NRS e-invoicing Phase 2: the buyer-side cost nobody is pricing in.
In August, four of our best footballers were ruled ineligible for a tournament we had been training for since June.
Nothing was wrong with them. They had the kit, the company email, the sore legs from twice-weekly training. What they didn’t have was a tick against the eligibility rule before the verification deadline. We protested. The decision was final. We went into our first match without them, and we spent the rest of the tournament playing with a bench of four.
We finished fourth. We were named Most Improved Team. But I have thought about those four players more than any match we played, because the lesson has nothing to do with football.
We didn’t lose them because they were bad. We lost them because we hadn’t checked them against the rule before the deadline.
In January, a lot of Nigerian finance teams are going to learn the same lesson with their suppliers’ invoices. The cost will be considerably higher than a semi-final.
What changes in January
Phase 2 of the Nigeria Revenue Service (NRS) e-invoicing regime covers companies with turnover between ₦1 billion and ₦5 billion. It went live on 1 July 2026. Enforcement begins in January 2027. Phase 1 companies, above ₦5 billion, have been under enforcement since April 2026. Phase 3, below ₦1 billion, goes live on 1 July 2027, with enforcement from January 2028.
The NRS has set October and November 2026 as the post go-live review window for Phase 2. That is the gap between “live” and “enforced”, and it is the only time left to fix what is wrong before it starts to cost money.
Most of the attention so far has gone to the supplier side: can my system generate a compliant invoice and get it validated? That is the easy half. The half nobody is talking about is the buyer side, and that is where the money is.
The invoice that looks fine
Here is how it goes. A supplier you have worked with for years sends you an invoice for ₦10 million. It looks exactly like it always has. You approve it, pay it and post it.
Except the invoice was never validated with the NRS. On their side, nothing happened. On your side, two things just happened at once, and you will not find out about either of them until it is too late to fix.
What “validated” actually means
It is worth being precise, because the word gets used loosely.
Under the NRS system, an invoice is not a PDF. It is a structured electronic document that is transmitted to the NRS platform through an accredited Access Point, checked against the rules, and returned with an Invoice Reference Number and a cryptographic stamp. That reference is the invoice’s identity. A document without it is, for tax purposes, a piece of paper.
So when a supplier says “we are compliant”, the question is not whether their invoices look right. It is whether each one carries a reference the NRS issued. If you cannot see that reference, or verify it, you are posting a document the tax system has never heard of.
Two tax hits from one invoice
Input VAT first. A credit is only available on a valid tax invoice, and under the NRS system an invoice without an Invoice Reference Number is not an invoice for VAT purposes. On a ₦10 million invoice at 7.5%, that is ₦750,000 of input VAT that is stranded. You cannot claim it, and the supplier cannot hand it back to you.
Then the expense itself. Companies Income Tax is charged on profit after allowable deductions, and a deduction has always had to be wholly, reasonably, exclusively and necessarily incurred, and properly evidenced. An invoice the NRS has no record of gives the tax authority a ready basis to challenge that deduction on audit. If it is disallowed, the ₦10 million is added back to taxable profit. At the 30% Companies Income Tax rate plus the 4% Development Levy on assessable profits, that is 34%, which is ₦3.4 million for a company paying tax on its profits.
So one unvalidated invoice from one supplier can cost you up to ₦4.15 million. Not a penalty. Not a fine. Those exist separately under the Nigeria Tax Administration Act. This is simply money you thought you had, gone, the way our four players were gone on the morning of verification.
Now multiply that by your supplier list.
Or put your own numbers in. We built a short calculator that takes your annual supplier spend and the share you cannot yet confirm is validated, and shows what it costs in January. Try the supplier exposure calculator.
The supplier who failed to validate loses very little. You claimed the credit. You took the deduction. When the reconciliation happens, it happens in your books.
That is the structural point most companies have missed. E-invoicing compliance is not something you do once on your own side. It is something every one of your suppliers must have done, and you need to know it before the invoice is posted, not during a tax audit eighteen months later.
We learned that on a football pitch. The committee did not care that our players were good. It cared whether they were on the verified list.
Ten weeks. Here is what to do with them.
Pull your top twenty suppliers by spend. That is usually 80% of your exposure. Ask each one directly whether their invoices are validated with the NRS, and ask them to show you a reference number. “We are working on it” is a no.
Check your own house. If you are in Phase 2 and your invoices are not yet validated, your customers are about to have this same conversation about you.
Decide how invoices will be checked before they are posted. Doing it by hand for one supplier is fine. For two hundred, it is a job for a system, which is what an Access Point Provider does: it sits between your accounting software and the NRS, validates what goes out, and confirms what comes in, before anyone can claim anything on it.
Get the tax position checked, not just the technology. Half the problems we see in integrations are configuration. The other half are tax questions wearing a technology costume.
What we see when we open the hood
We have now integrated NRS e-invoicing into Sage, Microsoft Dynamics 365, Zoho Books and ERPNext environments, and built the Access Point layer that sits between them and the NRS. A few things come up every time.
The ERP is rarely the problem. The data in it is. Customer TINs that are wrong or missing, item descriptions that do not map to the required classification, VAT applied at line level in one module and at invoice level in another. Validation fails on these, not on the software.
Credit notes and cancellations trip more teams than invoices. An invoice that was validated and then amended in the ERP without a corresponding note on the NRS side creates a mismatch that only surfaces at reconciliation.
Nobody has designed the inbound side. Most companies think about the invoices they send. Almost none have a process for checking the reference on invoices they receive, which is where the ₦3.4 million lives.
And the tax questions outnumber the technical ones. Which entity is the supplier for a group with shared services? How does a withholding deduction interact with validation? What happens to an invoice issued in December and validated in January? These are not configuration questions. They are tax positions, and they need a tax practice, not a help desk.
Where we come in
Doftwerks is the technology practice of Stransact, Chartered Accountants. We hold NRS accreditation as both a System Integrator and an Access Point Provider, which puts us among a very small number of firms that can do the integration and run the validation gateway. The part I would point to is the other half of the building: a tax practice that reads the regulations with you and tells you what your particular setup means for your particular exposure. The licence gets the invoice validated. The tax practice makes sure that was the right question. Doftwerks is also ISO 27001 certified, which matters when a third party is sitting on the path between your ledger and the revenue authority.
In 2027 we will check every one of our players against the rules before registration opens. I would rather find out in June than in August.
If you are in Phase 2, I would make the same offer for your supplier list. We run a 30-minute readiness check: your top suppliers, your own validation status, and the real number at risk in January. No charge for the conversation, and you leave with a figure you can take to your board.
If you would rather see the number first, start with the calculator and bring it to the call.
Doftwerks is the Technology Practice of Stransact, Chartered Accountants, an RSM International correspondent firm. NRS-accredited System Integrator and Access Point Provider. ISO 27001 certified.
