How an Open HELOC Counts When You Apply for Your Next Mortgage: DTI on the Balance or the Full Line, and When to Pay It Down First

Every Open HELOC Gets Counted, and the Rules Decide How

I hear a version of this on a lot of first calls: "I've got a line of credit on my house. Does it count against me when I buy the next one?" It does. A home equity line of credit (HELOC) goes into your debt-to-income ratio (DTI) on the next mortgage the same way your credit cards do, and what decides your file is the monthly number the underwriter attaches to that line. Four things set that number: the balance you're carrying, the payment your credit report shows for it, the loan program you're applying for, and whether you drew on the line recently. Every borrower situation is different, and with an open HELOC the differences show up in the math right away.

I spend a lot of my day onboarding and training new loan officers, and the open-line question is one I make sure gets asked on the very first call, because a HELOC is one of the few debts where two people with identical balances can be underwritten to two very different payments. If you're carrying a $40,000 balance, one lender might count a $325 interest-only payment while another counts $1,000 against a $100,000 line, and a credit report that shows no payment at all can push the count to $2,000. That's the same house and the same balance producing three different DTI results.

Where the DTI Cap Sits on a Conventional Loan

Let's say you're going conventional. The first thing I want to know on that file is the cap it's measured against, because the HELOC only matters in relation to that number. The underwriter adds the proposed payment on the new home to your other long-term debts and any significant short-term ones, then divides the total by your qualifying monthly income. Fannie Mae's Selling Guide B3-6-02 puts the ceiling for a manually underwritten conventional loan at 36% of stable monthly income, with room to 45% if you meet the guide's credit score and reserve requirements. Run the same file through Desktop Underwriter (DU), Fannie Mae's automated underwriting system, and the approval can go to 50%.

Those numbers, 36%, 45%, and 50%, are the goalposts for everything that follows. When one of our loan officers at AmeriSave looks at a file with an open HELOC, the first thing we want to know is how far the DTI sits from the cap that applies to that file, because that distance tells us whether the HELOC treatment is a footnote or the whole decision. If you're at 31% with the HELOC payment counted and DU is approving to 50%, the line is background noise. If you're at 47% and the file is a manual underwrite, the line is the file.

Two things to hold onto. First, the cap depends on how your loan is underwritten, and you typically won't know whether your file will move through DU cleanly or need a manual review until a loan officer has run it. Second, the 45% extension comes with conditions on credit score and reserves, meaning money still in the bank after closing, and the most common fix for a HELOC problem, writing a check to pay it down, comes out of that same money.

The Payment on the Balance: How a Conventional Underwriter Counts Your HELOC

The question underneath all of this comes up in a lot of different words, and it boils down to "Are they counting what I owe, or the whole line?" On a conventional file, they're counting the payment on what you owe. Fannie Mae's Selling Guide B3-6-05 says that if your HELOC carries a monthly payment, principal and interest or interest-only, the lender must include that payment in your recurring monthly debt. Your credit limit doesn't enter the calculation. A $100,000 line with $40,000 drawn is underwritten at the payment due on the $40,000, and the same line with nothing drawn is underwritten at nothing.

Now take the case where the payment isn't on the report. Some HELOC servicers report the balance to the credit bureaus without a payment amount, and the same section of the guide handles that. For a revolving account or line of credit that shows no required minimum payment, where you haven't given the lender documentation supporting a lower one, the lender must use 5% of the outstanding balance as the monthly obligation. The 5% figure is the general fallback for revolving debt, and on a HELOC it's far larger than the interest-only payment on the same balance. Your most recent statement, the one showing the required payment, is the document that keeps the underwriter on your real number instead of the stand-in, and at AmeriSave we ask for it on the first call so the file starts from your real payment.

Most HELOC rates are variable, priced off the prime rate plus a margin set in your HELOC agreement. The Federal Reserve's H.15 release put the bank prime loan rate at 7.00% as of the most recent release, so a line with a margin of 2.75 percentage points works out to 9.75% at that prime rate, and the interest-only payment moves whenever prime moves. That's the example rate I'll use in the sample file; your own margin can put you higher or lower.

One Sample File, Four Different DTIs

Let's say, on an illustrative file, you earn $9,000 a month in qualifying income, the proposed housing payment on the home you're buying is $2,100, and your other monthly debts (car, student loan, credit card minimums) add up to $550. With no HELOC in the picture, your obligations total $2,650, and $2,650 divided by $9,000 is a 29.4% DTI, which fits under every conventional cap with room to spare.

Now add an open HELOC with a $40,000 balance at the 9.75% example rate, interest-only. The monthly interest is $40,000 times 9.75%, divided by 12, or $325. Your obligations rise to $2,975, and your DTI moves to about 33%. Under the conventional payment-on-the-balance rule, that's the entire effect of the HELOC: 29.4% to 33%, still inside DU's 50% ceiling and under the 36% manual cap.

