10 Mistakes Investors Make With Rental Assumptions in Phuket
Quick answer: The most common mistake is projecting 12-month occupancy at peak-season rates, which overstates annual income by 30-50%. Realistic gross income assumes 70-78% annual occupancy at blended rates, not December ADR year-round.
The pillar for this cluster is Phuket Property Investment Master Guide 2026.
Mistake 1: Using Peak-Season Rates Year-Round
| Month | Realistic ADR | Occupancy | Monthly Income |
|---|---|---|---|
| December | $220 | 92% | $6,250 |
| January | $200 | 88% | $5,455 |
| February | $190 | 85% | $4,522 |
| March | $170 | 82% | $4,317 |
| April | $150 | 78% | $3,510 |
| May | $110 | 62% | $2,108 |
| June | $95 | 55% | $1,567 |
| July | $105 | 65% | $2,099 |
| August | $100 | 60% | $1,800 |
| September | $90 | 52% | $1,404 |
| October | $120 | 68% | $2,448 |
| November | $155 | 78% | $3,627 |
| TOTAL | $138 blended | 72% blended | $39,107 |
The realistic annual figure of $39,000 is dramatically different from the $72,000 produced by peak-season rate extrapolation, a 46% overestimate.
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Mistake 2: Ignoring Management Fees
- $39,000 gross revenue × 22% management fee = $8,580 deducted
- Remaining: $30,420 before any other costs
This is the second layer of overestimation after the occupancy error. Combined with Mistake 1, an investor projecting $72,000 gross at no management cost is actually looking at approximately $30,000 in pre-cost income, a 58% overestimate.
Mistake 3: Underestimating Maintenance Costs
Common maintenance costs in Phuket condos (annual):
- Air conditioning servicing and parts: $400-$800
- Appliance replacement (refrigerator, washing machine cycle): $300-$600 amortised
- Furniture replacement (5-7 year cycle): $400-$700 amortised
- Plumbing issues (common in tropical climates): $200-$500
- Painting and touch-up (every 2-3 years): $200-$400 amortised
- Electrical issues: $100-$300
- Total realistic annual maintenance: $1,600-$3,300 for condo
Villas have significantly higher maintenance costs: $3,000-$7,000/year due to pool, garden, exterior walls, and roof.
Mistake 4: Forgetting Utility Costs
- Electricity (AC, appliances in unit between stays): $80-$180/month
- Water: $20-$40/month
- Internet and cable: $30-$50/month
- Sinking fund (mandatory maintenance reserve): 500-800 THB/sqm/year
- Total: $1,560-$3,240/year for a typical 1BR condo
Mistake 5: Misunderstanding “Guaranteed Yield” Programs
What guaranteed yields actually mean:
- The developer guarantees income based on the purchase price, not on the property’s actual rental performance
- In most structures, the developer funds the guarantee from the sales margin, not from actual rental revenue
- Post-guarantee period, the property reverts to market-rate income, often disappointing buyers who believed the guarantee would continue
- Some guarantees have clauses reducing payout if the rental pool achieves less than minimum occupancy
The real risk: A developer guaranteeing 7% on a $150,000 unit pays $10,500/year for the guarantee period. If the property actually generates $7,000/year in genuine rental income, the developer is subsidising $3,500/year from their margin. This is unsustainable if the developer faces cash flow problems, and guarantee default is a documented risk in Phuket.
Always ask: “What was the actual audited occupancy and rental income for existing units in this project over the past 3 years?” If the developer cannot provide this data, the guarantee is covering an unknown underlying performance.
Mistake 6: Ignoring The Low Season Completely
- June-September occupancy drops to 45-65% in most areas
- Some properties in poorly located zones close entirely in August-September
- Nightly rates drop 25-35% below annual average in low season
- Shoulder periods (May-October) see occupancy of 60-75%, rates 15-20% below average
An investment calculation that ignores these reductions by 4-5 months of the year can overstate annual income by 20-30%.
