Debt to income, if that term is new to you, is the share of your gross monthly income, meaning what you earn before taxes come out, that goes to your required monthly debt payments. Add up the payments, divide by the income, and the percentage you get is the number underwriting weighs most heavily. How that ratio turns into a maximum loan amount is worth having straight before you shop anywhere near this line. Jumbo lending wants that number lower than conforming lending does.
The line itself is called the conforming loan limit, and most buyers shopping near it have never heard of it. That is a problem, because when you know where the line is, you can sometimes move your loan across it on purpose, with a change in structure rather than a change in house.
Two size classes, and a line that resets every year
A conforming loan fits inside the limit set by the Federal Housing Finance Agency, the federal regulator over Fannie Mae and Freddie Mac. Fannie Mae and Freddie Mac are companies chartered by Congress that buy closed home loans from the lenders who made them, package those loans, and sell them on to investors. Between them they buy a large share of the home loans made in the United States. Because a conforming loan follows their rules and fits under their size cap, one of them can buy it, and the lender gets its money back and lends it again. This is conventional lending, one of the four programs a buyer picks between, and the government backed three carry their own separate limits.
A jumbo loan is larger than that limit. It is too big for Fannie or Freddie to purchase, so the lender either keeps the loan on its own books for the life of the loan or sells it to a private investor with its own appetite and its own conditions.
Here is the one sentence in this article that will go out of date, so it is the sentence to check rather than trust. As of 2026, the baseline conforming limit is 832,750 dollars for a one unit home in most of the country, and the ceiling in the highest cost counties is 1,249,125 dollars. The Federal Housing Finance Agency resets those figures every year and publishes a separate limit for every county in the country, so the number that governs your loan is your county's number on the day you apply. Not the baseline, and not what you read in an article, including this one.
Notice what the limit measures. It is the loan amount, not the purchase price. A one million dollar home with 400,000 dollars down is a 600,000 dollar loan, comfortably conforming in most counties. Price gets the attention, but the line only cares about how much you are borrowing.
Why the line changes how hard you have to qualify
This is not a rule someone invented to be difficult. It follows directly from who holds the risk.
When a loan is conforming, the lender can sell it shortly after closing. That makes the loan standardized, widely available, and priced in a deep and liquid market. The rules are published, the same everywhere, and generally more forgiving.
When a loan is jumbo, nobody is standing behind the lender. The bank either keeps that loan for thirty years or finds a private buyer. More risk sitting with the lender means more scrutiny landing on you.
So jumbo loans typically ask for a higher credit score, a lower debt to income ratio, a larger down payment, and more reserves. Reserves are months of mortgage payments verifiably saved and still sitting in your accounts after the closing is over. On the credit side that means the middle score a mortgage lender pulls has to clear a higher bar than it would on a conforming file. Same house, same price, same buyer. Cross the line and it is a tougher file.
The number is not national, so look up your county
One of the most common and most expensive misunderstandings here is treating the conforming limit as a single figure that applies everywhere. It does not.
High cost counties get higher limits, scaling up toward that ceiling. Which means the same loan amount can be jumbo in one county and comfortably conforming in the county next to it. If you are shopping a metro area that spans multiple counties, this is worth checking before you write an offer, not after.
Alaska, Hawaii, Guam and the US Virgin Islands work differently again. The higher figure is their ordinary baseline, not a high cost exception layered on top of a lower one.
To look yours up, go to the Federal Housing Finance Agency website and find the conforming loan limits page. FHFA publishes the full county list once a year, generally late in the year for the year ahead. Find your state, find your county, and read the one unit column unless you are buying a duplex or larger, because two, three and four unit properties get their own higher limits. It takes two minutes and it can change the shape of your entire loan.
The moves that pull a loan back under the line
Here is the practical part, and it is the reason this topic earns a full article rather than a footnote.
Start with something most buyers are never told. Most jumbo lenders will not write a loan with 5 percent down at all. Low down payment jumbo programs exist, but they are specialty products with their own credit, reserve, and income requirements, and most borrowers cannot get one. The ordinary jumbo file is expected to bring considerably more cash than the ordinary conforming file, which is the one corner of the market where the low down payment minimums that apply almost everywhere else stop applying. That is the first reason to restructure rather than assume the jumbo version of your deal is just a harder version of the same loan. Sometimes it is not on the menu for you at all.
The first lever is simple. If your loan would land just over the conforming limit, a somewhat larger down payment can pull the loan amount back under the line and into conforming territory, which is usually easier to qualify for and sometimes cheaper. You are not changing the house. You are changing the structure.
The second lever is a piggyback, which splits the borrowing into a first loan sized to stay under the conforming limit and a smaller second loan alongside it. The first loan stays conforming and follows the friendlier rules, while the second loan covers the gap. The second loan carries its own rate and its own terms, so the combined cost has to be compared honestly against the jumbo it replaces. But it is a real tool, and a buyer working alone almost never knows it exists.
