A bank letter of offer (LO) is the document that turns a loan estimate into a real financing commitment. It sets out the loan amount, tenure, interest structure, lock-in and fees, and once you accept it, you are bound to those terms. You get it after you have a valid Option to Purchase and a formal credit assessment, not before. Below we walk through how to obtain it, what each clause means, the extra cash costs that follow, and the mistakes we see buyers make.
TL;DR
- The letter of offer is a binding contract. An In-Principle Approval (IPA) is only a non-binding estimate, typically valid for about 30 days.
- You need a valid Option to Purchase (or confirmed flat) before the bank will convert your IPA into a letter of offer.
- Check the loan quantum, interest package, lock-in (often 1 to 3 years), penalties and expiry date before you sign.
- Budget cash for legal fees and mortgage duty on top of the downpayment: the minimum is 25% of the price, with at least 5% in cash.
- Ask a banker or property consultant to explain any clause you do not understand before you accept.
Table of Contents
- What a letter of offer actually is
- How to get a letter of offer, step by step
- What to check in your letter of offer
- The cash you still need after the loan is approved
- Where we see buyers go wrong
- Our perspective
- Getting help before you sign
- FAQ
- Sources
What a letter of offer actually is
The letter of offer is the formal document in which a bank states the final terms of the property loan it is willing to grant you. Research on the Singapore rules shows that banks must give borrowers a Residential Property Loan Fact Sheet that summarizes the key features of the loan, at or before the time the letter of offer is issued. Read the fact sheet and the letter together. The fact sheet is the plain-language summary, and the letter is the contract.
The Association of Banks in Singapore advises borrowers to rely on official written documents from the bank, meaning the fact sheet and the letter of offer, and not on verbal promises or preliminary figures. That is the single most useful habit in this whole process.
Letter of offer versus IPA
Buyers often mix these up, so here is the difference side by side.
| In-Principle Approval (IPA/AIP) | Letter of offer (LO) | |
|---|---|---|
| Nature | Non-binding estimate | Binding contract |
| Based on | Your declared income and debts | Formal application and credit assessment |
| Validity | Typically about 30 days | Stated on the letter itself |
| Needed for | Planning your budget and price range | Exercising the OTP or signing the sale agreement |
| Commits the bank? | No | Yes, within its terms |
The ABS home loan guide describes the IPA as a preliminary assessment that is not a commitment to lend. IPA validity is set by each lender, so check the date printed on your own letter rather than assuming 30 days. If you are still at the estimate stage, our guide to In-Principle Approval in Singapore covers it in detail.
How to get a letter of offer, step by step
- Get an IPA first. It tells you roughly how much you can borrow before you commit to a price. It also shows whether your Total Debt Servicing Ratio (TDSR) leaves room.
- Secure the property. For a private resale, that means a valid Option to Purchase from the seller. For an HDB flat, HDB explains that after you confirm the flat, you can ask your chosen financial institution to convert the IPA into a Letter of Offer.
- Submit the formal application and documents. Expect to provide income documents, your loan repayment history and, for owners of other properties, property portfolio details. Requirements differ by bank, so ask your banker for the exact list.
- Wait for the credit assessment and valuation. The bank values the property, and that valuation can differ from your purchase price. See bank valuation versus market valuation for why this matters.
- Receive and review the letter of offer. Read every page. Compare it against the IPA and the fact sheet.
- Accept within the validity period. Sign and return it, then appoint your conveyancing lawyer to proceed.
A caution from the research: the letter of offer is required before you exercise an OTP on a resale property or sign an Agreement for Lease on a new HDB flat, so plan the timing. Do not let the OTP exercise date arrive before the letter does. If your timeline is tight, talk to your banker and your agent on day one.
What to check in your letter of offer
Most problems come from a handful of clauses. Go through them with a pen.
Loan amount and loan-to-value
Confirm the loan quantum matches what you budgeted. For a bank loan, the maximum is up to 75% of the bank valuation or the purchase price, whichever is lower. If the valuation comes in low, you cover the gap in cash. Our article on loan LTV for residential purchases and the one on low valuations and cash gaps show how that plays out.
Interest rate structure
Look at how the rate is defined: fixed or floating, what it is pegged to, the spread, and what happens after the initial period. Bank loan rates move with the market, unlike the more stable HDB concessionary rate, as CPF Board notes. Write down the rate for each year of the package, not just year one. For the wider choice, read our HDB or bank loan decision guide.
Tenure and monthly instalment
Check that tenure and instalment match your plan. The regulatory caps matter here: the MAS rules for new housing loans set a TDSR limit of 55% of gross monthly income, and a Mortgage Servicing Ratio (MSR) limit of 30% for HDB flats and ECs. We compare them in TDSR vs MSR.
