Adjustment Date

The adjustment date is the specific date, set out in an adjustable-rate mortgage contract, on which the loan's interest rate is recalculated against its reference index and a new rate takes effect for the following adjustment period. It marks the point at which the borrower's payment can change, subject to any rate caps written into the loan agreement.

Most ARMs set the first adjustment date several years after closing, for example at the end of a five-year or seven-year introductory period on a hybrid ARM, and then at regular intervals afterward, often annually. Lenders are generally required to notify borrowers in writing before each adjustment date, stating the new rate, the new payment amount, and how both were calculated from the index and margin.

The adjustment date is the day the clock strikes on an ARM: whatever the market index is doing on or near that date gets locked in for the next stretch of the loan. Missing the significance of that date is one of the most common ways ARM borrowers are caught off guard by a payment increase they did not plan for.

Borrowers budgeting for an ARM need to know not just the current payment but the date their payment could next change and by how much, since the gap between an introductory rate and the fully indexed rate can be substantial if market rates have risen in the meantime. Missing or ignoring an adjustment notice can leave a borrower unprepared for a higher payment that starts automatically on the adjustment date regardless of whether they acknowledged the notice in writing.

On each adjustment date, the lender adds the loan's fixed margin to the current level of the reference index, then applies any periodic or lifetime caps to limit the increase, before setting the new payment to fully amortize the remaining balance over the remaining term. Borrowers who want to avoid the uncertainty of future adjustment dates typically refinance into a fixed-rate loan before the first adjustment arrives, locking in payment certainty at the cost of giving up any chance the ARM rate might have fallen instead.

Because the first adjustment date is fixed and known from the day the loan is signed, financial advisers generally encourage ARM borrowers to mark that date well in advance and start reviewing refinancing options several months beforehand, rather than waiting for the adjustment notice to arrive before thinking about the loan's future direction.

At each adjustment date, the lender typically adds a fixed margin to the current published value of the loan's reference index, then checks the result against any applicable periodic and lifetime caps before finalizing the new rate. Borrowers can usually find both the current index value and the loan's margin stated in their original loan documents, allowing them to estimate the likely new rate before the official notice arrives.

Loans with more than one adjustment over their life, such as an ARM moving from an initial fixed period into annual resets, require borrowers to track a recurring date rather than a single event, and setting a personal reminder ahead of each anniversary is a practical way to anticipate a payment change before the formal notice lands.

Regulations in many jurisdictions require the lender's adjustment notice to be sent a minimum number of days before the adjustment date itself, often 60 or more days for the first adjustment, specifically to give the borrower enough time to plan, budget, or explore refinancing if the new payment will be meaningfully higher.

If a loan's servicing rights are sold to a different company between closing and an adjustment date, the new servicer remains bound by the same adjustment date and calculation method set out in the original loan contract, since a change of servicer does not alter the underlying terms the borrower originally agreed to.