E-Invoice Transition Obligation and Thresholds

For most businesses, the answer to the question of switching to e-invoice depends on a single figure: the gross sales revenue of the previous year.

However, things are not quite that one-dimensional. Your industry, sales channel, and the fiscal period in question can all change the outcome. In this article, we lay out the logic; as the numbers are updated every year, you will need to verify them from their original source.

How the thresholds work

The rule works like this: if your gross sales revenue exceeds the designated threshold in a fiscal period, you are required to become an e-invoice user starting from the beginning of the second following year, not that same year. In other words, there is a preparation window between the year the revenue threshold is exceeded and the mandatory transition date.

Businesses that miss this window generally experience this scenario: they realize they've exceeded the revenue limit, think "we'll look into it next year," and by the transition date, they haven't even applied for their financial seal.

When you become an e-invoice user, e-archive invoice also comes into play: documents you issue to customers who are not e-invoice taxpayers are issued as e-archive invoices. We explained the differences between the two in detail in this article.

General thresholds and sector-specific limits

There is a general revenue threshold; alongside this, much lower thresholds apply to certain sectors. The main groups subject to lower thresholds are:

Internet-based sellers. Taxpayers who make sales through their own websites, marketplaces, or social media. If you are on the e-commerce side, plan ahead by assuming the threshold is significantly lower than the general limit.

Real estate and motor vehicle trade. Those engaged in construction, manufacturing, buying-selling, or leasing activities.

Intermediary and brokerage activities. Those who conduct business in their own name on behalf of others.

Aside from these, there are also groups mandated regardless of their sector: e-commerce intermediary service providers, activities subject to specific licenses, and taxpayers who have previously fallen under the e-ledger scope.

Note on figures: Both general thresholds and sector-specific limits are updated through communiqués. This article explains the logic behind the thresholds; verify the applicable amounts from the current communiqué published by the Revenue Administration (GİB) or consult your financial advisor.

Is it smart to switch before it's mandatory?

For most businesses, yes. There are two practical reasons for this.

First, you cannot issue a paper invoice to a customer who is an e-invoice taxpayer — the other party is expecting it through the system. As the number of e-invoice users in your customer portfolio grows, voluntary transition naturally becomes inevitable.

Second, hidden costs such as document printing, shipping, archiving, and tracking lost invoices disappear entirely. We demonstrated how the invoicing workflow operates in the step-by-step e-invoice article.

Pre-transition checklist

Financial seal / e-signature. Don't forget that there are application and delivery timelines; don't leave it to the final week.

Method decision. Portal, private integrator, or integration. The integrator selection article includes a comparison.

Cleaning up current accounts. Current accounts with missing or incorrect tax numbers cause problems on the very first invoice after transition. We covered proper account structuring in the current account tracking article.

Products and VAT rates. An e-invoice issued with the wrong rate is harder to correct than a paper invoice. Check out the VAT rate selection article.

Frequently asked questions

I exceeded the revenue limit but didn't notice, what happens?

Issuing paper invoices after the obligation has started can be subject to special irregularity penalties. Because each issued document is evaluated separately, the total amount can add up quickly.

Are sole proprietorships also included?

Yes. Thresholds look at revenue and activity subject matter, not company type. Sole proprietorships can use an e-signature instead of a financial seal.

Does switching to e-invoicing also make e-ledgers mandatory?

These are separate applications with different scopes. We addressed this topic separately in the e-ledger calendar article.

Can I apply before the transition date?

Yes, voluntary transition is possible. Switching a few months before the mandatory date to learn the system during a calm period is our most frequent recommendation.

The easiest way to track thresholds is to keep your revenue in a place where you can see it throughout the year. That way, you won't face any surprises at year-end.

Open a free account on Qolay.App and manage your sales and e-document processes from a single place.