An interest-only mortgage lets you pay interest without scheduled principal payments for an agreed period. When that period ends, you must repay the balance according to the loan terms. The initial payment is lower than a fully amortizing payment at the same balance and rate, but more debt remains to repay later.
Key Takeaways
- Interest-only payments cover interest without scheduled principal reduction for the agreed period.
- Equity can still change through your down payment, extra principal payments and property value.
- Later payments can rise when principal repayment begins, even with a fixed rate.
- Compare the full cost and maintain a repayment plan that does not depend on a future sale or refinance.
The key comparison is what you owe and can afford across the full repayment schedule. This guide explains the payment calculation, shows a five-year example, and separates principal repayment from rate changes and changes in home equity.
How does an interest-only mortgage work?
An interest-only mortgage loan separates the repayment schedule from the interest-rate schedule. You pay interest for a set period without scheduled principal payments. The loan agreement determines the length of the interest-only period, when principal repayment begins and how long you have to repay it.
Principal, interest and equity
Principal is the money you owe. Interest is the charge for borrowing it. Paying all the interest due normally leaves the principal balance unchanged. Your equity is the home's value minus the debt secured by it, so a down payment, extra principal payments or changes in home value can affect equity even during the interest-only phase.
A falling property value can reduce equity. Appreciation is uncertain, and the lower required payment does not build equity through scheduled principal reduction.
Fixed rate or adjustable rate
An interest-only loan can have a fixed interest rate or an adjustable rate. With a fixed rate, the payment can still rise when principal repayment starts. With an adjustable-rate mortgage, a rate reset can create a separate increase, potentially before the interest-only period ends. Use our mortgage calculator to compare an amortizing payment; it does not model the interest-only period.
For an ARM, review the index, lender margin, adjustment dates, caps and any floor. An ARM label tells you about rate adjustments; it does not tell you whether the payments are interest-only. Read both schedules together.
Interest-only loan vs. traditional mortgage: payment example
For a monthly estimate, multiply the outstanding loan balance by the annual note rate and divide by 12. Actual interest accrual follows the mortgage note. Taxes, homeowners insurance, flood insurance where required, and association dues remain additional housing expenses.
Hypothetical illustration
$500,000 loan · 6% fixed annual note rate · 30-year total term
Assume five interest-only years, followed by 25 years of principal and interest payments, with no extra principal payments.
Years 1–5
$2,500.00/month
$500,000 × 0.06 ÷ 12. All 60 payments cover interest. The balance at the end of year five is still $500,000.
Years 6–30
$3,221.51/month
The same balance must now be repaid over 300 months. The payment rises about $721.51, or 28.9%, even though the rate stays at 6%.
Traditional mortgage comparison
$2,997.75/month
A fully amortizing 30-year fixed-rate mortgage at the same balance and rate includes principal from the start. Its balance after five years is about $465,271.78.
The interest-only structure leaves about $497.75 more cash each month during the first five years, but about $34,728 more debt at that point. If both loans run to maturity under these assumptions, total interest is approximately $616,452 with the interest-only period versus $579,191 with immediate amortization.
These are rounded mathematical examples, not current mortgage rates, a loan offer or an APR. Figures exclude fees, closing costs, taxes, insurance and association charges. Interest-only and fully amortizing loans can have different rates and fees; this example holds the rate constant to isolate the repayment feature.
An amortization schedule shows how each payment is divided between principal and interest and the mortgage balance that remains. During the interest-only term, scheduled payments leave that balance level.
You pay more interest over time in this example because you keep the full amount borrowed outstanding for longer. The lower initial payment represents postponed principal repayment. Compare the outstanding balance and total interest as well as the monthly payment. A mortgage payment calculator should show the remaining repayment term, not assume that another 30 years starts after the interest-only period.
What happens when the interest-only period ends?
On a loan that becomes fully amortizing, the remaining balance is repaid over the months left in the term. A balloon loan instead requires the unpaid balance as a lump sum at the contractual maturity date. The end of an interest-only period does not automatically mean a balloon payment is due.
Check the interest-only end date, first principal and interest payment and final maturity date separately. For a longer initial period, our 10-year interest-only mortgage guide compares 10-year payment structures in detail.
You might refinance or sell before the change, but either option depends on your finances and market conditions at that time. The CFPB's interest-only loan guidance cautions against relying on a future sale or refinance to afford the debt.
