Direct answer
You don't have to wait. A conforming loan can use Fannie Mae's delayed financing any time within six months of closing, capped at $1,249,125 in 2026. To deduct the interest as acquisition debt, take the loan out by day 90; federally, the deduction covers $750,000 of principal. At $6 million, a jumbo lender's written terms decide the rest.
Two clocks are running, and they have to be read separately. The tax clock is 90 days. IRS Publication 936 says that if you buy your home within 90 days before or after the date you take out a mortgage secured by it, that loan can be treated as home acquisition debt even if the proceeds go into investments, up to the cost of the home. Federally, interest is deductible on up to $750,000 of that principal; California figures it on up to $1 million of acquisition debt. Borrow after day 90, with the money not going to build or substantially improve the home, and the federal mortgage interest deduction no longer applies.
The lending clock is six months. Fannie Mae's delayed financing exception lets an all-cash buyer take a cash-out within six months of purchase, for no more than the documented cash invested plus the new loan's costs. But Fannie Mae buys only loans within the conforming limit, and in 2026 the one-unit limit in both Santa Clara and San Mateo counties is $1,249,125 — about 21% of a $6 million price.
So at the $6 million level, what you can actually borrow back is set by a jumbo lender's own terms. Get those terms in writing before you write the offer.
Who this article is for
- U.S. tax-resident families with enough cash or liquid assets to write an all-cash offer above $5 million in Palo Alto, Los Altos, or Atherton, who plan to borrow part of it back after closing to restore liquidity
- Buyers who have already closed all-cash, are still inside the 90-day or six-month window, and want to know what borrowing now means for loan size, rate, and the interest deduction
- Families who haven't yet decided whether to take title individually, in a revocable trust, or through an LLC, and want to know first whether that choice affects a loan later
This article covers an owner-occupied main home, with a borrower who is a U.S. tax resident. If you have no U.S. credit history and your income is earned abroad, the loan path is covered in I have no U.S. credit history and no U.S. income documents — can I still get a mortgage on a $5M+ Bay Area home? If you plan to finance at purchase and compete head-on with cash buyers, see how a financed buyer competes with all-cash buyers in the Bay Area.
Three things that decide it
Borrowing after an all-cash purchase comes down to three questions, in order. Does the interest count as acquisition-debt interest? Which kind of lender will make the loan, and under what rules? And which ceilings combine to set the number that is finally approved? The first turns on day 90. The second turns on month six, and on whether your loan amount sits above the conforming limit. The third turns on how much cash you paid, what the home appraises for, and whose name is on title.
One: the tax clock — day 90
IRS Publication 936 (2025 edition) has a section titled "Mortgage treated as used to buy, build, or substantially improve home." It lists situations in which a loan secured by a qualified home counts as acquisition debt even when the money was not actually spent buying, building, or substantially improving it. The first reads: "You buy your home within 90 days before or after the date you take out the mortgage." The acquisition debt is limited to the home's cost, plus qualifying substantial improvements.
Example 1 in the publication is exactly this sequence: an all-cash purchase, then a loan. On June 3, a homeowner uses cash from the sale of a previous home to buy a $175,000 main home. On July 15, they take out a $150,000 loan secured by the new home and use it to buy stock. Because the home was bought within 90 days before the loan, and the loan did not exceed the home's cost, the entire loan counts as home acquisition debt.
When is a mortgage "taken out"? The publication's "Date of the mortgage" paragraph answers that as well. Generally it is the day the loan proceeds are disbursed, which is usually the loan's closing date. You can instead treat the day you apply in writing as the date you take it out, but only if the proceeds arrive within a reasonable time after approval; the publication's example is within 30 days. If a timely application is rejected, a reasonable additional period is allowed to apply again. In practice, a written application filed before day 90 may place the loan inside the window, depending on how quickly it funds after approval. How that applies to your loan is a call for your CPA.
Qualifying as acquisition debt is not the end of it; there is a ceiling. For acquisition debt taken out after December 15, 2017, interest is deductible on up to $750,000 of principal ($375,000 each if married filing separately), with main-home and second-home loans combined. That limit was originally written for tax years 2018 through 2025. Section 70108 of the One Big Beautiful Bill Act (P.L. 119-21), signed in July 2025, removed the end date and made it permanent. California does not conform. The FTB's instructions for Schedule CA (540) state that California still figures the acquisition-debt limit at $1,000,000 ($500,000 married filing separately), and still allows interest on up to $100,000 of home equity debt (more on that below).
