Your mortgage calculator - Excelergy Mortgages

Your mortgage today

Current balance (£)

Fixed rate (%)

Monthly payment (£)

Fix ends

Early repayment charge (% of balance)

If refinanced, new term (years)

Capital-and-interest, monthly compounding. Based on your current payment this tool infers interest + capital split each month; if the payment is set lower than the interest due, the balance would grow (shown as a warning).

At the end of your current fix

Balance on fix end

Interest paid during fix

Capital paid during fix

Months remaining in fix

Refinance at fix end

Projection of your balance 5 years after the fix ends, for each refi rate option. New term and the fix-end balance are used as the starting point. The lowest total paid is highlighted.

Rates to compare (comma-separated %)

Projection horizon (years from fix end)

Payment strategy

Target term remaining after refi (years)

Rate	Monthly payment	Balance at horizon	Interest paid in horizon	Total paid in horizon

Alternative: clear with pension tax-free cash (TFC)

If your pension pot is roughly four times your fix-end mortgage balance, you can crystallise just enough to generate TFC equal to the balance. The remaining 75% stays uncrystallised in your pension. This compares that cost against five years of refi payments.

Pension pot at fix end (£)

Assumed growth 2026 → fix end (% p.a.)

TFC needed to clear mortgage

Pension crystallised for that TFC

Taxable pension moved to drawdown

Opportunity cost over horizon

Growth you'd miss on that pension amount at the growth rate above