Lock-in period and penalties
This is the clause that bites later. Lock-ins in bank letters of offer typically run 1 to 3 years, with penalties for full or partial redemption or refinancing during that time. Note the exact penalty percentage, whether partial prepayments are allowed, and any clawback of legal subsidies or valuation fees if you leave early. If you may sell or refinance within three years, this clause should drive your choice of package. Our guides on refinancing options and refinancing versus repricing legal costs help you model it.
Cancellation fees and expiry
Accepting the letter commits you. The ABS guide notes that cancellation fees may apply if the loan is not drawn down. Find the expiry date, and if completion could be delayed, ask the bank now about extending the offer. Validity periods vary between banks, so read your own letter rather than relying on forum rules of thumb.
Change-of-terms clause
Banks should give you written notice at least 30 days before varying the terms of an existing housing loan, according to the ABS guide. Know what the letter allows the bank to change, and when.
The cash you still need after the loan is approved
A letter of offer does not fund the whole purchase. For a bank loan, the downpayment is 25% of the price, with at least 5% in cash and the remaining 20% payable in cash or CPF Ordinary Account savings. On top of that, plan for these.
- Mortgage duty. IRAS charges 0.4% of the loan amount on a mortgage, subject to a maximum of $500. It is separate from Buyer’s Stamp Duty.
- Legal fees. You appoint a law firm to handle the mortgage. If you use CPF for an HDB flat financed by a bank loan, the CPF Conveyancing Panel arrangements apply: HDB may act for you, or you may engage a private law firm. Using a firm outside the panel can mean extra fees for coordination.
- Valuation and other fees. These depend on the bank’s package, so list them from the letter.
Ask your solicitor whether mortgage duty is included in the quoted package. Other markets also run fixed-fee models, for example conveyancing services for buyers in New South Wales, so asking for a clear fee breakdown in writing is a reasonable request wherever you buy.
Where we see buyers go wrong
- Treating the IPA as an approval. Paying an option fee on the strength of an IPA alone leaves you exposed if the final assessment differs.
- Ignoring the lock-in until you want to leave. Buyers pick the lowest year-one rate and then cannot refinance without a penalty.
- Forgetting that HDB-to-bank is a one-way door. Once you refinance an HDB loan to a bank loan, you cannot switch back.
- Underbudgeting cash. A low valuation, legal fees and mortgage duty all land at completion.
- Letting the letter expire. If the seller delays completion, the offer may lapse before you draw down.
Our perspective
We see the letter of offer as the moment a property plan becomes a financial commitment, so we treat it as a planning document, not paperwork to sign at the end. Our approach starts with the client’s objective and the exit strategy: staying for ten years is a different loan from a three-year hold, and the lock-in clause should reflect that. Aman’s background spans engineering and real estate, so we like to test the numbers, including the instalment at higher rates, before a client commits.
We also push clients to line up the loan with the whole purchase: valuation, cash buffer, legal appointment and renovation plans. A letter of offer that is perfect on paper but leaves no cash for the renovation or the legal fees is not a good offer for you. If you are comparing financing routes, our guide to mortgage eligibility rules is a good place to start.
— Aman
Getting help before you sign
If you are buying, selling or investing and want someone to go through your letter of offer against your plan, our real estate consultancy and valuation services are built for that. We help with purchase strategy, valuation, post-purchase guidance and exit planning, whether you are looking at residential listings or a new launch. Bring the letter and the fact sheet, and we will walk through them with you.
FAQ
Is a letter of offer the same as loan approval?
It is the formal confirmation of the terms the bank will lend on, and it is binding once you accept. An IPA is different: it is a preliminary, non-binding estimate. Only the letter of offer confirms the bank’s contractual commitment.
How long is a bank IPA valid for?
Most IPAs in Singapore last about 30 days, but there is no single rule, as each lender sets its own period. Check the date on your letter. Refresh the IPA if your timeline drags or your finances change.
When do I get the letter of offer?
After you have a valid Option to Purchase or have confirmed your flat, and the bank has finished its formal assessment. For HDB flats, you ask your financial institution to convert the IPA into a letter of offer. You then need it before exercising the OTP on a resale property.
Can I negotiate the terms in a letter of offer?
Yes, before you accept. Ask your banker about the spread, lock-in length, penalty and legal subsidy. Once you sign, the terms bind you, so raise questions first.
Sources
- MAS Notice 632A, Residential Property Loans Fact Sheet
- ABS, Housing Loans guide (updated August 2026)
- ABS, About Home Loans 2025
- HDB, Housing Loan from Financial Institutions
- CPF Board, HDB loan or bank loan? 3 differences
- MAS, Rules for New Housing Loans
- IRAS, Mortgage Duty
- CPF Conveyancing Panel
- PropKaki, IPA validity for home loans
- ACDNSW, Conveyancing services for buyers