What if acquisition debt runs above $1 million — can the excess count as home equity debt, for roughly $1.1 million in total? In Revenue Ruling 2010-25, the IRS read the pre-TCJA version of §163(h) that way, and California follows the pre-TCJA text. But the FTB instructions don't address the point directly, so have a CPA confirm it for your return.
After day 90, the rule changes. Publication 936 puts it plainly: "No matter when the indebtedness was incurred, you can no longer deduct the interest from a loan secured by your home to the extent the loan proceeds weren't used to buy, build, or substantially improve your home." A cash-out taken on day 91 or later, with the money invested or held as cash, is not deductible as mortgage interest at the federal level. The publication also notes that when loan proceeds go into a business or investments, the interest is reported under other rules. Whether any of it is deductible that way depends on where the money goes, and is a question for your CPA. California parts ways with federal law here too: per the FTB, the deduction for interest on up to $100,000 of home equity debt ($50,000 married filing separately), suspended federally, is still allowed in California.
Two: the lending clock — month six, and which market your loan size lands in
Fannie Mae's Selling Guide B2-1.3-03 (December 10, 2025) requires that, for an ordinary cash-out refinance, at least one borrower has been on title for at least six months before the new loan disburses. Delayed financing is the exception to that seasoning rule: "Borrowers who purchased the subject property within the past six months (measured from the date on which the property was purchased to the disbursement date of the new mortgage loan) are eligible for a cash-out refinance," provided several conditions hold. The original purchase was an arm's-length transaction. The settlement statement shows no mortgage financing was used. A title search shows no liens on the property. And the source of the purchase funds is documented. If the purchase money was itself borrowed — a HELOC on another property, for example — the new loan's proceeds must pay that debt off or pay it down.
Two ceilings apply, and the lower one wins. The new loan can be no more than "the actual documented amount of the borrower's initial investment in purchasing the property plus the financing of closing costs, prepaid fees, and points on the new mortgage loan," and it is also subject to the cash-out LTV limit on the current appraised value. Fannie Mae adds that delayed financing carries cash-out pricing: "Cash-out pricing is applicable."
The real constraint is scale. Fannie Mae buys only loans within the conforming limit. FHFA's 2026 baseline limit for a one-unit home is $832,750, and the high-cost ceiling is $1,249,125; Santa Clara and San Mateo counties both sit at the ceiling. On a $6 million home, this route returns about one-fifth of the price at most. Borrow more than that and you are in the jumbo market, where each lender decides for itself whether it offers delayed financing at all, whether it requires seasoning, whether the loan is sized on the purchase price or the appraisal, and how long after closing it starts treating the loan as an ordinary cash-out. There is no common rule.
Three: the final number — cash invested, appraisal, and title
Even when a lender is willing, the approved amount has to pass three gates. The first is how much cash you paid. In a delayed-financing structure, the loan is capped at the documented cash invested plus the new loan's costs, and gaps in your source-of-funds records shrink what can be counted. The second is the appraisal: LTV is calculated on the appraised value at the time of the loan, not on your purchase price. The third is the titleholder. Fannie Mae Selling Guide B2-2-01 requires borrowers to be natural persons, with exceptions only for inter vivos revocable trusts and, in some states, land trusts; an LLC is not an eligible borrower. The last two gates each get their own section below.
The timeline: from writing the offer to month six, what changes at each point
The short version: on a $6 million all-cash purchase, day 90 is the tax line and month six is the Fannie Mae line, and they fall on different dates. A loan secured by the home and taken out within 90 days counts as acquisition debt up to the home's cost. Federally, interest is deductible on $750,000 of principal; California figures it on $1 million of acquisition debt, and whether the excess can add up to $100,000 of home equity principal is a CPA question. From day 91, the federal mortgage interest deduction drops to zero, and California leaves only $100,000 of home equity principal. Fannie Mae's delayed financing stays open for the full six months, but it tops out at $1,249,125, about 21% of the price.
