Converting Your Home to a Rental While Buying Your Next Home in Washington State

One of the most common scenarios I work through with move-up buyers in Washington State is this: you want to buy your next home, but you’re considering keeping your current home as a rental rather than selling it. Maybe you’ve built significant equity and don’t want to give it up. Maybe the rental income would help offset your new mortgage payment. Maybe you simply love the neighborhood and want to hold onto the property long-term.

Whatever the reason, converting your existing home to a rental while buying a new one is entirely doable — but the mortgage guidelines are more complex than most buyers expect. The rules differ significantly depending on which loan program you’re using for the new home, how much equity you have in the departure property, and whether you have a signed lease in hand.

Here’s what you need to know.

The Core Challenge: Qualifying for Two Mortgages

When you buy a new home while keeping your existing one, your lender needs to qualify you for both mortgage payments simultaneously. Even if a tenant will be paying rent on the departure property, that rental income may or may not be usable for qualifying depending on the program — and in some cases, the full existing mortgage payment must be counted as a liability even if rental income is covering it.

This is why talking to your loan officer before you start house hunting is critical. The decision to keep or sell your existing home can dramatically change what you qualify for on the new one.

Program-by-Program Guidelines

Conventional — Fannie Mae

Fannie Mae offers the most flexibility for borrowers converting a primary residence to a rental:

• The borrower must qualify for both mortgage payments — the new home and the departure property
• Rental income from the departure property can be used to offset the mortgage payment if a signed lease agreement is in place for a minimum of 12 months
• If a signed lease is not available, the full departure property mortgage payment must be counted as a liability
• Reserves are required — the number of months required depends on how many financed properties the borrower owns. With one to four financed properties, Fannie Mae typically requires two months reserves on each property. With five or more financed properties, requirements increase
• There is no minimum equity requirement in the departure property under standard Fannie Mae guidelines

Conventional — Freddie Mac

Freddie Mac guidelines are similar to Fannie Mae with some differences:

• Borrower must qualify for both mortgage payments
• Rental income from the departure property can be used with a signed lease in place
• Reserve requirements are determined by Freddie Mac’s automated underwriting system — findings vary by scenario
• No minimum equity requirement in the departure property under standard guidelines

FHA

FHA has more restrictive guidelines for this scenario than conventional — which is a reversal from how most people think about FHA vs conventional flexibility:

• Rental income from the departure property can only be used to offset the mortgage payment if the borrower is relocating due to employment and the new home is more than 100 miles from the current primary residence
• If the relocation requirement is not met, the full departure property mortgage payment must be counted as a liability and rental income cannot be used
• The departure property must have at least 25% equity — verified by appraisal or automated valuation — for the rental income offset to be allowed
• This makes FHA a less favorable option for most buyers who want to convert their home to a rental while buying locally

VA

VA guidelines have their own specific rules for this scenario:

• Borrower must qualify for both mortgage payments
• Rental income from the departure property may only be used to offset the departure property’s mortgage payment — it cannot be treated as positive income that reduces your DTI beyond zeroing out that payment
• The existing mortgage on the departure property cannot be a VA loan — if you currently have a VA mortgage and want to keep the property, this creates a complication worth discussing with your loan officer
• Three months of mortgage payments (PITI) are required as reserves
• Exception: if the borrower has a documented two-year history of managing investment properties, the full rental income may be used as qualifying income

USDA

USDA loans are not an option for this scenario. USDA only permits borrowers to own one property, so if you’re retaining your current home you would not be eligible for USDA financing on the new purchase.

Quick Reference: Departure Property Rental Income by Program

The Signed Lease Question

One of the most practical issues buyers run into is timing. To use rental income under conventional guidelines, you typically need a signed lease in place — but many buyers haven’t found a tenant yet when they’re applying for a mortgage on the new home.

If you don’t have a signed lease, the full departure property mortgage payment will be counted against your DTI. Depending on your income and the size of the payment, this may or may not affect your qualifying position on the new home.

A few practical points on leases:

• The lease should be for at least 12 months
• The lender will review the lease for the rental amount, start date, and signatures from both parties
• The rental income used for qualifying is typically 75% of the gross rent — the 25% reduction accounts for vacancy and maintenance expenses
• If your rental income after the 75% reduction exceeds your departure property mortgage payment, the excess cannot generally be used as positive qualifying income unless you have a two-year history of managing rental properties documented on your tax returns

Reserves: What You Need to Have in the Bank

Reserve requirements are one of the most commonly overlooked aspects of this scenario. Lenders want to see that you have enough liquid assets to cover several months of mortgage payments on all financed properties — not just the new one.

For conventional financing with multiple financed properties, Fannie Mae generally requires:

• Primary residence: typically two months PITI
• Each additional financed property: typically two months PITI per property

This means if you’re buying a new home and keeping one rental, you may need four to six months of combined payments in verifiable liquid assets after closing. This is separate from your down payment and closing costs.

Acceptable reserve sources include checking and savings accounts, vested retirement accounts (at 60-70% of value), and investment accounts. Gift funds cannot typically be used for reserves.

What About the Occupancy Question?

When you buy a new home intending to live in it as your primary residence, you are certifying on the loan documents that you will occupy the property within 60 days of closing. This is standard and straightforward.

What’s important to understand is that your existing home’s occupancy status also matters. If you originally purchased it as a primary residence, converting it to a rental is generally permitted — but the timing and documentation matter. Your lender will review whether your situation genuinely supports the conversion rather than flagging it as potential occupancy fraud.

Signs that support a legitimate conversion include having a signed lease, a clear reason for the move (upgrading to a larger home, relocating within the area, family needs), and documentation consistent with someone who is genuinely moving.

Should You Keep the Home or Sell It?

This is ultimately a financial and lifestyle decision — but the mortgage implications are worth factoring in. A few questions worth working through:

• Can you qualify for the new home while carrying the existing mortgage? If keeping the property makes qualifying difficult, selling may be the cleaner path — especially if proceeds from the sale would strengthen your down payment and reserve position on the new home.
• Will the rental income cover the full mortgage payment? If the rent doesn’t cover principal, interest, taxes, insurance, and maintenance, you’re subsidizing the rental — which may or may not be worth it depending on your long-term equity goals.
• Have you considered a bridge loan? If you need the equity from your current home to buy the next one but want to keep the option of renting it open, a bridge loan may allow you to access that equity before selling — giving you time to decide whether to sell or retain the property.