HDB Sales Proceeds Calculator: How Much Will You Net From Your Flat Sale?

Most HDB upgraders targeting Thomson Reserve make the same mistake – they look at their HDB transaction price and assume that is what they have to work with. It is not.

By the time your outstanding loan is repaid, your CPF principal and accrued interest are refunded to your CPF account, and agent commission and legal fees are deducted, what lands in your bank account is often significantly less than the headline sale price.

This free HDB sales proceeds calculator gives you the real figure – split into two clear amounts: net cash deposited to your bank account, and CPF refunded to your Ordinary Account. Know both numbers before you decide which Thomson Reserve unit type is within reach.

What the Calculator Deducts From Your HDB Sale Price

1. Outstanding Housing Loan

Whether you took an HDB concessionary loan or a bank loan, the full outstanding balance is repaid from your sale proceeds at completion. The calculator handles both loan types – enter whichever applies to your flat.

2. CPF Principal Withdrawn

Every dollar of CPF Ordinary Account savings used to purchase your HDB flat – for the initial downpayment and every monthly instalment paid via CPF – must be refunded to your CPF account when you sell.

3. CPF Accrued Interest

This is the figure that surprises most sellers. You do not just refund the CPF principal. You refund the principal plus the accrued interest that CPF Board calculates as if that money had remained in your OA earning the prevailing CPF OA interest rate of 2.5% per annum, compounded annually, for the entire period it was used.

Example: If you withdrew $200,000 in CPF over 12 years, the accrued interest at 2.5% compounded is approximately $63,000. You refund $263,000 to CPF – not $200,000.

The longer you have owned the flat and the more CPF you have used, the larger the accrued interest component. The calculator computes this automatically based on your CPF usage amount and years of ownership.

4. Property Agent Commission

The standard co-broking commission for HDB resale is 2% of the sale price, paid by the seller. On a $700,000 HDB, this is $14,000.

5. Legal and Conveyancing Fees

HDB resale legal fees are typically $2,000 to $3,500 depending on the law firm and sale price. These are deducted from your proceeds at completion.

6. Net Cash vs CPF Refund – Two Very Different Pots

Your HDB sale produces two separate amounts that serve completely different purposes in your Thomson Reserve purchase:

7. Net Cash Proceeds

This is the cash deposited into your bank account after all deductions. It is freely spendable – and it is what you use to fund the Thomson Reserve 5% booking fee (mandatory cash), Buyer’s Stamp Duty (BSD, also cash only), and ABSD if applicable. This is your most critical figure because several of the largest upfront costs at Thomson Reserve cannot be paid any other way.

8. CPF OA Refund

This is credited back to your CPF Ordinary Account – not to you as cash. You cannot spend it freely, but you can use it toward the Thomson Reserve downpayment (up to 20% of the purchase price) and monthly mortgage instalments. For most HDB upgraders, the CPF OA refund is the largest single source of funds for the balance downpayment.

Are You Eligible to Sell? Check Your MOP First

Before you can sell your HDB flat on the open market, you must have completed the Minimum Occupation Period (MOP):

• Standard HDB flats: 5 years from date of key collection
• Prime Location Public Housing (PLH) flats: 10 years from date of key collection

During the MOP you cannot sell your flat, rent it out in full, or own private residential property in Singapore. You must confirm you are eligible before planning your Thomson Reserve timeline.

Sell First or Buy Thomson Reserve First?

This is the single most consequential decision for HDB upgraders and the answer depends entirely on your cash position.

1. Sell HDB First

You are treated as owning zero residential properties at the point of Thomson Reserve purchase. Singapore Citizens pay 0% ABSD and qualify for 75% LTV. You need accommodation during Thomson Reserve’s construction period to estimated TOP 2031 (subject to regulatory approvals) – typically 4 to 5 years of rental in Upper Thomson at $3,000 to $5,000 per month for a family-sized apartment.

2. Buy Thomson Reserve First, Sell HDB Later

You pay ABSD of 20% of the purchase price upfront in cash, within 14 days of signing the Thomson Reserve Sale and Purchase Agreement. Your LTV also drops from 75% to 45% (if taking a 2nd mortgage). Married Singapore Citizen couples can apply for ABSD remission by selling the HDB within 6 months of Thomson Reserve’s TOP – but the ABSD must be paid first and claimed back later.

The HDB sales proceeds calculator helps you model both scenarios so you can see exactly whether your cash position supports the buy-first route before committing.

How Your HDB Proceeds Map to the Thomson Reserve Payment Structure

Official Thomson Reserve pricing has not been released by the developer and will be confirmed at the October 2026 launch. What you can do now is map your calculator results against the standard new launch payment structure, which applies regardless of the final price:

1. Booking Fee – 5% in Cash

The 5% booking fee is payable in cash when you exercise the Option to Purchase. It cannot be paid from CPF, so it must come from your net cash proceeds or personal savings.

2. Buyer’s Stamp Duty – Cash Upfront

BSD is payable within 14 days of signing the S&P and must be paid in cash first. If you buy before selling your HDB, add 20% ABSD on top – also cash upfront.

3. Balance Downpayment – 20%, CPF Allowed

The remaining 20% downpayment can be funded from your CPF OA refund. For most HDB upgraders, this is where the CPF refund from your flat sale does the heavy lifting.

For pricing context, JadeScape, a comparable large-scale D20 leasehold project near MRT, now trades at S$2,300-S$2,500 psf on the resale market. Register your interest to receive the official Thomson Reserve price list the moment it is released, then feed your net cash and CPF refund into the Affordability Calculator and the Progressive Payment Calculator to map your cash flow across the construction period to estimated TOP 2031.

Use the Affordability Calculator to feed your net cash and CPF refund into a complete budget picture, and the Progressive Payment Calculator to map your cash flow across Thomson Reserve’s construction period to estimated TOP 2031.

This calculator is for general guidance only and does not constitute financial or legal advice. CPF accrued interest calculations are estimates based on the prevailing CPF OA interest rate of 2.5% per annum and may differ from the exact figure computed by CPF Board at the time of your sale. Thomson Reserve pricing has not been released by the developer and will be confirmed at the October 2026 launch. Stamp duty rates are as per IRAS guidelines current at time of publication.