, investment goods, certain non-habitual financial and investment-gold operations). Operations are treated as carried out when ordinary accrual would have arisen. AEAT, FAQs; VAT Law, article 163 decies.Four.

That detail matters for cash flow: you may have collected less than two million and still exceed the threshold if you measure by general accrual. The AEAT gives the example of sales collected for €1.5 million with €1 million outstanding: volume for the regime still follows the general rule and can push you out. AEAT, FAQs.

If you start activity in the current year, you may apply the regime that year. The following year, volume from the start year (annualised where required), the cash-collection limit and absence of renunciation condition continuity. AEAT, FAQs; VAT Law, article 163 decies.

The regime covers all of the taxable person’s operations in the tax territory, with legal exclusions: among others, certain special regimes, exports and intra-EU supplies of goods, intra-EU acquisitions, reverse-charge cases, imports and equivalents, and self-supplies. VAT Law, article 163 duodecies; AEAT, cash accounting. You cannot reserve it for “customers who pay badly” and leave the rest out.

When it does help cash

The regime helps cash flow when you invoice on deferred terms and collect later than the ordinary VAT calendar, and when you can evidence each collection and each payment. It loses sense if you pay suppliers cash while customers defer, if you cannot link bank movements to invoices, or if the formal burden outweighs the cash saving.

Profile where it usually fits

B2B businesses with 30-, 60- or 90-day terms, enough margin and purchases that are also paid with some deferral. Output VAT does not leave the pocket in the quarter of supply if you have not yet collected; input VAT is not deducted until you pay. The cash net improves when customer collections and supplier payments move at similar rhythms, or when customer deferral is the real bottleneck.

It also helps in seasons with billing peaks and collections concentrated later: you avoid financing “paper” VAT for a quarter with liquidity that has not yet arrived. That does not turn the regime into a financial product; it only aligns VAT payment with money received, inside the legal limit.

What you must be able to prove

The law requires evidence of the moment of collection or payment, total or partial. VAT Law, article 163 terdecies. In practice that means date, amount and means for each movement, linked to the invoice. Without that link, the cash benefit becomes a risk of an incorrect assessment.

If you collect by remittance, cheque, promissory note or bill of exchange, the AEAT recalls criteria for when payment is treated as received (for example, credit to the creditor’s account on remittances; discounting a promissory note does not release the debtor for accrual purposes). AEAT, FAQs. Before you opt, ask your gestoría how you will capture those dates in the book, not only on the bank statement.

When it does not help (or makes the quarter worse)

Double cash: the flip side of deduction

If you pay supplier invoices, rents or stock in cash and your customers pay at 60 days, you delay VAT to pay… and also VAT to deduct. The net result can be worse than under the general regime: you used to finance output VAT but recovered input VAT quickly; under cash accounting, deduction waits for payment and you have already paid.

That effect worsens if a material share of your purchases comes from suppliers in cash accounting even when you are not: the recipient defers deduction until payment, with the same time limit. VAT Law, article 163 quinquiesdecies; AEAT, cash accounting.

31 December of the following year

The time limit turns many unpaid invoices into VAT to pay even though the money has not arrived. It is not an indefinite credit against the Tax Agency. When that date arrives, later collection does not regenerate the accrual already produced. AEAT, FAQs; VAT Law, article 163 terdecies.

If your real problem is structural non-payment, the regime may postpone the hit by one or two years and then concentrate it. You still need to collect, chase and, where the rule allows, adjust the taxable base; cash accounting does not replace a healthy receivables book or deferral of an already assessed debt.

Formal burden and operating cost

Issued-invoice books must include collection dates with separate amounts and the account or means of collection; received-invoice books must include payment dates, amounts and means; and issued invoices must carry the mention “régimen especial del criterio de caja”. AEAT, formal obligations.

Operations are entered in general deadlines as if there were no special regime, then completed with collections or payments when they occur. AEAT, FAQs. If your accounts today do not separate invoice, outstanding balance and bank movement by document, the regime multiplies quarterly work instead of easing it. The checklist on what your accountant should do each quarter helps fix who captures collections and who closes the 303.

Customers and negotiation

The invoice mention warns the recipient that their deduction waits for payment. For some customers that is irrelevant; for others, if they need to deduct in the quarter of receipt, it can strain negotiation. It is a legal effect of the regime, not a cosmetic PDF detail. VAT Law, article 163 quinquiesdecies.

In channels with heavy collection friction — marketplaces, gateways, returns — the useful question is not only “do I opt?”, but whether your map of effective collection dates is clear. The guide to ecommerce tax advice and fiscal controls fits when money does not arrive at the same moment the invoice is issued.

Opt-in, rollover, renunciation and exclusion

The option is exercised on registering the activity or in the December census return before the year of effect; it rolls forward unless renounced. VAT Law, article 163 undecies; AEAT, modelo 036 — cash accounting.

Renunciation is notified by census return in December before the year it should take effect and has a minimum validity of three years. AEAT, FAQs; AEAT, modelo 036 — cash accounting. You do not enter and leave every quarter. If you opt “to try three months”, you accept the cost of being out for at least three years when you renounce.

