If you are wondering why your mortgage principal balance is increasing when you have been making payments, the cause is almost always one of four things: your payment isn’t large enough to cover the month’s interest charge, your servicer added missed payments or accrued interest onto the loan after a hardship, the servicer advanced money for taxes, insurance, or fees that got tacked onto what you owe, or a payment was misapplied. Each cause has a different fix, so the first job is figuring out which one you’re dealing with.
Your Payment Doesn’t Cover the Interest
Every month, your lender calculates interest on your current principal balance. If the interest charge is $1,400 and you only pay $1,100, that $300 shortfall gets added to your principal. Next month, interest is calculated on the larger balance, producing a larger shortfall. This is called negative amortization, and the Consumer Financial Protection Bureau describes it plainly: “even when you pay, the amount you owe will still go up because you are not paying enough to cover the interest.”1Consumer Financial Protection Bureau. What Is Negative Amortization?
For most mortgages originated in the last decade, this isn’t contractually possible. The CFPB’s Ability-to-Repay rule defines a qualified mortgage as one whose regular payments do not “result in an increase of the principal balance,”2eCFR. 12 CFR 1026.43 – Minimum Standards for Transactions Secured by a Dwelling and high-cost mortgages are separately barred from including “a payment schedule with regular periodic payments that cause the principal balance to increase.”3eCFR. 12 CFR 1026.32 – Requirements for High-Cost Mortgages So if your balance is genuinely growing because of insufficient payments, you likely have one of a small handful of loan types.
The most common is an option ARM, a loan that gives you several payment choices each month, including a minimum payment set below the interest-only amount. Choosing the minimum every month rolls unpaid interest into principal. Most option ARM contracts also include a recast trigger: once the balance hits a set ceiling, typically 110% or 125% of the original amount, the loan is recalculated and forces a fully amortizing payment at the current rate. That jump can be severe.
Two other products can produce a rising balance by design. FHA Section 245 graduated payment mortgages start with payments below the interest-only threshold and step up on a set schedule, so the balance climbs in the early years before leveling off. And an older adjustable-rate mortgage with a payment cap but no matching interest rate cap can produce negative amortization when rates rise: the payment cap limits how much your monthly bill can increase, but the interest charge isn’t capped the same way, and the difference is added to principal.
Check your note. If it mentions minimum payments, graduated payments, or a payment cap, you have a loan that was allowed to grow. If it doesn’t, look at the other causes below.
Forbearance or Modification Capitalized What You Missed
If you paused or reduced payments during a hardship, interest kept accruing. Six months of forbearance on a $300,000 loan at 6.5% produces roughly $9,750 in accrued interest. When forbearance ends, that accumulated amount has to go somewhere. Servicers commonly capitalize it, meaning they add it to your principal and recalculate your payment going forward. Others use a formal modification that adjusts the term or payment, or a deferral that moves the missed amount into a non-interest-bearing balance due when you sell, refinance, or pay off the loan.
FHA borrowers may have received a partial claim, which places the past-due amount into an interest-free subordinate lien. You don’t pay on it until “the last mortgage payment is made, the property is sold, the mortgage is assumed, the title to the property is transferred, or certain types of refinances.”4U.S. Department of Housing and Urban Development (HUD). FHA’s Loss Mitigation Program The first mortgage principal itself doesn’t grow, but the second lien reduces your equity.
One important protection: borrowers who received forbearance under the CARES Act on federally backed mortgages could not have interest, late fees, or penalties capitalized during the forbearance period itself. If you went through COVID forbearance and your principal jumped afterward, request a written breakdown from your servicer showing exactly what was added and when. Capitalization during the forbearance was not permitted for those loans.
Escrow Advances, Force-Placed Insurance, and Fees
Your servicer is required to advance funds from its own money to pay property taxes and insurance premiums when your escrow account runs short.5Consumer Financial Protection Bureau. 12 CFR 1024.17 – Escrow Accounts A sudden property tax reassessment or an insurance premium hike can leave the account thousands of dollars in the red. The servicer covers the bill and then bills you back, either as a lump sum or spread across a higher monthly escrow payment. The total obligation attached to your mortgage grows accordingly.
