Sell your principal residence, put the proceeds into a new one, and the 6% capital gains tax can fall away entirely. There are four conditions and one of them expires thirty days after the sale.
The old home, and the new one
And whether you still qualify
All of them, or the relief is lost
| Condition | What it actually requires |
|---|---|
| It is your principal residence | The home you actually live in, as borne out by your address on record with the BIR and on your identification. A second home, a unit you let out, or a property held for investment does not qualify however long you have owned it. |
| Tell the BIR within 30 days | A sworn declaration of intent to avail, filed with the return within thirty days of the sale. This is the one people lose the relief on, because the other conditions feel far away and this one does not. |
| Use the proceeds within 18 months | Acquiring or building a new principal residence. Partial use is allowed and taxed pro rata — it is not all or nothing. |
| Once every ten years | Counted from the earlier sale on which you claimed it. Selling twice in eight years means the relief is only available on one of them, so it is worth using it on the larger gain. |
Capital gains tax here is not a tax on the gain. It is 6% of the gross selling price or the fair market value, whichever is higher, and it is due whether or not you made money on the sale. Selling at a loss does not reduce it. That is what makes this relief valuable, and it is also why the historical cost of the old home matters — it carries over to the new one and is what the sale after this one gets measured against.
The rest of a sale's costs — documentary stamp tax, transfer tax, registration fees and the broker's commission — are on the closing fees calculator, and the filing deadlines and late penalties are on the BIR deadlines calculator.