| Point in time | Available loan path | How the amount is set | Rate basis | Interest deduction (federal / California) |
|---|---|---|---|---|
| Before writing the offer | Ask jumbo lenders able to handle a $5M-level loan for written terms: how soon after closing you can borrow, and which titleholders they accept | Ask whether the amount is based on purchase price, appraisal, or cash invested, and which LTV applies | An indicative quote only; the actual rate is set at application and lock | Not yet applicable |
| All-cash closing (day 0) | No loan on the home; keep the settlement statement, source-of-funds records, and title report on file | Your documented cash investment is fixed as of this day | — | — |
| Days 1–90 after closing | Conforming: Fannie Mae delayed financing (up to $1,249,125); jumbo: per written terms | Fannie Mae: no more than cash invested plus new-loan costs, and no more than current appraisal × cash-out LTV limit | Fannie Mae: cash-out pricing; jumbo: per written quote | Acquisition debt up to the home's cost: federal on $750K of principal; California on $1M of acquisition debt, with up to $100K of home equity principal on the excess subject to CPA confirmation |
| Day 91 to month six | Same; Fannie Mae delayed financing still available | Same | Same | No longer acquisition debt (unless used to build or substantially improve the home): no federal mortgage interest deduction; California home equity on up to $100K of principal |
| After month six | Fannie Mae standard cash-out (at least one borrower on title for six months); jumbo: per written terms | Fannie Mae: current appraisal × cash-out LTV limit, no longer capped by cash invested, still limited to $1,249,125 | Cash-out pricing | Same as from day 91 |
Sources: IRS Publication 936 (2025 edition); IRS Revenue Ruling 2010-25; One Big Beautiful Bill Act (P.L. 119-21), Section 70108; California FTB 2025 Instructions for Schedule CA (540); Fannie Mae Selling Guide B2-1.3-03 (December 10, 2025) and B2-2-01 (September 3, 2025); FHFA 2026 conforming loan limits. Updated: October 2026. Scope: owner-occupied, one-unit Bay Area primary residences bought all-cash by U.S. tax residents; jumbo terms follow each lender's written terms.
What to take from this: the stretch from day 91 to month six is where most mistakes happen. The loan still gets approved; the interest just no longer counts as acquisition-debt interest. Take an illustration. Borrow $3 million at 7% (both figures hypothetical, not any lender's quote) and the interest runs about $210,000 a year. Taken out within 90 days, the federally deductible share is the interest on $750,000 of principal, about $52,500. In California it is the interest on $1 million, about $70,000, or about $77,000 if the excess can add $100,000 of home equity principal (subject to CPA confirmation). Taken out on day 91 or later, with the money invested, the federal figure goes to zero, and California keeps only the interest on $100,000 of principal, about $7,000.
The same example shows that at $6 million, the deduction reaches only the interest on the first $750,000 to roughly $1.1 million of principal. Whether to borrow, and how much, depends mostly on how you want to manage liquidity; tax decides the fate of only a small slice of the interest. And 90 days is not generous. A jumbo loan has to clear appraisal and underwriting. Start looking for a lender only after closing, switch lenders once along the way, and much of the window can be gone.
Titleholder: individual, revocable trust, LLC, or offshore entity — what changes when you borrow later
The short version: under Fannie Mae's rules, eligible borrowers are natural persons, inter vivos revocable trusts, and, in some states, land trusts. An LLC is not among them. Delayed financing does accept a home originally bought through an LLC that the borrower owns 100%, but Fannie Mae states that to close the refinance, ownership must be transferred out of the LLC and into the individual borrower's name.
| Titleholder | Eligible Fannie Mae borrower? | Accepted as the purchaser under delayed financing? | What to resolve before borrowing later |
|---|---|---|---|
| Individual (natural person) | Yes | Yes | No change to title needed |
| Inter vivos revocable trust | Yes (an exception listed in B2-2-01) | Yes, if the borrower both established the trust and is its beneficiary | Whether a jumbo lender will lend to the trust depends on its written terms |
| LLC or partnership | Not an eligible borrower | Yes, if the borrower or borrowers own 100% individually or jointly | Title must first move into the borrower's individual name; have an attorney assess the legal and tax effects of that transfer |
| Foreign company or offshore structure | Not an eligible borrower | Not among the purchasing entities Fannie Mae lists | Whether you can borrow, and whether the structure must change first, depends entirely on a specific lender's written terms |
Sources: Fannie Mae Selling Guide B2-2-01 (September 3, 2025) and B2-1.3-03 (December 10, 2025). Updated: October 2026. Scope: conforming loans; jumbo terms follow each lender's written terms.
What to take from this: the titleholder is fixed on closing day. Changing it later is a new transfer of title, handled by an attorney with the title company's help, and the time it takes comes straight out of the 90-day and six-month windows. For a family planning to borrow after closing, whose name to buy in and whether to borrow belong in the same conversation.