Exclusion for exceeding volume of operations during the calendar year pushes you out of the regime; operations carried out while it applied keep cash-accounting rules. VAT Law, article 163 quaterdecies; AEAT, FAQs. Leaving does not wipe the history of open invoices under the regime overnight.

Renunciation has a minimum validity of three years. Exclusion for exceeding volume does not erase cash rules on operations already carried out under the regime. The 31 December following-year limit turns many unpaid invoices into VAT to pay even though the money has not arrived. VAT Law, articles 163 undecies, 163 quaterdecies and 163 terdecies; AEAT, FAQs.

Before you opt or renounce in December, calculate with real numbers: output VAT pending collection, input VAT pending payment, expected collection calendar and your system’s (or gestoría’s) capacity to record means and dates. A decision without that map is almost always expensive.

What modelo 303 asks beyond “cash” VAT

The option is exercised on registering the activity or in the December census return before the year of effect; it rolls forward unless renounced. Books and invoices must record collection or payment dates and amounts, the means used and the mention “régimen especial del criterio de caja”. Modelo 303 declares VAT on a cash basis and also reports operations as if the general rule had applied. AEAT, formal obligations; AEAT, modelo 303 instructions (2026); AEAT, modelo 036 — cash accounting.

The information boxes (bases and amounts “as if” article 75 had applied) are not decoration: they feed control and volume. The 2026 instructions detail, for those under the regime and for affected recipients, supply and acquisition amounts under the general accrual rule. AEAT, modelo 303 instructions (2026). If your gestoría only looks at the amount to pay and does not reconcile those figures, the regime is only half done.

This page does not replace the procedure for allocating partial collections invoice by invoice. For that operating detail — balances by invoice, suppliers under the regime, year-end close — use the modelo 303 with cash accounting guide.

Quick decision test

Before you tick the census box, write three figures on a sheet:

Output VAT you would pay today on sales already supplied and not yet collected. If the figure is small, the cash saving is too.
Input VAT you stop deducting because you pay late… or, conversely, that you defer on purchases you have already paid cash. Subtract that effect from the saving above.
An honest answer on whether you can evidence date, amount and means per invoice, including partial collections and suppliers under the regime. If the answer is “we’ll look at the statement at month-end”, operating risk usually beats the benefit.

When the first figure is large, the second does not cancel it and the third is covered, the regime can help. If deferred deduction dominates or proof fails, stay on the general regime or fix the collection and payment circuit first. Cash accounting does not tidy a chaotic quarter; it makes it more demanding.

Frequent decision mistakes

Treating the regime as non-payment insurance. 31 December of the following year still exists.

Forgetting the effect on the recipient and on your own purchases. Double cash and invoices from suppliers under the regime change the net.

Measuring the €2,000,000 threshold only on what was collected. Volume is calculated under ordinary accrual. AEAT, FAQs.

Renouncing cold because “this quarter hurts”, without looking at the three-year minimum or the stock of operations still under cash rules. VAT Law, articles 163 undecies and 163 quaterdecies.

Confusing this regime with deferral of an already self-assessed debt. They are different tools: one moves the moment of accrual; the other manages payment of an identified debt.

What to do now

List issued invoices pending collection and received invoices pending payment, with expected dates.
Estimate VAT on both columns under the general regime and under cash accounting (including the 31 December following-year horizon).
Check with your gestoría whether the book and bank allow recording means, amount and date per document.
If the option or renunciation hits December, leave margin for the census return; do not leave it for the last business day.
If the bottleneck is closing the 303 and not the opt-in decision, move to the modelo 303 and cash accounting procedure.

To fit the control into the quarterly engagement, use what your accountant should do each quarter. If you sell online and collection does not match the invoice, also review ecommerce tax advice. If you need a concrete engagement, see TaxFactory’s tax and accounting service or contact the team. This page does not decide your census option or assess your 303.

Frequently asked questions

Does cash accounting avoid paying VAT on unpaid invoices forever?

No. It delays accrual until total or partial collection, but if you do not collect, VAT accrues on 31 December of the year immediately after the transaction, unless accrual is brought forward because the customer or supplier is declared insolvent (concurso). After that, a late collection does not recreate that same accrual.

If I opt for cash accounting, will I also defer deduction of VAT on my purchases?

Yes. It is double cash accounting: output VAT waits for collection and input VAT waits for payment, with the same 31 December of the following year limit. If you pay suppliers before you collect from customers, cash flow can get worse.

Can I apply the regime only to some customers?

No. The regime covers all of the taxable person’s operations in the tax territory, with the legal exclusions (exports, intra-EU supplies, reverse charge, imports, self-supplies and certain special regimes, among others).

How do you opt in or renounce?

The option is notified when registering the activity or in the census return during December before the year it should take effect. Renunciation also goes through a December census return and has a minimum validity of three years.

What happens if my volume of operations exceeds €2,000,000?

You are excluded from the regime. Volume is measured under the ordinary accrual rule, not only on what was collected. Operations carried out while the regime applied keep cash-accounting rules until collection or the legal limit.

Can my customer deduct the VAT on my invoice before paying me?

If the invoice carries the regime mention and is covered, the recipient — whether or not they are in cash accounting — defers deduction until payment, or until 31 December of the following year if they do not pay. That can shape commercial negotiation.