Time is up. After months of phased rollouts, compliance extensions, and stakeholder briefings, Nigeria's largest companies have reached the moment the Nigeria Revenue Service has been building toward since the Tax Reform Acts took effect in January: the June 30 deadline after which non-compliance becomes an enforceable offence.

Corporate Nigeria is on a 24-hour countdown as the National Revenue Service prepares to enforce its mandatory electronic invoicing regime, leaving thousands of large companies racing to meet Tuesday's June 30 deadline or risk financial penalties from July 1. "By June 30, if you are not compliant, you will be liable for fines starting July 1," said Olumide Akinsola, Country Director of DigiTax Nigeria.

The compliance gap is alarming. More than 1,000 of an estimated 5,000 large taxpayers had complied with the e-invoicing requirement as of early in the year, meaning roughly 4,000 companies with annual turnover of ₦5 billion and above were still outside the framework, with the deadline approaching. "The NRS says the results are encouraging, but there is still a significant number of businesses outside compliance," Akinsola said.

The mechanics of the mandate are straightforward but operationally demanding. The e-invoicing system requires businesses to generate invoices digitally and transmit them to the NRS in real time or near real time before or as they are issued to customers. Each invoice is authenticated through the platform, creating a digital trail that allows tax authorities to track sales, validate transactions, and match them with tax filings, representing a fundamental departure from the self-reported monthly VAT filings that previously defined compliance.

The penalties for missing the deadline are structured to sting. Failure to allow the tax authority to deploy its technology within 30 days of notice attracts a ₦1 million penalty for the first day and ₦10,000 for each subsequent day, while failure to process taxable supplies through the fiscalisation system results in a ₦200,000 penalty plus 100% of tax due plus interest at the prevailing CBN MPR. Interest will additionally accrue at a rate of 2% above the CBN's Monetary Policy Rate.

The compliance ripple effect extends beyond the non-compliant company itself. Under the new framework, businesses can only claim VAT input credits on invoices that have been validated and transmitted through the Merchant Buyer Solution platform. Consequently, a supplier's failure to comply could directly affect the financial position of its customers.

Early adopters have reported operational benefits. Firms already using e-invoicing are reporting faster VAT filings, improved cash flow visibility, and reduced audit friction. Major corporations, including MTN Nigeria, IHS Towers, and Huawei Nigeria, were among the first to complete integration.

The second phase begins simultaneously in July 2026, targeting medium-sized businesses with annual turnover between ₦1 billion and ₦5 billion, with enforcement running from January to March 2027. The final phase targets smaller businesses with turnover below ₦1 billion, with full enforcement scheduled for 2028.

For Nigeria's 5,000 largest taxpayers, the clock stopped ticking at midnight. The question now is how many were ready when it did.

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