This year, the conforming loan limit for Fairfax County is $1,249,125 for a one-unit home. The frequently mentioned $832,750 is the national baseline limit and not the jumbo threshold for this area.

One of the most common misconceptions I've encountered over the years is right here. Many people worry about jumbo loans when home prices are in the $900,000 range.

The limit for 2027 has not yet been released as of this writing. The FHFA indicates that it updates the limits at the end of November each year, and last year it was announced on November 25.

The new limit will take effect on January 1 of next year. The numbers circulating for 2027 are all estimates or based on the lending institutions' own criteria.

Let's first look at how the limits are determined. The baseline limit follows the quarterly changes in the FHFA House Price Index. This year's limit reflects a 3.26% increase, rising from $806,500 to $832,750.

For high-cost areas, there is an additional calculation. If the area median home value exceeds 115% of the baseline limit, the limit increases, with a cap at 150% of the baseline limit.

The $1,249,125 for Fairfax is exactly 150% of $832,750. If Fairfax remains a high-cost area next year, it will increase along with the baseline limit.

Lending institutions have already released their numbers for next year. According to a report from HousingWire, in September, Rocket Mortgage set a one-unit limit at $845,000, UWM at $847,440, and PennyMac at $850,000.

One mortgage information site estimates a 2.7% increase, predicting a baseline limit of $855,000 and a cap of $1,282,500. This is not an official figure but a calculation from an industry site.

If this prediction holds, the Fairfax limit would increase by $33,375. Such a movement would narrow the affected range to loans just above the threshold.

Using Centreville's market data makes this clearer. According to the Fox Homes Team, based on Bright MLS data, the median sales price over the past 12 months from November last year to October this year was $600,000, with 670 transactions. This is not official statistics but the team's own aggregation.

From the same aggregation, the median prices by type are $890,000 for single-family homes, $550,000 for townhouses, and $348,500 for condos.

If you put down 20% on a single-family home at the median price, the loan would be $712,000. This is lower than the national baseline limit.

If you only put down 5%, the loan would be $845,500. This exceeds the baseline limit but falls far short of the Fairfax limit, so it is not a jumbo loan.

The range between $832,750 and $1,249,125 is typically referred to as the high-balance area. Even within conforming loans, rates and costs can differ from the general range, so you should check estimates separately.

The real threshold is higher. Assuming a 20% down payment, a loan of $1,249,125 corresponds to a home price of $1,561,406.

For example, if you put down 20% on a $1.6 million home, the loan would be $1.28 million. This exceeds this year's limit by $30,875.

At this point, there are two paths. You can either increase your down payment by $30,875 to conform or go straight for a jumbo loan.

If the cap is expected to be $1,282,500, the same loan would fall within the limit next year. However, this is still hypothetical.

So, what would the rate difference be? According to reports citing the MBA weekly survey, the average 30-year fixed rate for the week ending September 11 was 6.97% for conforming loans and 7.03% for jumbo loans.

This is an average for one week in September, and there can be variations in industry data, so individual estimates may differ. However, looking solely at the rate may not be sufficient to carry over into the next year.

It may be better to first consider the underwriting criteria. Jumbo loans follow the lending institutions' own criteria rather than those of Fannie Mae and Freddie Mac, so deposit and income documentation requirements vary by bank.

Be cautious when reading the early limits from lending institutions. The reports I've checked only cover the general regional baseline limits and the numbers for Alaska and Hawaii, without clarifying whether they apply to high-cost counties like Fairfax.

One information site explains that before the new limits take effect, loans exceeding the current limits cannot be transferred to Fannie Mae and Freddie Mac. If the FHFA numbers are lower than the lending institution's numbers, that excess becomes an issue.

Therefore, please ensure you have written confirmation on three points: what the limit applicable to Fairfax is, whether you need to schedule closing after January 1, and how conditions change if the FHFA numbers differ.

If you are already using a jumbo loan, check your balance first. Even if the limit increases, existing loans do not automatically change, and you need to calculate refinancing costs to determine any benefits.

You can find the official numbers after they are announced by checking the county-specific table on the FHFA site for Fairfax County. I hope you do not rely on the numbers mentioned in blogs or advertisements.

If I were you, I would wait until the end of this month to see the announcement before taking action if I am still in the contract phase. If a contract is already in progress, I would not disrupt the schedule while hoping for a limit change of around $30,000 based on estimates.

If you are looking at a home that falls on the threshold, ultimately, the variable will be your down payment capacity rather than the limit. Loan conditions vary based on individual circumstances, so please confirm the final decision with your loan officer or financial expert.