nz_kiwisaver_calculator

nz.co.calculate/calculator · Verify this server

Project a NZ KiwiSaver balance from current age to retirement age. Month-by-month compound interest projection matching the calculate.co.nz methodology. Includes employee and employer contributions, voluntary top-ups at your chosen cadence, the government contribution ($260.72/yr if eligible), management fees, and PIR tax on investment gains. Returns both the nominal final balance and the inflation-adjusted real (today's dollars) balance. Use for ANY KiwiSaver retirement-planning question: 'how much will I have at 65', 'is $X enough to retire on', 'what happens if I contribute more', 'how much does switching from Conservative to Growth help', 'what's the impact of fees over 30 years'. FUND TYPES and expected annual returns: - Cash: 1.00% (very low risk, low return) - Conservative: 2.50% (low risk, default) - Balanced: 4.00% (moderate risk) - Growth: 7.00% (higher risk, higher expected return) - Custom: you specify via custom_return_pct PIR (Prescribed Investor Rate) is the tax rate on your KiwiSaver investment gains, NOT your income tax rate. Valid values: - 10.5 (low incomes) - 17.5 (middle incomes) - 28 (higher incomes, default) KEY RULES APPLIED (current as of April 2026): - Government contribution: full $260.72/yr for eligible members (halved from $521.43 on 1 July 2025) - Not available if annual income exceeds $179,999.99 - Minimum contribution 3.5% from 1 April 2026 (rising to 4% in 2028) Args: current_balance: Starting KiwiSaver balance in NZD. current_age: Current age in whole years. retirement_age: Projection end age (default 65). annual_income: Current gross annual salary (default 100000). income_growth_pct: Annual salary increase % (default 1.0). employee_rate_pct: 0, 3, 3.5, 4, 6, 8, or 10 (default 3.5). employer_rate_pct: Employer contribution % (default 3.5, NZ minimum). voluntary_amount: Extra contribution per period in NZD (default 0). voluntary_frequency: 'week', 'fortnight', 'month', 'year' (default 'month'). fund_type: Cash, Conservative (default), Balanced, Growth, or Custom. custom_return_pct: Required if fund_type='Custom'. pir_rate_pct: PIR as percentage: 10.5, 17.5, or 28 (default 28). annual_fee_pct: Management fee % annually (default 0.40). inflation_pct: For real-value reporting (default 3.0). switch_fund_at_age: Optional age to switch fund (e.g. derisk at 55). switch_to_fund: Fund to switch to at that age. switch_custom_return_pct: Required if switching to Custom fund.