Jumbo, Conforming,
Max lookback for jumbo and conforming follows Optimal Blue OBMMI on FRED, which starts around 2015 — not a shorter site cutoff. Treasury CMTs go back further but are clipped to the same window on this chart.
* Optimal Blue Mortgage Market Index (OBMMI): daily average of actual consumer rate locks submitted through Optimal Blue’s product-and-pricing engine (roughly one-third of U.S. residential locks), filtered to owner-occupied single-family purchase and rate/term refinance loans — not a survey of quoted rates. Optimal Blue MMI · FRED OBMMIC30YF
Jumbo is pricing 0.12 pts above conforming.
In much of Fairfield County the purchase price pushes a normal 20% down loan past the conforming limit, so the jumbo line is often the one that matters. Jumbo does not automatically mean more expensive: banks keep many jumbo loans on their own books and will price aggressively for strong borrowers, which is why the two lines cross from time to time.
How rates are determined
The Fed sets an overnight rate. Your mortgage is priced off long-term bonds.
A 30-year mortgage is a long-dated bond, so its price follows long-term yields — above all the 10-year Treasury and mortgage-backed securities (MBS) that trade against it. When investors demand more yield to hold that paper, quoted mortgage rates rise, whether or not the Fed met that month.
The gap between the 30-year mortgage average and the 10-year Treasury is the spread investors and lenders charge for prepayment risk, servicing, and profit. Right now that gap is about 1.99 points (6.67% mortgage vs 4.68% Treasury).
The Fed still matters — it moves short-term rates, shapes expectations for inflation and growth, and its balance sheet affects who is buying MBS. It just does not set your note rate. That is why rates sometimes fall on a Fed hike, or rise after a cut: the bond market had already priced in the decision and reacted to the language instead. Meeting dates and the prevailing target range live on Fed analysis.
10-yr Treasury
Benchmark long-term yield
MBS spread
Risk + servicing + profit
Your file
Credit, LTV, occupancy, loan size
The secondary market
Most lenders do not keep the loan they just closed. They sell it, recycle the cash, and lend again. That resale market is what makes a 30-year fixed rate possible at all — few banks would lend their own deposits for thirty years at a fixed rate.
- 01Origination — A lender or broker underwrites and funds your loan at closing.
- 02Sale — The loan is sold — often within weeks — to an aggregator, bank, or one of the GSEs.
- 03Securitization — Similar loans are pooled into mortgage-backed securities and sold to investors worldwide.
- 04Servicing — The right to collect your payment is a separate asset, which is why your payment address can change while your terms never do.
Practical consequence: the rules for the loan you can get are written by whoever buys it, not by the person taking your application. That is why a file that fits agency guidelines prices better than one that does not.
Fannie Mae & Freddie Mac
Same secondary-market job today — different origins, and a reason Freddie exists at all.
Neither lends to you directly. Both are government-sponsored enterprises that buy closed conforming loans from lenders, guarantee timely payment to investors, and package them into mortgage-backed securities so cash can flow back into new originations. Both have been in federal conservatorship since 2008. The interesting part is why Congress built a second one.
Fannie Mae · 1938
Create a national secondary market after the Depression
Chartered as the Federal National Mortgage Association to make sure lenders could sell mortgages and keep lending — first mainly government-backed (FHA/VA) loans, later conventional conforming loans as well. For decades it was the dominant buyer, working most naturally with larger commercial banks and mortgage companies.
Freddie Mac · 1970
Break Fannie’s monopoly and serve the thrift channel
Created by the Emergency Home Finance Act as the Federal Home Loan Mortgage Corporation. The point was not a different product for borrowers — it was competition for Fannie, and a secondary-market outlet for savings & loans and smaller thrifts that had been under-served when Fannie was the only large buyer. Same era also let both GSEs buy conventional (non-FHA/VA) mortgages more broadly.
So Freddie does not exist to serve a separate class of homebuyer (different credit scores, different loan types). It was built to serve a separate slice of the lender side — thrifts and smaller institutions — and to keep one GSE from setting the entire secondary-market price of conforming credit. Over time those channels blurred: both buy from banks, credit unions, and mortgage companies, both guarantee MBS, and both sit under the same FHFA conservatorship and conforming-loan rules.
Key distinctions that still matter
- Origin story. Fannie = Depression-era liquidity for a national mortgage market. Freddie = 1970 competition + thrift access so Fannie was not the only buyer.
- Who they historically bought from. Fannie leaned toward large commercial banks and mortgage companies; Freddie toward savings & loans and smaller thrifts. Today both buy across channels — the old split is history, not a hard wall.
