Estimate how many months to save your first home deposit in NZ. Includes KiwiSaver, cash savings, monthly surplus, and return on savings.
Formula
const current_deposit = inputs.cash_saved + inputs.kiwisaver_available; const monthlyRate = inputs.annual_return/100/12; let balance = current_deposit; let months = 0; while (balance < inputs.target_deposit && months < 600) { balance = balance*(1+monthlyRate) + inputs.monthly_surplus; months++; } const remaining_gap = Math.max(0, inputs.target_deposit-current_deposit); return { current_deposit: Math.round(current_deposit), months_to_target: months, remaining_gap: Math.round(remaining_gap) };Target Deposit
180,000
Cash Saved
60,000
KiwiSaver Available
45,000
Monthly Savings Surplus
5,000
Annual Return on Savings (%)
3
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First Home Deposit Timeline Calculator NZ estimates Current Deposit Available, Months to Target, Remaining Gap from Target Deposit, Cash Saved, KiwiSaver Available, Monthly Savings Surplus, Annual Return on Savings (%). It is built for mortgage shock, debt cost, deposit timelines, and household affordability decisions; use the output as a decision checkpoint, then confirm current pricing, rules, quotes, or professional advice before committing money.
Use this finance calculator to compare scenarios before committing money, time, or a provider conversation.
The estimate combines Target Deposit, Cash Saved, KiwiSaver Available and returns Current Deposit Available, Months to Target, Remaining Gap.
If the result changes your decision, verify the current quote, rate, eligibility rule, or provider term before acting.
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This calculator provides estimates based on the inputs provided. It does not constitute financial advice, investment recommendations, or tax guidance. Past performance does not guarantee future results. Consult a qualified financial advisor, accountant, or tax professional before making financial decisions.
Reviewed by the CalculateThis.ai editorial team. Updates: check back for latest parameters. Tools are for estimation only — verify with current provider terms.