Assuming a seller's mortgage rate almost cost the buyers their financing

The situation

What Kiran and Feng were afraid of was simple: losing the house and the deposit both. They had put down forty-two thousand dollars on a bungalow in Sudbury, priced around six hundred and ten thousand, and the number that made the deal work was not the purchase price. It was the interest rate attached to the seller's existing mortgage, a fixed rate secured three years earlier that sat well below anything the lender was currently offering new borrowers.

Kiran worked as an electrician and Feng led an IT support team for a regional employer. Together their income was solid but not enough to comfortably absorb a mortgage at current rates on a six-hundred-thousand-dollar purchase. The seller's existing mortgage, assumed rather than replaced, changed the monthly number by several hundred dollars. Their agent had structured the offer around a mortgage assumption clause: the couple would qualify to take over the seller's loan, on its existing terms, rather than arrange new financing.

Assumption sounds simple in principle. The buyer steps into the seller's mortgage, the lender agrees to release the seller and accept the buyer as the new borrower, and the rate carries forward. In practice it depends entirely on the lender's cooperation, and lenders are not obligated to move quickly. The agreement of purchase and sale gave the lender's approval as a condition, with a deadline built in, but the deadline assumed the lender would respond to inquiries in a normal commercial timeframe.

Three weeks before closing, the lender had not responded at all. The mortgage broker handling the file said the assumption request was 'in process.' Kiran and Feng had already given notice on their rental. Their deposit sat in trust, and if the condition lapsed through their own inaction, the deal itself would collapse — the below-market rate that made the numbers work gone along with it, whether or not the deposit came back. They came to our office not with a legal question so much as a practical one: was there anything they could still do, or had they simply bet on a lender that was never going to answer in time.

What made the stakes feel higher than an ordinary financing delay was the math underneath the assumption. If the lender refused, or simply ran out the clock, Kiran and Feng would have to qualify for new financing at current rates on short notice, a monthly payment increase that would have pushed them past what a lender was likely to approve for their combined income. In practice, a failed assumption at this stage would not have meant a slightly worse mortgage. It would likely have meant no mortgage at all, and a deal they could no longer afford to close.

What the law actually said

The agreement's financing condition was drafted to protect the buyers only if they acted on it properly. It said the offer was conditional on the buyers obtaining, within a stated number of days, the lender's written approval to assume the existing mortgage on its current terms. What silence at the deadline meant depended entirely on how the condition was drafted, and this one was the common form: unless the buyers delivered written notice that the condition was fulfilled or waived by the deadline, the agreement was at an end and their deposit would be returned. Only a clause written the other way — firm unless the buyer gives notice of non-fulfilment — turns inaction into a firm deal, and this was not that kind of clause.

That structure still put the risk of a slow lender on the buyers, just not the way either of them had assumed. The seller had no obligation to chase the lender or extend the timeline, and if the deadline passed with silence, it would not force Kiran and Feng into a closing they could not afford — it would kill the deal outright, deposit returned, along with the below-market rate that had made the purchase work and the home they had already given rental notice to move into.

The complication was proving what state the lender's file was actually in. The broker's file notes were vague, and a phone call is not evidence. What ended up mattering was something nobody had thought to pull until we asked: the couple's own email inbox. Buried in a chain with the broker, an assistant at the lender had confirmed in writing, six days before the deadline, that the assumption had been internally approved and was 'proceeding to documentation.' Nobody had flagged it as significant at the time. It read like routine correspondence. It was, in fact, the lender's written approval the condition required, just never formatted as a formal approval letter.

That distinction between substance and form is where a lot of real estate conditions get lost. An agreement rarely says the approval must arrive on letterhead in a particular format. It says approval must be obtained. An email from someone with authority at the lender confirming approval can satisfy that, provided the content is unambiguous and the timing fits inside the window the agreement set.

There was a second layer to the analysis, because finding the email did not automatically end the problem. We still had to consider whether the couple had, in the seller's eyes, already missed the deadline by failing to deliver formal notice of fulfillment on time, even if the underlying approval had technically arrived within the window. Real estate agreements are often read strictly on timing, and a seller looking for a way out of a deal that had since become less attractive could have argued that silence past the deadline meant the condition had never been properly declared satisfied, regardless of what the lender's file actually showed.

