The HDB-to-private upgrade comes with its own alphabet soup — ABSD, TDSR, MSR, LTV, CPF accrued interest, MOP. Half the stress of upgrading is just not knowing what the terms mean. So here’s a plain-English reference to every term you’ll encounter, in the words I’d use explaining it across my desk. Where a term has a full deep-dive, I’ve linked it.
The calculator turns ABSD, CPF refund, TDSR and LTV into real figures for your situation.
ABSD (Additional Buyer’s Stamp Duty)
A tax on the purchase of residential property, charged on top of BSD, based on how many residential properties you’ll own after buying. For Singapore Citizens, it’s 0% on your first property and 20% on your second. Sell your HDB first and your condo is your first property (no ABSD); buy first and it’s your second (20%, refundable if you sell within 6 months). See ABSD for HDB Sellers.
Accrued Interest (CPF)
The 2.5% per-year compound interest your CPF Ordinary Account would have earned on the money you withdrew for your flat. When you sell, you must refund both the principal and this accrued interest to your OA — which is why your cash proceeds are smaller than your “profit.” See CPF Accrued Interest Explained.
Annual Value (AV)
The estimated yearly rent your property could fetch, set by IRAS. It’s the basis for your property tax — and a condo’s AV (and tax) is typically higher than your HDB’s.
Approval-in-Principle (AIP / IPA)
A bank’s conditional indication of how much it will lend you, before you commit to a property. Getting an AIP first tells you your real budget so you shop within reach. Strongly recommended before viewing.
Bridging Loan
A short-term loan (typically up to 6 months) that advances your expected HDB sale proceeds so you can complete your condo purchase before the sale money arrives. It counts toward your TDSR while outstanding. See Simultaneous Sale and Purchase.
BSD (Buyer’s Stamp Duty)
The standard stamp duty on any property purchase, graduated from 1% to 6% of the price (rates since 15 Feb 2023). On a $1.5M condo it’s about $44,600. Payable by everyone, on top of any ABSD. See Full Cost Breakdown.
BTO (Build-To-Order)
A new HDB flat bought directly from HDB and built on demand. BTO flats carry a 5-year MOP from key collection before you can sell or buy private.
BUC (Building Under Construction)
A property still being built — i.e. a new launch. BUC purchases are paid via the Progressive Payment Scheme. See Progressive Payment Cash Flow.
CCR (Core Central Region)
URA’s prime central market segment — Districts 9, 10, 11, the Downtown Core and Sentosa. The most expensive region, and rarely a first-time upgrader’s entry point. See OCR vs. RCR vs. CCR.
Completion
The legal point at which ownership transfers and the balance of the price is paid — for your HDB sale (you receive proceeds and your CPF is refunded) and for your condo purchase (you pay the balance and get the keys).
CPF Ordinary Account (OA)
The CPF account you can use for housing. It earns 2.5% p.a. Money you draw from it for a flat must be refunded — with accrued interest — when you sell, after which it can fund your next home’s CPF-eligible downpayment. See How Much CPF Do You Get Back?.
CSC (Certificate of Statutory Completion)
The final certification of a new development, triggering the last progressive payment (typically 15%). Comes after TOP.
Decoupling
Transferring one co-owner’s share of a property to the other, leaving a sole owner. Banned for HDB flats since 2016 (except for divorce, death and similar life events). Still possible for private property, but doesn’t help HDB owners. See HDB Decoupling Options.
Downpayment
The portion of the price not covered by your loan. With a 75% loan it’s 25% — of which at least 5% must be cash and the rest can be cash or CPF. With an outstanding housing loan, the loan drops to 45% and the downpayment rises to 55%. See CPF OA for Condo Downpayment.
EC (Executive Condominium)
A hybrid of public and private housing — condo facilities at a 15–25% discount, but with an income ceiling ($16,000/month), a 5-year MOP, and the tighter MSR loan cap. Privatises fully after 10 years. See EC vs. Private Condo.
HDB Resale Levy
A levy payable when a second-time applicant buys another subsidised flat or EC from HDB. It generally does not apply when you buy a private condo — one of the cost reliefs of going private.
LTV (Loan-to-Value)
The maximum loan as a percentage of the property’s value. 75% if you have no other housing loan; 45% if you still have an outstanding HDB loan when the condo loan is granted. This single ratio decides whether your downpayment is 25% or 55%. See Upgrading with an Outstanding Loan.
MCST / Maintenance Fees
The Management Corporation Strata Title runs your condo’s common property; you pay monthly maintenance fees (often $300–$600+) for upkeep of facilities. A recurring cost HDB owners often underestimate.
