The annual tax is set by how the land is used, not by value alone. Land left vacant is taxed at the highest rate, and the rate climbs every three years.
The Land and Building Tax Act of 2019 changed how Thailand taxes property annually. The rate follows how the land is used, not value alone — which bears directly on anyone buying land to hold.
Agricultural — the lowest rates. Individuals receive an exemption on the first tranche of value.
Residential — low rates. A principal home where the owner's name is on the house registration receives a substantial exemption.
Other (commercial) — several times the residential rate.
Vacant or unused land — the highest rate, and it rises every three years the land stays unused, up to a statutory ceiling.
Buying vacant land and holding it for appreciation carries a holding cost that increases over time rather than staying flat.
This is why many owners plant bananas, limes or coconuts on land they are not yet using: it brings the plot into the agricultural category, which is taxed far more lightly.
The practice is lawful, but there are minimum planting densities per rai by crop, set by the Ministry of Agriculture. Planting below the threshold may not qualify.
The local administration — the municipality or sub-district authority where the land sits — not the Revenue Department.
They issue an assessment notice with an annual payment deadline. Late payment attracts penalties and surcharges.
Is any tax outstanding? Unpaid tax attaches to the land, not to the former owner personally. A buyer who does not check can inherit it.
Ask the seller for the most recent tax receipt, and confirm with the local office that nothing is outstanding.
How is the land currently classified? If it is treated as agricultural because the previous owner planted it, and the buyer intends to leave it vacant, the rate changes category entirely.
If you are buying land to build on in a few years, put the annual tax for that whole period into the financial plan from the start.
On a high-value plot, the vacant-land rate compounded over several years is not a trivial sum. It is part of why some owners decide to sell sooner than they first intended.
Waterfront land carries building restrictions ordinary land does not: setbacks from the water, Marine Department permits, and zoning. What to establish before paying for a design.
Two riverside plots of identical area can be worth very different amounts, because of how much of each touches the water. Why that is, and how to compare them properly.
A single plot carries at least two prices. The Land Department's assessed value sets the taxes; the market price is what it changes hands for. Knowing which is which keeps the sums right.