What we did

1. Pulled every piece of correspondence the couple had, not just the broker's summary, because a condition this close to its deadline needed primary evidence rather than a secondhand account of where things stood. That meant going through Kiran and Feng's own inboxes, the broker's forwarded threads, and the agent's file, since the broker's notes alone would not have held up if the seller later disputed whether or when the condition had actually been fulfilled.
2. Identified the buried email as the operative approval, reading it against the exact wording of the financing condition to confirm it named the lender, the loan, and an unqualified approval rather than a conditional or preliminary one. That precision mattered, because a vague or hedged confirmation would not have satisfied the condition, and it was what let us treat the condition as already met rather than still open and at risk of lapsing.
3. Sent formal notice to the seller's lawyer confirming fulfillment, attaching the email and stating plainly that the condition had been satisfied as of the date the lender's assistant had confirmed approval, not as of whatever later date the seller might prefer to argue for. Putting that date on the record in writing stopped the clock before the deadline could be characterized as missed through the couple's own inaction.
4. Pressed the mortgage broker for the formal documentation package, because an email confirming approval is not the same as the signed assumption agreement the lender actually needed to release funds and close. The broker's file had been sitting without follow-up for days, and left alone it would likely have kept sitting there until it became a genuine closing-day problem rather than a paperwork lag.
5. Set a firm internal deadline of our own, four business days before closing, by which the lender had to produce final assumption paperwork, and communicated that deadline directly to the lender's assumption department rather than relying on the broker as an intermediary. Going straight to the department responsible for the file removed a layer of delay that had already cost the couple weeks of uncertainty.
6. Reviewed the assumption agreement once it arrived for any change in terms from what the couple believed they were assuming, since lenders sometimes use an assumption request as an opportunity to adjust conditions in their own favour. We confirmed the rate and remaining amortization matched what had induced the couple to buy on these terms in the first place, because an assumption on altered terms would have undermined the entire reason they had structured the purchase this way.
7. Coordinated closing logistics under compressed time, working with the seller's lawyer to adjust the exact mechanics of closing day so that the late-arriving mortgage documentation would not itself cause a separate, entirely avoidable closing-day failure on top of the financing problem the couple had already survived. That included agreeing on a same-day funds flow the lender's own systems could actually meet, rather than assuming the paperwork delay would simply resolve itself before the scheduled closing time arrived.
8. Documented the whole sequence for the couple's own records, from the buried email through to the final signed assumption agreement, so that if any question about the timeline arose later, whether from their lender, their insurer, or the seller, there would be a clear, dated record showing exactly when each condition had actually been met rather than relying on memory or scattered messages spread across weeks of stressful back-and-forth.

The outcome

The deal closed, and Kiran and Feng kept the rate that had made the purchase affordable for them in the first place. That is the part of the story that reads like a win. It is also not the whole story.

The three weeks of uncertainty cost them real money and real stress that a more diligent broker file should have avoided. They paid for a short bridge in their rental arrangement to cover the risk of a delayed close, an expense in the low thousands that a properly tracked assumption process would not have required. They also lost the ability to negotiate anything else in the transaction, because by the time the approval question was resolved there was no room left to raise any other issue without threatening the deal they had just fought to save.

There was also a quieter cost that did not show up on any invoice. Feng took unplanned time away from work to deal with the broker and the lender directly during the final week, and Kiran spent evenings drafting messages instead of preparing for the move. Neither of those things appears in a settlement figure, but both were part of what the couple actually paid for a financing structure that should have been tracked more carefully from the outset.

This is what a mitigated outcome looks like in a real estate file. Nobody lost the house. Nobody lost the deposit. But the couple absorbed cost, delay, and a level of risk that the transaction structure should have protected them from if the financing condition had been tracked properly from the start. The lesson that stuck with them, and the one they repeated to their own agent afterward, was not about mortgage rates. It was about the difference between a broker saying a file is proceeding and having something in writing that actually proves it.

What you can learn from this