TS, it will affect your HDB chances by reducing it to zero.
Resale HDB rules (
URL)
If you or any person listed in your resale flat application owns private residential property (locally or overseas), you may still buy a resale flat without any CPF housing grant or HDB loan but you must dispose of the private property within six months of the purchase of the resale flat.
New HDB from Govt rules (
URL)
You, your spouse, any occupiers listed in the Application Form or their spouses must not own or dispose or have an estate or interest in any other flat, house, building or land*
- Within 30 months before the date of application,
- and between the application date and the date of taking possession of the flat.
* includes but not limited to:
- HUDC flats (Privatised and Non-Privatised)
- Properties acquired by gift
- Properties inherited as beneficiaries under a will or as a result of the Intestate Succession Act
- Private properties
- Properties owned/acquired/disposed through nominees regardless of properties location
If you want to own both HDB and private, you have to buy HDB first, then private.