The verdict in three sentences
A non-compliant invoice is rejected by large accounts and by the tax authority, and it blocks your payment. The mandatory fields — tax ID (TIN/NINEA), sequential number, date, net detail, VAT rate and amount — are not optional. VAT is only due above a turnover threshold; below it you invoice VAT-exempt, with the proper note.
Mandatory fields of a compliant invoice
| Field | Mandatory | Why |
|---|---|---|
| Issuer name + address | Yes | Legal identification |
| Tax ID (TIN/NINEA) | Yes | Tax recognition |
| Sequential invoice number | Yes | Traceability, anti-fraud |
| Issue date | Yes | Due date, terms |
| Client details | Yes | Enforceability |
| Line items + net price | Yes | Taxable base |
| VAT rate and amount | Yes (if registered) | VAT collection |
| Gross total | Yes | Amount payable |
| VAT-exemption note | Yes (if not registered) | Justify absence of VAT |
VAT rates and thresholds by country (2026)
| Country / zone | Standard VAT rate | Registration threshold (order of magnitude) |
|---|---|---|
| UEMOA (Senegal, Côte d'Ivoire...) | 18 % | ~50-100M FCFA turnover |
| Nigeria | 7.5 % | ₦25M turnover |
| Ghana | ~15 % (+ levies) | GHS ~200 000 turnover |
| Kenya | 16 % | KES 5M turnover |
Below the threshold you do not charge VAT and say so explicitly; above it you must register for VAT, collect and file it.
E-invoicing, penalties and best practice
The 2026 trend is toward e-invoicing and tighter checks on sequential numbering. An invoice without a continuous number, without a tax ID, or with incorrect VAT exposes you to assessments and penalties. Best practice: continuous numbering with no gaps, archiving, and consistency between invoice, quote and mobile money payment.
| Common mistake | Consequence | Fix |
|---|---|---|
| Non-sequential numbers | Tax rejection | Automatic continuous numbering |
| No tax ID | Invoice not recognized | Add TIN/NINEA |
| VAT charged below threshold | Collection error | Exemption note |
| VAT omitted above threshold | Assessment | Register for VAT |
| No archiving | Dispute, audit | Archive + export |
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Mini case study
Bola, who runs a small events agency in Lagos, had invoices rejected by a multinational: no TIN, no continuous numbering, random VAT. She switches to a compliant template: tax ID, automatic sequential numbers, VAT at 7.5 % clearly detailed. On a ₦2 000 000 net invoice, VAT collected is ₦150 000, now filed correctly. The result: invoices approved first time and payment terms cut from 45 to 20 days.
FAQ
What fields make an invoice legal in 2026? Name and address, tax ID (TIN/NINEA), sequential number, date, net detail, VAT rate and amount, and gross total. A single missing field is enough to get the invoice rejected.
What VAT rate do I apply? It depends on the country: 18 % in UEMOA, 7.5 % in Nigeria, about 15 % in Ghana, 16 % in Kenya. Apply the rate of the country where you are registered.
From what turnover must I charge VAT? Above the registration threshold (order of magnitude ₦25M in Nigeria, 50-100M FCFA in UEMOA). Below it you invoice VAT-exempt with the corresponding note.
What is the risk of a non-compliant invoice? Rejection by the client, non-payment, and on audit assessments and penalties. Non-sequential numbers and a missing tax ID are the most heavily sanctioned mistakes.
Should I move to e-invoicing? The 2026 trend strongly pushes for it: controlled numbering, archiving and structured transmission. An invoicing tool automates compliance and avoids manual errors.
Let's talk about your project. We set up compliant, numbered invoicing linked to your Wave/Orange Money payments. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
