Second home vs. investment property
Lenders draw a hard line between "second home" (you'll occupy it part of the year, not rented full-time) and "investment property" (rented out). The pricing, down payment, and qualifying standards differ — and lying about which one you're buying is mortgage fraud.
| Primary | Second Home | Investment | |
|---|---|---|---|
| Min. down (conventional) | 3% | 10% | 15–25% |
| Rate premium vs. primary | — | +0.50–0.875% | +0.75–1.5% |
| Reserves required | 2 months | 2–4 months | 6 months on each property |
| Min. distance from primary | n/a | ~50 miles (varies) | n/a |
| Rental allowed? | n/a | Limited (most agencies cap at occasional) | Yes (income can offset payment) |
Down payment options
- 10% down. Standard for second homes; PMI required.
- 20%+ down. No PMI; best pricing.
- HELOC on your primary. Many San Diego buyers tap equity in their primary for the down payment. Check that your DTI absorbs both the HELOC payment and the new second-home PITI.
- Cash-out refi on your primary. Same idea, fixed-rate, but resets your existing mortgage rate.
Qualifying — DTI is the constraint
You'll be qualifying with both housing payments stacked: your primary PITI + the new second-home PITI + all debts. For most San Diego owners with a $4,500/mo first mortgage, adding a $3,800/mo second-home payment requires a six-figure income to stay under 43–45% back-end DTI.
Rental income and the second-home line
Owners increasingly rent second homes part-time. Be careful:
- Most agency second-home loans require you to certify it's NOT primarily a rental. Occasional rental is generally fine; treating it as a year-round Airbnb crosses the line.
- If you intend full-time rental from day 1, finance it as an investment property (higher rate, more down, but you can use rental income to qualify).
- Your homeowners insurance must reflect the use. Standard HO-3 doesn't cover paying guests.
San Diego buyers, common destinations
Among San Diego buyers we see, the most common second-home destinations are Big Bear, Mammoth, Idyllwild, Palm Springs/Coachella Valley, Baja (cash purchases — US lenders don't finance Mexican real estate), and Arizona. Each market has its own seasonal-rental and HOA quirks.
Second homes are lifestyle purchases. If the math only works with rental income, you may actually want an investment property loan — and a different attitude about the property. Decide upfront.