Run the same file with no HELOC payment showing on your credit report and no statement handed over. The lender applies 5% of the $40,000 balance, which is $2,000 a month. Your obligations jump to $4,650 and your DTI lands at 51.7%, over the 50% DU ceiling on the same debt that produced 33% a paragraph ago, and the only difference is whether the payment got documented.

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Now the fourth version: a lender that applies its own overlay and counts 1% of the full $100,000 line rather than the payment on the $40,000 balance. The count becomes $1,000 a month, your obligations total $3,650, and your DTI is 40.6%. The method comes from the lender's own rulebook rather than Fannie Mae's guide, and I'll come back to it below. On this file, the gap between the overlay and the balance payment is about 7.5 points of DTI, which is the gap between fitting a 36% manual cap and missing it.

The spread in that table is why I tell every new loan officer at AmeriSave to ask about open lines of credit on the first call rather than waiting for the credit report to surprise everyone in underwriting.

A Zero Balance Is the Cleanest Answer, and You Don't Have to Close the Line

If you're within a few points of the cap, the cleanest fix is a $0 balance, and Fannie Mae's guide backs that directly. Selling Guide B3-6-07 says that if a revolving account balance will be paid off at or before closing, the payment doesn't need to be included in your DTI, and the account doesn't need to be closed to get that treatment. The second half of that rule is the one I lean on most, because the question I get most often on this topic is whether the line has to be shut down before the new mortgage can fund.

Under the conventional rule, you can pay the balance to zero, keep the line open, and the underwriter excludes it, which keeps your access to the equity intact after closing and matters most when the HELOC sits on a home you're keeping as a rental or a second home. If the HELOC is on the home you're refinancing and you want it to stay open behind the new loan, your HELOC lender will also need to agree to remain in second position, which is a separate approval from the DTI question. Selling your current home to buy the next one pays the HELOC off from your sale proceeds, and it drops off the new file once that payoff is documented.

Two practical notes from watching files move through processing. First, the guide's language is "at or prior to closing," so a balance you pay down the week before closing qualifies on paper. In practice, I'd rather you have a statement showing a $0 balance before you apply, because a mid-process payoff means your loan officer has to document the payoff, source the funds, and probably re-run the file. Plan on one full statement cycle. The guide sets no day count for this; the statement-cycle buffer is my own recommendation for keeping the file moving.

Second, a $0 balance only helps if it's still $0 when the lender pulls credit again before closing, which brings up the draw problem.

A Recent Draw Changes the File, Especially If It Paid Your Down Payment

The opposite move, drawing on the line shortly before or during your application, changes the file in two ways, and Fannie Mae's guide addresses both.

The first is disclosure. Selling Guide B3-5.3-04 requires the lender to confirm you haven't obtained credit that isn't reflected on your credit report or your loan application, which lenders do by reviewing recent inquiries and refreshing your credit before closing. If a new HELOC draw shows up that wasn't on the original report, the lender must verify that debt and qualify you using the new monthly payment. So a $40,000 draw taken, say, 45 days before you apply will be on the bureaus by the time the lender refreshes your credit before closing, and it belongs on your application regardless of when it posts. The draw gets counted at its payment, and you'll be asked to document where the money went. The guide doesn't set a window in days, so my practical test is this: if the draw could appear on a credit pull between application and closing, assume it will.

The second is the down payment itself. If you're planning to draw on the HELOC on your current home to cover the down payment on the next one, Fannie Mae allows it. Selling Guide B3-4.3-15 treats borrowed funds secured by an asset, including real estate equity, as an acceptable source for the down payment, closing costs, and reserves, because the money represents a return of your own equity. The guide lets the lender exclude the payment on a secured loan from DTI only when the loan is secured by a financial asset: savings, a certificate of deposit, stocks, bonds, or a 401(k). A HELOC is secured by real estate, so the payment on the draw must be counted as a debt.

My wife's a real estate agent, and the move-up buyer who keeps the first house as a rental and draws on its HELOC for the next down payment comes up at our dinner table. The smoothest closings I've seen on that plan are the ones where the numbers were run with the draw already in the file. On the sample file, a $40,000 draw for the down payment is an acceptable source, and its $325 interest-only payment moves your DTI from 29.4% to 33%, which is manageable. Start the same file at 44% instead and the draw lands you around 47.6%, past the 45% manual cap, which you'd want to know before the draw rather than after. Keep the paper trail simple, too. The lender will want to see the draw land in your account and go straight to the closing.

The Full-Line Question: Ask Your Lender in Writing

The third method, a flat percentage of the full credit line, comes from lender overlays rather than the Selling Guide, and it's the one that can change where you should apply.

