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Investment Properties Guide — Mortgex
Pillar Guide 18-minute read No fluff, just math

Investment Properties:
the complete, no-BS playbook

From “what should I buy?” to “how do I finance it and not get wrecked?”—use this blueprint to analyze, fund, and operate rentals like a pro. We’ll cover loan programs (DSCR, conventional, bank statement), the cash-flow math, taxes, risk controls, and step-by-step deal workflows.

Target DSCR
≥ 1.20× (safe ≥ 1.25×)
Conventional LTV (non-owner)
Up to 80%
Cash reserve rule of thumb
6–12 months PITI

1) Property types & where each wins

“Best” depends on your market, risk tolerance, and whether you optimize for cash flow now or equity later. Here’s the quick landscape.

Single-family rentals (SFR)

  • Low tenant turnover; easier to finance; strong resale pool.
  • Often lower cap rates than small multi-family in hot metros.
  • Good for appreciation + long-term debt paydown.

2–4 units (duplex/tri/quad)

  • Better income density; vacancy risk spread over units.
  • Still residential financing; more competitive cap rates.
  • Great bridge from SFR to larger scale.

5+ units (small apartment)

  • Commercial financing; NOI-driven valuation (force appreciation).
  • Requires stronger ops; lenders scrutinize DSCR & experience.
  • Cap-ex planning and professional management recommended.

Short-term rentals (STR)

  • High gross potential but volatile occupancy and regulation risk.
  • Heavy management; cleaning & dynamic pricing critical.
  • Check local ordinances and seasonality before underwriting.

2) Financing programs compared

Program Use case Typical LTV Underwriting focus Notes
Conventional (non-owner) SFR / 2–4 units, W-2 borrowers Up to 80% Borrower DTI, credit, reserves Best pricing; rental income can offset.
DSCR loans SFR/2–4u/5+u; investor-friendly 75–80% (varies by DSCR) Property cash flow (DSCR ≥ 1.0–1.25×) Fast, easier on income docs; rate premium.
Bank-statement / Non-QM Self-employed / irregular income 70–85% 12–24mo deposits, reserves Flexible docs; higher fees/rates.
Bridge / Fix-&-Flip (LTC) Value-add, BRRRR Up to ~85% LTC ARV, scope, experience Short term; exit via DSCR/conventional.
Portfolio / Credit Union Multiple props / nuanced files Case-by-case Global cash flow + relationship Negotiable terms; local focus.

DSCR (Debt-Service Coverage Ratio) = Net Rent / PITIA. Lenders vary, but a common floor is 1.0–1.25×. Higher DSCR generally unlocks better pricing and/or LTV.

3) The math that actually matters

Key formulas

  • NOI = Gross Scheduled Rent − Vacancy − Operating Expenses (excludes debt)
  • Cap Rate = NOI ÷ Purchase Price
  • Cash-on-Cash = (Annual Cash Flow ÷ Cash Invested)
  • DSCR = Net Rent (or NOI proxy) ÷ PITIA

Expense assumptions (starting points)

  • Vacancy: 5–8% long-term; 10–15% value-add or STR seasonality
  • Repairs/Cap-Ex: 8–12% (older props toward the high end)
  • Property Management: 8–10% (STRs higher due to turnover)
  • Insurance + Taxes: pull actual quotes; stress +10–20% YoY

Worked example (SFR)

Purchase $320,000; rent $2,450/mo. Taxes $3,800/yr; insurance $1,600/yr; mgmt 8%; vacancy 6%; repairs/cap-ex 10%. 20% down, rate 6.75%, 30-yr.

Gross Rent
$29,400/yr
Vacancy (6%)
−$1,764
Mgmt (8%)
−$2,352
Repairs/Cap-Ex (10%)
−$2,940
Taxes + Insurance
−$5,400
NOI (pre-debt)
$14,944
With ~6.75% @ 80% LTV, P&I ≈ $1,663/mo; add taxes+ins escrows ≈ $450/mo → PITIA ≈ $2,113/mo ($25,356/yr). DSCR ≈ $29,400 × (1 − 6% vacancy) ÷ $25,356 ≈ 1.10× (tight). Improve by better price, higher rent, or larger down payment.

4) Strategy stacks that actually scale

BRRRR (Buy-Rehab-Rent-Refi-Repeat)

  • Buy undervalue; force appreciation via rehab.
  • Stabilize at market rent; refi into DSCR or conventional.
  • Risks: ARV miss, rehab overruns, rate shift before refi.

Turnkey Cash-Flow

  • Buy stabilized assets; lower headache, lower yield.
  • Focus on boring markets with stable job bases.
  • Win with buy box discipline + volume over time.

Value-Add Small Multi

  • Under-market rents, minor renos, utility bill-back (RUBS).
  • NOI growth drives valuation; refinance or sell.
  • Mind tenant laws, notice periods, permit rules.

5) Taxes: the levers that move your real return

Depreciation

Residential (27.5 yrs) and cost-segregation accelerate deductions (engineer study).

  • Passive losses may be limited; track carryforwards.
  • “Real estate professional” status changes limits (ask CPA).

1031 Exchanges

Defer capital gains by exchanging into “like-kind” property via a qualified intermediary.

  • 45-day ID window; 180-day close window. Plan ahead.
  • Match or increase debt + value to fully defer.

Taxes are nuanced and change often. Use this as a map, not legal advice—coordinate with a CPA who knows landlords and investors.

6) Risk controls you’ll wish you set sooner

Before you buy

  • Stress test at +1%–2% interest rate, −5% rent, +15% expenses.
  • Order sewer scope, roof & foundation inspections on older stock.
  • Budget initial cap-ex (water heater/HVAC/roof reserve).

After you buy

  • Maintain 6–12 months of PITIA reserves per property.
  • LLC + umbrella + proper landlord insurance endorsements.
  • Written tenant criteria; document everything.

7) Operations: finding the margin

Tenant funnel

  • Pro photos, floor plan, screening criteria visible upfront.
  • Pre-screen with income & credit bands; fair-housing compliant.
  • Automate showings & applications.

Expense discipline

  • Annual tax appeal; insurance re-shop; utility audits.
  • Preventive maintenance calendar; vendor rate card.
  • Track KPI: ΔNOI/unit, turn time, delinquency rate.

STR-specific

  • Dynamic pricing; minimum stay rules; occupancy pacing.
  • Hotel-grade cleaning SOP + photo checklist.
  • Noise sensors + neighbor messaging plan.

8) Deal playbook (checklist)

  1. Define your buy box: metro, property type, price range, DSCR target, rehab tolerance.
  2. Get pre-qualified: conventional vs DSCR vs non-QM; confirm reserves and LTV.
  3. Build pipeline: MLS alerts + agent + wholesalers + on-market “stales”.
  4. Underwrite fast: rent comps, expense model, stress tests, walk-through.
  5. Offer with outs: inspection & financing contingencies where possible.
  6. Diligence: inspections (incl. sewer), insurance quotes, permit history, lease review.
  7. Close & stabilize: immediate safety/cap-ex, marketing, tenant criteria, automation.
  8. Refi/scale: document NOI improvements, shop lenders, rinse and repeat.

Want a side-by-side DSCR vs Conventional quote on the same deal? Get a 2-minute pre-quote—no hard pull—then pick the cheaper lifetime cost.

9) FAQs

Compare DSCR vs Conventional on Your Deal

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