Tools for the numbers behind a property deal — repayment schedules, total interest, and the fees that land before you get the keys.
What breaks a property budget is rarely the headline price. It is everything stacked on top of it: the agent's commission, acquisition or transfer tax and its surtaxes, conveyancing and registration costs, and — if there is a mortgage — the monthly repayment. This group covers the parts you can know in advance by calculating them.
The usual order is: check the repayment first to see what is affordable monthly, then the acquisition tax to see how much cash the contract date needs, then the commission to see what leaves on completion.
Agent commission is regulated as a maximum rate per transaction band, negotiated between the client and the agency within that ceiling. The number the calculator returns is therefore the most that may be charged, not an amount that settles automatically.
Sale and lease use different rate tables, and the table changes again depending on whether the property is residential, a studio-office unit, or another building type. Leases convert deposit and monthly rent into a single transaction value to pick the band, and that conversion rule means a small change in rent can push you into a different bracket.
Some details are set by regional ordinance, so it is worth confirming the local table before signing.
Residential acquisition tax is not decided by price alone. The number of homes you already own, whether the area is designated, how the property was acquired (purchase, inheritance, gift) and the floor area all change the rate. Two identical prices can produce tax bills that differ several times over depending on whether it is a first home or a third.
A local education surtax rides on top of the main tax, and a rural development surtax is added above a floor-area threshold. That is why the calculator totals the surtaxes too — budgeting from the headline tax alone leaves you short.
Relief schemes such as first-time buyer reductions have tight, frequently revised conditions, so the calculator works from the standard rates. Whether you qualify is decided by the local tax office.
An equal-payment mortgage keeps the monthly figure flat and is easy to budget, but most of an early payment is interest. An equal-principal schedule is heavier at the start and cheaper in total. A grace period pays interest only, leaving the principal untouched, so the payment jumps once the grace period ends.
With the same rate and the same amount, that choice alone can move the total interest substantially. Change only the schedule in the calculator and compare the totals.
On a variable rate, today's figure is a starting point. Re-run it with the rate one or two points higher and check that it still works.
First, set the purchase range from the borrowing limit and the monthly repayment. Second, add acquisition tax and commission at that price to work out the cash needed on the contract and completion dates. Third, add the items people forget — maintenance reserve settlement, service charge apportionment, moving and fit-out — and leave a margin.
Finishing those three before signing removes most of the completion-day surprises.
They do not value a property and do not recommend a listing or an area. They cannot see special clauses, assumed obligations, sitting tenants or existing charges on the title. Eligibility for tax relief and the outcome of a credit assessment are decided by the tax office and the lender respectively.
Use the results as a baseline for negotiation and budgeting. The binding figures come from the agent, the conveyancer and the tax authority.