Official 2026 statutory schedule applied by the calculator above. Only income inside each band is taxed at that band’s rate.

New Zealand runs one of the world's simplest salary-tax systems. Five PAYE bands (10.5–39%), no separate social-security payroll tax on payslips (ACC earners' levy ~1.6% is the closest analogue), no payroll-tax state layer, and no capital-gains tax on most assets. The Independent Earner Tax Credit (IETC, up to $10/wk for $24–70k with no children) and Working for Families credits for parents do the redistribution instead — which is why party differences show up in thresholds and credits rather than exotic levies.

KiwiSaver and student loans: the hidden marginals

KiwiSaver defaults 3% of gross (opt-out, up to 10%) — not a tax but it leaves your fortnightly pay identically, and employer contributions (3%+) face ESCT. Student-loan repayments take 12% above $24,128 — a graduate on $70,000 loses ~$5,500 yearly on top of tax. Select both honestly; graduates' true marginal rates often exceed 40%.

National vs. Labour (and Greens, NZ First, ACT)

National-led policy lifts the 10.5–30% thresholds with inflation, restores interest deductibility and trims Working for Families abatement — steady gains for $50–150k earners. Labour favours targeted credits, free prescriptions-era supports and keeping the 39% top rate (even extending coverage) — better for low earners and families via transfers. The Greens propose wealth and higher top-rate taxes funding universal supports; ACT proposes flatter, lower bands (fewer, lower rates) favouring high earners; NZ First pushes superannuation protection and export-sector relief. A $60,000 renter gains most from threshold indexation; a $200,000 executive from ACT-style flattening.

Bracket creep in an unindexed system

Thresholds move only when governments legislate — the 2024 adjustments were the first real shift in over a decade, during which average wages rose ~40%. Every year without adjustment is a tax rise by stealth; the simulator's effective-rate display makes it visible.

Worked example and verification

$80,000, no KiwiSaver/loan: tax ≈ $16,900 → net ≈ $63,100 (≈ $2,427/fortnight). With 3% KiwiSaver + Plan loan: take-home ≈ $58,300. Verify with IRD's PAYE calculator; match within dollars confirms the engine. Simulation only.

Working for Families and IETC: where the real redistribution lives

A sole parent on $60,000 with two children can receive $15,000+/year in Family Tax Credit, In-Work Credit ($72.50/week) and Best Start ($73/week under-ones) — exceeding many tax-cut promises combined. Abatement (27% above ~$56,000) creates 50%+ effective marginal rates in the phase-out zone: extra shifts can net under half. The IETC ($10/week, $24–70k, no children) rewards child-free middle earners instead. Party scenarios move these dials hardest: Labour expands credits and Best Start duration; National trims abatement and lifts thresholds; Greens propose universal child payments; ACT targets middle-band flattening. Parents must compare transfers + tax jointly — the calculator does both when family status is set.

Property, side income and the no-CGT quirk

Wages face PAYE, but most capital gains escape tax entirely — a structural fact parties fight over: Labour/Greens propose CGT or wealth taxes (shifting lifetime burdens), National/ACT defend the status quo. Bright-line property rules (2–10 years), boarders/lodgers exemptions and schedular payments for contractors (10–35% withholding) each bend outcomes. Second jobs and gig income stack at marginal PAYE rates with no threshold doubling — $10,000 extra at 30–33% nets ~$6,700. Landlords: ring-fenced losses and restored interest deductibility (National) vs. restrictions shape after-tax yield more than bands.

Pre-vote protocol: fortnight first, philosophy second

Compute baseline fortnightly net, then each scenario's fortnight delta — small weekly numbers decide grocery reality. Add KiwiSaver and loan effects (they leave pay identically to tax), then layer Working for Families if parenting. Favour indexed thresholds over election-year lump sums: lump sums fade, indexation compounds. Vote the fortnight.

Retirement tomorrow vs. pay today: KiwiSaver compounding and NZ Super

Default 3% KiwiSaver on $70,000 is $2,100 employee + $2,100 employer yearly — $4,200 compounding from your twenties ≈ $300,000+ at 65. Bumping to 6–10% doubles or triples it; the $521 government credit is free money for $1,042 contributed. Party scenarios on employer ESCT rates, first-home withdrawal rules and default-fund settings move lifetime sums more than band tweaks. NZ Super (~$28,000 single, universal at 65, no means test) is the floor both major parties pledge to protect — its age and indexation are the real election stakes for under-40s.

Total-remuneration thinking: a $75,000 salary with 3% KiwiSaver and 3% employer match is really ~$77,250 compensation with ~$4,500 saved invisibly. Vote bands for the fortnight; vote KiwiSaver settings for the next forty years.

Key takeaways for Budget season

Watch three numbers each May: the 10.5–30% thresholds (indexed or frozen?), Working for Families abatement (does the $56,000 threshold move with wages?), and the IETC band ($24–70k intact?). If thresholds freeze while wages rise 4%, a $70,000 earner's effective rate climbs ~0.4 points — roughly $25/fortnight lost silently. Rank party promises against that creep: a $15/fortnight lump sum against $25/fortnight drag is a pay cut with better marketing. Re-run this simulator on Budget night with the new tables and screenshot your fortnight before arguing about tax policy. Fresh numbers beat stale slogans every time.