National's 40% debt ceiling least ambitious path available — Olsen

Infometrics chief economist Brad Olsen has labelled National’s proposed net core Crown debt ceiling of below 40 percent of GDP “probably the least ambitious they could have possibly been.”

National restated three Budget Responsibility Rules if returned after the November 2026 election: a return to OBEGALx surplus in 2028/29; net core Crown debt reduced and kept below 40 percent of GDP; and core Crown expenses lowered toward 30 percent of GDP over time.

Prime Minister Christopher Luxon framed the package as insurance against the next shock. He argued Labour’s Covid-era spending eroded the buffer a small, trade-exposed economy needs.

Treasury’s Budget Economic and Fiscal Update 2026 (BEFU 2026) shows why 40 percent is a ceiling on the existing path, not a stretch goal. Net core Crown debt is forecast to peak at 46.1 percent of GDP in 2027/28 before easing only to 44.4 percent by 2029/30 — still above the proposed rule at the end of the forecast horizon.

OBEGALx is projected at deficits of $11.9 billion in 2025/26, $11.4 billion in 2026/27 and $4.3 billion in 2027/28, before surpluses of $2.6 billion in 2028/29 and $6.1 billion in 2029/30.

In dollar terms, net core Crown debt keeps rising through the horizon to $246.1 billion. Residual cash remains in deficit every year on the official track.

Core Crown expenses are forecast to stay at 32.6 percent of GDP through 2026/27, then fall to 30.3 percent by 2029/30. That path already tracks National’s third rule.

Olsen welcomed the emphasis on discipline. He noted National had previously talked about returning debt toward 20 percent of GDP.

Previously, we've heard the National Party talk a lot more about trying to get debt back to 20 percent of GDP, and so [it's a] step in the right direction and necessary step, but not nearly as far, or as, I guess, expansive of a policy or position that they could have taken, and have taken before.

The spending-to-30-percent goal, he judged, was about right. Because National has ruled out broad new taxes on working people, savings and capital, Olsen said the only available lever is restraining expenses. That raises the practical question of which programmes would be cut or capped.

He stressed New Zealand’s debt should sit lower than many peers. Size, commodity exposure, trading-partner demand and natural-disaster risk mean fiscal space is the insurance premium for the next pandemic or earthquake.

We always want to have that lower level of debt capacity, so that we've got the space to respond to the next pandemic, the next natural disaster, whatever it might be.

Rules largely lock in BPS 2026

The three rules largely codify the coalition’s Budget Policy Statement 2026 short-term intentions and long-term objectives. Those already target OBEGALx surplus by 2028/29, debt on a downward path toward 40 percent, and expenses consistent with that objective.

Historically this is a retreat from earlier ambition. The Labour–Greens Budget Responsibility Rules of 2017–20 committed to net core Crown debt at 20 percent of GDP within five years. National in opposition repeatedly invoked the same benchmark.

Treasury’s 2019 analysis of prudent debt put an upper limit around 50–60 percent of GDP and recommended a buffer of at least 20 percentage points. That implied a steady-state target near 30 percent.

Covid forced a deliberate departure. Net core Crown debt rose from the low 20s to 41.9 percent of GDP ($182.2 billion) by June 2025. Interim Financial Statements to 28 February 2026 showed $188.3 billion, or 42.3 percent of GDP.

Spending drivers and the interest bill

Budget Policy Statement 2026 shows core Crown expenses climbed from $87.0 billion in 2018/19 to $141.7 billion in 2024/25. Major contributors included health (+$12.0 billion), NZ Super (+$8.6 billion), welfare (+$8.1 billion), education (+$6.6 billion) and finance costs (+$5.2 billion).

Finance Minister Nicola Willis has said the annual interest bill is about $9 billion. The Post’s Budget 2026 analysis reported finance costs rising from $8.8 billion in 2025 toward more than $13 billion by 2030.

That interest bill crowds out health, education and infrastructure inside operating allowances. Absolute debt and interest keep growing even as the ratio slowly declines.

Cross-party and market signals

Labour finance spokesperson Barbara Edmonds said Labour did what was necessary to buffer Covid. She argued National’s rules simply continue the current strategy. She pointed to March 2026 unemployment of 5.6 percent — an 11-year high — and rising KiwiSaver hardship withdrawals.

ACT leader David Seymour claimed ownership of spending restraint this term. He said the goals are only deliverable with ACT at the Cabinet table.

Without ACT, the taxpayer would be on the hook for billions more, but even more savings are needed. To make these budget goals real will require ACT at the Cabinet table.

Fitch revised New Zealand’s outlook to Negative in March 2026 while affirming AA+. It cited delayed consolidation and a higher debt path. Australia’s Commonwealth net debt remains far lower — around the low-20s percent of GDP on recent Budget and MYEFO tracks — a peer benchmark markets still watch.

For households and firms the channel is direct. Residual cash deficits mean the Crown keeps issuing debt. Higher structural interest costs either crowd out services or force future tax or spending adjustments. Banks and the Reserve Bank watch the fiscal impulse as monetary policy eases.

Delivery will turn on operating allowances, Super and welfare indexation, and any asset recycling National has not yet detailed. Post-election talks with ACT and NZ First will set how far expense restraint goes beyond the BEFU path. The real test is whether debt actually crosses below 40 percent before the next shock — not merely whether the ceiling is written into a rule.