When the appraisal comes in below the price, how much the loan shrinks
In Palo Alto, selling above the asking price is common. According to MK Bay Area Pulse (MLSListings data), across 139 single-family closings in Palo Alto in Q2 2026, the median ratio of sale price to original list price was 105.6%. An all-cash buyer needs no appraisal and can pay whatever the bidding reaches. Borrow after closing, though, and the lender works from the appraisal at that point.
An illustration: a $6 million purchase, with written terms that cap the cash-out at 70% of appraised value (a hypothetical figure, not any lender's). If the appraisal matches the price, the cap is $4.2 million. If it comes in at $5.7 million, the cap falls to $3.99 million — $210,000 less. In Fannie Mae's delayed financing structure, the loan is also capped by your cash invested, and the lower of the two applies. A low appraisal pulls the number down; a high one cannot lift it above your cash invested. Whether a jumbo lender sizes the loan on price or appraisal in the months after closing, and whether it takes the lower of the two, is one of the questions to settle before you write the offer.
The pricing gap between cash-out and purchase loans, and the rate risk of waiting
First, the pricing rule. Fannie Mae files delayed financing under cash-out refinance and states that cash-out pricing applies. Jumbo cash-out pricing typically runs above purchase-loan pricing as well; how far above is something only a lender's written quote can tell you.
Then, timing. When you borrow after an all-cash closing, your rate is set by the market at the time of the loan, not on the day you wrote the offer. Freddie Mac's PMMS weekly average for the 30-year fixed rate averaged 6.41% across the 13 weeks of Q2 2026. It stood at 6.43% the week of July 2 and 7.28% the week of October 1: up 0.85 percentage points in 91 days. PMMS is based on applications submitted to Freddie Mac and reflects the agency market; jumbo quotes are a separate matter. But the direction of the risk is the same. Paying cash first means you carry whatever rates do between closing and funding.
What MK Group sees in practice: cash buys the seller certainty; liquidity needs its own plan
Above $5 million, cash buyers are plentiful. In MK Bay Area Pulse data for Q2 2026 (MLSListings single-family closings across 57 cities in three counties), 44.4% of the 279 closings between $5 million and $10 million were all-cash, as were 71.8% of the 39 between $10 million and $20 million and 75.0% of the 8 above $20 million. By city, Palo Alto stood at 36.0% and Atherton at 64.5%. For why financed closings picked up above $10 million in the same quarter, see why Bay Area luxury buyers started taking mortgages after the stock rally.
Cash doesn't guarantee a win. One MK Group client, with a $10 million all-cash budget, found a benchmark Palo Alto home listed at $10 million and wanted one more night to think it over. By the next morning, another buyer had signed for it, very likely also paying cash (case details). When both sides can pay cash, the funding advantage disappears and the contest moves to how fast each side can decide.
Financing at purchase puts the cost on the certainty of the offer. On an $18 million off-market purchase in Atherton, Marie Wang (DRE# 02110980) and Kevin Mo (DRE# 02127623) represented the buyer. The buyer had the means to pay cash but, for personal reasons, chose to borrow about $10 million. A loan that size is hard for most banks and lenders to take on, so the team brought in a lender able to handle it and kept several alternatives running in parallel. The loan needed 30–35 days and two bank appraisals, while most of the competition were cash buyers able to close in 7–10 days. That is why the offer started at a disadvantage (case details; for a full comparison of closing timelines with cash versus a loan, see how long a $5M+ Bay Area purchase takes from signed contract to closing).
The deal closed on the fit between buyer and house, and on the certainty built into its execution. The buyer did not pay cash first and borrow later; the deal appears here to show where each arrangement puts its cost. Borrow at purchase, and the cost is the uncertainty the seller sees. Borrow after closing, and the cost is what this article covers: two clocks, several loan ceilings, and rate risk. It also bears directly on the 90-day window. A purchase loan of about $10 million took 30–35 days and two bank appraisals. A post-closing loan is a different product, but at this size its appraisal and underwriting take real time as well.
The titleholder, meanwhile, has to be settled before the offer. MK Group handled an all-cash purchase of about $11 million in Los Altos Hills where the buyer was a corporate entity and the deal locked in two weeks. Rather than push for an ultra-short closing, the team first worked through three questions with the client: whose name to buy in, how the money moves, and how the home will be held (case details). For a family that plans to borrow after closing, the third question carries one more: can that entity later be the borrower?
Liquidity can also be arranged before the purchase. An employee at an AI company first sold part of a pre-IPO stake on the secondary market, then bought in Los Altos Hills with cash (case details). This article covers the opposite sequence: pay cash first, then borrow part of it back after closing.