If your balance jumped and you can’t immediately identify a payment problem, start by requesting an escrow analysis. A 15% or 20% property tax increase in a single year is the most common quiet culprit.
The more dramatic version of this is force-placed insurance. If your homeowner’s policy lapses, your servicer buys coverage on your behalf at a premium that runs two to ten times higher than a voluntary policy, and the coverage typically protects only the lender’s interest in the property. Federal rules require the servicer to send a written notice at least 45 days before charging you and a reminder at least 30 days after the first notice.6eCFR. 12 CFR 1024.37 – Force-Placed Insurance If you missed those notices, the inflated premium came out of your escrow, created a large shortfall, and the servicer advanced the difference. Reinstating your own policy immediately is the fix; the excess premium may be refundable if you can show continuous coverage.
Late fees on conventional loans can run up to 5% of the principal and interest payment.7Fannie Mae. Special Note Provisions and Language Requirements On a seriously delinquent loan, property inspection fees, preservation costs, and legal expenses can also be added to the balance under standard mortgage contracts. None of these charges add value to your property, but they all raise what you have to pay to release the lien.
A Payment Was Misapplied
Sometimes the balance isn’t really growing the way your statement suggests. Servicer errors, particularly misapplied payments, can make the numbers look wrong. Common mistakes include failing to credit a payment on the date received, applying a payment to fees or escrow before principal and interest, or posting a payment to the wrong loan.
Regulation X gives you a formal way to challenge this. You can send your servicer a written notice of error identifying the problem, and the servicer must investigate and either fix it or explain in writing why no error occurred.8Consumer Financial Protection Bureau. 12 CFR 1024.35 – Error Resolution Procedures Covered errors specifically include “failure to apply an accepted payment to principal, interest, escrow, or other charges under the terms of the mortgage loan.” Send the notice to the address your servicer designates for error notices, not the general payment address. Keep bank statements showing cleared payments; that documentation is your strongest evidence.
How to Stop the Balance From Growing
Once you know why your balance is rising, the response follows from the cause.
If your loan is negatively amortizing, pay at least the fully amortizing amount each month, not the minimum. Statements that list multiple payment options label this one clearly; any amount above it reduces principal directly and cuts next month’s interest charge.
A one-time principal payment lowers the balance interest is calculated against. When you send extra money, put in writing that it should be applied to principal, not held as an advance on future payments. Fannie Mae guidelines require the servicer to apply a principal curtailment after the scheduled payment posts.9Fannie Mae. Processing a Principal Curtailment on a Recast Loan Confirm the next statement reflects the correct application.
A recast pairs a lump-sum principal payment with a lender recalculation of your monthly payment based on the new lower balance. The rate and remaining term stay the same, but the payment becomes smaller and fully amortizing, which stops the growth. Lenders typically require a minimum lump sum in the $5,000 to $50,000 range and charge a small administrative fee. Recasting isn’t available on FHA, VA, or USDA loans.
Refinancing into a fully amortizing loan is the cleanest fix if you’re stuck in an option ARM or graduated payment mortgage and have enough equity to qualify. If your balance has grown enough that you owe more than the home is worth, refinancing gets much harder, and a loan modification through your current servicer becomes the more realistic path.
A Note on the Tax Deduction
Interest that accrued during forbearance and was capitalized into your principal isn’t deductible in the year it accrued, because you didn’t pay it that year. You’ll deduct it gradually over the remaining life of the loan as part of your now-higher regular payments. The mortgage interest deduction is also capped at interest on the first $750,000 of debt ($375,000 if married filing separately) for loans taken out after December 15, 2017.10Internal Revenue Service. Publication 936, Home Mortgage Interest Deduction If capitalization pushed your balance above that threshold, interest on the excess isn’t deductible. Loans that predate the December 2017 cutoff may qualify for the older $1 million threshold; a tax professional can confirm which applies to you.