KiwiSaver Default Stayed at 3.5% on 1 April 2026 — Stage 2 to 4% Deferred to 2028

Budget 2026 confirmed on 28 May that the KiwiSaver default contribution rate for new auto-enrolments stays at 3.5% from 1 April 2026 — not 4% as earlier 2025 legislation had pencilled in. The further step from 3.5% to 4% is now deferred to 1 April 2028, giving households a two-year reprieve from the next 0.5-percentage-point lift.

If you want to carry on contributing at 3%, you still have to apply for a temporary rate reduction. The step from the 3% default to 3.5% is automatic — IRD moves you unless you opt out. What the deferral changed is the size of the gap you’re opting out of: half a percentage point, not the full point a single-stage move to 4% would have meant.

What changed in Budget 2026

The two-stage timetable is now: Stage 1 (3% → 3.5%) effective 1 April 2026, Stage 2 (3.5% → 4%) effective 1 April 2028. Schools also receive Crown funding to cover their increased employer contributions.

What this means for existing members

If you were contributing at the 3% default, you were moved to 3.5% automatically on 1 April 2026 — your contribution and your employer’s. IRD’s wording leaves no room: “If you’re contributing at the default rate of 3%, this will automatically rise to 3.5% for both your contribution and your employer’s. Your employer will deduct 3.5% from 1 April (unless you apply for a temporary rate reduction). You do not need to do anything.” The new rate applies to every pay day from 1 April, even when the pay period straddles the date.

If you had already elected a higher rate — 4%, 6%, 8% or 10% — your own contribution doesn’t change. Your employer’s rises to the 3.5% minimum if it was sitting at 3%.

The split is therefore default rate vs elected rate, not new member vs existing member. Stage 1 matters to three groups:

1. Existing members on the 3% default — deductions rose to 3.5% on 1 April 2026 unless they applied for a temporary rate reduction.
2. New employees auto-enrolled on or after 1 April 2026 — their default deduction is 3.5%, not the old 3%.
3. Employers — must lift their match to at least 3.5% from 1 April 2026, and again to at least 4% from 1 April 2028.

What if you’ve already applied for a temporary rate reduction?

If you applied for a temporary reduction expecting to dodge a 4% default in April 2026, two things to know:

• The reduction is still valid. IRD didn’t retroactively cancel the carve-out. You’re held at 3%, and you still needed it — without it the 3% default would have stepped you up on 1 April.
• But the cash-flow benefit is half what you expected. You’re at 3% against a 3.5% default — a 0.5-percentage-point gap, not the 1.0-point gap the pre-Budget plan implied.
• It lapses. A reduction runs 3–12 months and then resets you to the default rate. You can re-apply as many times as you like, but nothing renews itself.

On a $70,000 salary the 3% vs 3.5% gap is $350/year ($6.73/week); against the deferred 4% default it would have been $700/year ($13.46/week).

Renew the reduction if you still need it. Let it lapse and revert to 3% (now matching the lower end of the new default range) if cash flow has stabilised.

What if you want to lock in 4% voluntarily today?

You don’t need to wait for the 2028 step — you can elect 4% (or 6%, 8%, 10%) right now. Use the KS2 form with your employer or the rate-change function in myIR. Higher voluntary rates capture more compound growth and, if your employer offers tiered matching above the statutory floor, may unlock a higher employer contribution too.

Quick maths on $70,000 gross at 4% vs the new 3.5% default:

Each step up is taxable as Employer Superannuation Contribution Tax (ESCT) on the employer portion only — your personal contribution comes out of after-tax pay.

Who benefits most from the 2-year Stage 2 deferral

Households on tight cash flow get two extra years before the next mandatory uplift. The 2028 step is now scheduled but not yet legislated, so a future Government could move or revoke it.

For employers, especially small businesses, the deferral spaces out the labour-cost increase: 0.5 percentage points in 2026, then another 0.5 in 2028, instead of a 1.0-point hit in 2026 alone.

For the Crown, the deferral matters less — total fiscal cost of KiwiSaver subsidies (MTC + tax credits) is dominated by the halving of MTC that Budget 2025 enacted, not the rate-step timing.

What stayed the same in Budget 2026

• Government member contribution at $260.72/year (halved from $521.43 in Budget 2025; no restoration).
• $1,042.86 personal contribution threshold to claim the full $260.72.
• First-home withdrawal rules unchanged.
• Retirement age for KiwiSaver access at 65.
• Hardship withdrawal grounds unchanged.

Practical timeline

• Now: nothing to do if you’re on 3.5%, 4%, 6%, 8%, or 10% — your rate continues. If you want to be at 3%, apply to IRD for a temporary rate reduction; it is never automatic, and it expires after at most 12 months.
• 1 April 2026: members on the 3% default moved to 3.5% automatically (both sides); new auto-enrolees deducted at 3.5%; employer match rises to 3.5%; 16-17 year-olds become eligible for compulsory employer contributions.
• 1 April 2028 (next scheduled): default and employer minimum both move to 4%. Existing 3% / 3.5% contributors auto-move unless they apply for a temporary rate reduction at that point.

Tools to model the impact

• KiwiSaver Calculator — full breakdown at any rate
• KiwiSaver 3% vs 4% Calculator — direct rate comparison
• Take-Home Pay Calculator — net pay at each KS rate
• KiwiSaver Government Contribution Calculator — whether you hit the $1,042.86 trigger at your contribution rate

Bottom line

The 1 April 2026 step is real but smaller than headlines suggested — 3% → 3.5%, not 3% → 4%. If you were on the 3% default you were moved across automatically and didn’t have to do anything; if you’d chosen a higher rate, your own contribution was untouched. Staying at 3% is the one option that requires action: apply for a temporary rate reduction. The case for doing so is weaker now that the gap to default is 0.5 percentage points instead of 1.0. Save the calendar reminder for 1 April 2028, when Stage 2 actually lands.

For the full Budget 2026 personal-finance picture see the NZ Budget 2026 summary and the Budget 2026 hub.