Quick answer: Cash buyers negotiate harder on resale and skip FX spread on staged payments. Instalment plans help off-plan cash flow but require FET on each foreign-currency tranche, lawyer maps the schedule.
Developer risk: the elephant in the instalment room
The comparison is usually framed as a financial one, and it is really a risk one. Paying cash for a completed unit and paying instalments on an off-plan build are not two ways to buy the same thing; they are two different transactions with different failure modes.
| Risk | Cash on completed stock | Instalments on off-plan |
|---|---|---|
| Completion | None. It exists | Real. Thai off-plan has historically run 6-18 months late |
| Your money before you hold anything | Nil beyond the transfer | Often 70-90% by the final milestone |
| FX exposure | One date, one rate | Several dates across years |
| FET documentation | One record | One per qualifying tranche, each of which must be correct |
| Recourse if it stalls | Not applicable | Whatever the contract says, and nothing more |
| Discount available | Real, because you remove the developer’s risk | Rare, because you are the developer’s funding |
That last row explains most of what follows. A cash buyer on completed stock is doing the seller a favour: removing uncertainty, closing quickly, no chain. An instalment buyer on off-plan is providing working capital, and the price for that is set by the developer rather than negotiated by you.
The arithmetic, run honestly
The standard argument for instalments is float: money not yet paid to the developer can earn elsewhere. The standard argument for cash is the discount. Both are real, and which wins depends on three numbers you can actually estimate.
| Input | Where it comes from |
|---|---|
| Discount achievable for cash | Ask. On completed stock 3-5% off list is a normal conversation; on hot off-plan it may be nil |
| Return on the float | Your genuine after-tax return on money you would otherwise have deployed, not a hoped-for one |
| Probability and cost of delay | The developer’s delivery record, and what the contract pays you if they slip |
Worked through on a 5,000,000 THB purchase: a 5% cash discount is 250,000 THB, taken immediately and with certainty. To beat that, an instalment buyer holding an average float of roughly 2,500,000 THB over two years needs about 5% a year after tax, and needs the project to complete on schedule.
Those two conditions are not independent. The years in which float returns are attractive are frequently the years in which construction finance is expensive and developers are under strain. Treat them as one combined bet rather than two separate ones.
Interest rates change the answer, but not as much as delay does
| Rate environment | Effect on the instalment case |
|---|---|
| Higher rates | Float earns more, so instalments look better on paper |
| Lower rates | Float earns little; the cash discount dominates |
| Any rates | A 12-month delay outweighs a plausible float return in almost every scenario |
The delay row is the one worth internalising. A 5% annual return on a 2,500,000 THB float is roughly 125,000 THB a year. A twelve-month delay costs you a year of rental income on the finished unit, which on the same purchase at a modest yield is comfortably more than that, before counting the cost of having your money committed with nothing to show for it.
When each genuinely wins
Cash wins when the stock is completed, the discount is meaningful, the developer is unknown or unproven, or you want the transaction finished rather than managed. It also wins for anyone who would find a multi-year payment schedule stressful, which is a legitimate criterion and not a soft one.
Instalments win when the developer has a real delivery record you have verified by visiting completed buildings, the schedule is tied to defined milestones rather than dates, the contract carries a delay penalty and a long-stop date, and you have a genuine use for the liquidity, a business, a reserve, a commitment you would otherwise have to break.
The hybrid is often the sensible answer and is rarely presented: cash for completed or resale stock, instalments only where the developer is established and the milestone structure is credible.
Buyer scenarios
Scenario A, cash on completed stock at $192,000. Buyer negotiates 4% off a $200,000 list price on a finished unit, transfers once, obtains one FET record, and is letting within six weeks. No construction risk, no schedule to manage, no further currency exposure. Gives up whatever the $200,000 might have earned elsewhere over the same period.
Scenario B, off-plan instalments at $220,000. 30% at SPA, 40% across eighteen months, 30% at handover. Three or four separate currency conversions, each needing its own FET record, and 70% committed before handover. Works if the developer’s record is verified and the contract has teeth. If the build slips twelve months, the float argument becomes irrelevant.
Scenario C, hybrid. Cash for a resale unit that exists today, instalments only on a pre-construction purchase from a developer with completed buildings you have walked through and a schedule with defined milestones. Splits the risk deliberately rather than by default.
Red flags on an instalment schedule
- Milestones defined as dates rather than verifiable construction events. “Month 12” is a calendar entry; “completion of structural works, certified independently” is a milestone.
- No delay penalty and no long-stop date. The most likely adverse event, with no contractual remedy.
- Payments to an account that is not the project’s. Confirm the receiving entity matches the party named in the contract.
- A “0% interest” plan on a list price you were never allowed to negotiate. The financing cost may simply be embedded in the price. Ask what the cash price would be, then compare.
- Front-loading beyond the market norm. A schedule wanting 50%+ at contract on an early-stage build is asking you to fund construction on trust.
Insider tip: calendar each SWIFT transfer at least ten working days before its milestone, with your lawyer copied. Bank compliance checks add days rather than hours, and a late tranche can trigger a penalty clause on a contract where every other term is in the developer’s favour. Budget an additional 50,000 THB or so beyond the purchase price for legal fees, transfer taxes and furnishing; buyers who budget the headline price alone are the ones who stall at handover.
Compare cash vs installment on real projects
We help you evaluate developer track records, schedules, and negotiated net pricing, not just marketing APR language.
