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How to Buy a Bigger Home Without Selling Your Current One

April 9, 2026·9 min read·Buying a Home

Life changes — growing families, new jobs, bigger dreams. Many homeowners eventually want to move up to a larger home but don't want to sell the one they have. The good news: if you can rent out your current home, that rental income can count toward your qualifying income, making it possible to carry both mortgages. Here's exactly how it works.

The Core Concept: Rental Income as Qualifying Income

When you convert your current home to a rental property and buy a new primary residence, lenders can use the projected rental income to offset — or even eliminate — the financial burden of the departing residence. The key is knowing how lenders calculate this, what documentation they need, and what reserve requirements apply.

Step 1 — Run the Numbers: Can Your Income Support Both Properties?

Lenders still use DTI (Debt-to-Income Ratio) as the primary qualifying standard. The basic formula:

All monthly debt payments ÷ Gross monthly income ≤ 45%
(Fannie Mae allows up to 50% DTI with compensating factors such as strong reserves or high credit score)

Monthly debts include: both mortgage payments (PITIA) + car loans + student loans + minimum credit card payments

So how does rental income from the departing home affect this equation? Lenders apply a 75% rental income factor (to account for vacancy and maintenance), then compare it against the departing home's mortgage payment:

+If (Rental income × 75%) > Departing home PITIA → the net positive cash flow is added to your income (denominator)
−If (Rental income × 75%) < Departing home PITIA → the net negative cash flow is added to your debts (numerator)
Example

Example: Current home PITIA = $2,500/mo. Rental income = $3,200/mo. Net = $3,200 × 75% − $2,500 = $2,400 − $2,500 = −$100 → adds $100 to debt side. Or: Rental = $4,000 → $4,000 × 75% − $2,500 = $500 → adds $500 to income side.

Step 2 — Find a Tenant (Before You Close on the New Home)

You don't need the tenant already moved in. Lenders just need to see:

  • A signed Lease Agreement for the departing residence
  • Evidence the tenant has paid a security deposit
💡 Pro tip: Run your numbers with a Tiger Loans mortgage professional before you start searching for tenants. You need to know your maximum purchase price for the new home and how much rent you need to make the numbers work — before committing to a lease.

Step 3 — Get an Appraisal on the Departing Residence

To use rental income from your current home, Fannie Mae/Freddie Mac require that the departing home's remaining loan balance be no more than 70% of its current appraised value (LTV ≤ 70%). This protects against scenarios where the owner has no equity cushion.

Example

Example: You bought your home for $800,000 with a $640,000 loan. The home has appreciated to $950,000 and your balance is now $580,000. LTV = $580,000 ÷ $950,000 = 61% ✓

If your LTV is above 70%, you would need to pay down the balance or the rental income cannot be used for qualification.

Step 4 — Required Documentation

  • Signed Lease Agreement for the departing residence
  • Copy of tenant's security deposit check or bank transfer
  • Appraisal Report on the departing residence (establishing current market value)

Step 5 — Reserve Requirements

This is the step many buyers overlook. When using rental income from a departing residence, lenders require asset reserves in addition to your down payment and closing costs. The standard requirement:

2 months of PITIA for BOTH properties (departing home + new home)

These funds must be documented in your accounts but do not need to be spent — they just need to be there. Eligible assets include:

  • Checking / savings accounts (cash — counted at 100%)
  • Stocks and investment accounts (discounted by 30% — only 70% counts)
  • Retirement accounts — 401(k), IRA (discounted by 40% — only 60% counts)
Example

Example: Departing home PITIA = $2,500/mo. New home PITIA = $3,800/mo. Required reserves = ($2,500 + $3,800) × 2 = $12,600 in verified assets. If you hold $20,000 in a 401(k), the lender counts $20,000 × 60% = $12,000 toward reserves.

Quick Checklist

  • →Current home rental income can offset or replace its mortgage payment in your DTI calculation
  • →Rental income is counted at 75% (vacancy/maintenance haircut)
  • →Departing home LTV must be ≤ 70% to use rental income for qualification
  • →Need: signed lease + security deposit proof + appraisal on departing home
  • →Reserves required: 2 months PITIA × 2 properties (beyond down payment and closing costs)
  • →Cash counts 100%; stocks count 70%; retirement accounts count 60%

Want to Know If You Can Afford to Upsize?

A Tiger Loans mortgage professional can run the numbers for your specific situation — including rental income, reserves, and maximum purchase price for your new home.

Talk to a Loan Officer

*Guidelines are based on Fannie Mae/Freddie Mac standard conforming loan requirements. Specific loan programs, lender overlays, and individual borrower circumstances may vary. Contact Tiger Loans, Inc. NMLS #1169300 for a personalized analysis.