Deferred Payment Loan Calculator

How to use the deferred payment loan calculator

This calculator estimates the financial effect of temporarily pausing scheduled loan payments. It compares the original repayment path with a deferment scenario, then shows the post-deferment payment, accumulated interest, revised payoff date, and a complete payment schedule. It is an educational model rather than a lender quote. Actual agreements may use daily accrual, fees, partial-payment rules, capitalization dates, or rounding conventions that differ from this model.

Enter the original loan details

Estimate original loan from determines whether the calculator derives the regular payment from a term or derives the remaining term from a known payment. Select Loan term when you know the remaining years and months. Select Monthly payment when your statement gives a payment but not a precise remaining term. A payment must be greater than the monthly interest charge; otherwise, the balance cannot amortize.

Loan amount / current balance is the principal outstanding on the date entered. Use the balance from a recent statement, not the original amount, when deferment begins partway through an existing loan. A higher balance generally raises the regular payment, the interest accrued during the pause, and the total repayment cost.

Date of balance anchors the schedule. Loan term is the number of remaining payment months when term-based estimation is selected. Longer terms usually reduce the regular monthly payment but increase lifetime interest. Original monthly payment is required only for payment-based estimation.

Annual interest rate is the nominal rate stated by the lender. Enter 5 for 5%. Compounding frequency controls how the nominal rate is converted into an equivalent monthly rate. Monthly compounding uses the annual rate divided by 12. Other frequencies can produce a slightly different effective monthly rate. The Consumer Financial Protection Bureau’s interest overview explains why rate and balance jointly determine interest charges.

Define the deferment

Interest treatment is the most important deferment assumption. With Capitalized interest, unpaid interest is added to principal each month, so later interest is charged on a larger balance. With Paid monthly interest, principal payments pause but the interest charge is paid as it accrues, keeping the loan balance level. With Accumulated separately, interest is tracked outside principal and divided across post-deferment payments. An Interest-free pause leaves both principal and interest unchanged during the pause. Confirm the contractual treatment before relying on the output. Federal student loan rules, for example, distinguish situations in which interest accrues from those in which it does not; the official Federal Student Aid deferment guide provides a useful illustration.

Repayment after deferment defines the restructuring method. Higher payment — original payoff date compresses repayment into the months that remain after the pause. Higher payment — term extended by pause preserves the original number of active repayment months and shifts the payoff date later. Original payment — term extended as needed keeps the pre-deferment installment and solves for a longer term. Deferment starts may be later than the balance date; payments before that date are modeled normally. Payments deferred for is the whole number of paused months. A longer pause usually increases accumulated interest and either the later payment or the payoff term.

Interpret each result

Monthly payment after deferment is the regular installment once repayment resumes. A large increase indicates that the same balance must be repaid over fewer months or that capitalization materially raised the principal. Balance after deferment is the principal entering the post-pause phase. It rises under capitalization, stays flat when interest is paid or tracked separately, and stays flat under an interest-free pause.

Interest during deferment isolates the cost generated during paused months. Zero is possible only for an interest-free pause or a zero interest rate. Additional interest cost compares the deferred scenario with the original schedule. A negative amount can occur in unusual combinations where repayment becomes much faster, but most deferments raise total interest. Deferred payoff date shows the final scheduled month after applying the selected restructuring rule.

The comparison rows show the original and deferred monthly payment, interest, total repayment, post-pause term, payment count, and payoff date. The chart plots the outstanding balance on both paths. Under capitalization, the deferred line typically rises during the pause and then declines. The schedule identifies each month as pre-deferment, deferment, or post-deferment. During a capitalized pause, principal is negative because accrued interest increases rather than reduces the balance.

How the model works

For a standard amortizing loan, the payment is based on principal, monthly rate, and number of payments. When interest is capitalized, the balance after a pause is the starting balance multiplied by one plus the monthly rate, raised to the number of deferred months. The calculator then amortizes that revised balance under the selected payment or term rule. At a zero rate, payment is simply principal divided by months. For payment-based estimation, the model solves the logarithmic payoff-period formula and uses a smaller final payment where needed.

Common mistakes include entering an original loan amount instead of the current balance, using an APR that includes fees rather than the note rate, overlooking payments made before deferment begins, and assuming every deferment is interest-free. Also check whether interest capitalizes monthly, once at the end, or not at all. The CFPB amortization explanation provides additional background on how principal and interest change over a loan’s life.

Use the export for scenario review

Download Excel creates a workbook from the current inputs and results. It includes summary, inputs, comparison, detailed schedule, and notes sheets. Export multiple scenarios to compare a shorter pause, paid-interest treatment, or a term extension. Do not treat a modeled saving or cost as guaranteed; request a written deferment disclosure from the lender and compare its payment, capitalization, fees, and payoff date with the model.