NZ mortgage refix calculator: estimate your new payment at current rates and what percentage of take-home income it will consume.
Formula
function pmt(balance, rate, years){ const r=rate/100/12; const n=years*12; return r===0 ? balance/n : balance*r*Math.pow(1+r,n)/(Math.pow(1+r,n)-1); } const current_payment=pmt(inputs.loan_balance,inputs.current_rate,inputs.remaining_years); const new_payment=pmt(inputs.loan_balance,inputs.new_rate,inputs.remaining_years); const income_impact=inputs.monthly_income>0 ? new_payment/inputs.monthly_income*100 : 0; return { current_payment: Math.round(current_payment), new_payment: Math.round(new_payment), income_impact: Math.round(income_impact) };Loan Balance
750,000
Current Interest Rate (%)
4.99
New Interest Rate (%)
6.89
Remaining Term (Years)
25
Monthly Take-Home Income
9,000
Use the result to compare providers, request quotes, or send the scenario to a specialist when the numbers matter.
This NZ mortgage refix shock calculator estimates current payment, new monthly payment, and the new payment as a share of take-home income from loan balance, current rate, new rate, remaining term, and income. Use it as an information-only planning tool before speaking with a bank, broker, or qualified adviser.
Use this finance calculator to compare scenarios before committing money, time, or a provider conversation.
The estimate combines Loan Balance, Current Interest Rate (%), New Interest Rate (%) and returns Current Monthly Payment, New Monthly Payment, New Payment as Income.
If the result changes your decision, verify the current quote, rate, eligibility rule, or provider term before acting.
Founding provider slot
We are opening one clearly labelled sponsor slot per high-intent calculator/category. The test offer is $49 USD for a 30-day tracked placement, with opt-in leads only and no anonymous views sold as leads.
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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.