Rental Property Investing: What to Know Before You Buy Your First Property
Rental property investing has built more wealth for ordinary people than almost any other asset class — but it's not passive income, and the numbers need to make sense before you sign anything.
Photo by Kostiantyn Li on Unsplash
This guide covers the fundamentals: how to evaluate whether a property will actually cash flow, what expenses to budget for, and how to think about financing, tenant screening, and management.
The Core Question: Does It Cash Flow?
Cash flow is what's left over after all expenses are paid. Positive cash flow means the property is profitable month-to-month; negative cash flow means you're subsidizing the property from other income.
Basic formula:
Monthly Cash Flow = Gross Rent - All Expenses
All expenses include:
- Mortgage principal + interest
- Property taxes (budget ~1-1.5% of property value annually)
- Insurance (landlord policy, not homeowner)
- Maintenance and repairs (budget 1-2% of value annually)
- Property management (typically 8-12% of gross rent)
- Vacancy (budget 5-10% of annual rent)
- Capital expenditures (roof, HVAC, water heater — budget 1-2% annually)
Most beginners forget maintenance, vacancy, and capex. When you include them, many "good deals" break even or lose money.
The 1% Rule (and Its Limits)
The 1% rule: a rental property's monthly rent should be at least 1% of the purchase price.
| Purchase Price | Minimum monthly rent (1% rule) |
|---|---|
| $150,000 | $1,500 |
| $250,000 | $2,500 |
| $350,000 | $3,500 |
A property meeting the 1% rule generally cash flows after expenses — but not always. In expensive markets (most coastal cities), properties rarely hit 1%. In the Midwest and South, 1%+ deals still exist.
The rule is a quick filter, not a replacement for actual analysis.
Cash-on-Cash Return
Cash-on-cash return measures your actual cash yield on the money you invested:
Cash-on-Cash = (Annual Cash Flow) / (Total Cash Invested) × 100
Example:
Purchase price: $200,000
Down payment (20%): $40,000
Closing costs: $4,000
Repairs before renting: $6,000
Total cash in: $50,000
Monthly rent: $1,800
Monthly expenses (mortgage + taxes + insurance + reserves): $1,500
Monthly cash flow: $300
Annual cash flow: $3,600
Cash-on-cash return: $3,600 / $50,000 = 7.2%
A 7-10% cash-on-cash return is generally considered good for residential rental property.
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Financing Basics
Investment property loans are different from primary residence mortgages:
| Feature | Primary Home | Investment Property |
|---|---|---|
| Minimum down payment | 3-20% | 15-25% |
| Interest rate premium | Baseline | +0.5-1.5% |
| Reserve requirements | Minimal | 6 months PITI |
| Loan limits | Standard | Standard |
The higher down payment and rate mean your cash-on-cash returns must be higher to justify investment property loans.
Alternative financing:
- House hacking: Buy a multi-family (duplex, triplex) as a primary residence, live in one unit, rent the others. Qualify for owner-occupant rates (3.5% down with FHA, 5% conventional).
- BRRRR strategy: Buy → Rehab → Rent → Refinance → Repeat. Buy distressed, add value, refinance at the new higher value to pull cash out for the next deal.
What Actually Costs Money
Ongoing expenses (annual budget per $100,000 of property value):
| Expense | Annual estimate |
|---|---|
| Maintenance & repairs | $1,000 - $2,000 |
| Property management (10%) | Variable by rent |
| Capital expenditures | $1,000 - $2,000 |
| Property taxes | $1,000 - $2,000 |
| Insurance | $600 - $1,200 |
| Vacancy (7.5%) | Variable |
Capital expenditures (CapEx) to budget for:
| Item | Replacement cost | Useful life |
|---|---|---|
| Roof | $8,000 - $20,000 | 20-30 years |
| HVAC | $4,000 - $8,000 | 15-20 years |
| Water heater | $800 - $1,500 | 10-15 years |
| Appliances | $3,000 - $6,000 | 10-15 years |
| Plumbing | Varies | Ongoing |
Divide by useful life and set money aside monthly. A $15,000 roof that lasts 25 years needs $50/month in reserves.
Tenant Screening
Evictions are expensive ($3,000 - $10,000+) and time-consuming. Good screening prevents most of them:
Standard screening criteria:
- Income: 3x monthly rent in gross income
- Credit score: 650+ minimum (620+ if co-signer)
- Rental history: No evictions, no recent late payments
- Employment: 1+ year at current job (or stable self-employment)
- Background: No violent felonies (consult local fair housing laws)
Use a tenant screening service (RentSpree, Avail, TransUnion SmartMove) to run credit and background checks. Always apply criteria consistently to avoid fair housing violations.
Self-Managing vs. Property Management
| Aspect | Self-manage | Property manager (10%) |
|---|---|---|
| Monthly cost (on $1,500 rent) | $0 | $150 |
| Annual cost | $0 | $1,800 |
| Time required | 4-8 hours/month avg | Near zero |
| Emergency handling | Your phone, 24/7 | Their problem |
| Tenant screening | You | Done for you |
| Worth it at... | 1-2 local properties | 3+ properties, out-of-state, or busy schedule |
For your first property, self-managing teaches you the business. But price it into your analysis — if you hire management later, your cash flow will drop.
Tax Benefits
Rental income is taxable, but real estate has favorable tax treatment:
Depreciation: Residential rental property depreciates over 27.5 years. A $200,000 building (not including land) generates ~$7,270/year in paper depreciation, reducing taxable income — even when the property appreciates in value.
Expenses are deductible: Mortgage interest, property taxes, insurance, repairs, management fees, supplies, travel to the property.
1031 Exchange: Sell one investment property and defer capital gains by rolling proceeds into a new property.
Consult a CPA with real estate experience — real estate taxes are specialized.
Starting Your Search
- Pick a market: Start local (you'll learn more), look for landlord-friendly states (Texas, Indiana, Ohio, Georgia)
- Run numbers before falling in love: Use a spreadsheet or an app like DealCheck or BiggerPockets' rental calculator
- Get pre-approved for financing: Know your budget before making offers
- Inspect everything: Hire a licensed inspector; estimate repair costs before closing
- Plan for 6 months of reserves: First year is always more expensive than expected
Rental property can be an excellent long-term wealth builder — but only when the numbers work. Take the time to analyze deals thoroughly, and skip anything that doesn't cash flow from day one.