Compare your repayment options
| Repayment option | What it requires | What to check |
|---|---|---|
| Keep the loan and repay principal | A loan that switches to principal and interest payments, plus the income and reserves to make them. | The first amortizing payment and remaining loan term. A balloon balance requires a separate payoff plan. |
| Pay extra principal earlier | Available cash and correct application of additional payments to principal. | How the lower balance changes interest charges and later installments, while keeping enough cash for reserves. |
| Refinance the mortgage loan | Approval for a new loan based on your finances, property value and available mortgage terms at that time. | Closing costs, the new rate and repayment term. A lower payment over more years can still mean a higher total cost. |
| Sell and pay off the balance | A completed sale and enough funds to cover the mortgage payoff and selling costs. | The amount you would owe if the sale price falls or the property takes longer to sell. |
Explore Interest-Only Mortgage Financing
Discuss financing options for your property and financial goals.
- Loan Options
- Estimated Payments
- Property Review
Refinancing is a new borrowing decision, not an automatic extension of the interest-only period. Our guide to refinancing costs and break-even explains how to compare a new loan with keeping the existing one.
Pros and cons of an interest-only mortgage
The lower initial payment leaves more cash available now, but the principal still has to be repaid. Weigh these advantages and disadvantages against the full payment schedule.
Advantages
- Lower initial payments: At the same loan amount and rate, deferring principal reduces the required loan payment.
- Cash available for other needs: Retained cash can support reserves, repairs or business expenses. Decide how you will use it before borrowing.
- Income-timing flexibility: A borrower with documented seasonal or commission income may value a lower required payment between stronger earning periods.
- Optional principal reduction: Extra payments can reduce the balance when permitted and correctly applied. Confirm how they affect future required payments.
Disadvantages
- Payment shock: Adding principal over a shorter remaining term can raise payments substantially, with or without a rate increase.
- More debt remains: Scheduled interest-only payments leave the balance unchanged. A price decline can make selling or refinancing harder.
- Higher interest costs: Delaying principal reduction generally means more interest at otherwise identical rates and terms. Compare actual quotes and fees.
- Uncertain exit: A planned refinance, sale or future income increase may not happen. You still need a workable repayment plan.
Interest-only payments are different from negative amortization. A rising ARM rate does not by itself increase principal when the required payment covers the interest due. Negative amortization occurs when unpaid interest is added to the balance because payments do not cover the interest due.
How to qualify for an interest-only mortgage
Lenders review the borrower, property and repayment plan. There is no universal credit score, down payment, debt-to-income ratio or reserve requirement across all interest-only mortgage programs. The qualifying payment can be higher than the initial interest-only payment.
Prepare for the lender's review
- Income and debts: Provide the documentation required by the selected program, such as pay records, tax returns or eligible alternative income records.
- Assets and reserves: Document funds for closing and the cash available afterward, including resources for the later payment.
- Credit history: Review existing obligations and any credit issues before comparing programs.
- Property and occupancy: Identify whether the home is a primary residence, second home or investment property. Eligibility differs.
- Down payment or equity: Confirm the lender's loan-to-value limit for the specific transaction and property.
For consumer mortgages covered by Regulation Z, interest-only features do not remove ability-to-repay requirements. The interest-only qualifying-payment rule uses the greater of the fully indexed rate or introductory rate, and a principal and interest payment that repays the loan over the term remaining after the interest-only period. Loans made primarily for business purposes have a different regulatory scope; an investment-property label alone does not settle how the rules apply.
Interest-only, non-QM and other mortgage options
Interest-only describes the repayment feature. For a consumer mortgage covered by the standard Qualified Mortgage rules, deferring scheduled principal repayment means the loan does not meet those QM product requirements. Non-QM does not mean the lender can skip ability-to-repay requirements. Jumbo describes loan size relative to conforming limits, independently of how payments are structured.
For a home loan, separate the repayment feature from the documentation method when comparing mortgage options. If predictable principal reduction is your priority, compare a fully amortizing 30-year fixed mortgage. If your main concern is how income is documented, review non-QM loan options separately from the payment feature. For Florida availability and the broker's review process, see our Florida interest-only mortgage options.
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Questions to answer before choosing the loan
Start with the payment you would face if you keep the property beyond the interest-only period. Then compare it with your current resources and other obligations. Borrowing more because the first payment looks manageable can leave too little room for the later increase.
- What will I owe after the interest-only period? Request the initial payment, first amortizing payment, remaining balance and any balloon amount in writing.
