A non-interest bearing principal balance on a mortgage is a portion of what you owe that your lender has set aside from the main loan and stopped charging interest on. You still owe the full amount, but no interest accrues on that piece and your monthly payments do not reduce it. It comes due in a lump sum when you sell, refinance, pay off the active balance, or reach the end of your loan term.
How the Split Balance Works
When a lender creates this arrangement, your total debt is divided in two. The first piece is the active, or interest-bearing, balance. It behaves like a normal mortgage: monthly payments cover interest and reduce principal. The second piece is the deferred balance. It sits on the lender’s books without growing, and your regular payments do not touch it.
The deferred amount is still legally secured by your home, either under the original mortgage or under a modified agreement. The lender keeps the right to collect the full amount later. In the meantime, interest is calculated only on the smaller active balance, which is what lowers your monthly payment.
Why You Have One
A non-interest bearing balance almost always shows up after a hardship-related adjustment to your loan. Which program created yours depends on who owns or insures the mortgage.
COVID-19 Payment Deferrals
The most common source today is a COVID-19 payment deferral. Borrowers who exited forbearance had their missed payments moved to the end of the loan instead of being required to catch up all at once. Freddie Mac’s program allowed deferral of up to 18 monthly delinquent amounts, rolling missed principal, interest, and escrow advances into a single non-interest bearing balance due at maturity, payoff, or sale.1Freddie Mac. COVID-19 Hardships: Seamlessly Transition After Forbearance Fannie Mae offered an equivalent option with the same repayment triggers.2Fannie Mae. Loss Mitigation If you went through forbearance between 2020 and 2023 and then resumed normal payments, this is likely what happened on your account.
Flex Modifications
Fannie Mae and Freddie Mac Flex Modifications handle ongoing hardship through a sequence: the servicer capitalizes past-due amounts, reduces the interest rate, extends the term, and, if the payment still is not affordable, forbears part of the principal.3Fannie Mae. Flex Modification The forborne principal becomes the non-interest bearing balance. Freddie Mac caps principal forbearance at 30% of the post-capitalized unpaid principal balance, so on a large loan the deferred piece can be substantial.
FHA Partial Claims
If your loan is FHA-insured, your servicer may use a partial claim instead. Past-due amounts are placed into a separate, interest-free subordinate lien on your property. You make no monthly payments on it, and it becomes due when you make your final mortgage payment, sell, refinance, or transfer title.4HUD.gov. FHA’s Loss Mitigation Program The lien is technically held by HUD rather than carved out of the original mortgage, but from your side it works the same way: a deferred balance you owe later.
Older HAMP Modifications
The Home Affordable Modification Program, launched by the Treasury Department in 2009 and now expired, used principal forbearance with no interest accruing on the forborne amount as one of its tools.5Treasury.gov. Home Affordable Modification Program Guidelines If your deferred balance dates to a HAMP modification, it has been sitting untouched for a decade or more and will stay there until one of the triggering events below.
When the Deferred Balance Comes Due
This is the point that catches people off guard. A non-interest bearing balance is not forgiven debt. It is real money you owe, and your lender has specific rights to collect it.
- Loan maturity. When your mortgage reaches its final scheduled payment, the entire deferred balance is due as a lump sum.
- Sale or transfer of the property. Selling triggers immediate payoff. The title company identifies the deferred balance during closing and pays it from your sale proceeds before you see any equity.
- Refinancing. A refinance satisfies the old loan in full, deferred portion included, which turns that portion into a balloon payment at the refinance closing.
- Payoff of the interest-bearing balance. Paying off the active mortgage ahead of schedule also triggers the deferred amount, even without a formal refinance.
Fannie Mae’s servicing guide states that deferred amounts are “due and payable at maturity of the mortgage loan, or earlier upon the sale or transfer of the property, refinance of the mortgage loan, or payoff of the interest-bearing UPB.”6Fannie Mae. Payment Deferral Freddie Mac uses identical language.1Freddie Mac. COVID-19 Hardships: Seamlessly Transition After Forbearance
What It Does to Your Monthly Payment
Lowering the monthly payment is the whole point. Interest is calculated only on the active balance, not on the deferred piece. If your total debt is $250,000 but $40,000 has been deferred, interest accrues on $210,000. At a 5% rate, that difference is roughly $167 per month in interest alone.
Your monthly payment covers interest and principal reduction on the active balance only. The deferred portion does not amortize, does not shrink, and does not appear in your payment breakdown. It sits at its original amount until a triggering event occurs.
What It Does to Your Home Equity
Your usable equity is not simply market value minus your active mortgage balance. The deferred balance has to come out too, because it gets paid at closing.
Say your home is worth $320,000, your active balance is $220,000, and you have a $35,000 non-interest bearing deferred balance. The gross equity looks like $100,000 if you overlook the deferral. Your actual net equity after paying off both balances is closer to $65,000, and closing costs and real estate commissions pull it lower still. Before you list, request a payoff statement from your servicer that includes the deferred balance, so the number at the closing table is not a surprise.
If the sale proceeds are not enough to cover both balances, you have a potential shortfall. Whether the lender can pursue you for the difference depends on whether your loan is recourse or nonrecourse and on your state’s deficiency laws. Talk to an attorney before agreeing to a sale at a loss.
Credit Reporting and Taxes
The deferred balance itself does not damage your credit score. Any damage to your credit usually happened earlier, from the missed payments that led to the modification. Once the deferral is in place and you make on-time payments on the active balance, the account should report as current.
The deferred amount still shows up on your credit report as part of your total outstanding mortgage debt, and some lenders count it in your debt-to-income ratio when you apply for new credit, even though you make no monthly payment on it.
Deferring principal is not a taxable event. Nothing has been forgiven, so there is no cancellation of debt to report. Your lender will keep reporting the full outstanding principal on Form 1098 each year, and your deductible mortgage interest is based on the interest actually charged on the active balance.
The tax picture only changes if the deferred balance is ever forgiven, which lenders rarely do voluntarily. Canceled debt is generally taxable ordinary income in the year of cancellation. A federal exclusion for canceled qualified principal residence indebtedness applied only to debt discharged before January 1, 2026, or discharged under a written arrangement entered into before that date.7Internal Revenue Service. Topic No. 431, Canceled Debt – Is It Taxable or Not? If you receive a Form 1099-C showing canceled debt, take it to a tax professional before you file.
What to Check in Your Own Paperwork
Read your modification agreement or deferral documents. They spell out the exact deferred amount, the triggering events, and any conditions that could change the arrangement. If you cannot find your copy, your servicer must provide one on request.
Look specifically for whether the deferred balance can be re-amortized or modified again if you hit another hardship. Some agreements are rigid; others include provisions for additional loss mitigation.
Request a payoff statement at least once a year, and always before a refinance, sale, or major financial decision involving the home. The payoff statement is the only document that shows your complete obligation, active balance and deferred amount together, calculated to a specific date. The gap between what your monthly statement shows and what you actually owe can run into tens of thousands of dollars.