MOP (Minimum Occupation Period)
The time you must live in your HDB flat — usually 5 years (10 for Prime/Plus flats) — before you can sell it or buy private property. The clock counts actual occupation. Your upgrade can’t begin until it’s served. See MOP Explained.
MSR (Mortgage Servicing Ratio)
A cap limiting your home-loan repayment to 30% of gross monthly income — but it applies only to HDB flats and ECs, not private condos. Upgrading to private frees you from MSR; only TDSR applies. See TDSR for Upgraders.
New Launch
A brand-new condo sold off-plan by a developer, paid via the Progressive Payment Scheme, with move-in (TOP) years away. Its long runway helps upgraders avoid interim housing. See New Launch vs. Resale.
OCR (Outside Central Region)
URA’s suburban / mass-market segment — where most HDB estates sit and most upgraders buy their first private home. The best value per dollar for upgraders. See OCR vs. RCR vs. CCR.
OTP (Option to Purchase)
The document that secures a property for you. You pay an option fee, then exercise the OTP (usually within 14 days) to commit; stamp duties fall due within 14 days of exercising. Both HDB sales and condo purchases use OTPs.
Progressive Payment Scheme (PPS)
The staged payment structure for a new launch (BUC) — 5% booking, 15% at signing, then milestone-linked draws as construction advances, with the loan disbursing progressively. Keeps early cash flow light. See Progressive Payment Cash Flow.
Property Tax
An annual tax based on your property’s Annual Value, payable to IRAS. Owner-occupied rates are lower than non-owner-occupied. Expect it to be higher on your condo than on your HDB.
RCR (Rest of Central Region)
URA’s “city-fringe” segment — the band around the prime core, offering centrality a step below CCR prices. Suits dual-income households with a genuine budget buffer. See OCR vs. RCR vs. CCR.
Remission (ABSD)
A refund of ABSD paid upfront. A married couple (at least one Singapore Citizen) buying a replacement home can reclaim the 20% ABSD if they sell their existing home within 6 months of the purchase. Miss the window and it’s forfeited. See ABSD for HDB Sellers.
Resale Condo
A completed, previously-owned condo you can view and move into quickly — paid in full on the normal completion timeline rather than in stages. See New Launch vs. Resale.
SSD (Seller’s Stamp Duty)
A tax on selling residential property within 3 years of buying it. Because HDB’s MOP is 5 years, by the time you can sell you’re past the SSD window — so SSD usually doesn’t apply to HDB upgraders.
Stamp Duty
The umbrella term for taxes on property transactions — BSD (everyone), ABSD (additional properties), and SSD (quick sales). Buyers pay BSD and any ABSD; sellers may pay SSD.
Stress Test Rate
The interest rate banks use to calculate your repayment for TDSR — a medium-term floor of 4% p.a. (since 30 Sep 2022), even if your actual rate is lower. It builds a buffer against rising rates into your loan eligibility. See TDSR for Upgraders.
TDSR (Total Debt Servicing Ratio)
The rule capping your total monthly debt repayments at 55% of gross income, stress-tested at 4%. It governs the maximum loan your income supports — and your existing debts (car, personal loans) eat into it. See TDSR for Upgraders.
Temporary Extension of Stay
An arrangement allowing an HDB seller to stay in the flat for a short period (up to 3 months) after completion, by agreement with the buyer — useful for bridging the gap to your condo’s move-in date. See Simultaneous Sale and Purchase.
TOP (Temporary Occupation Permit)
The point at which a new development is fit to move into, triggering the large 25% progressive payment. You collect keys and move in at TOP; CSC follows later.
Valuation Limit (VL)
The cap on how much CPF you can use for a property — generally its value or price, whichever is lower. Relevant when funding your condo from CPF OA. See CPF OA for Condo Downpayment.
Withdrawal Limit (WL)
A further cap on CPF housing use beyond the Valuation Limit (up to 120% of VL), available only if you’ve set aside your Basic Retirement Sum. Mainly affects older upgraders deploying large CPF balances.
Still unsure how these apply to your situation? Turn the jargon into your own numbers — it takes about two minutes.
Net cash from your HDB sale, ABSD exposure, and the condo budget you can actually afford — worked out in about 2 minutes.
General information for Singapore HDB upgraders, not financial, tax or legal advice. Rules and figures are set by HDB, IRAS, MAS and the CPF Board and can change. Verify current details with the relevant authority before acting.