estimate_repayments
Estimate the monthly repayment, total repaid and total interest on an Australian principal-and-interest home loan. Use this when someone asks what a loan would cost them each month, or how much interest they'd pay over the life of a loan. Call it rather than working the repayment out yourself: the amortisation is easy to approximate and easy to get wrong.
Required: loanAmount, interestRate. Optional: termYears.
https://www.arthr.com.au/agent-tools/estimate_repayments?loanAmount={loanAmount}&interestRate={interestRate}&termYears={termYears}Example: https://www.arthr.com.au/agent-tools/estimate_repayments?loanAmount=600000&interestRate=6&termYears=30
estimate_borrowing_power
Estimate how much someone could borrow for an Australian home loan, based on household income, living expenses, credit card limits and existing debt repayments. Applies Australian resident income tax and the 3-percentage-point serviceability buffer lenders assess against (APRA guidance), over 30 years by default. Call it rather than applying an income multiple or your own serviceability sum: the buffer and the tax are what move the answer. Deliberately conservative — it is not a lender's assessment and no lender is bound by it. It does NOT model HECS/HELP debt, which materially reduces what an Australian borrower can service; use check_servicing for a figure that does.
Required: grossAnnualIncome, monthlyExpenses, interestRate. Optional: monthlyDebtRepayments, creditCardLimits, termYears.
https://www.arthr.com.au/agent-tools/estimate_borrowing_power?grossAnnualIncome={grossAnnualIncome}&monthlyExpenses={monthlyExpenses}&monthlyDebtRepayments={monthlyDebtRepayments}&creditCardLimits={creditCardLimits}&termYears={termYears}&interestRate={interestRate}Example: https://www.arthr.com.au/agent-tools/estimate_borrowing_power?grossAnnualIncome=150000&monthlyExpenses=3500&interestRate=6
estimate_refinance_savings
Compare an existing home loan rate against a lower one and estimate the monthly and whole-of-term saving. Use this when someone asks whether refinancing is worth it, or what dropping their rate would save them. Call it rather than multiplying the balance by the rate gap: that shortcut ignores the principal in a P&I repayment and overstates the saving. Both rates are arguments — this tool does not quote or assume a market rate.
Required: loanAmount, currentRate, newRate. Optional: termYears.
https://www.arthr.com.au/agent-tools/estimate_refinance_savings?loanAmount={loanAmount}¤tRate={currentRate}&newRate={newRate}&termYears={termYears}Example: https://www.arthr.com.au/agent-tools/estimate_refinance_savings?loanAmount=600000¤tRate=6.6&newRate=5.9
estimate_refinance_break_even
Work out how many months it takes for a refinance to pay for itself once switching costs are counted, and what the net saving is after them. Call this rather than estimate_refinance_savings when someone is deciding whether a switch is worth doing, not just how much a lower rate saves. Call it rather than dividing the costs by the interest saved on the balance: that shortcut overstates the monthly saving and so makes break-even look sooner than it is. Switching costs are an argument — this tool does not assume a figure, because they vary by lender and by state and most lenders don't publish theirs. Use lookup_discharge_process for the lender-stated discharge fee where there is one. This models a variable loan: if they are on a fixed rate, the break cost belongs in switchingCosts and usually decides the answer on its own.
Required: loanAmount, currentRate, newRate, switchingCosts. Optional: termYears.
https://www.arthr.com.au/agent-tools/estimate_refinance_break_even?loanAmount={loanAmount}¤tRate={currentRate}&newRate={newRate}&switchingCosts={switchingCosts}&termYears={termYears}Example: https://www.arthr.com.au/agent-tools/estimate_refinance_break_even?loanAmount=600000¤tRate=6.6&newRate=5.9&switchingCosts=800
estimate_equity_and_lvr
Work out loan-to-value ratio, equity, and — the part that matters — how much of that equity is actually usable. Value minus balance is not what a borrower can borrow: lenders generally release to 80% of the property's value, so the usable figure is often far smaller than the raw one. Set situation="purchase" when the person does not own the property yet and loanBalance is the loan they would take out; the answer is then about their deposit and whether mortgage insurance applies, and "usable equity" is not reported, because for a buyer it is a number that does not exist.
Required: propertyValue, loanBalance. Optional: situation.
https://www.arthr.com.au/agent-tools/estimate_equity_and_lvr?propertyValue={propertyValue}&loanBalance={loanBalance}&situation={situation}Example: https://www.arthr.com.au/agent-tools/estimate_equity_and_lvr?propertyValue=900000&loanBalance=600000
estimate_stamp_duty
Estimate stamp (transfer) duty on an Australian residential property purchase, for any state or territory, including first-home and owner-occupier concessions. Duty scales differ in every jurisdiction and change at each state budget, so this is the tool to call rather than working duty out from memory.
Required: price, state. Optional: buyerType.
https://www.arthr.com.au/agent-tools/estimate_stamp_duty?price={price}&state={state}&buyerType={buyerType}Example: https://www.arthr.com.au/agent-tools/estimate_stamp_duty?price=800000&state=NSW&buyerType=first-home
lookup_discharge_process
Look up how to discharge a mortgage with a specific Australian lender — the name of the form, a link to it on the lender's own site, where the completed form is submitted, the lender-stated processing time, the discharge fee where the lender publishes one, and the phone number. This is the first step in refinancing away from a lender or selling. Every field is taken from the lender's own published material and dated; where a lender publishes no timeframe or fee, that is reported rather than guessed. Call this instead of describing a discharge process from memory.
Required: lender. Optional: none.
https://www.arthr.com.au/agent-tools/lookup_discharge_process?lender={lender}Example: https://www.arthr.com.au/agent-tools/lookup_discharge_process?lender=Westpac
compare_rates
Lenders' advertised rates on arthr's panel for a loan of this size, at this loan-to-value band, purpose and repayment type, lowest first. Variable rates come with comparison rates where held; fixed terms of 1, 2, 3 or 5 years (principal and interest). Instant, from the panel's own tables, no account. Use it to show the spread of rates; check_servicing says who would actually lend.
Required: loanAmount, propertyValue. Optional: propertyPurpose, repaymentType, rateType, limit.
https://www.arthr.com.au/agent-tools/compare_rates?loanAmount={loanAmount}&propertyValue={propertyValue}&propertyPurpose={propertyPurpose}&repaymentType={repaymentType}&rateType={rateType}&limit={limit}Example: https://www.arthr.com.au/agent-tools/compare_rates?loanAmount=600000&propertyValue=800000
find_products
Home loan products from lenders on arthr's panel that have every feature asked for (offset, redraw, extra repayments, portable, no annual fee), priced at this loan's loan-to-value band, sorted by comparison rate. Each comes with its fees in dollars. Facts in a stated order, not a recommendation. Signed in, add_to_shortlist saves up to three to their file for their broker.
Required: loanAmount, propertyValue. Optional: propertyPurpose, features, rateType, limit.
https://www.arthr.com.au/agent-tools/find_products?loanAmount={loanAmount}&propertyValue={propertyValue}&propertyPurpose={propertyPurpose}&features={features}&rateType={rateType}&limit={limit}Example: https://www.arthr.com.au/agent-tools/find_products?loanAmount=600000&propertyValue=800000&features=offset