You just rented out your one bedroom condo near BTS Phrom Phong for 25,000 THB per month. The tenant paid on time, you covered the common fees, and everything feels great. Then someone in your LINE group mentions rental income tax, and suddenly you're wondering if you've been doing this wrong the whole time. You're not alone. Most condo owners in Bangkok either don't know about their tax obligations or quietly hope nobody notices. But the Thai Revenue Department does notice, especially as digital payments and bank transfers make income easier to trace. Let's break down what you actually need to know.

How Rental Income Gets Taxed in Thailand

Thailand taxes rental income as assessable income under the Revenue Code. If you own a condo and collect rent, that money needs to be declared in your annual personal income tax return, which is filed using the PND 90 form. The tax year runs from January 1 to December 31, and the filing deadline is typically March 31 of the following year.

Thai personal income tax is progressive, starting at 0% for the first 150,000 THB of net income and climbing up to 35% for income over 5 million THB. Your rental income gets added on top of any salary or business income you already earn, which can push you into a higher bracket.

Here's where it gets interesting. The government allows a standard deduction of 30% on rental income for houses and condos. So if you're collecting 20,000 THB per month from your studio near MRT Phra Ram 9, that's 240,000 THB per year. After the 30% deduction, your taxable rental income drops to 168,000 THB. You can also choose to deduct actual expenses instead, but you'll need receipts for everything, including repairs, management fees, and common area charges. Most owners stick with the 30% flat deduction because it's simpler.

Withholding Tax and What Your Tenant Should Know

If your tenant is a company or a juristic entity, they are legally required to withhold 5% of the rent and remit it to the Revenue Department on your behalf. This is common in Bangkok, where corporate tenants lease condos in buildings like The Lumpini 24 or Ashton Asoke for their employees.

Say a Japanese company rents your two bedroom unit at Siamese Exclusive Sukhumvit 42 for 35,000 THB per month. They will pay you 33,250 THB and send the remaining 1,750 THB to the tax office. You'll receive a withholding tax certificate, and that amount gets credited against your annual tax bill. Keep those certificates. They matter when you file.

If your tenant is an individual, like a freelancer or a retiree, there is no withholding obligation. That doesn't mean you're off the hook for taxes. You still need to declare the income yourself. The difference is just that nobody is automatically deducting anything for you along the way.

Foreign Owners and the Tax Implications

If you're a foreigner who owns a condo in Bangkok and earns rental income from it, you are subject to Thai income tax on that income regardless of whether you live in Thailand or not. The property is in Thailand, the income is generated in Thailand, and the Thai Revenue Department considers it taxable here.

For tax residents, meaning anyone who stays in Thailand 180 days or more in a calendar year, your worldwide income can potentially come into play depending on when funds are remitted. But for rental income specifically, the location of the property is what triggers the obligation.

A common scenario involves a foreign owner with a condo at IDEO Mobi Sukhumvit near BTS On Nut, renting it out for 15,000 THB per month through a local agent. Even if the owner lives in Singapore, that 180,000 THB annual rental income is taxable in Thailand. Many foreign owners appoint a local tax advisor or accountant to handle the filing, which typically costs between 3,000 and 8,000 THB per year.

Common Mistakes Bangkok Condo Owners Make

The biggest mistake is simply not filing at all. Some owners assume that because nobody has contacted them, the income is invisible. With the increasing use of bank transfer records and the Revenue Department's expanding data matching systems, this assumption is getting riskier every year.

Another frequent error is confusing gross rental income with net profit. You might collect 30,000 THB per month from your tenant at Life Asoke Hype near MRT Phetchaburi, but after mortgage payments, common fees, and a property manager's cut, you're barely breaking even. That doesn't matter for tax purposes. The Revenue Department taxes your gross rental income minus the allowed deduction, not your personal cash flow after expenses you choose to take on like loan repayments.

Some owners also forget about the local tax. Section 40 of the Revenue Code covers income tax, but there is also a local maintenance tax and a house and land tax under the 2019 Land and Building Tax Act. For residential properties rented out commercially, this is typically 0.3% of the appraised value. It's a small amount, but ignoring it can create complications.

How to Stay Compliant Without Losing Sleep

First, keep records of every rent payment received. A simple spreadsheet with dates, amounts, and tenant names goes a long way. Second, hold onto all withholding tax certificates if your tenant is a company. Third, file your PND 90 by March 31 each year and include your rental income alongside any other earnings.

If the numbers feel complicated, a local accountant who understands property income can handle everything for a very reasonable fee. Many condo owners in areas like Thonglor, Ari, and Sathorn use small accounting firms that specialize in individual landlords.

Paying your taxes correctly also protects you if you ever want to sell the property, apply for financing, or prove income for visa purposes. Clean records make everything smoother.

Renting out a condo in Bangkok can be a solid income stream, but only if you handle the tax side properly from the start. If you're looking for tenants or trying to understand what your condo could realistically earn in today's market, Superagent at superagent.co uses AI to match your property with qualified renters and gives you real pricing data so you can plan your finances, taxes included.