NovChoose a budgeting currency before comparing properties
A practical way to compare homes priced in different currencies without confusing a consistent budgeting base with the exchange rate that will actually be available at settlement.
This article reflects the named expert’s practical perspective. See NovAsia’s editorial policy for how material is prepared and reviewed.
A buyer can be looking at a Thai-baht price, holding savings in euros and discussing a contract that ultimately requires dollars. If every property is converted using whichever number happens to be easiest to find at that moment, the shortlist starts moving for reasons that have nothing to do with the homes.
I prefer to separate the currency used to **measure the buyer’s budget** from the currencies used by the seller, the contract and the eventual payment route. The budgeting currency is a ruler. It gives the buyer one stable way to compare the size of competing commitments today. It does not predict the rate at which money will later be exchanged.
Give the personal ceiling one unit
Suppose a buyer says the comfortable purchase ceiling is the equivalent of 200,000 in the currency in which they normally think about savings. Property A is listed in baht and Property B in dollars. The first useful step is not to decide which currency will strengthen. It is to put both offers on the same dated basis.
That basis should be identified. A central-bank reference rate, a public mid-market indicator and an executable customer quote are not interchangeable. The European Central Bank, for example, says its reference rates are published for information and are not transaction prices. They can still be perfectly useful for a consistent comparison table, provided the table does not imply that the buyer can execute a large property conversion at that exact number.
Once the buyer has one budgeting currency, a change in the shortlist means something. A more expensive property is more expensive because of its price and terms, not because it happened to be converted through a different source.
Keep the seller’s currency visible
Converting everything into the buyer’s familiar currency should not erase the original obligation. If the seller’s price is 7 million baht, that figure remains important even if the comparison sheet shows an approximate amount in euros. The buyer needs to be able to move back from the personal-budget number to the actual offer.
This matters because a budget conversion is an analytical layer, not a rewrite of the contract. A buyer may discover that a home fits the personal ceiling at today’s reference rate but leaves little room for furnishing, taxes, legal work or other transaction costs. Another property may look more expensive in the listing currency yet leave more room in the total personal plan.
A comparison therefore carries both numbers: the original price and the translated budgeting amount, with the translation method dated.
Do not let each property choose its favourite rate
Inconsistent conversion is an easy way to create accidental bias. One listing may be translated with a bank app, another with a search-engine converter and a third with yesterday’s provider quote. Every number can be genuine while the table as a whole becomes unreliable.
For a shortlist, I would use one method at one point in time. If the buyer later obtains an executable quote for the amount they actually intend to convert, that quote belongs in a separate settlement calculation. This distinction keeps property selection and FX execution from contaminating each other.
It also makes updates easier. If exchange rates move enough to affect affordability, the whole shortlist can be refreshed on the same basis. There is no need to pretend that the first conversion was permanent.
Instalments turn one property price into several FX moments
A staged payment plan makes the distinction even more important. The contract price may remain fixed in one currency while the buyer makes several conversions over months. Converting the entire price today can answer, “How large is this commitment relative to my present budget?” It cannot answer, “What will every future conversion cost?”
Imagine, purely as a planning example, four equal contractual instalments. The buyer may use one current reference basis to decide whether the property belongs on the shortlist. The actual exchange cost of each instalment will depend on the quote available when that conversion is made, unless the buyer has a documented arrangement that says otherwise.
This is why a currency buffer and a property contingency should not be casually merged. One covers uncertainty in the cost of obtaining the payment currency; the other may cover property-related expenses. They solve different problems.
A budgeting currency is a decision tool, not a market view
There is no universally correct budgeting currency. A person who earns and saves mainly in euros may naturally choose euros. Someone whose long-term financial life is in another currency may choose that instead. The test is whether the unit makes the buyer’s own ceiling understandable and whether every property is measured consistently.
If the settlement currency later changes, the calculation needs rebuilding. If a live quote becomes available, it replaces the reference assumption for the action it covers. If nothing material changes, the budgeting currency keeps doing its modest job: helping a person compare homes without quietly changing the ruler between them.
That is enough. Property selection is already a complicated decision. It does not need an accidental currency bet added to every row of the shortlist.
Sources
- European Central Bank — “Euro foreign exchange reference rates” and “What is the role of exchange rates?”: reference rates are informational and need not match executable transaction rates; accessed 6 October 2026.
- UK Financial Conduct Authority — “Consumer Duty: International payment pricing transparency — good and poor practice”: the exchange rate, amount, mark-up and fees all matter to an informed comparison; accessed 6 October 2026.