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eTIMS: why expenses without an e-invoice can cost you tax

Since the Finance Act 2023, KRA can disallow business expenses not supported by an eTIMS invoice. A quarterly supplier check closes most of the gap.

Oct 2026 · By Dr Remmy Nyongesa, CPA-K

The Finance Act 2023 tied the deductibility of business expenses to valid electronic tax invoices. Where a supplier does not issue an eTIMS invoice, KRA can disallow the expense when computing income tax.

A practical routine

  • List your top 20 suppliers by spend and confirm each issues eTIMS invoices.
  • Validate invoice numbers on the KRA portal before payment.
  • Keep a file for exempt items such as salaries and bank charges.

Our Tax Health Check includes an eTIMS review.

General information, not professional advice. Rules change; check the sources above or ask us before acting. Last reviewed Oct 2026.

Dr Remmy Nyongesa, CPA-K

Founder of Renol Consulting. Researcher in Mineral Economics and Valuation at the University of the Witwatersrand and Lecturer in Finance and Accounting. About Remmy

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