e-Fatura and e-Defter 2026: current revenue thresholds and mandate timeline

Picture a small business that had an unexpectedly strong year selling on Trendyol and Instagram — turnover crossed a line it had never come close to before. The owner celebrates the growth, and then, a few months later, a message from the mali müşavir (tax advisor) lands: "You have to move to e-Fatura this year; your paper-invoice days are over." That, in practice, is what the whole e-Fatura and e-Defter 2026 revenue threshold conversation comes down to — a system that is optional one day becomes mandatory the moment turnover clears a line, and that line drops a little lower every year.

This guide walks through the logic of Turkey's e-Fatura, e-Arşiv and e-Defter mandates for 2026 end to end: what each document does, who falls into scope, how the transition timeline works, the three routes to compliance, and what non-compliance costs. Because the exact figures change with every GİB circular, we explain the mechanism rather than drilling a number into memory — and we recommend confirming the current threshold with GİB or your mali müşavir every time.

1Prior-year turnover2Threshold / sector3Mandate4Switch (portal/integrator)

First, the terms: what e-Fatura, e-Arşiv and e-Defter each do

The three are constantly confused, yet they do different jobs. e-Fatura is an invoice exchanged between two registered e-Fatura taxpayers, without paper, through the GİB system — both buyer and seller must be enrolled. e-Arşiv Fatura is the electronic invoice you issue to someone who is not an e-Fatura user — an end consumer, for example — where the recipient does not need to be in the system. For a closer look at the split, the difference between e-Fatura and e-Arşiv is a good starting point.

e-Defter is a different layer entirely: not an invoice, but the journal and general ledger kept electronically and filed to GİB together with a berat (seal). In other words, e-Fatura digitizes the sales document while e-Defter digitizes the accounting record. We covered how e-Defter works separately; here the focus is who these three obligations catch in 2026, and when.

The 2026 logic: why e-Fatura thresholds keep dropping

The system rests on a simple intent: to shrink the informal economy, GİB wants more taxpayers on electronic documents every year. It does this on two fronts — it lowers the revenue (gross sales) threshold step by step and it adds new sectors to the scope. The upshot is that an SME which shrugged "my business is small, this doesn't concern me" last year can find itself inside the scope with the next circular.

In recent years the general e-Fatura threshold has been applied at around 3 million TL in annual gross sales, while e-commerce and certain higher-risk sectors sat far lower, near 500,000 TL. But these figures can be revised with every VUK general circular, so they are not numbers to memorize in isolation. Always verify the current threshold for your own situation from GİB's official announcement or with your mali müşavir — trusting last year's figure is exactly how a business ends up in scope but late.

A second force accelerates that squeeze: inflation. Turnover is measured in nominal TL, so a business whose real size is unchanged still sees its figures swell each year and can clear a fixed or falling threshold on its own — pulled in on price increases alone, with nothing about the business itself having changed. Even when GİB holds the number steady, the scope widens by itself; check the line as revenue accelerates, not at year-end.

Once the threshold is crossed there is no going back; even if turnover falls the following year, the e-Fatura obligation stays.

Who becomes obligated?

There are three separate doors into the scope, and clearing any one of them is enough on its own:

• By the revenue threshold: any taxpayer whose prior-period gross sales exceed the line GİB sets is pulled into scope, regardless of sector.
• By sector: some sectors — fuel, goods under special consumption tax (ÖTV), online-advertising intermediaries — are obligated no matter how large or small their turnover.
• By e-commerce and marketplace activity: businesses selling on marketplaces like Trendyol and Hepsiburada, or through their own site, are brought in at a much lower revenue threshold — sometimes directly.

That third door is the fastest-growing trigger of recent years. We laid out the broader picture of how online sales are taxed in e-commerce taxation for SMEs. A similar logic drives the e-Adisyon mandate for restaurants and cafés: GİB keeps widening scope by tailoring the document type to the sector.

How the transition timeline works

The timeline follows a "year N, based on year N-1 turnover" rule. If a year's revenue clears the threshold, the obligation begins the following year, and the switch usually has to be completed by a set month of that year — in practice most often the seventh month, the start of July. That leaves a window of a few months for application, integration and testing.

A concrete example makes it click: a business whose 2025 turnover clears the threshold applies in the first half of 2026, switches to e-Fatura by July, and usually picks up its e-Defter obligation at the start of the next accounting period, in January 2027. Because dates can shift by circular, treat this as the logic — "this year's turnover, next year's obligation" — not a fixed calendar.

e-Defter typically comes one step behind: a taxpayer in e-Fatura scope usually also keeps e-Defter from the start of the following accounting period. Because the exact date and any exemptions vary by circular, pin down your own with your mali müşavir.

e-Arşiv's own threshold

e-Arşiv carries a wrinkle of its own: even if you are not an e-Fatura taxpayer, you may have to issue invoices above a certain amount as e-Arşiv rather than on paper. That amount differs for end consumers versus registered taxpayers and is updated year to year, so the answer to "which invoices may I still print" also needs a check against the current circular. To refresh the basics of issuing an invoice correctly, our invoicing guide is worth another read.

How to comply: three routes

There are three core ways onto the e-document system, and the right pick depends on your invoice volume and existing software setup.

The GİB Portal

GİB's free portal is the most economical option for small businesses with low invoice volume. But it runs manually; entering every invoice by hand turns into lost time as volume grows, and integration options are limited.

A private integrator (özel entegratör)

GİB-authorized private integrators suit high-volume businesses that want automation; they offer uninterrupted transmission, archiving and support. In return there is a monthly or usage-based cost.

Compatible software / direct integration

If your accounting or pre-accounting software is GİB-compatible, you can issue and send the invoice from the screen you already use. We gathered what to look for when choosing the right tool in how to choose pre-accounting software.

What non-compliance costs

Issuing a paper invoice when e-Fatura is required is not just a procedural slip; that document can be treated as never issued, with concrete consequences:

• Special irregularity penalty: a penalty can apply per faulty document; because the amount is revalued each year, confirm the current figure with GİB.
• Risk on the buyer's side: an invoice deemed invalid also creates problems for the other party's VAT deduction and expense record — so your customer loses out too.
• Operational disruption: marketplaces and corporate buyers often treat e-Fatura as a precondition; non-compliance can turn straight into lost sales.

A practical checklist to prepare

Working through it in order, rather than panicking, shrinks the switch to a few days' work. The steps below are a sufficient roadmap for most SMEs:

• Measure your turnover: review last year's gross sales and your sales channels — e-commerce especially — together with your mali müşavir.
• Apply for a financial seal / e-signature: this is the most time-consuming step, so start early.
• Choose your method: pick portal, integrator or compatible software according to your volume.
• Test the flow: run a trial invoice before the first real one to validate the process end to end.

When you set this up, it helps not to treat invoicing as an island separate from the rest of the books; keeping sales, collections and the customer ledger in one place cuts the margin for error. Understanding what pre-accounting is and how it interlocks with the sales process turns the switch from a one-off obligation into a lasting system.

Frequently asked questions

In the end, 2026 is the year the question quietly shifts from "will I fall into scope" to "when and how do I switch" — as thresholds drop, more SMEs join the table. With the right preparation the transition is a one-time setup, not the burden it is feared to be. In a system that brings pre-accounting into the CRM, like Rocketly, issuing e-Fatura and e-Arşiv right next to the customer record makes compliance a natural part of daily work — so the next circular that lowers the threshold does not catch you unprepared.