Both of these are levers a good loan officer should be running for you before you are under contract, not after.
12,750 dollars over the line, and three ways to build the same purchase
These figures are an illustration, chosen so you can follow the arithmetic. Your county limit, your pricing, and your qualifying picture will differ.
Say you are buying a home for 890,000 dollars, in a county sitting at the baseline limit quoted above.
Structure one, the jumbo. Put 5 percent down, which is 44,500 dollars, and you borrow 845,500 dollars. That loan sits 12,750 dollars above the line, so it is a jumbo, with the stricter credit, reserve, and debt to income expectations jumbo underwriting brings. And as noted, at 5 percent down most jumbo lenders will decline to write it at all, so this structure is frequently theoretical.
Structure two, buy your way under the line. To land the loan exactly at the limit, you bring 57,250 dollars, which is about 6.4 percent down. That is 12,750 dollars more cash at the table than structure one asked for. The house is identical and the price is identical, but the loan is now conforming and you are qualifying against a friendlier and more standardized rulebook.
Structure three, the piggyback. Keep your 44,500 dollars down. Set the first mortgage at the limit, and cover the remaining 12,750 dollars with a small second loan. You borrow the same 845,500 dollars in total, the big loan is conforming, and your cash at the table stays at 44,500 dollars.
So the three numbers to hold onto are these. You are borrowing 845,500 dollars either way. Taking the conforming route in one loan costs 12,750 dollars of extra cash up front. Taking it in two loans costs a 12,750 dollar second mortgage instead, with a payment and terms of its own.
Now the part that usually goes unsaid. Loan to value is the loan divided by the value of the home, written as a percentage. In structure two, 832,750 dollars against an 890,000 dollar home is roughly 94 percent loan to value. In structure three, the two loans together are 845,500 dollars against the same home, roughly 95 percent. Both sit well above 80 percent, and above 80 percent a conventional loan generally carries mortgage insurance, a monthly premium that protects the lender if the loan defaults and does nothing for you except make the loan possible. Neither of these structures escapes it, though that premium has cancellation points written into federal law and is not a permanent feature of either one.
That is worth saying plainly, because avoiding mortgage insurance is the usual reason a piggyback exists in the first place. The classic version sets the first mortgage at exactly 80 percent of value and lets a second loan carry the rest. On this house that would be a first of 712,000 dollars, a second of 133,500 dollars, and the same 44,500 dollars down. No mortgage insurance on the first, because it is at 80 percent, and a first mortgage sitting comfortably inside conforming territory. It asks a great deal more of the second loan, and second loans carry higher rates and shorter or more variable terms, but that is the structure people mean when they say piggyback.
Whichever version you look at, compare the loans together rather than one at a time. Put the first and second amounts, and the rates you have been quoted for each, into the blended rate calculator, and you get a single combined number you can hold up against the one jumbo loan. That comparison, not the headline rate on either piece, is the decision.
Three structures, one house, one price. Which of them you can qualify for, and what each one costs you, comes down entirely to how the deal is built.
The myth: jumbo just means a big loan with a higher rate
Not exactly, and the sloppy version of this myth causes buyers to make bad decisions.
Jumbo pricing varies a great deal, and it is sometimes very competitive. Because jumbo loans often go to borrowers with strong credit and substantial assets, a lender may price one attractively to win that relationship. So no, jumbo does not automatically mean a rate penalty, and I am not going to tell you what jumbo pricing looks like today, because that changes.
What jumbo reliably means is stricter qualifying. Higher score expectations, tighter debt to income, more down, more reserves, more documentation. The real story is the bar you have to clear, not a guaranteed price difference. Plan for the bar, and treat pricing as something you find out rather than something you assume.
What to do next
If the home you want would put your loan anywhere near your county's conforming limit, do two things this week.
Look up that limit on the FHFA county list, for the specific county the property sits in. That number, not the national baseline and not the figure your friend quoted from a different state, is the one governing your loan.
Then ask your loan officer one direct question. Would a slightly larger down payment keep this loan conforming, and what does that cost me compared with going jumbo. Ask it before you are under contract, while you still have room to adjust the offer and the deposit. It is a two minute question, and the answer can move you into an easier and sometimes cheaper loan without changing the house at all.
For the loan officers reading this
Buyers, go look up your county and stop there. What follows is for the loan officers.
Know the current conforming limit cold, and know the limits for every high cost county you write in. This is one of the few places where you can restructure a deal and save a client real money and real aggravation in the same conversation.
The down payment to conforming move and the piggyback structure are advisor level plays. The buyer cannot run them alone, because the buyer does not know the line exists. Running them unprompted, early, is what separates you from an order taker.
And remember that individual lenders add their own stricter rules on top of the jumbo guidelines, and those extra rules vary widely from shop to shop. The same borrower can be a difficult jumbo file at one lender and a clean one at another. Shopping the jumbo is part of the job, not an extra.