Common mistakes
Mistake one: "Whenever I borrow after closing, the interest is deductible as acquisition-debt interest"
Not so. Publication 936 lets a loan be treated as acquisition debt only when the home was bought within 90 days before or after the loan is taken out, and only up to the home's cost. A loan taken out on day 91 after closing, with the money not used to build or substantially improve the home, is not deductible as mortgage interest at the federal level, and California allows only the interest on up to $100,000 of home equity principal. Even within 90 days, the federal deduction covers only $750,000 of principal; interest on the rest is not deductible as mortgage interest. California figures it on $1 million of acquisition debt, and whether the excess above $1 million can add up to $100,000 of home equity principal is for your CPA to confirm. The date a loan is taken out is generally the funding date. Under Publication 936, the date of a written application can count instead, provided the loan funds within a reasonable time after approval (the publication's example is within 30 days). Whether your application date qualifies, and whether the way you use the money changes how it is reported, are things to confirm with your CPA before the loan funds.
Mistake two: "A home bought with cash can't be mortgaged for a year"
Not under Fannie Mae's rules. A standard cash-out requires at least one borrower on title for six months; inside those six months, the delayed financing exception lets an all-cash buyer borrow directly, up to the cash invested plus the new loan's costs. The "one year" people often cite is a different rule: an existing first mortgage being paid off through a cash-out must be at least 12 months old, measured from its note date. A home bought with cash has no existing mortgage, so that rule doesn't come into play. Keep in mind that these are Fannie Mae rules and govern only loans up to $1,249,125. Seasoning on a $6 million jumbo is set by each lender, may differ from Fannie Mae's, and should be confirmed in writing.
Mistake three: "A home held in an LLC can use delayed financing just as it is"
Half right. Fannie Mae's delayed financing accepts a home originally bought by an LLC, as long as the borrower or borrowers own 100% of it individually or jointly. But the LLC itself cannot be the borrower: B2-2-01 lists only natural persons, inter vivos revocable trusts, and land trusts in some states. Fannie Mae states that to close the refinance, ownership must be transferred out of the LLC and into the individual borrower's name. That means a title transfer before the loan, with an attorney and the title company involved, and the time it takes counts against the six-month window — tighter still if you are also aiming for the 90-day tax window. For a jumbo loan, whether a home held in an LLC can be financed at all, and whether title has to move first, comes down to the lender's written terms.
Mistake four: "I paid $6 million in cash, so after closing I can borrow most of the purchase price back"
Not necessarily. Under Fannie Mae's structure, the loan is limited by three numbers at once — documented cash invested plus new-loan costs, the cash-out LTV limit on the current appraisal, and the $1,249,125 conforming limit — and the lowest of the three applies. On a $6 million home, the last one covers about 21%. Jumbo loan size and LTV are set by each lender, and if the appraisal comes in below the price, any limit based on the appraisal falls with it. How much you can borrow back is a question to have a lender answer in writing before you write the offer.
Next steps
- Before writing the offer, go to one or two jumbo lenders that handle loans above $5 million and get four answers in writing: the earliest you can borrow after closing; whether the loan is sized on purchase price, appraisal, or cash invested; which titleholders they accept; and how far cash-out pricing sits above purchase pricing.
- Settle the titleholder with your attorney and CPA — individual, revocable trust, or LLC — and make sure the conclusion answers whether that titleholder can later be the borrower directly. Share the decision with escrow and the title company.
- Keep records from the first deposit wire onward: the source of every dollar of purchase money, the final settlement statement, and the title report. These are what later prove your cash invested and that no mortgage was used at purchase.
- Counting from the closing date, mark day 90 and the six-month date on the calendar. If the goal is acquisition-debt treatment, file the written loan application before day 90 and leave room for appraisal and underwriting, so that funding can land inside the window as well.
- Before the loan funds, have your CPA confirm three things — whether your written application date can count as the date the loan is taken out, how you plan to use the money, and how much interest is deductible federally and in California — then decide how much to borrow.
This article is for decision education and is not legal, tax, or lending advice. Confirm specifics with your attorney, CPA, and lender. The IRS, California FTB, Fannie Mae, and FHFA rules cited reflect the current texts as reviewed in October 2026; seasoning, loan size, and pricing on jumbo loans are set by each lender. The rate, loan amount, LTV, and appraisal figures in the examples are illustrative and do not represent any lender's quote or terms.