Mistake 7: Not Accounting for Tax
As a rough guide, expect 5-15% of net rental income to be subject to Thai withholding tax. Failure to account for this reduces net yield by an additional 0.5-1.5 percentage points. Consult a Thai tax specialist before purchasing, this is not a cost that should be left to post-purchase discovery.
Mistake 8: Ignoring the Cost of Time to First Rental Income
A 7% yield property that takes 18 months to complete effectively delivers 0% for 18 months. Amortised over a 10-year hold, this reduces the effective annual return by approximately 0.6-1% per year. Off-plan purchases in projects with proven developers and fixed completion dates minimise this risk.
Mistake 9: Using Gross Yield to Compare Projects
Comparing gross yields from developer brochures is the investment equivalent of comparing cars only by advertised fuel economy.
Mistake 10: Not Stress-Testing the Model
| Scenario | Occupancy | Blended ADR | Gross Revenue | Net After All Costs |
|---|---|---|---|---|
| Conservative | 62% | -15% below estimate | [calculate] | [calculate] |
| Realistic | 72% | At estimate | [calculate] | [calculate] |
| Optimistic | 82% | +10% above estimate | [calculate] | [calculate] |
If the conservative scenario still produces acceptable returns (or at worst breaks even after mortgage/carrying costs), the investment is defensible. If you need the optimistic scenario to justify the purchase, you are taking unacknowledged risk.
Projected vs Realistic Income: A Direct Comparison
| Metric | Developer Brochure | Year 1 Reality | Year 3 Reality |
|---|---|---|---|
| Annual occupancy | 85-90% | 65-72% | 72-80% |
| Gross yield | 9-10% | 6.5-7.5% | 7.5-9% |
| Net yield (after all costs) | 7-8% | 4-5% | 5-6.5% |
| Management fee shown | 15% | 20-22% | 20-22% |
| Maintenance costs shown | $500/year | $2,500-$4,000 | $2,500-$4,000 |
The trajectory is positive, income ramps as OTA reputation builds and management optimises. But year 1 and year 2 often disappoint investors who expected brochure performance immediately. Patience and a realistic financial model are the most important tools for Phuket rental investment success.
One number to remember
MORE Group shares operator-verified occupancy and ADR ranges during property shortlists, ask for building-level data, not island averages, before you reserve.
Frequently Asked Questions
Projecting peak-season nightly rates across all 12 months. A $200/night December rate applied year-round produces annual income projections 40-50% above what a property actually earns. Realistic blended annual ADR is typically 55-65% of peak-month rates, and annual occupancy is 70-78%, not 85-90%.
They are only as reliable as the developer's financial health. Guaranteed yields are typically funded from sales margin, not from genuine rental performance. Post-guarantee period (usually 2-5 years), income reverts to market performance. Some developers have defaulted on guarantees during financial difficulty. Always verify the developer's track record and financial backing before relying on a guarantee.
After management fees (20-22%), maintenance ($2,500-$4,000/year), utilities ($2,000-$3,000/year), and insurance, a well-located 1BR condo in Bang Tao or Kamala delivers 5-6.5% net yield on purchase price. Some best-in-class projects with top management can achieve 6.5-7.5% net in mature years (year 3-5+).
Build a conservative model: assume 62-65% occupancy, blended daily rate 15-20% below the developer's estimate, management fee of 22%, maintenance costs of $3,000/year, and utilities of $2,500/year. If this model still delivers 3.5%+ net yield after all costs, the investment is defensible. If you need optimistic assumptions to make the numbers work, reconsider.
Yes. Thai withholding tax on rental income applies at rates of 5-15% depending on the structure and your residency status. A Thai tax specialist can advise on the applicable rate for your specific situation and home country tax treaty. Expect 0.5-1.5% reduction in net yield from tax obligations.
Olga
Head of Rentals, MORE Group
Runs the rental side at MORE Group: occupancy and rate data from managed Phuket units, management-company selection, and what an owner actually nets after costs.
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