- How do the mortgage quotes compare? Use the same mortgage loan amount, occupancy, term and rate-lock period. Review the note rate, APR, points and other closing costs together. Our mortgage glossary explains these cost terms.
- Could I afford a higher monthly payment? Test lower income, higher ownership costs and, for an ARM, rate increases allowed by the contract.
- What is my backup repayment plan? Decide how you would make payments if you cannot refinance or sell when expected.
For a loan that uses a Loan Estimate, review the Projected Payments section alongside the loan terms and closing costs. Include taxes and insurance, plus any expenses paid outside escrow, when testing your housing budget.
At Bennett Capital Partners Mortgage Brokers, we help Florida homebuyers understand their mortgage options. Bring your property details, income documentation and expected ownership period so we can compare available structures for your situation. The lender makes the final approval decision.
Interest-only mortgage FAQs
How much is an interest-only payment on a $200,000 mortgage?
At a hypothetical 6% annual note rate, the monthly interest estimate is $200,000 × 0.06 ÷ 12 = $1,000. If that fixed-rate loan has five interest-only years followed by 25 repayment years, the later principal and interest payment is about $1,288.60. A fully amortizing 30-year mortgage at the same balance and rate is about $1,199.10 per month from the start. These examples exclude taxes, insurance, fees and association charges.
Can I make extra principal payments during the interest-only period?
Ask the servicer how to direct extra money to principal and how it changes subsequent bills. Do not assume a principal payment automatically lowers a fixed required installment. For consumer interest-only mortgages covered by Regulation Z's ability-to-repay rule, prepayment penalties are not permitted. Loans made for business purposes can have different provisions, so review the note and applicable rules before a large payment or early payoff.
Is a 30-year interest-only mortgage interest-only for all 30 years?
Not necessarily. The 30-year label can describe the total loan term while the interest-only payment period lasts only part of it. Confirm both durations and whether a balloon balance is due at maturity. In the example above, five interest-only years leave 25 years for principal repayment.
Does a lower interest-only payment mean I qualify for a larger loan?
Not necessarily. The lender's qualifying payment, income review, debts, assets and property requirements determine eligibility. For a covered consumer interest-only loan, underwriting considers principal repayment rather than relying only on the first interest-only payment.
What happens if I sell during the interest-only period?
Normally, the mortgage is paid off as part of the sale. If you have made no principal payments, the principal balance generally remains the original amount. The payoff can also include accrued interest and applicable charges. Your net proceeds depend on the sale price, other liens and selling costs.
Is an interest-only mortgage a good idea?
It depends on whether the full repayment schedule fits your resources and plans. Consider the later payment, adequate reserves and a specific use for the cash retained each month. A future raise or stronger business year is uncertain. If you need that income increase or a successful refinance to afford principal repayment, compare other mortgage options before borrowing.
Can I refinance an interest-only mortgage into a traditional mortgage?
You may be able to refinance into a fully amortizing mortgage, but you must qualify for the new loan. The lender reviews your finances and property under its current requirements. Compare closing costs, the new monthly payment and total repayment period. Rolling costs into the loan increases the balance, and restarting a longer term can increase total interest even if the payment falls.
What if my home value falls and I cannot refinance or sell?
A decline in value reduces your equity while scheduled interest-only payments leave the principal unchanged. You remain responsible for the existing repayment schedule, including any principal and interest payments or balloon balance. Keep cash reserves and a plan that works without a sale or refinance. Contact your servicer promptly if you expect trouble making payments.
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Sources & Further Reading
Interest-only loans and repayment choicesConsumer Financial Protection Bureau · Initial payments and the risk of relying on a sale or refinance
When unpaid interest increases the loan balanceConsumer Financial Protection Bureau · Negative amortization explained
Ability-to-repay, Qualified Mortgage and prepayment rulesConsumer Financial Protection Bureau · Regulation Z § 1026.43(a), (c)(5)(ii)(B), (e)(2)(i) and (g)
How business-purpose credit is treatedConsumer Financial Protection Bureau · Regulation Z § 1026.3(a) and its official commentary
Review your Loan Estimate and projected paymentsConsumer Financial Protection Bureau · Payments, ownership expenses and closing costs
Questions to ask before refinancingConsumer Financial Protection Bureau · Refinance costs, goals and repayment-term tradeoffs; September 2020
10-year interest-only mortgage guideBennett Capital Partners Mortgage · Further reading on a longer interest-only period
