STRATEGY & YIELD
Cash-on-Cash Return: The Only Yield Number That Survives a Loan
When you borrow to buy Tokyo property, cap rate and net yield stop telling the full story. Cash-on-cash return measures what your actual equity earns.
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TL;DR: Cash-on-cash return (CoC) is annual pre-tax cash flow divided by total cash invested. It answers one question: what is my equity actually earning? Net yield and cap rate are asset-level metrics — they ignore financing. The moment you borrow money, your cash return can diverge dramatically from the property’s cap rate, in either direction. For foreign investors who can access Japanese financing, CoC is the return metric that reflects your real-world situation.
A Tokyo property with a 4.2% net yield can generate a 7.8% cash-on-cash return for a leveraged buyer. Same building. Same rent. Same costs. Different return — because cheap leverage amplifies equity returns.
Japanese mortgage rates have been extraordinarily low for a long time. When borrowed money costs 1.5–2.5% and the asset earns 4.2% net, the spread goes to your equity. That’s positive leverage. When borrowed money costs more than the asset earns, CoC drops below cap rate. Right now in Japan, positive leverage is still accessible for most buyers. That won’t last forever. The math turns quickly when it changes.
[OPERATOR NOTE — add your own first-hand detail here: a real deal, number, or scar.]
What Cash-on-Cash Return Actually Measures
CoC = Annual pre-tax cash flow ÷ Total cash invested
Annual pre-tax cash flow = NOI − Annual debt service (principal + interest)
Total cash invested = Down payment + Acquisition costs
This is the after-financing, before-tax income your equity is generating. It’s the number that tells you whether borrowing made sense.
A Worked Example: ¥20M Edogawa 1LDK
Figures below are illustrative — representative deal structure, not a specific property or guaranteed outcome.
Assumptions: ¥95,000/month rent, 10-year-old RC building, financed with 30% down + 70% loan.
Property details:
- Purchase price: ¥20,000,000
- Down payment (30%): ¥6,000,000
- Acquisition costs (6.5%): ¥1,300,000
- Total cash invested: ¥7,300,000
- Loan amount: ¥14,000,000
- Loan terms: 35 years, 2.0% (illustrative; actual terms vary by lender and borrower profile)
- Annual debt service: ~¥560,000 (principal + interest, year 1)
NOI calculation:
| Item | Annual Amount |
|---|---|
| Gross potential rent | ¥1,140,000 |
| Vacancy (8%) | −¥91,200 |
| Effective gross income | ¥1,048,800 |
| PM fee (5.5%) | −¥57,684 |
| HOA fee (¥10,000/month) | −¥120,000 |
| Building repair reserve (¥7,500/month) | −¥90,000 |
| Fixed-asset tax + city planning | −¥90,000 |
| Insurance | −¥18,000 |
| Maintenance | −¥18,000 |
| NOI | ¥554,116 |
Cap rate: ¥554,116 ÷ ¥20,000,000 = 2.77%
Now subtract debt service:
Annual pre-tax cash flow: ¥554,116 − ¥560,000 = −¥5,884
Negative in year 1. Slightly, but negative.
CoC return: −¥5,884 ÷ ¥7,300,000 = −0.08%
Is this a bad deal? Not necessarily. The principal repayment is building equity. In year 1 on a 35-year, 2.0% loan, roughly ¥200,000 goes to principal and ¥280,000 to interest. Economic position:
- Cash flow: −¥5,884
- Principal paid down: ~¥200,000
- Net economic position: slightly positive, just not as cash
By year 5, if rents hold, cash flow turns positive. By year 10, CoC on the original equity invested can be meaningfully positive.
When Positive Leverage Works in Japan
The leverage arbitrage only works when the loan rate is below the cap rate. Let’s rerun with different loan terms to show the sensitivity — all illustrative:
Same property (¥20M, NOI = ¥554,116, cap rate 2.77%)
| Loan Rate | 70% LTV CoC | Comment |
|---|---|---|
| 1.5% | +1.2% | Positive cash flow immediately |
| 2.0% | −0.1% | Near breakeven, principal-building |
| 2.5% | −1.4% | Negative cash flow, harder to justify |
| 3.0% | −2.7% | Clear negative leverage |
At 2.0%, you’re essentially at the tipping point. This is why the direction of Japanese interest rates matters so much to leveraged investors — a 1 percentage point rate increase on a 2.0% loan cuts across the entire cash flow positive/negative threshold.
