Singapore HDB Contra Payment Calculator 2026 — Simultaneous Sell & Buy Cash Flow, Net Cash Injection or Surplus at HDB Completion, CPF OA Recycling, BSD & Resale Levy on Completion Day

An HDB contra payment arrangement is a same-day simultaneous completion of both your old flat’s sale and new flat’s purchase. HDB coordinates two resale completion appointments on the same day. The sale proceeds from your old flat are used directly (contra) to fund the purchase of the new flat. Only the net difference — cash surplus if the sale proceeds exceed the purchase costs, or cash injection if not — needs to be funded separately. It avoids the need for bridging loans and eliminates ABSD risk from temporary dual property ownership for Singapore Citizens.

On completion day: (1) Your buyer pays for your old flat. After deducting your outstanding loan, CPF refund, agent commission, and legal fees, the net cash is deposited to your bank account. (2) Simultaneously, you pay for the new flat using: your CPF OA (recharged from the old flat’s CPF refund, earmarked in advance); your HDB or bank loan drawdown (disbursed directly by the lender); and cash for BSD, resale levy, legal fees, and any cash down payment. (3) The net position = cash from sale minus cash costs for purchase. Positive = you receive cash; negative = you must bring cash to the appointment.

Your cash injection at completion = BSD on new flat + Resale Levy (if second-timer) + Buy legal fees + Cash down payment (5% of new price for bank loan; S$0 for HDB loan) minus Net cash from old flat sale. If this total is negative, you have a surplus. The most common contra cash costs for a S$600,000–S$800,000 new flat are: BSD S$12,600–S$19,600; Resale Levy S$30,000–S$40,000 (second-timer); Legal fees ~S$3,000. Total cash needed: often S$45,000–S$65,000 for second-timers, before offsetting against sale proceeds. Use this calculator for your specific numbers.

Yes, through CPF Board coordination. The CPF refund from the old flat sale does not formally credit to your OA on completion day — it takes 3–5 working days. However, your conveyancing lawyer submits the CPF withdrawal application for the new flat in advance, and CPF Board processes it using the anticipated refund amount. This “earmarking” allows the CPF to flow from old flat to new flat on the same day in practice. Your solicitor must be experienced in contra transactions to manage this CPF timing coordination effectively.

A regular HDB upgrading exercise involves two separate transactions: sell first, receive proceeds, then buy — often with a gap in between requiring temporary rental. Contra compresses both into one day. Key differences: Contra eliminates bridging loans and rental costs; Contra has tighter timeline coordination requirements; Contra eliminates ABSD risk from temporary dual ownership; Contra requires more complex legal and CPF coordination. Financially, the outcome (what you receive or pay) is the same — this calculator shows that net position in both cases, but the timing of cash flows is dramatically different.

Typically no. The entire point of contra is to avoid a bridging loan by settling both transactions simultaneously. However, if your new flat’s cash costs exceed your old flat’s net cash proceeds AND you don’t have sufficient personal savings, a short bridging loan (2–4 weeks) may still be needed for the shortfall period between when you need to pay BSD/deposits and when the completion day cash arrives. Bridging loan interest rates in Singapore are typically 4–5% p.a. on the outstanding balance, charged daily. Use this calculator to quantify the shortfall and determine if bridging is needed.

Typical HDB contra payment timeline: Weeks 1–3: List old flat, find buyer, sign OTP (sell). Weeks 3–6: Find and secure new flat, sign OTP (buy) — ideally simultaneously. Weeks 5–8: Exercise both OTPs within deadlines, submit resale applications to HDB concurrently. Weeks 8–14: HDB reviews and approves both applications (typically 6–8 weeks). Weeks 14–16: Completion appointments scheduled and executed on same day. Total: approximately 3–4 months from listing to keys. Delays in finding either the buyer or the new flat can extend this timeline.

No ABSD for Singapore Citizens when the old flat is sold on the same day as or before the new flat purchase. In a properly coordinated contra, both completions happen on the same day — so technically, you never own two residential properties simultaneously, and no ABSD applies. Singapore Citizens are entitled to a remission of ABSD on the second residential property if they sell the first within 6 months. In a same-day contra, you don’t even need the remission — no ABSD is triggered. Permanent Residents and foreigners have different ABSD rules and should consult a property lawyer.

