VAT falls due before your customer pays — and electronic invoicing removes the discretion

Output VAT is accounted for by reference to the date of supply, and the issue of a tax invoice is one of the events that fixes it. Where credit terms are granted, the tax is therefore settled before the corresponding cash is received. This has been the position since 2018 and is well understood in principle; in practice it has been softened by the fact that the issue date of an invoice has largely been within the supplier's control.

Electronic invoicing changes that. Once an invoice is transmitted through an accredited service provider, its issue date is registered as it is issued. The timing ceases to be a matter of internal practice and becomes a matter of record. For businesses that have managed the position informally, the working capital effect will become visible in the first affected period.

The rule

Under Federal Decree-Law No. 8 of 2017, the date of supply is the earliest of the date goods are delivered or services performed, the date payment is received, and the date the tax invoice is issued. A tax invoice must be issued within 14 days of the date of supply. VAT is reported and paid on the return for the period in which the date of supply falls, and both the return and the payment are due within 28 days of the end of that period. Businesses with annual turnover below AED 150 million are generally allocated quarterly periods and those above it monthly, although the Authority may assign or alter a registrant's tax period.

Contracts involving periodic payments, successive invoices or continuous supply are governed by a separate date of supply rule rather than the general test above. This is material for subscriptions, support and maintenance contracts, retainers and long-term service arrangements, and those arrangements should be tested under the special rule.

Nothing in this depends on whether the customer has paid.

What that means in cash terms

The exposure is not universal, and it is worth being precise about when it arises. Quarterly filing provides a substantial buffer: an invoice issued at a random point in a quarter is settled with the authority, on average, 73 days later — 45 days to the period end, plus the 28-day window. Where customers pay within 60 days, the cash generally arrives first.

The position reverses in three circumstances.

For a business with AED 1.5 million of standard-rated revenue a month, the first case ties up approximately AED 42,500 of working capital at any given time. The amount itself is manageable; the sensitivity is the point — the gap is created by terms and timing rather than by volume, and a single large invoice issued days before a period end is settled with the authority long before it is paid.

The exposure is therefore concentrated in businesses that grant extended terms, file monthly, or invoice significant amounts close to a period end — and in those whose customers pay late irrespective of the terms agreed.

When this begins to apply to you

The electronic invoicing mandate is phased. A pilot runs from 1 July 2026. Businesses with annual revenue of AED 50 million or more must have appointed an accredited service provider by 30 October 2026 and issue electronically from 1 January 2027. Businesses below that threshold follow from 1 July 2027, and government entities from 1 October 2027.

Why electronic invoicing changes the practical position

Three practices lose their room to operate once invoices are transmitted and registered as they are issued:

• Holding an invoice back until the customer is ready to pay. The date of supply may already have been triggered by performance, but the informal approach of delaying issue is no longer invisible.
• Dating an invoice into the following period. The registered issue date is what is recorded.
• Entering invoices into the accounting system after the period end. Under the new model the invoice originates in the system and is transmitted at issue, so the record and the return are built from the same source.

None of these were correct positions before; they were, however, difficult to observe. The change is in enforcement and visibility rather than in the underlying rule.

Legitimate ways to manage the timing

• Proforma invoices. A proforma is not a tax invoice and does not, by itself, trigger the date of supply. It does not, however, defer VAT where another statutory event has already occurred — delivery, performance, or receipt of payment or an advance. It remains available for advance requests and quotations, and is outside the scope of the electronic invoicing mandate.
• Milestone alignment. Where invoicing follows performance milestones, aligning the invoice with actual completion can defer the date of supply — but only where the milestones represent genuine, separately identifiable stages of performance, and subject to payment timing and the special rule for continuous supplies. A contractual label does not displace the facts.
• Bad debt relief. Where an invoice becomes uncollectible, the output VAT may be recovered subject to cumulative conditions: the tax has been accounted for and paid, the consideration has been written off in the supplier's books, more than six months have elapsed from the date of supply, and the customer has been notified of the amount written off.
• Credit terms and forecasting. The VAT timing should be reflected in the cash forecast and, where terms are being negotiated, in the terms themselves.

What to review before the mandate applies to you

• Quantify the exposure on your own invoice profile, particularly for invoices issued in the final weeks of a period.
• Establish who decides the invoice date, and on what basis, once that decision is registered externally.
• Confirm that the process for issuing invoices is capable of producing them on the day of supply rather than at month end.
• Review whether bad debt relief has been claimed where it was available; the relief is frequently overlooked.
• Where terms are long and invoices large, consider whether the cash forecast reflects the tax settlement dates.

Model your exposure

A calculator estimating the funded period and the working capital absorbed, based on your revenue, terms and filing frequency, is available at involane.com/tools/vat-cash-gap-calculator.

Sources

Where this page and a source disagree, the source is right. Tell us: hello@involane.com

• Federal Decree-Law No. 8 of 2017 on Value Added Tax — UAE Federal Tax Authority

Regulatory statements on this page come from the sources above. Anything about how long work takes, what it costs, or what companies typically do is our own estimate — it is not in any of them, and it carries no more weight than an estimate.

This material is provided for general information only and does not constitute tax, legal or accounting advice. Requirements and thresholds change; positions depend on individual circumstances. Consult a qualified adviser before acting. Position as at July 2026.