HDB Upgrade Planner

The HDB Upgrade Planner works out what an HDB-to-private move costs you in cash. You enter your current flat (type, original purchase price, estimated current value), what is still owed on it (outstanding mortgage, and the CPF you used including accrued interest), your target property (private condo, EC, landed or HDB resale, plus a budget), and your profile (citizenship, and whether you will hold one property after the purchase or two). It returns your net sale proceeds after the mortgage, the CPF refund and selling costs; the capital gain on the flat; the total upfront cost of the purchase — down payment, BSD, ABSD where it applies, and the resale levy on a subsidised second flat or EC; and the cash you need at completion.

You can find it on ShiokNest under the Advisor tab. The two upgrade paths are chosen by the Properties After Purchase answer. Sell the HDB first and its net proceeds are applied against the purchase. Keep the HDB and you are a second-property owner: ABSD is charged at your profile's rate, and because the flat is still unsold when stamp duty falls due, the planner does not net the sale proceeds off — the figure it shows is what you must have on hand. For eligibility and HDB sale rules, pair with the HDB Eligibility Advisor; for a line-by-line sale statement including SSD, use the Cash Proceeds Calculator.

The HDB-to-private upgrade is the transaction where Singapore homeowners most commonly discover, mid-process, that they have less money than expected. The primary source of surprise is CPF accrued interest: when CPF OA funds are used to purchase an HDB flat, those funds — plus the interest at the CPF OA rate (currently 2.5% per annum) that would have been earned had they stayed in CPF — must be returned to CPF upon sale. For a flat purchased 10 years ago with $150,000 CPF, the accrued interest at 2.5% compounded is approximately $42,000. The total CPF refund is $192,000, not $150,000. The planner asks for that refund figure rather than estimating it, because your exact principal-plus-interest balance is stated on your CPF statement and in the HDB resale completion statement — enter the full amount, not the principal, or every number that follows is overstated.

The second most common surprise is the ABSD timing trap. An upgrader who buys the private property before completing the HDB sale is a second-property owner during the ownership overlap, triggering 20% ABSD on the private property price (for Singapore citizens). On a $1.5M condo that is $300,000 — remittable if the HDB is sold within 6 months, but payable in full within 14 days of exercising the option. Many upgraders can service the private mortgage yet cannot fund that stamp duty while waiting for HDB completion, and the money from the flat has not arrived to help. Answer 2 (Keep HDB) and the planner shows the cash requirement without crediting the unsold flat, which is the number that decides whether this path is executable at all.

What the planner does not do is as important as what it does. It takes no income figure, so it does not test your borrowing capacity — run the TDSR Calculator for that, because a purchase you can fund upfront can still fail the servicing ratio. It does not track your Minimum Occupation Period, does not forecast what your flat will be worth later, and does not search backwards for the sale price that would close a shortfall: adjust the target budget or the estimated sale value and re-run to find that yourself. Selling costs use the site-wide agent and legal defaults rather than your actual quotes, and Seller's Stamp Duty is not modelled at all — if you are selling inside the SSD window, add it from the SSD Calculator.