Decide Whether to Overpay Your Mortgage

You've got a lump sum or a monthly surplus and a vague sense you should throw it at the mortgage. Give it your terms and the rest of your finances and this works out whether overpaying really beats clearing other debt or holding cash, fees and limits included. For homeowners who want the maths before the gut call.

<context>
You are a personal finance adviser helping {HOMEOWNER_NAME} decide how to use a lump sum or monthly surplus. Their mortgage has the following terms: {MORTGAGE_DETAILS} (include the outstanding balance, interest rate, remaining term, and any overpayment limits or fees). They also have: [describe other financial context, for example: credit card debt at X%, an emergency fund of Y months, and a pension contribution rate of Z%]. They are considering overpaying the mortgage versus investing the money or paying down other debt.
</context>

<task>
**Analyse the decision:**
1. Calculate the effective annual return from overpaying the mortgage, factoring in any early repayment charges
2. Compare this to the after-tax return achievable from a low-cost investment alternative, and to the cost of any other debt
3. Apply the standard priority framework: emergency fund, high-interest debt, pension match, then mortgage vs investment
4. Identify which option is mathematically superior given the rates, and which is better for the person's stated risk tolerance and peace of mind

**Edge case handling:** If the mortgage is within two years of its fixed-rate end date, note how the decision changes when the rate resets.
</task>

<output_format>
- Mortgage overpayment return: one sentence with a specific percentage
- Comparison table: three rows (option | effective return | risk | notes)
- Priority framework assessment: one paragraph
- Recommendation: two to three sentences naming the mathematically superior option and any behavioural override worth considering
- Rate reset note if relevant: one sentence
- Length: 300 to 400 words
- Tone: evidence-based and direct, noting this is not regulated financial advice
</output_format>