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 were planning to apply for a temporary rate reduction to hold yourself at 3% when the default supposedly moved to 4%, you don’t need to. The reduction mechanism still exists in IRD’s toolkit, but the trigger for needing it — a 4% default — has been pushed two years out.

What changed in Budget 2026

KiwiSaver setting	Pre-Budget-2026 expectation	Budget 2026 confirmed
Default employee rate (1 April 2026)	4%	3.5%
Employer minimum match (1 April 2026)	4%	3.5%
Default employee rate (1 April 2028)	(unspecified)	4.0%
Employer minimum match (1 April 2028)	(unspecified)	4.0%
Government member contribution	$260.72/year	$260.72/year (unchanged)
16-17 year-old employer compulsory contributions	Not required	NEW — required from 1 April 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

Existing 3% contributors don’t auto-move on 1 April 2026. Only the default for new auto-enrolments shifts to 3.5%. If you were already on 3% (or 4%, 6%, 8%, 10%) before 1 April 2026, you stay on your elected rate unless you actively change it. Your employer’s contribution rises to the new 3.5% minimum regardless of what you contribute personally.

This was true under the pre-Budget plan and remains true under the deferred plan. The 3.5% Stage 1 step only really matters for two groups:

1. New employees auto-enrolled on or after 1 April 2026 — their default deduction is 3.5%, not the old 3%.
2. 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%.
• But the headline reason for using it is gone. You’re 3% against a 3.5% default — only a 0.5-percentage-point gap, not the 1.0-point gap the pre-Budget plan implied. The cash-flow benefit is roughly half what it would have been.

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:

Rate	Employee contribution / year	Difference vs 3.5% default
3% (with temporary reduction)	$2,100	−$350
3.5% (default from 1 April 2026)	$2,450	—
4% (voluntary now, or default from 2028)	$2,800	+$350
6% (voluntary)	$4,200	+$1,750
8% (voluntary)	$5,600	+$3,150

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 an existing member on 3%, 4%, 6%, 8%, or 10%. Your elected rate continues.
• 1 April 2026: 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%. Most existing members do nothing. New enrolees default to 3.5%. The temporary rate reduction mechanism still exists for those who want it, but the case for using it 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.