Short answer
Buying before selling comes down to one question: where does the down payment come from before your current home closes? Either you borrow against your equity (bridge loan, HELOC), borrow elsewhere (401(k) loan, buy-before-you-sell program), or restructure the timing so you never need to (sale contingency, rent-back, extended closing).
How to Buy a New Home Before Selling Your Current One
Every way move-up buyers bridge the gap between two closings, compared on equity access, offer strength, double-payment risk, and move timing — plus a decision matrix and a 30-60-90 day plan.
Compare every option
The same five questions asked of all eight paths. Scroll sideways on a phone.
| Option | Equity access | Offer strength | Double-payment risk | Speed to funds | Main risk |
|---|---|---|---|---|---|
| Bridge loan | High — typically sized against your current equity, net of the existing mortgage | Strong. Lets you write a non-contingent offer | High while both homes are held | Weeks, if the lender offers the product | The old home sells slower than the loan term assumes |
| HELOC on the current home | Moderate to high, depending on the approved credit limit | Strong. Cash in hand behaves like a non-contingent offer | High — mortgage, line payment, and the new loan | Must be opened before you list; underwriting takes weeks | Most lenders will not open or fund a line on a listed home |
| 401(k) or retirement loan | Capped by plan rules, independent of home equity | Strong. Funds arrive as cash | High — payroll repayment plus two housing payments | Often the fastest option, days to a couple of weeks | Repayment acceleration if you leave the job |
| Home sale contingency | None up front — you use the actual sale proceeds | Weak in competitive markets; workable in slow ones | Low — you never carry both loans | No extra financing setup needed | Rejected outright, or accepted with a kick-out clause |
| Rent-back (post-occupancy) | Full — the sale closes before you buy | Strongest. You shop with known cash | None — you own one home at a time | Depends on how fast your home sells | Limited length; you may still need interim housing |
| Extended closing | Full, if the sale closes inside the extension | Moderate. Sellers may prefer a faster close | Low if timed correctly | Adds 30 to 60+ days to the purchase timeline | Rate lock expiry and a seller who will not wait |
| Keep the current home as a rental | None, unless paired with a HELOC or cash-out refinance | Depends entirely on qualifying with both mortgages | Ongoing, offset by rent if the unit stays leased | No sale timeline at all | Qualifying with both payments, vacancy, and landlord duties |
| Buy-before-you-sell program | High — the program fronts the equity or buys the home | Strong. Typically produces a cash or non-contingent offer | Varies by program structure | Days to weeks once approved | Program fees and a below-market guaranteed price |
Bridge loan vs HELOC
Both borrow against the home you are leaving. The difference that decides it is usually timing, not price.
Bridge loan
Short-term loan against your current home's equity
A short-term loan secured by your departing home that funds the down payment on the new one and is repaid at the sale.
Best for: Competitive markets where a sale contingency effectively disqualifies your offer and your equity is real but locked up.
Bridge loan availability, rates, origination fees, term length, and qualification standards vary widely by lender and market. Some lenders no longer offer them at all. Get the payoff terms in writing before you rely on one.
HELOC on the current home
Revolving line drawn against existing equity
You open a line of credit against your current home before listing it, draw on it for the down payment, and pay it off from the sale proceeds.
Best for: Homeowners planning far enough ahead to open the line while the home is still off the market, who want cheaper access to equity than a bridge loan.
HELOC rates are commonly variable, draw and repayment periods differ by lender, and many lenders freeze or decline lines on homes that are listed or under contract. Terms, fees, and eligibility vary by lender.
Not sure which of these your lender will actually approve?
Talk through your options401(k) and retirement loans
The one source of down payment funds that does not depend on your home equity at all.
401(k) or retirement loan
Borrowing from your own retirement plan
Your employer plan lends you a portion of your vested balance, repaid through payroll deduction with interest paid back to your own account.
Best for: Buyers who need a modest gap amount quickly and have stable employment through the repayment period.
Plan loans are governed by your specific plan document, not by a universal rule: limits, repayment terms, whether loans are permitted at all, and the consequences of separation from employment vary. Unpaid balances may be treated as a distribution with tax and penalty consequences. Confirm details with your plan administrator and a tax professional.
Want to see how a plan loan changes your qualifying numbers?
Talk through your optionsSale contingency vs a clean offer
The cheapest protection available, and in a competitive market often the reason your offer loses.
Home sale contingency
Purchase conditioned on your current home selling
A contract clause making your purchase conditional on your current home selling (or closing) by a stated date, with a right to cancel if it does not.