- Same borrower product, not a different market segment. For you, a “Fannie loan” and a “Freddie loan” are both conforming agency loans under shared FHFA limits and similar credit/LTV/occupancy rules. Your rate difference is usually lender execution and pricing, not a different GSE mission.
- Where they diverge from Ginnie Mae. Ginnie Mae (also 1968-era) guarantees securities backed by government loans (FHA, VA, USDA). Fannie and Freddie are the conventional conforming channel — private credit risk with an implicit/explicit federal backstop via conservatorship, not full-faith government insurance on the loan itself.
- Why you still feel both. Their selling guides and automated underwriting set most of the credit, income, appraisal, and property standards behind quoted conforming rates. Jumbo is everything above the FHFA limit — outside this Fannie/Freddie buy box.
Conforming loan limits · 2026
Agency buy box for 1–4 unit properties. Limits rise with unit count; 5+ units are outside this conforming ladder.
High-cost CT towns · Norwalk · New Canaan · Westport · Wilton · Weston · Fairfield · Ridgefield
| Area | 1-unit | 2-unit | 3-unit | 4-unit |
|---|---|---|---|---|
Baseline Most of the country | $832,750 | $1,066,250 | $1,288,800 | $1,601,750 |
Western CT / Greater Bridgeport Local high-cost area Local high-cost area (elevated above baseline) — not the national high-cost ceiling. Verify against the FHFA planning-region table each year. | $977,500 | $1,251,400 | $1,512,650 | $1,879,850 |
High-cost ceiling National cap at 150% of baseline — not CT | $1,249,125 | $1,599,375 | $1,933,200 | $2,402,625 |
High-cost vs ceiling
TMRE towns sit in the Western CT / Greater Bridgeport high-cost area — an elevated conforming limit above the national baseline (1-unit $977,500 in 2026). That is not the high-cost ceiling ($1,249,125 1-unit), which is the FHFA national maximum (150% of baseline). No Connecticut planning region is at that ceiling today.
FHFA resets these every year based on national home-price growth. At or under the limit for that unit count, the loan is conforming and can be sold to Fannie or Freddie. Above it, the loan is jumbo — priced by banks and private investors, usually with tighter reserve and down payment expectations. Always confirm the current figure on the FHFA table before you plan around it.
Strategies · buyers & move-ups
Negotiate the payment, not just the price
A seller-paid rate buydown often lowers the monthly payment more than the equivalent price cut — and it is easier for a seller to accept than a headline reduction.
Price the loan, then the house
Get fully underwritten before you shop. In a jumbo market the loan structure — down payment, reserves, loan size relative to the conforming limit — moves your rate as much as the market does.
Decide if the rate is temporary
If you would refinance the moment rates drop, buy the house on today's payment and treat the rate as refinanceable. If you would not, structure for the long haul instead of paying for optionality.
Consider the shorter or adjustable term deliberately
A 15-year or an ARM can price meaningfully below the 30-year fixed. Both are tools, not defaults — the question is how long the money is really staying in this house.
Sequence buying and selling on purpose
Bridge financing, a HELOC on the current home, or a rent-back after closing all exist so you are not forced to make your worst decision under time pressure.
Strategies · sellers & downsizers
Price against today's payment
Buyers shop monthly cost. When rates are higher than when your neighbor sold, that comp does not translate directly — the same payment now buys less house.
Offer financing help instead of a price cut
A credit toward a buydown or closing costs can widen your buyer pool at a lower real cost than repeated price reductions, and it keeps your closed comp intact.
Know what your low rate is actually worth
A locked-in low rate is only transferable if the loan is assumable, which generally means FHA or VA — not conventional. Otherwise the rate is a reason to time the move well, not a reason to never move.
Model the downsizing math fully
Sale proceeds, the new payment, taxes, and carrying costs during the gap all belong in one picture. Downsizing the square footage does not always downsize the monthly cost.
Plan the tax conversation early
Capital gains treatment on a primary residence has rules and limits worth reviewing with your CPA before you list, not after you have an accepted offer.
What this page is not
Not a rate quote
The figures above are published national survey and lock averages. Your rate depends on your file and your lender, and can change during the day.
Not a commitment to lend
TMRE is a real estate brokerage, not a mortgage lender. Financing terms come from your lender in writing.
Not tax or legal advice
Capital gains, ownership structure, and estate questions belong with your CPA and attorney.
Not a forecast
Nothing here predicts where rates go next. It explains what moves them so you can react to the market you actually get.
Rate series from FRED (Freddie Mac PMMS, Optimal Blue, U.S. Treasury) · last synced 8/13/2026, 4:55:46 PM ET