To cover the equity gap in a mortgage assumption, you deliver the difference between the purchase price and the seller’s loan payoff at closing, using cash, a second mortgage, seller financing, gift funds, or some combination of the four. Every dollar of that funding has to be documented and cleared by the seller’s loan servicer before the assumption closes. On homes bought five or more years ago at a low FHA or VA rate, the gap often runs into six figures, which is why the funding plan matters as much as the interest rate you’re trying to inherit.
Pin Down the Gap Before You Plan Around It
Request a formal payoff quote from the seller’s servicer. Do not work from the balance printed on a monthly statement. The payoff figure includes accrued interest through a specific date and is the number the servicer will actually use. Subtract the payoff from the negotiated purchase price and you have your gap.
If the sale price is $450,000 and the payoff is $325,000, the gap is $125,000. That is what has to arrive at the closing table from your funding sources combined. Getting this right matters because the servicer’s assumption underwriting verifies your funds against the exact gap. If the payoff comes in higher than expected because of accrued interest or an escrow shortage, a buyer without liquid reserves can stall the whole deal.
Cash From Savings or Liquidated Assets
Paying the gap in cash is the cleanest option. There is no second lender to coordinate with, and your monthly payment stays limited to the assumed mortgage. The servicer will ask for the most recent two months of bank or investment account statements to confirm the funds are available and seasoned.1Fannie Mae. Verification of Deposits and Assets Any large or irregular deposits in that window need a paper trail showing where the money came from.
The problem is size. Most buyers do not have $100,000 or more sitting in a checking account, which is why the funding methods below exist.
Second Mortgage or Home Equity Loan
You can, in theory, take out a second mortgage or HELOC from a separate lender to bridge the gap. The second lien sits behind the assumed first mortgage, and you make two monthly payments. Any subordinate lien must be disclosed to the primary servicer, and the combined loan-to-value ratio has to stay within its guidelines.2Fannie Mae. Subordinate Financing
In practice, finding a lender willing to sit behind an assumed government loan is hard right now. The secondary-lien market for assumptions is still developing, and most traditional lenders are not set up to underwrite these transactions. A handful of specialty lenders have entered the space. If you are counting on a second mortgage, start shopping for that lender at the beginning of the process, not the end.
Seller Financing
Seller financing means the seller carries part of the equity as a second loan. You sign a promissory note; the seller collects payments over time instead of taking the full equity at closing. The note spells out the interest rate, payment schedule, and maturity date. Many of these notes use a short term with a balloon payment at the end, so you need a plan to refinance or pay off the balance when the balloon comes due.
The primary servicer has to approve the arrangement. It will confirm the second lien does not violate the original loan’s terms and that your total debt still qualifies under underwriting guidelines. Expect a formal subordination agreement and full disclosure of the second lien’s terms.
Gift Funds
Family can give you cash to cover all or part of the gap. Lenders require a signed gift letter with the dollar amount, the donor’s name, address, phone number, and relationship to you, plus a clear statement that no repayment is expected.3Fannie Mae. B3-4.3-04 Personal Gifts The “no repayment” language is not optional. If the servicer suspects the gift is actually a disguised loan, it changes your debt-to-income ratio and can sink the approval.
Large gifts also trigger federal reporting for the donor. In 2026, the annual gift tax exclusion is $19,000 per recipient.4Internal Revenue Service. What’s New – Estate and Gift Tax A gift above that amount does not necessarily mean tax is owed, but the donor must file IRS Form 709. A married couple giving jointly has a combined exclusion of $38,000 per recipient before reporting kicks in. On a $125,000 gap funded entirely by parents, they would file Form 709 for the amount above the exclusion. The lifetime estate and gift tax exemption is high enough that most families will owe nothing, but the filing requirement catches people off guard.
Documents the Servicer Will Ask For
The servicer will not move the file forward until documentation is complete. Missing or incomplete documents are the most common reason assumption applications stall. What each funding source requires:
- Cash: Two months of consecutive bank or investment account statements showing the funds are available and seasoned.1Fannie Mae. Verification of Deposits and Assets
- Gift funds: A signed gift letter meeting the requirements above, documentation of the donor’s ability to give (usually the donor’s bank statements), and proof the funds were transferred.3Fannie Mae. B3-4.3-04 Personal Gifts
- Second mortgage: A commitment letter from the secondary lender with the loan amount, rate, and repayment terms, plus a promissory note and recorded security instrument for the subordinate lien.2Fannie Mae. Subordinate Financing
- Seller financing: A drafted promissory note with the rate, payment schedule, and maturity date, along with any subordination or secondary financing approval form the servicer requires.
Gather everything before you submit the package. It saves weeks of back-and-forth with the assumption department.
Fees You’ll Owe on Top of the Gap
Assumption processing costs money, and the amount varies by loan type. For VA loans, the buyer pays a funding fee of 0.5% of the remaining loan balance to the VA.5U.S. Department of Veterans Affairs. VA Funding Fee and Loan Closing Costs On a $325,000 balance, that is $1,625. The servicer charges its own processing fee on top of the VA funding fee. For FHA assumptions, HUD recently increased the maximum allowable processing fee to $1,800. Standard closing costs (title insurance, escrow, recording) apply as well and vary by location.
One inherited cost surprises buyers. If you assume an FHA loan originated after June 3, 2013, the annual mortgage insurance premium of 0.85% stays on the loan for its remaining life. On a $325,000 balance, that adds roughly $230 per month to your payment beyond principal, interest, taxes, and insurance. Factor it into your affordability math before you commit to closing the gap.
Confirm the Loan Is Actually Assumable
None of this planning matters if the loan cannot be assumed at arm’s length. All FHA-insured single-family forward mortgages are assumable, and the buyer must meet creditworthiness standards and hold a valid Social Security Number or Employer Identification Number.6U.S. Department of Housing and Urban Development. Are FHA-Insured Mortgages Assumable? VA-guaranteed loans are assumable, with the VA or the servicer evaluating the buyer’s credit.7Office of the Law Revision Counsel. 38 USC 3714 – Assumptions; Release From Liability USDA Section 502 loans can be assumed, though an unrelated buyer typically receives new rates and terms rather than keeping the original schedule.8U.S. Department of Agriculture. Section 502 Loans Chapter 2 – Types of Loans
Conventional loans backed by Fannie Mae or Freddie Mac are a different matter. Nearly all contain a due-on-sale clause, and federal law lets lenders enforce it and demand full repayment when ownership transfers.9Office of the Law Revision Counsel. 12 USC 1701j-3 – Preemption of Due-on-Sale Prohibitions Try to assume a conventional fixed-rate loan without lender approval and the servicer can accelerate the entire balance.10Fannie Mae. Conventional Mortgage Loans That Include a Due-on-Sale or Due-on-Transfer Provision A small number of older adjustable-rate conventional loans allow assumptions, but the practical universe is dominated by FHA and VA. Federal law carves out family and estate transfers from the due-on-sale rule (spouse or child, divorce, living trust with the borrower as beneficiary, transfer to a relative after death), but a sale to an unrelated buyer does not qualify.
Once you have confirmed the loan is assumable and pinned down the payoff, the gap-funding decision comes down to what you have on hand, what your family can give, and whether a second lender or the seller is willing to carry the rest. Line those pieces up early. The servicer will not close on a promise.