Best for: Balanced or slow markets, or when no financing tool is available and you cannot carry two payments.
Whether sellers accept contingent offers, and what a kick-out clause allows, is set by local contract forms, negotiation, and market conditions. Your contract language controls.
Wondering whether contingent offers are being accepted in your target area?
Talk through your optionsRent-back and extended closing
Two ways to change the calendar instead of borrowing money.
Rent-back (post-occupancy)
Sell first, then rent your old home back briefly
Your sale closes and you stay in the home as a tenant of the new owner for a set period at an agreed daily rate, then move once into the new home.
Best for: Sellers in a market where their home moves quickly, buying into a market where they can close within a month or two.
Many lenders limit owner-occupied buyers to a rent-back of about 60 days, and some jurisdictions treat longer stays as a tenancy with tenant protections. Occupancy fees, insurance duties, and any escrow holdback are negotiated in your contract.
Extended closing
Negotiate a longer escrow on the purchase
You negotiate a purchase closing date far enough out that your own sale can close first, funding the purchase without a bridge.
Best for: Motivated or flexible sellers, new construction, and markets where a longer escrow is normal.
Rate lock lengths, extension fees, and seller willingness vary. A longer lock typically costs more, and lock extensions are priced by the lender at the time of request.
Need help lining up two closing dates that actually work?
Talk through your optionsKeeping the current home as a rental
Attractive when you hold a low fixed rate, demanding when you look at qualifying and vacancy.
Keep the current home as a rental
Do not sell — convert it to an income property
You keep the departing home, lease it out, and buy the new home as your primary residence — subject to your lender counting (or not counting) the rental income.
Best for: Owners with a low fixed rate on the old home, solid reserves, and appetite for being a landlord.
Whether a lender counts departing-residence rental income, and what documentation is required (lease, reserves, appraisal rent schedule), varies by loan program and lender. Converting a primary residence to a rental also has insurance and tax implications — confirm with your insurer and a tax professional.
Want to know whether your lender will count the rental income?
Talk through your optionsBuy-before-you-sell programs
You are buying certainty and a single move. The question is what that certainty costs.
Buy-before-you-sell program
A company advances equity or guarantees your sale
A provider buys or guarantees your current home, or advances the equity, so you can make a non-contingent offer and move once.
Best for: Buyers in fast markets who value certainty and one move over squeezing the last dollar out of the sale.
Program fees, guaranteed-price discounts, eligibility limits, and geographic availability differ widely between providers. Compare total program cost against the price you would likely get on the open market.
Comparing a program fee against an open-market sale?
Talk through your optionsWhich option fits you
Answer four questions. The matrix highlights the structures that fit and explains each factor behind the result. It is a starting point for a lender conversation, not a recommendation.
How much usable equity is in your current home?
Could you cover both housing payments for three months?
How competitive is the market you're buying into?
How flexible is your move date?
Best fit: Extended closing
Low double-payment risk- A longer escrow can let the sale fund the purchase with no overlap.
- Sellers here are often willing to negotiate the closing date.
- A flexible move date is what makes a long escrow workable.
Also consider: Rent-back (post-occupancy)
None double-payment risk- Selling first removes the double-payment exposure entirely.
- You can absorb a gap between closings without breaking anything.
Also consider: Bridge loan
High double-payment risk- A bridge can stretch partial equity far enough to cover a down payment.
Get a second read on this from someone who knows your market.
Talk through your options30-60-90 day timeline
Counted backward from the day you want keys to the new home.
- Get a pre-approval that assumes you still own the current home, and ask what happens to it once the old mortgage is gone.
- Ask the lender directly which bridge, HELOC, or departing-residence rental-income options they support — the answer differs by lender.
- Apply for a HELOC now if you want one; most lenders will not open a line once the home is listed.
- Get a listing consultation and a written net-proceeds estimate so you know the real number, not the Zestimate.
- Check your 401(k) plan document for whether loans are permitted, the cap, and the repayment terms on separation.
- Price out two to three buy-before-you-sell programs if your market is competitive.
- Start decluttering and pre-listing repairs — a faster sale reduces every risk on this page.
Common questions
Keep going
Educational information only — not legal, financial, or tax advice, and not an offer of credit or a commitment to lend. Loan availability, rates, fees, qualification standards, retirement plan loan rules, rent-back limits, and contingency acceptance vary by lender, plan, contract, and local market. Confirm every term with your lender, plan administrator, agent, tax professional, and where required a local attorney.