Mortgage Extra-Payment Accelerator

Extra principal on a mortgage is leverage: a dollar sent in year two kills more interest than a dollar sent in year twenty. But how much more — and how many YEARS does your extra actually cut? This accelerator starts from your real balance and your real payment (not the day-one loan) and prices four acceleration plans side by side: keep going as-is, add extra monthly, add extra plus an annual lump sum, or use the biweekly equivalent — one extra payment a year, spread monthly.

What it does for you:
– Start Here — 5-minute setup: current balance, APR, your actual monthly payment, extra per month, annual lump sum and next payment date.
– Acceleration Scenarios — four plans compared: Months Left, Years Cut, Payoff Date, Total Interest From Now and Interest Saved vs your current plan, all calculated with exact amortization math.
– Annual lump, fairly compared — the lump sum is spread as a monthly equivalent (lump / 12) so plans compare apples to apples, and the sheet says so.
– Extra Payment Log — log extra principal you actually send (monthly extra, lump sums, bonuses) so plan and reality stay comparable.
– Expense Log — log everyday spending once; the budget reads it automatically.
– Monthly Budget — zero-based monthly budget with property tax, home insurance and maintenance categories built in.
– Dashboard — months left on your current plan vs your plan, years cut, interest saved and payoff date at a glance.
– Monthly Summary — 12 months of extra payments in one view.
– Sample rows pre-filled ($320,000 balance at 5.5%, $1,950/month: extra + lump finishes in 214 months instead of 306 — 7.67 years cut and $91,980.16 of interest saved) so every formula works the moment you open it; formula cells are locked (password disclosed in Start Here) and every formula is error-wrapped. A tracking and planning tool, not financial advice.

What’s inside (.xlsx, works in Excel AND Google Sheets): Start Here · Acceleration Scenarios (4 plans) · Extra Payment Log · Expense Log · Monthly Budget (zero-based) · Dashboard · Monthly Summary (12 months).

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