The short answer
System-to-system integration is an integration between your own software and eTIMS and Buyer-initiated invoicing is a change to who raises the invoice rather than to what you install. The choice follows from how your business issues invoices: how many, how fast, and whether the connection holds while you do it.
Side by side
| System-to-system integration | Buyer-initiated invoicing | |
|---|---|---|
| Kind of thing | An integration between a business's existing software and eTIMS, rather than a separate place to go and type. | An invoicing model rather than a piece of software: it changes who raises the document, not what you install. |
| Connection | Depends on setup | Depends on setup |
| Invoice rhythm | Continuous and automatic | Per supply relationship |
System-to-system integration
Your own software talks to eTIMS directly, so an invoice raised in the system the business already uses becomes an electronic tax invoice without anyone re-typing it. Continuous and automatic. The invoice is a by-product of the sale rather than a separate task someone remembers to do.
Buyer-initiated invoicing
An arrangement where the buyer raises the invoice rather than the seller. It exists because plenty of real supply relationships have a large buyer and a supplier with no system at all. The invoice originates with the party that has the system, which is the opposite of the usual direction.
How to choose between them
Our reading, not a rule. Nothing below is a statement of what KRA requires.
System-to-system integration gets awkward when
A business with no existing system, where there is nothing to integrate. Low volume, where the integration costs more than the typing it saves. A setup nobody maintains, because an integration that silently stops is worse than a manual process.
Buyer-initiated invoicing gets awkward when
Any relationship where the supplier can issue the invoice perfectly well, in which case this is a complication rather than a solution. A buyer not prepared to carry the record-keeping, because the burden moves with the document.
What the rules say
Stated by the publisher from the cited KRA material. Our reviewer has not yet re-checked it against the source, so confirm anything you are about to act on with KRA directly.
KRA identifies several categories of eTIMS solution, among them eTIMS Online, the eTIMS Client, eTIMS Lite, system-to-system integration, reverse invoicing and buyer-initiated invoicing. Which one suits a business depends on how it issues invoices rather than on what it sells.
Tax rules in Kenya change with each Finance Act and with regulations made during the year. Before acting on any figure, deadline or threshold, check the current position on KRA's own website.
This page explains how a requirement generally works. It is not tax advice, and it cannot account for the specifics of any one business. For a position you intend to rely on, confirm with KRA directly or with a registered tax agent.
Common questions
Which is better, System-to-system integration or Buyer-initiated invoicing?
Neither, as a general matter. They assume different invoicing patterns, and the one that suits a business follows from how many invoices it issues and how reliable its connection is.
When would System-to-system integration be the wrong choice?
A business with no existing system, where there is nothing to integrate.
How do I know this information is current?
Tax rules in Kenya change with each Finance Act and with regulations made during the year. Before acting on any figure, deadline or threshold, check the current position on KRA's own website.
Sources
- officialeTIMS (Electronic Tax Invoice Management System) — Kenya Revenue Authority, checked 2026-09-18
- officialKenya Revenue Authority — Kenya Revenue Authority, checked 2026-09-18