Cap Rate Explained: What Makes a Good Rental Investment in 2026 (With Real $420K Examples)
A 7% cap rate on a $420K rental means $29,400 net income. Learn how to calculate cap rate, what's good in 2026, and how financing changes everything.
Disclaimer: Tax figures reflect estimated 2026 projections based on IRS Publication 15-T. Tax law changes frequently. Verify with a CPA or the IRS Tax Withholding Estimator. Calcwyse.com is not a tax advisor.
A $420,000 rental producing $29,400 in net operating income has a 7% cap rate. Whether that’s good depends on the market — and most buyers get this backwards.
Cap rate doesn’t measure your actual return. It measures what the property would return if you paid all cash. That distinction matters more than people realize when rates are above 7%. For more on this topic, see our guide: Real Estate ROI: How to Calculate Return on a $420,000 Rental Property in 2026.
What Cap Rate Actually Measures
Cap rate = Net Operating Income ÷ Purchase Price.
NOI is rent minus operating expenses — property taxes, insurance, maintenance, property management, vacancy allowance. Mortgage payments are excluded. Intentionally. Cap rate is a property metric, not a financing metric.
On a $420,000 property:
- Gross annual rent: $36,000 ($3,000/month)
- Operating expenses (35% estimate): –$12,600
- NOI: $23,400
- Cap rate: 5.6%
Push gross rent to $3,500/month and the math shifts:
- Gross annual rent: $42,000
- Operating expenses (35%): –$14,700
- NOI: $27,300
- Cap rate: 6.5%
The 35% expense ratio is standard for single-family rentals without a mortgage. Add debt service and your cash-on-cash return diverges — often sharply — from cap rate. They’re not the same number.
📊 $420,000 Rental Property — Cap Rate Scenarios (2026)
Monthly Rent Annual NOI Cap Rate Classification $2,500 $19,500 4.6% Appreciation play $3,000 $23,400 5.6% Moderate $3,500 $27,300 6.5% Solid cash flow $4,000 $31,200 7.4% Strong cash flow $4,500 $35,100 8.4% High yield / higher risk Assumes 35% expense ratio. Single-family rental. Excludes debt service. Estimated.
Quick math: 5.6% cap rate on $420,000 → $23,400 NOI/year — $1,950/month or $900 bi-weekly. Estimated · 35% expense ratio · excludes mortgage · single-family rental.
What’s a Good Cap Rate in 2026?
No universal answer. But there’s a framework.
Below 4%. You’re paying for appreciation, not income. Common in San Francisco, Boston, coastal NYC. Cash flow is minimal or negative from day one. These deals work if values rise. They don’t if they stall.
4%–6%. The middle ground. Secondary cities, suburban metros. Some cash flow, moderate appreciation potential. Most of the country sits here.
6%–8%. Income-focused returns. Cleveland, Indianapolis, Kansas City, parts of the Sun Belt. You’re buying cash flow. Appreciation may be slower.
Above 8%. High yield. Often signals higher vacancy risk, deferred maintenance, or a rougher submarket. Not automatically bad — but requires harder due diligence.
Most buyers don’t realize the cap rate on a listing uses pro forma rents, not actual collected rents. That gap runs $200–$400/month and swings the cap rate by a full percentage point.
Estimated cap rates by market type — 2026:
- 🟢 Cleveland, OH — 7%–10% (cash flow market, slower appreciation)
- 🟢 Indianapolis, IN — 6%–9%
- 🟢 Memphis, TN — 7%–10%
- 🟡 Atlanta, GA — 5%–7%
- 🟡 Phoenix, AZ — 4.5%–6.5%
- 🔴 Los Angeles, CA — 3%–4.5%
Source: Freddie Mac PMMS + local MLS data; ranges reflect single-family residential.
Cap Rate vs. Cash-on-Cash: The $420K Example
Cap rate ignores financing. Cash-on-cash doesn’t.
Say you put 25% down on a $420,000 property — $105,000 down, $315,000 financed at 7.1% over 30 years. Monthly PITI runs roughly $2,550.
That same property at $3,000/month rent, $23,400 NOI (5.6% cap rate):
- Annual NOI: $23,400
- Annual debt service: $30,600
- Annual cash flow: –$7,200
Negative. On a 5.6% cap rate. That’s leverage in a 7%+ rate environment. Cap rate looked fine. Cash-on-cash comes out at –6.9% on your $105,000 down payment.
Now run it at a 7.4% cap rate ($4,000/month rent, same property):
- Annual NOI: $31,200
- Annual debt service: $30,600
- Annual cash flow: +$600
Barely positive. You need roughly 8% to break even on cash flow with 25% down at current rates.