Key risks: (1) Timeline risk — if your buyer pulls out after you’ve committed to the new flat purchase, you may own two properties temporarily (ABSD exposure); (2) Valuation risk — new flat’s valuation lower than expected, requiring additional cash; (3) CPF timing mismatch — if CPF Board coordination fails, completing both transactions on the same day becomes complex; (4) Incomplete resale applications — both transactions must be filed to HDB together; a deficiency in one can delay both. Engage an experienced property agent and conveyancing law firm with specific HDB contra transaction expertise to manage these risks.

When you submit both resale applications to HDB’s Resale Portal simultaneously, you flag them as a contra arrangement. HDB’s resale team reviews both applications concurrently. Upon approval, HDB schedules both completion appointments at the HDB Hub on the same day — typically in the morning (sale) and afternoon (purchase), or both in the same time slot. Your lawyers for both transactions attend. The CPF Board processes the OA refund and new flat withdrawal simultaneously. This coordination is HDB’s standard service — there is no additional fee for contra, though the process requires precise timing from all parties.

If your old flat sale falls through after you’ve committed to buying the new flat: you must proceed with the new flat purchase independently (pay for it without the sale proceeds) or negotiate a mutual cancellation with the new flat seller (losing any option fee paid). If the new flat purchase falls through while your old flat sale proceeds: you complete the sale and are temporarily without a home — you’ll need to find a new flat to buy, potentially renting in the interim. Both scenarios involve financial penalties and legal complications. This is why experienced agents typically ensure both OTPs are exercised in close coordination and with compatible timelines.

When you used CPF OA to pay for your current HDB flat, the CPF Board charges 2.5% per annum compound interest on the amount withdrawn, as if it had remained in your CPF OA. Upon sale, you must refund both the principal CPF amount used AND the accrued interest to your CPF OA. For example: S$200,000 CPF used for 8 years → Accrued interest = S$200,000 × (1.025^8 – 1) = S$43,800. Total CPF return = S$243,800. This significantly reduces your net cash from the sale. The longer you’ve owned the flat and the more CPF used, the larger the accrued interest deduction from your sale proceeds.

Yes — HDB resale chains can involve multiple contra arrangements. In a chain: Buyer A (buying a flat from you and simultaneously selling their own flat to Buyer B), you (selling to Buyer A and buying from Seller C), and Seller C. All three transactions can be coordinated by HDB on the same day. However, longer chains carry higher coordination risk — if any one link fails or delays, the entire chain is affected. Chains of 2–3 transactions are common in Singapore HDB resales; chains longer than 3 become very complex and most experienced agents try to avoid them.

If your net contra position is negative (sale proceeds less than purchase costs), you must bring the difference in cash to the HDB completion appointment. Common reasons for a negative contra: high CPF accrued interest from long ownership; resale levy as a second-timer; significant BSD on an expensive new flat; bank loan requiring 5% mandatory cash down payment. Options: (1) Accept the shortfall and bring cash savings; (2) Negotiate the new flat price down; (3) Look for a lower-priced new flat; (4) Consider a shorter-term bridging loan; (5) Withdraw from Supplementary Retirement Scheme (SRS) if applicable and eligible. This calculator helps you identify the exact shortfall before committing.

Documents needed: For both transactions: NRIC, Marriage Certificate (if applicable), HDB Loan Eligibility (HLE) letter or bank In-Principle Approval. For sell side: CPF withdrawal statement (from CPF website), HDB loan outstanding balance letter, property tax statement. For buy side: OTP for new flat, option fee receipt, HDB valuation report, CPF withdrawal form for new flat, BSD payment receipt (to IRAS). At completion: HDB’s resale appointment letter for both transactions, cashier’s order or bank transfer for any cash shortfall, identification documents. Your conveyancing lawyers manage most document preparation — ensure they are engaged at least 6 weeks before the estimated completion date.

There is NO additional HDB fee for a contra arrangement versus a sequential transaction. You pay the same: resale application fees (S$80 per transaction), legal fees (same as non-contra — approximately S$2,500 sell + S$3,000 buy), BSD (same), and resale levy (same). The saving from contra vs sequential is the bridging loan interest you avoid (4–5% p.a. on the bridging amount for 4–8 weeks, potentially S$3,000–S$8,000). Some law firms may charge a small premium for contra transactions due to the added coordination complexity — typically S$200–S$500 extra. Overall, contra is financially advantageous compared to sequential for most upgraders.