New Zealand loan repayment, GST and budget calculators
Plan with your local currency. Check each tool’s supported circumstances before using an estimate.
Loan repayment calculator
Compare fixed-rate monthly payments in NZD. General planning only; excludes lender fees and KiwiSaver rules.
Open Loan repayment calculatorWhat these calculators cover
For one domestic standard-rated supply at 15%. Enter the price before tax or the tax-inclusive total. Not an invoice or a tax return.
Model / rate version: 2026-10-16. Published rate parameters checked on 2026-10-16; read the model’s exclusions.
Read full methodology and assumptions →Planning in NZD: where to start
Use the GST calculator only after confirming standard-rated treatment for the transaction. It can add GST to a net price or extract it from a GST-inclusive price; it does not decide taxability.
Compare the same costs and time period
For an NZD loan plan, compare monthly payments with your own budget and include fees separately. The general savings illustration does not calculate KiwiSaver rules, tax or variable investment returns.
Fixed-rate loan payment in NZD
Enter your own amount and nominal annual rate. This general formula assumes equal monthly payments and excludes fees, insurance, taxes, variable rates and product-specific contract rules.
Worked example: $20,000.00 at an assumed 6% nominal annual rate over 36 months gives $608.44 per month. This rate is an example, not a New Zealand market rate or offer.
Formula: payment = P × r / (1 − (1+r)−n), where r is the annual percentage divided by 1200 and n is months. At zero interest, payment = P/n. Use the full loan calculator.
Available calculators
Recommendations reflect available coverage, not measured popularity.
Loan repayment calculator ↗
Illustrative planning formula; excludes local taxes, fees and product-specific terms.
Open calculator →Budgeting & debtMonthly budget ↗
Illustrative planning formula; excludes local taxes, fees and product-specific terms.
Open calculator →Business & VAT/GSTNew Zealand GST calculator ↗
For one domestic standard-rated supply at 15%. Enter the price before tax or the tax-inclusive total. Not an invoice or a tax return.
Open calculator →Savings & investmentsCompound interest ↗
Illustrative planning formula; excludes local taxes, fees and product-specific terms.
Open calculator →Savings & investmentsSavings goal ↗
Illustrative planning formula; excludes local taxes, fees and product-specific terms.
Open calculator →Guides for New Zealand
Practical reading with NZD examples and relevant official sources. Financial guide content is in English.
Planned local coverage
These tools are coming soon and are not available as calculations:
- net salary
- KiwiSaver
Each needs its own official sources, supported circumstances and test cases before publication.
Before you compare results
Keep the currency and time period consistent. A monthly income estimate is an annual average unless the calculator explicitly models individual pay periods. The general loan and savings tools do not apply New Zealand tax law, fees, benefit rules or investment guarantees.
Changing the display currency does not convert exchange rates or change the legal jurisdiction of a calculator. Use the dedicated local tool for the scope described above.
General planning reading
These guides explain planning concepts using US examples; they are not New Zealand tax guidance.
How compound interest works · Building an emergency fundSources and maintenance
Source links and existing model years are retained from the current calculators. Check official guidance for your circumstances and report issues through our contact page. New local payroll, pension, property and benefit tools require source review and tests before publication.
What these New Zealand tools cover
Country-specific tools are listed with their supported circumstances and source-review limits on each calculator. General planning tools use NZD display where selected; a currency change does not apply local tax, lending or product rules.
Coverage and links checked October 21, 2026. Tax-rule review dates remain specific to each model; this coverage check does not certify every local rule.