If you’re comparing properties with a DSCR pre-approval in hand, run both numbers — not just cap rate.
Cap Rate and the 2026 Rate Environment
In 2020–2021, 30-year rates sat near 3%. A 5% cap rate produced healthy cash-on-cash returns. At 7%+, that same property runs negative.
Cap rate compression happened in most markets from 2019 to 2022. Buyers paid more, pushing cap rates down. Now, with higher borrowing costs, buyers need higher cap rates to make deals work. That pressure is slowly pushing prices down in high-cap-rate markets and stalling appreciation in low-cap-rate ones.
The Bureau of Labor Statistics tracks rental price trends by metro — worth checking before assuming current rent comps hold for your underwriting period.
Monthly Budget — Sample Indianapolis Rental at 7% Cap Rate
Say you buy a 3-bedroom in Broad Ripple, Indianapolis for $420,000. Gross rent: $3,200/month (~$38,400/year per Zillow, May 2026). At a 35% expense ratio, NOI = $24,960. Cap rate: 5.9%.
After debt service at current rates, cash flow is tight. But here’s what the operating picture looks like before financing:
🏙️ Monthly Operating Budget — Indianapolis, IN · $3,200/mo gross rent
Expense Est. monthly Source Property taxes (Marion County) $420 County assessor Insurance (State Farm landlord policy) $110 State Farm quote Maintenance reserve (1.5% of value/yr) $525 Standard industry estimate Property management (9% of rent) $288 Local PM firms Vacancy allowance (5%) $160 Bureau of Labor Statistics Utilities (landlord-paid — water) $65 BLS CES Total operating expenses $1,568 NOI $1,632 Estimates for a single-family rental, non-owner-occupied. Rent burden on a tenant at $3,200 vs. $6,500 median Indianapolis household income: 49% — above the 30% affordability threshold. Rent burden: 49% of typical renter take-home.
That’s $1,568/month in expenses on $3,200 rent — a 49% expense ratio, higher than the 35% rule of thumb once management and reserves are included. The 35% figure works for rough screening. Full underwriting requires line-item detail.
Quick Answers About Cap Rates and Rental Property
What cap rate should I target on a $420K property in 2026? At current mortgage rates above 7%, you need at least a 7%–8% cap rate to approach break-even cash flow with 25% down. Below 6%, expect negative cash flow unless you put more down.
Does cap rate include mortgage payments? No. Cap rate is calculated before debt service. It’s a property-level metric. Cash-on-cash return accounts for your actual financing — that’s the number that shows what you’re earning on invested cash.
What’s a realistic NOI expense ratio for a single-family rental? 30%–40% for long-term rentals without a mortgage. Add professional management at 8%–10% of gross rent and you hit the high end. Short-term rentals often run 45%–55% due to cleaning, supplies, and platform fees.
Is cap rate the same as ROI? No. Total return includes appreciation, principal paydown, and depreciation benefits. Cap rate measures only operating income relative to purchase price — one component of the full return picture.
Can cap rate change after I buy? Yes. If rents rise, NOI rises and your effective cap rate on original purchase price improves. If vacancy spikes or expenses increase, it drops. Cap rate at purchase is a snapshot, not a guarantee.
Three Moves That Add Real Dollars to a $420K Deal
1. Force rent to market. Adding $200/month in rent on a $420K property adds $1,680/year to NOI. At a 6% market cap rate, that implies $28,000 in added property value. Small rent adjustments compound in both directions. For more on this topic, see our guide: $50/Month for 10 Years at 5%: The Exact Final Value (And What Changes It).
2. Cut vacancy with longer leases. A 5% vacancy allowance on $3,200/month costs $1,920/year. A tenant on a 2-year lease at a slight discount eliminates most of that. Net gain: $1,000–$1,500/year on most deals.
3. Self-manage selectively. Professional management at 9% of $3,200/month = $3,456/year. That’s 0.82% of purchase price — enough to swing a marginal deal into positive territory. Not right for everyone, but the math is real.
💡 $420K Rental — NOI Impact of Key Variables
Scenario Annual NOI Cap Rate vs. Baseline Baseline ($3,000/mo, 35% expenses) $23,400 5.6% — +$200/mo rent ($3,200/mo) $24,960 5.9% +$1,560 –Property mgmt (self-manage) $26,640 6.3% +$3,240 Higher rent + self-manage $28,200 6.7% +$4,800 Reduce vacancy to 3% $24,120 5.7% +$720 NOI = gross rent minus operating expenses, pre-debt service. Estimates only. IRS Notice 2024-80 · IRS Rev. Proc. 2025-19
Check Your Exact Scenario
Cap rate is the starting point, not the finish line. Run NOI, debt service, cash-on-cash, and projected appreciation before you commit.