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Tools

Australian mortgage calculators — repayments, refinance, extras & duty planning.

Model principal & interest repayments, compare refinance scenarios with simple break-even timing, stress-test extra repayments, and link out to official state transfer duty calculators. Run the numbers before you speak with Bishnu Adhikari — outputs are mathematical illustrations only; they are not credit advice and do not replace a lender's assessment, fees, or product features such as offsets.

Repayment calculator

Estimate principal & interest (P&I) repayments for a standard monthly amortising loan at a constant nominal rate. Interest-only schedules, offset and redraw behaviour, and lender fees are not modelled — treat the figure as a baseline, then confirm against your loan contract or broker advice.

The amount you intend to borrow after deposit.

Nominal annual rate divided by twelve each month — not comparison rate.

Estimated repayment

$3,636 /month

Total repayments
$1,308,949
Total interest (estimate)
$708,949

This shows a steady payment line — your lender's actual repayment may differ slightly due to daily interest rounding and product features.

How your loan changes over time

The charts below update as you change the numbers above. Move your pointer over the curves to see estimated balance by month, and how principal paid and interest paid build up over the life of the loan.

Loan balance over time

Move your pointer along the line to see the estimated balance at each month.

Loan balance over time$600k$300k0Start15 yrs30 yrs

Tap or drag on the chart to see figures for a particular point in time.

Cumulative principal vs interest paid

Lower band: principal repaid. Upper band: interest paid. Total height is cumulative cash out.

$1.3m$654k0

Move across the chart to compare how much principal and interest you’ve paid at any point.

First repayment split

Early repayments skew to interest; principal share grows over time.

Interest $3,050 Principal $586

General information only. These calculators provide estimates based on the numbers you enter. They do not constitute credit advice, take your full situation into account, or replace a lender's assessment. Fees, eligibility, and actual offers vary. Speak with a broker for guidance tailored to you.

Refinance savings

Compare monthly P&I repayments when balance and remaining amortising term are unchanged — then see a simple break-even on switching costs. It does not model interest-only rollovers, term extensions that lower monthly payments but increase total interest, fixed-rate break costs, cashback vesting periods, or offset balances moving with you.

Discharge, application, valuation, and legal — ballpark only.

Repayment comparison

Current (approx.)
$3,765/mo
After refinance (approx.)
$3,511/mo
Monthly difference
$254/mo
Approx. annual saving
$3,048/yr

Rough break-even on switching costs: 14 months of saved repayments (excluding offset behaviour and fee timing).

Comparison

Hover a bar for emphasis — values are shown on the right.

Current repayment (per month)$3,765
New repayment (per month)$3,511

Cumulative savings (60 months)

If the monthly difference stayed steady, saved cash flow stacks roughly along this slope — before tax, offset use, or price changes.

0 mo30 mo60 mo

$15k cumulative over 60 months (illustrative)

General information only. These calculators provide estimates based on the numbers you enter. They do not constitute credit advice, take your full situation into account, or replace a lender's assessment. Fees, eligibility, and actual offers vary. Speak with a broker for guidance tailored to you.

Extra repayment impact

See how adding a consistent monthly amount above your scheduled P&I repayment can shorten the loan and reduce modelled total interest — holding the headline rate and mandatory instalment constant. Many fixed-rate products cap voluntary extra repayments; variable loans may pair better with offset redraw logic that this tool does not simulate.

Illustrative outcome

Approx. loan life
23 yrs (270 mo)
Interest without extra repayment
$602,359
Interest with extra repayment
$427,716

$174,643 less interest in this simplified model, and roughly 90 fewer months of payments — before real-world product rules and redraw/offset behaviour.

Comparison

Hover a bar for emphasis — values are shown on the right.

Months on standard schedule360 mo
Approx. months with extra270 mo

Total interest picture

Taller bar = more interest paid in this simplified model (same vertical scale).

Without extra repayment

$602,359

With extra repayment

$427,716

Interest saved vs baseline: $174,643

General information only. These calculators provide estimates based on the numbers you enter. They do not constitute credit advice, take your full situation into account, or replace a lender's assessment. Fees, eligibility, and actual offers vary. Speak with a broker for guidance tailored to you.

Purchase costs & stamp duty

We link to each state and territory's official transfer duty (stamp duty) tools because rules, concessions, surcharges and dutiable value treatments differ — a single generic estimate cannot stay accurate across jurisdictions or budget changes.

Choose where you are buying and use that jurisdiction's calculator for a duty figure. Then layer legal fees, registration, inspections and your post-settlement buffer with your conveyancer and broker.

Calculators are maintained by the relevant revenue office or official provider — not by this website.

Official calculators by state / territory

Once you know where you are buying, use the matching calculator below for duty figures. We can then help you layer in the rest of your purchase costs and borrowing structure.

Need a clearer picture of total funds to complete — not just duty? We can walk through deposit, fees, and lender options for your state once you're ready.

Buyer-cost planning buffer

Not stamp duty alone — a single dial for "how much extra should I mentally reserve beyond the deposit" while you confirm precise numbers.

$39,375

Buffer intensity

2%10%

Selected 4.5% of purchase price

Bar fills from 2% (nominal minimum dial) to 10% (upper dial) — for orientation only.

Illustrative pooled allowance — confirm duty, legal, registration, inspections, and moving with your conveyancer and broker.

General information only. These calculators provide estimates based on the numbers you enter. They do not constitute credit advice, take your full situation into account, or replace a lender's assessment. Fees, eligibility, and actual offers vary. Speak with a broker for guidance tailored to you.

Calculator FAQs

How to interpret results, what is included, and when to involve a broker — short answers that match the estimating nature of these tools.

Numbers are the start — not the finish.

When you are ready for lender strategy, document sequencing, and product fit, send a short enquiry — we can talk through assumptions and next steps.

Prefer a human sense-check on your results?

Share your scenario — we will sanity-check assumptions and suggest next steps.

Prefer the phone? 0400 77 77 55 — direct line to Bishnu Adhikari.

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