Payment changes after an interest-only period

An interest-only period changes the timing of principal repayment. When it ends, the payment depends on the outstanding balance, applicable rate and number of amortizing payments specified by the documents. A phrase such as “30-year amortization after two years interest-only” should be resolved into an explicit schedule before the borrower budgets distributions or evaluates covenant headroom.

The key ambiguity is whether the amortization clock starts when principal payments begin or has already been running during the interest-only period. Those alternatives can produce different monthly payments with the same original balance and interest rate. A loan’s maturity is another date: a 30-year payment schedule does not mean the borrower has 30 years before the remaining balance comes due.

Establish the transition terms

The OCC’s Commercial Real Estate Lending handbook, printed page 40, treats repayment timing and amortization method as loan-structure considerations. The example here is original arithmetic, not an OCC-required term or a lender qualification standard.

Extract the final interest-only payment date, first principal-and-interest payment date, rate used for the reset, remaining payment count, maturity date and treatment of later rate changes. Also identify whether a partial paydown automatically recalculates payments or requires a separate agreement. Reducing principal and reducing the scheduled installment are different events unless the documents connect them.

For a floating-rate loan, establish whether payments recast every reset, on another schedule or only after a specified change. If the rate changes before the first amortizing payment, a model that keeps the origination rate may understate or overstate the transition. Preserve the reset notice and the lender’s actual schedule as source records.

Worked exhibit: two ways to start amortization

Assume a hypothetical $3 million loan with two years of interest-only payments, a constant 6% nominal annual rate and monthly payments. Ignore calendar-day accrual differences, fees and reserves. The interest-only payment is $15,000 per month, or $180,000 annually. Principal remains $3 million at the transition because no curtailments occur.

For an amortizing payment, use P × r ÷ [1 − (1 + r)^−n], where P is principal, r is 0.06/12 and n is the number of monthly payments in the amortization schedule. These schedules do not imply an extension of contractual maturity.

The new 30-year schedule increases the payment by $2,986.52 monthly. The remaining-clock interpretation increases it by $3,453.72. Those amounts are principal-and-interest cash changes at an unchanged interest rate; they are not evidence of a pricing increase. Figures use unrounded calculations before final display, so twelve displayed monthly payments may differ by pennies from the annualized amount.

Translate payment shock into coverage headroom

Assume accepted annual cash flow is $270,000 under a consistent hypothetical covenant definition. Coverage is 1.50× during interest-only, about 1.251× under fresh 30-year amortization and about 1.219× with 28 years remaining. If an invented minimum test is 1.25×, the first amortizing interpretation leaves only about $202.26 of annual cash-flow headroom; the second requires about $6,805.81 more cash flow.

Those are narrow cushions. At 1.25×, required cash flow is $269,797.74 for the fresh schedule and $276,805.81 for the remaining-clock schedule. A property that appears comfortably covered during interest-only may therefore be near or below its hypothetical test without any operating decline.

Do not infer a covenant breach from this illustration alone. The actual agreement may use a stressed debt-service denominator, a trailing period, annualized payments or another cash-flow definition. The point is to test both cash affordability and the documented covenant calculation, and label their differences.

Build a transition reserve without double counting

Suppose the owner wants six months of the incremental payment available before the transition. Under the remaining-clock schedule, six times the unrounded $3,453.7205 increase is $20,722.32. That is a voluntary planning target in this scenario, not a lender-mandated reserve. If cash is already restricted for another purpose, it should not also be counted as freely available transition liquidity.

The operating budget should show the entire new debt payment, not just the increment. It should also preserve taxes, insurance, capital spending and leasing obligations separately. An investor can cover the installment while still running short of cash for a tenant improvement or roof replacement.

Prepare the first twelve amortizing months before committing to a distribution near the end of the interest-only period. Reconcile the first statement to the documented payment count, reset rate and principal balance. If the expected schedule differs from the lender’s schedule, resolve it with the lender and counsel before treating a lower payment as permission to pay less. The useful outcome is a funded transition and a reproducible payment schedule, not simply the label “interest-only.”