What the discount actually costs the developer, and why that sets the size of it
Understanding why a discount exists tells you how hard to push and when to stop.
A developer selling completed stock is holding an asset that costs money: financing on the unsold inventory, CAM and sinking fund contributions on units nobody owns, sales staff, and the drag on the project’s reported absorption. A cash buyer closing in six weeks removes all of that. The discount is the developer sharing part of a saving they actually make, which is why it is negotiable and why it has a ceiling.
A developer selling early-stage off-plan is in the opposite position. Your instalments are cheaper than construction finance, so you are providing something they value, and the price of it is the payment schedule rather than a discount. Asking for both a payment plan and a cash discount is asking to be paid twice for one thing, and it is where negotiations on off-plan usually stall.
The practical consequence is to negotiate the right thing in the right transaction. On completed stock, push the price. On off-plan, push the terms: the delay penalty, the long-stop date, the final tranche payable after snagging closes, the specification schedule attached as a contractual annex. Those cost the developer nothing today and are worth more to you over a multi-year build than two percent off the headline.
What changes if you are borrowing at home
A significant number of buyers fund a Phuket purchase by releasing equity at home rather than from savings, and that changes the comparison in a way neither of the standard arguments accounts for.
If the money is borrowed, the float does not sit idle waiting to be deployed. It is either drawn and costing interest, or undrawn and available. Instalments let you draw progressively, so you pay interest only on what has been drawn, which is a genuine and often substantial saving against drawing the full amount on day one.
That can flip the comparison entirely. A buyer paying 5% on a home-country facility saves real interest by drawing in tranches, and that saving is certain in a way an investment return is not. Set it against the cash discount forgone, and the answer depends on the two rates rather than on any view about construction.
Two cautions. Currency mismatch between a home-currency loan and a baht-denominated schedule is a real exposure across a multi-year build, and it compounds rather than nets off. And a lender’s willingness to lend is not permanent: a facility available at contract may not be available at the final milestone, which is a risk cash buyers simply do not carry.
Summary table
| Factor | Cash | Instalment |
|---|---|---|
| FX exposure | One date, one rate | Several dates across the build |
| FET records needed | One | One per qualifying tranche, typically 3-6 |
| Discount available | 3-5% is a normal conversation on completed stock | Rare; you are the developer’s funding |
| Completion risk | None on completed or resale stock | Real, and the dominant variable |
| Liquidity retained | None after transfer | Substantial early, falling over the schedule |
| Administrative load | One transaction | A schedule to manage for years |
Resale: the argument nobody makes at the time
Payment method affects your exit, and it does so in a way that only becomes visible years later.
A cash purchase of completed stock leaves you holding a registered title from the outset. You can sell whenever you choose, and the buyer is acquiring a finished asset with a documented history.
An off-plan instalment purchase leaves you holding a contract until transfer. Selling before completion means assigning that contract, and whether you can do so at all depends on the SPA. Many Thai developers restrict assignment, charge a fee for it, or prohibit it outright until a stated percentage has been paid. Some permit it freely because it suits them. Read the clause before you sign, because a buyer who needs to exit at month eighteen of a thirty-six-month build has no other route.
Even where assignment is permitted, the market for a part-paid contract is thinner than the market for a finished unit, and it is thinnest exactly when you would want to use it: in a soft market, where the developer is also still selling similar contracts at current prices with a marketing budget behind them.
None of this argues against off-plan. It argues for treating the assignment clause as a term worth negotiating alongside the delay penalty, and for not choosing a multi-year instalment schedule with money you might need back.
The FET point, which applies to instalments specifically
Freehold registration by a non-resident requires the purchase funds to have arrived from abroad in foreign currency, evidenced by an FET record from the receiving Thai bank. On a cash purchase that is one document, checked once.
On an instalment plan it is one document per qualifying tranche, and each must carry the right name, the right amount and a reference to the property. An error found at registration, three years after the transfer that caused it, is difficult and slow to correct. File each record as it is issued rather than assembling the set at the end.
The money has to arrive as foreign currency and be converted by the receiving Thai bank. If it is converted to baht at the sending end, there is no inbound foreign-currency conversion for the bank to certify, and the record you needed cannot be produced afterwards.
For the full sequence, see proof of funds and FET, and for assessing the construction risk this whole comparison turns on, off-plan property in Phuket and due diligence step by step. Budget the surrounding costs with hidden costs of buying property in Thailand.
Frequently Asked Questions
Sometimes, buyers often negotiate roughly 3-5% off list in discussions, but discounts vary by project, inventory, and timing.
They are typically structured without bank interest, but the economic cost may still exist if the list price is higher than a cash-negotiated price.
Cash purchases of completed units reduce construction risk. Installment purchases shift risk until completion milestones are achieved.
Yes in theory, but investment returns are uncertain. Compare risk-adjusted returns against developer risk and any cash discounts.
ROI depends on purchase discount, construction risk, occupancy, rental yield, and alternative investment returns. There is no universal winner.
Related Guides:
- Thailand Property Tax for Foreigners, what the income and exit charges actually are
- Hidden Costs of Buying Property in Thailand, the lines that sit outside the purchase price
- Buying Property in Phuket, the full purchase roadmap
- Off-Plan Property in Phuket, how to assess construction risk
- Proof of Funds and FET, documenting each tranche correctly
Maksim Shchegolev
Founder, MORE Group
Founder of MORE Group. Four years in investment banking before moving to Phuket, where he has worked in the local property market since 2018. Oversees developer relationships and every engagement above $300K.
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