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How to Calculate Remortgage Savings: Step-by-Step Guide

Learn to calculate potential remortgage savings by hand! Compare monthly payments, factor in fees, and understand the core formulas.

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1

Gather Your Mortgage Inputs

First things first! Collect all the details mentioned in the 'Prerequisites' section. Write them down clearly. For our worked example: * **Current Outstanding Balance (P):** £200,000 * **Current Annual Rate:** 4.5% * **Current Remaining Term (n):** 20 years (240 months) * **Current Monthly Payment:** £1,264.83 * **New Annual Rate:** 3.0% * **New Loan Term (n):** 20 years (240 months) * **Total Remortgage Fees:** £1,249

2

Calculate Your New Potential Monthly Payment

Now, let's use the monthly payment formula for the new mortgage offer. Remember: **M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]** From our example: * P = £200,000 * New Annual Rate = 3.0%, so **i** (monthly rate) = 0.030 / 12 = 0.0025 * **n** = 20 years * 12 months/year = 240 months Let's plug in the numbers: 1. **Calculate (1 + i):** 1 + 0.0025 = 1.0025 2. **Calculate (1 + i)^n:** 1.0025^240 ≈ 1.82090 3. **Calculate i(1 + i)^n:** 0.0025 * 1.82090 = 0.00455225 4. **Calculate (1 + i)^n – 1:** 1.82090 – 1 = 0.82090 5. **Calculate the main fraction:** 0.00455225 / 0.82090 ≈ 0.0055455 6. **Finally, M = P * [fraction]:** £200,000 * 0.0055455 = **£1,109.10** So, your new potential monthly payment is £1,109.10.

3

Calculate Your Monthly and Gross Total Savings

This is where the excitement builds! Now that you have both monthly payments, you can see the immediate impact. 1. **Calculate Monthly Savings:** * Current Monthly Payment - New Monthly Payment * £1,264.83 - £1,109.10 = **£155.73** per month That's £155.73 extra in your pocket every month! 2. **Calculate Gross Total Savings (before fees):** * Monthly Savings * Remaining Loan Term (in months) * £155.73 * 240 months = **£37,375.20** Over 20 years, you could save a whopping £37,375.20 just from the lower interest rate!

4

Account for Remortgage Fees for Net Savings

Almost there! While the gross savings look fantastic, remember that remortgaging usually comes with some upfront costs. It's crucial to subtract these to get your true, net savings. 1. **Recall Total Remortgage Fees:** £1,249 (from Step 1) 2. **Calculate Net Total Savings:** * Gross Total Savings - Total Remortgage Fees * £37,375.20 - £1,249 = **£36,126.20** Even after fees, your net savings over the 20-year term are an impressive **£36,126.20**! This is a significant amount that could go towards other financial goals or simply improve your monthly cash flow. ### Common Pitfalls to Avoid * **Forgetting Fees:** This is the biggest one! Always factor in arrangement fees, valuation fees, legal fees, and any early repayment charges from your current mortgage. These can significantly eat into your savings. * **Not Comparing Like-for-Like:** Ensure you compare the new deal over the *same remaining term* as your current mortgage. Extending the term might lower monthly payments but could increase total interest paid. * **Ignoring the APRC (Annual Percentage Rate of Charge):** While we focused on the initial rate, the APRC gives you a more comprehensive cost of the loan over its *entire* term, including fees. It's great for comparing different products. * **Overlooking Early Repayment Charges (ERCs):** If you're on a fixed or tracker rate, leaving early can incur a penalty. Always check your current mortgage terms. * **Not Considering Future Rate Changes:** While less relevant for fixed-rate comparisons, variable rates can change. Factor in potential future increases if you're looking at a variable product. ### When to Use a Remortgage Calculator While knowing how to calculate savings by hand is empowering, online remortgage calculators are incredibly useful for: * **Instant Results:** Get quick comparisons without manual calculations. * **Amortization Tables:** See how your principal and interest payments change over time with a detailed breakdown. * **Visual Charts:** Understand the impact of different rates and terms at a glance. * **Complex Scenarios:** Easily model different loan amounts, terms, and interest rates. * **What-If Analysis:** Quickly test various scenarios to find your optimal deal. Think of the manual calculation as your foundation, and the calculator as your advanced tool for speed and detailed analysis. You now have the knowledge to understand *how* those calculators work! Congratulations! You've successfully learned how to manually calculate your potential remortgage savings. This skill empowers you to make informed financial decisions and ensure you're getting the best deal possible. Happy remortgaging!

Hey there, future financial wizard! Thinking about switching your mortgage deal to save some money? That's a brilliant idea! Remortgaging can potentially save you thousands over the life of your loan, but how do you figure out if a new deal is truly better? While online calculators offer instant results, understanding the manual calculation gives you powerful insight and confidence in your financial decisions. Let's break down how to calculate your potential remortgage savings step-by-step.

What is Remortgaging and Why Calculate Savings?

Remortgaging simply means switching your current mortgage to a new lender or a new deal with your existing lender. People do this for many reasons: to get a lower interest rate, release equity, or consolidate debts. Our focus today is on finding a lower interest rate to reduce your monthly payments and overall costs.

Calculating your potential savings by hand helps you truly grasp the financial impact of a new deal. You'll be able to compare offers accurately and identify the best path forward, even before using a quick online tool.

Prerequisites: What You'll Need

Before we dive into the numbers, gather the following information. Think of these as your ingredients for a successful calculation:

  • Your Current Mortgage Details:
    • Outstanding Balance (Principal amount remaining on your loan)
    • Current Annual Interest Rate (as a percentage)
    • Remaining Loan Term (in years and months)
    • Current Monthly Payment (you'll use this for comparison)
    • Any Early Repayment Charges (ERCs) from your current lender (often applies if you leave during a fixed-rate period).
  • New Mortgage Offer Details:
    • New Annual Interest Rate (as a percentage)
    • New Loan Term (for a fair comparison, this should ideally match your remaining current term)
    • Any Remortgage Fees: Arrangement fees, valuation fees, legal fees, etc.

The Core Formula: Monthly Mortgage Payment

To compare deals, the most crucial step is to calculate the new monthly payment. We use a standard amortization formula for this. Don't worry, it looks more intimidating than it is!

M = P [ i(1 + i)^n ] / [ (1 + i)^n – 1]

Where:

  • M = Your Monthly Mortgage Payment
  • P = The Principal Loan Amount (your outstanding balance)
  • i = Your Monthly Interest Rate (annual rate / 12 / 100)
  • n = Total Number of Payments (remaining loan term in years * 12)

Let's put this formula to work!

Worked Example: Remortgage Savings in Action

Let's imagine you have the following scenario:

Current Mortgage:

  • Outstanding Balance (P): £200,000
  • Current Annual Interest Rate: 4.5% (0.045)
  • Remaining Term: 20 years (240 months)
  • Current Monthly Payment: £1,264.83 (We'll assume you know this)
  • Early Repayment Charge: £0 (for this example)

New Mortgage Offer:

  • New Annual Interest Rate: 3.0% (0.030)
  • New Loan Term: 20 years (240 months) – matching the remaining term for comparison
  • Remortgage Fees: £999 (Arrangement Fee) + £250 (Legal Fees) = £1,249 Total Fees

Now, let's follow our steps!

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