For foreign buyers, loan access in Japan is already constrained — most major Japanese banks lend only to permanent residents or Japanese nationals. Regional banks, credit union banks (shinkin), and some specialized non-bank lenders do finance foreigners, but typically at higher rates (2.5–4.0%) and lower LTVs (50–70%). At 3.5% on a 2.77% cap rate asset, you have significant negative leverage. CoC is deeply negative. That’s a capital appreciation bet, not an income strategy.
CoC vs. Cap Rate: Which One to Use When
These metrics answer different questions.
Use cap rate when:
- Comparing two assets independently of how you finance them
- Discussing valuation with a seller (financing-neutral)
- Benchmarking against other asset classes
Use CoC when:
- You’re borrowing
- You need to know actual annual cash in/out
- You’re deciding between financing options
- You’re stress-testing whether you can service debt during a vacancy
Both matter. Cap rate tells you asset quality. CoC tells you whether your financing structure makes it viable.
Withholding Tax: The CoC Killer for Non-Residents
Foreign investors who are not Japanese residents face withholding tax on rental income. Under Japan’s tax code, a non-resident landlord’s Japanese-sourced rental income is subject to:
- 20.42% withholding on gross rental income if no tax agent is appointed
- Alternatively, appoint a Japanese tax management agent to file properly, paying income tax at progressive rates on net income
The gross withholding hits CoC hard. On ¥1,048,800 effective gross income, 20.42% withholding = ¥214,165/year off the top. That takes the already-thin cash flow and makes it structurally negative.
The fix: appoint a Japanese tax agent, file properly, and pay tax on net income (after deductions). Your effective tax rate on net income is lower than 20.42% on gross, and you can use costs against income. But this requires a Japanese accountant (zeirishi) familiar with non-resident taxation. Budget ¥50,000–¥150,000/year for this. It shows up in your CoC calculation.
Where This Goes Wrong
- Not modeling debt service changes over time. Some Japanese loans are fixed-rate; many are variable. A 35-year variable rate loan that resets every few years can significantly alter CoC if rates move. Run sensitivity.
- Ignoring principal repayment as equity building. CoC looks bad in early years of a long amortization loan because you’re paying mostly interest. But principal repayment is building asset value. Total return is CoC + equity accumulation + appreciation.
- Not accounting for withholding tax as a non-resident. This alone can turn a marginally positive CoC deal into a cash flow negative.
- Underestimating acquisition cost in the denominator. Some investors put just the down payment in the CoC denominator, forgetting ¥1M+ in acquisition costs. That’s cash out the door. It belongs in the denominator.
- Assuming the same CoC in year 1 as year 10. As the loan amortizes, interest payments fall, principal payments rise (same total outflow), but cash flow improves — CoC gets better over time on a fixed-rate loan with stable rents.
FAQ
Q: What CoC return should I target for Tokyo property? A: For a leveraged deal, even 1–2% positive CoC in year 1 is functional if you believe in capital appreciation. Some investors accept breakeven CoC for the first few years in central wards. If you need cash flow from day one, target 4%+ net yield assets in outer wards and use conservative LTV.
Q: Can foreign buyers actually get Japanese mortgages? A: With restrictions. Japanese banks generally require permanent residency. Some regional banks and credit unions lend to foreigners with long-term visas and established Japan income history. Non-bank lenders will lend to foreigners without residency, but at significantly higher rates. Availability and terms vary significantly.
Q: Is a zero-cash-flow deal in Tokyo worth doing? A: Possibly, if three conditions hold: you believe in long-term Tokyo appreciation, you can fund the cash shortfall without stress, and the principal paydown is building meaningful equity. It’s a total return play, not an income play.
Q: How does CoC change if I use a shorter amortization (e.g., 20 years vs 35 years)? A: Shorter amortization means higher annual debt service, lower CoC in early years, but faster equity building. On the same ¥14M loan at 2.0%: 20-year annual service ≈ ¥848,000 vs. 35-year ≈ ¥560,000. Cash flow is worse early, but you own the asset outright in 20 years.
Q: Should I model CoC before or after Japanese income tax? A: Both, ideally. Before-tax CoC shows operating performance. After-tax CoC shows real return. For a non-resident filing properly on net income, Japanese income tax on rental profits at lower brackets can be 5–20% of net income. Model your specific situation with a zeirishi.