Mortgage Holiday Cost Calculator

A mortgage holiday pauses payments but not interest. 200,000 balance at 5% paused for 6 months adds roughly 5,050 in interest to the loan. The 5,050 then compounds across the remaining term. Over a 20-year remaining term at 5%, the 5,050 becomes about 13,400 of extra total cost. Helpful in emergencies; expensive if taken unnecessarily.

Quick example

With current mortgage balance of 200,000 and annual rate of 5% (plus holiday duration of 6 and remaining term of 20), the result is 5,052.37. Change any figure and watch the output shift — it's often more useful to see the pattern than to memorise the formula.

Which inputs matter most

You enter Current Mortgage Balance, Annual Rate, Holiday Duration, and Remaining Term.

What's happening under the hood

Compound interest on frozen balance for the holiday period. Lifetime cost adds interest-on-interest over the remaining term. The formula is listed in full below. If the number looks off, you can retrace the calculation by hand — that's the point of showing the working.

Stress-testing the plan

Run the calculation at your current rate, then run it again at a rate 2–3 percentage points higher. That's roughly what a product reset could bring at renewal, and it's a useful check on whether you can afford the mortgage in a higher-rate world, not just today's.

What this doesn't capture

The figure excludes arrangement fees, valuation costs, legal fees, insurance, and any early-repayment charges — those can add several thousand to the headline cost. Rate changes at renewal for fixed-term deals will shift the picture further. Use this for the core interest/principal math and add the other costs on top.

Worked example with realistic figures

Suppose a borrower has a mortgage balance of 180,000 at an annual rate of 4.5%, and takes a 4-month holiday with 18 years remaining on the loan. The calculator estimates the additional interest cost during the holiday period at approximately 2,700. Because this unpaid interest is added to the balance, it then accrues its own interest over the remaining 18 years, pushing the total lifetime cost to around 6,200. This illustrates how a short pause in payments can extend the cost of borrowing well beyond the holiday period itself.

Scenarios where this metric matters

• Job loss or income reduction: understanding the cost before entering a holiday arrangement
• Comparing a holiday against other options: early withdrawal from savings, personal loan, or reduced mortgage payments
• Planning a temporary cash-flow shortfall: hospital stay, redundancy notice period, or business downturn
• Evaluating a lender's offer: some deals include free holidays; others charge arrangement fees on top of interest

What the result shows and what it does not

The calculator models the additional interest that accrues during and after the holiday. It shows how a frozen balance compounds over time. It does not account for:

• Lender arrangement or processing fees for the holiday itself
• Changes to the interest rate during the remaining term
• Payment shortfalls if the holiday is extended beyond the agreed period
• Changes to credit reports or lending eligibility
• Tax or regulatory treatment of accrued interest in your location

Educational illustration

This calculator estimates interest costs for educational purposes. Results are based on the inputs provided and standard compound-interest formulas. They do not forecast actual lender behaviour, rate movements, or personal financial outcomes. Use the output as one data point in a broader decision about payment arrangements.