An overlay is a rule a lender adds on top of the agency guidelines to fit its own risk appetite, and counting a flat percentage of a HELOC's full line, drawn or not, is one approach some lenders take. The 1% figure in my sample file illustrates how an overlay like that works; the actual percentage is set by each lender. Under an overlay like that, your DTI stays the same whether you've paid the balance down or not, because the line itself is what's being counted. The only ways to change the number are to close the line or reduce the credit limit, which is a different game plan from the payment-on-the-balance rule, where a $0 balance solves the problem and the line stays open.

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So before you commit to a lender, ask one question and get the answer in writing: does your underwriting count my HELOC at the payment on the drawn balance, or at a percentage of the full line, and if so, what percentage? A balance-payment answer means your fix is a paid-down balance and a statement that proves it. A percentage-of-the-line answer means a different conversation about the line itself, and possibly a different lender. At AmeriSave, a Certified Approval verifies your income and credit upfront, so the HELOC treatment is settled before you shop rather than after you've written an offer.

FHA and VA Run Their Own Playbooks

Everything above is the conventional rule. If you're applying for a Federal Housing Administration (FHA) loan or a loan guaranteed by the Department of Veterans Affairs (VA), the Fannie Mae Selling Guide isn't the document your underwriter is reading. FHA underwrites to HUD's Single Family Housing Policy Handbook, VA underwrites to the VA Lenders Handbook, and each has its own section on how revolving and open-end debt is counted toward your ratios. The mechanics can differ from the payment-on-the-balance rule, so the same HELOC can land differently on an FHA or VA file than on a conventional one.

On an FHA or VA file, bring your latest HELOC statement to the first conversation and ask your loan officer to run the file under that program's handbook, with the balance, payment, and line size you actually have, before you pay anything down. The framework doesn't change: find the cap that applies to your file, measure your distance from it with the HELOC counted the way that program counts it, and act on that distance.

When to Pay It Down First, and When Not To

Every file I've talked about so far comes down to one measurement: how far your DTI sits from the cap once the HELOC is counted the way your lender and program will count it. My working rule is that if you're within about 5 points of the cap that applies to your file, paying the HELOC to zero before you apply is worth it, and you should plan for a statement showing $0 before your application goes in. At 10 or more points under the cap with the HELOC counted, the pay-down buys you very little on approval and costs you cash you might need at closing or in reserves. In between, run both versions of the file with your loan officer and look at what else in the file is tight.

Take the sample file two ways. At 33% with the $325 payment counted, you're 3 points under the 36% manual cap and 17 points under DU's 50%. If the file moves through DU cleanly, I'd leave the HELOC alone. If it's headed for a manual underwrite because of something else in the file, 3 points is too close for comfort and I'd pay it down. Same balance, two different answers, and the difference is the cap that applies, which is exactly why "my neighbor kept his HELOC open and closed fine" tells you almost nothing about your file. Your neighbor's DTI, income, and underwriting path were all different from yours. Qualifying off someone else's numbers is how you end up surprised in underwriting.

Now the other side. Say you're at 33% and you drain your savings to zero out the $40,000 line: you've traded a DTI you didn't need to fix for a reserves problem you now have. The 45% manual-underwriting extension is conditioned on credit score and reserves, and every dollar you send to the HELOC is a dollar the underwriter can't count in the bank. A pay-down funded by the sale of your current home is an easier tradeoff, since the payoff happens at the sale closing and leaves your savings alone. A pay-down that has to come from cash deserves a look at the whole file with your AmeriSave loan officer before you write the check.

One more scenario I run into: you've already paid the HELOC to zero, and you're planning to draw on it for the down payment. In that case the pay-down buys a benefit you give back the moment you draw, so run the file with the draw in it from the start.

The Bottom Line

An open HELOC doesn't have to slow your file down, but it does have to be settled before underwriting sees it, and that work happens at the front of the process. Fannie Mae's conventional rule counts the line at the payment due on what you've drawn. A $0 balance adds nothing to your DTI, and the line stays open. A credit report with no payment on it sends the lender to 5% of the balance until you hand over a statement with the real one. A draw taken around the time you apply is on the file at its payment, including a draw that paid your down payment. FHA and VA use their own handbooks, and some lenders count a slice of the full line no matter what you owe on it.

From there, the work on your side is short. Send your latest HELOC statement with your first batch of documents, so the underwriter is working from your real payment rather than the 5% stand-in. Put the full-line question to your loan officer in writing and keep the answer. Then measure the distance between your DTI, with the HELOC counted, and the cap that applies to your file. Inside about 5 points, pay the balance to zero and hold the $0 statement before the application goes in. Well under, keep your cash for closing and reserves. Where the answer on your own file isn't obvious, ask before the next step, and the HELOC becomes the one item in your file that's already resolved when you reach closing.