Buyer tools

Use the same deal in every calculation

Use the same property and offer throughout: project, unit, currency, total price, contract version and payment schedule. Recalculate if the seller changes the price, property or package. Otherwise, the price of one unit, the instalments of another and the rent of a third can become a deal that does not exist.

An unknown value is not zero

Where a fee, tax, service charge, vacancy period, bank charge or refund condition is unconfirmed, leave it unknown. Zero is a positive statement that the cost or risk does not exist; missing evidence does not support that conclusion.

Display the result together with every unknown item and test whether it could change the decision. If an unknown prevents the buyer from establishing the budget, funding the schedule or confirming net cash flow, the calculation remains preliminary and should not support an irreversible payment.

Choose a tool for your question

State one current question: find options within budget, compare identified properties, test a payment schedule, assess rent, prepare a reservation or collect documents before the next payment. A tool should give one clear outcome and next action rather than another open tab.

Close a stage with an outcome, not a mark count

Opening a page, filling a field and receiving a document are actions, but not necessarily completed stages. Distinguish started, received, under review, confirmed and blocked. Having an SPA, for example, does not mean that the seller, unit, price and exit terms have been verified.

Before reservation, signing, another payment and handover, run a separate review of the answers and unresolved issues. The GOV.UK Check answers pattern gives users an opportunity to review information before confirming a transaction; a property purchase needs that check before each irreversible action, not only once at the end.

Save a dated snapshot before changing device or browser

Personal-tool data is held in the browser, so do not assume it will appear automatically in another browser, profile or device. Before clearing site data, moving computer or making a material update, save a copy that identifies the date, project, unit and open questions.

Your marks are kept only in this browser: clearing site data or switching device will not carry them over. They can be viewed, edited and deleted by the user. Local storage is useful for a working draft, but it should not be the only archive of a decision or evidence of a contractual term.

Do not place sensitive documents in ordinary notes

Most calculations need only an amount, date, status and non-sensitive document label. Do not enter a full passport number, bank account, signature, statement, password, access code or complete legal report into a notes field, copied output or messenger message unless genuinely necessary.

Data-minimisation practice means using only the information required for a particular purpose. Cambodia's Law on Electronic Commerce also provides for reasonable protection of personal information held electronically. Where a professional needs the document, agree the secure channel, recipient, purpose and retention period first.

Know when the tool must hand the issue to a professional

A calculator tests a scenario but does not confirm a tax base or available finance. A checklist organises questions but does not establish the seller's right, absence of encumbrances, eligibility of an ownership structure or legal effect of the SPA. A visual viewing does not prove concealed condition, fire safety or design compliance.

Before an irreversible action, send legal questions to independent Cambodian counsel, technical questions to the relevant engineer, tax questions to an adviser addressing the specific owner and banking questions to the bank that will execute the transfer. The tool should identify the question and document requiring review rather than appear to approve the transaction.

Check the date, source and change status of the data

A price, exchange rate, unit availability, construction stage, service charge, rental comparable and tax rule all need a date. Older information may still provide context, but it should not appear current; record what can change and when a re-check is required.

UK Government Analysis Function guidance recommends communicating quality, uncertainty and change because limitations affect the conclusions users draw. Where sources conflict, do not silently select the convenient figure: retain both, explain the difference and identify the document or party that must resolve it before the next step.