Nigeria’s total public debt was about ₦159.3tn at the latest DMO reading, and the number gets quoted with alarm on its own. On its own it is the wrong lens. A debt figure only means something against what can service it — and Nigeria’s debt is not large relative to the size of its economy. It is enormous relative to the tiny slice of that economy the government actually collects. That distinction is the whole story, and most of the debate misses it by reaching for the wrong ratio.
Three ratios, three different verdicts
The same debt looks benign, worrying, or critical depending on what you measure it against:
| Ratio | Reading | What it actually tells you |
|---|---|---|
| Debt-to-GDP | Moderate — below many EM peers | Can the economy carry the stock? Broadly, yes. |
| Revenue-to-GDP | Among the lowest of any large economy | How much can the state collect? Very little. |
| Debt-service-to-revenue | ≈40% of FGN retained revenue | How much room is left to govern? Almost none. |
Debt-to-GDP is the ratio that reassures, and it is the one most commonly cited. It is also the least relevant to Nigeria, because the constraint has never been the economy’s capacity to grow into the debt — it is the government’s capacity to tax the economy at all. With one of the lowest revenue-to-GDP ratios of any large economy, the denominator that matters is not GDP; it is revenue. And on that denominator, debt service alone eats roughly 40 kobo of every naira the federal government retains.
Why the denominator is the problem
A country that collects a normal share of GDP in tax could carry Nigeria’s debt comfortably. Nigeria cannot, because it collects so little. The debt is a symptom; the thin revenue base is the disease. This is why the honest framing is not “Nigeria borrowed too much” but “Nigeria taxes too little to afford what it borrowed.” It also means the fix is not primarily on the debt side — you cannot grow or default your way out of a revenue problem — it is on the collection side: non-oil tax mobilisation, base-broadening, and closing the gap between statutory and effective rates.
Reconciliation receipt: which revenue, and what’s in the ₦159tn
Two things get quoted loosely and are worth pinning down. First, the denominator: the ~40% figure is against FGN retained revenue — what the federal government keeps after the FAAC split sends the states’ and LGAs’ share off the top. Measured against gross federally collected revenue the ratio looks smaller, but retained revenue is the honest denominator, because it is the money actually available to service federal debt. Quote the two interchangeably and you can make the burden look 10–15 points better or worse than it is.
Second, the numerator stock: the ₦159.3tn blends domestic and external debt on different underlying currencies, plus securitised Ways & Means (the CBN overdraft that was converted into formal debt). A headline that adds those without noting the FX-translation and securitisation effects overstates how much is new borrowing versus reclassification. ONYX keys the debt series to the primary DMO print, marks the composition, and keeps the FX-conversion basis on the record — so a year-on-year change reflects real borrowing, not a devaluation artefact.
The FAAC record improves the flow — not this ratio
FAAC has cleared ₦2tn for three consecutive months (March ₦2,036bn, April ₦2,257bn, May ₦2,300bn) — a genuine step-up in the revenue inflow. But a record FAAC month lands on the inflow side of the ledger; debt service sits on the outflow side, and it did not move. This is why ONYX’s fiscal-stress composite reads 63.5/100 (band 61.0–66.1) — elevated and stable — even through the record run. The revenue picture got better; the structural constraint did not. (The subnational side of that same FAAC story: FAAC by state and LGA.)
What would actually move it
Three levers, in order of leverage: (1) revenue mobilisation — the only durable fix, and the one the current tax-reform agenda is aimed at; (2) the cost of the debt — a first CBN rate cut would ease domestic servicing at the margin, though it trades against the portfolio inflows holding the naira; (3) the currency path — because a chunk of the stock is external, naira stability directly caps the servicing bill in local terms. Watch the debt-service-to-revenue trajectory over the next four quarters, not the debt-stock snapshot: the snapshot is the number that scares; the trajectory is the number that decides.
Every figure here shows its receipts
The debt series, the retained-revenue denominator, the FAAC inflow trend, and the fiscal-stress composite all carry their source, date, and capture method in the ONYX platform. To request the Terminal, or a reconciled Nigeria fiscal feed for research or investment-committee use: hello@onyxdata.io.