Velocity banking uses a line of credit to make lump-sum 'chunk' payments against your mortgage while your income parks in the LOC to hold down interest. This calculator models it with your own numbers — mortgage, line of credit, income, expenses, chunk size — and then does the thing most velocity calculators won't: it shows the same plan against just making minimum payments and against paying the same surplus straight to principal, so you can see exactly where the strategy helps and where it doesn't.
The magic isn't the line of credit.
It's the math — so here's the math.

One engine, three scenarios on the same inputs — because the honest comparison is the whole point.
Mortgage balance, rate, and payment; your line of credit's limit and rate; monthly income and living expenses; the chunk size you'd use.
The sheet takes a chunk from the LOC, drops it on the mortgage principal, funnels your surplus to pay the LOC back down, then chunks again — month by month to payoff.
The baseline: what the mortgage costs and how long it takes if you change nothing. Usually the difference is dramatic.
The honest control — the same surplus paid straight to the mortgage, no LOC. This is the comparison that tells you what the line of credit is really doing.
If your LOC rate is above your mortgage rate, or your cash flow isn't positive, the sheet warns you — the two conditions where velocity banking stops making sense.
Velocity banking's real value is liquidity, forced discipline, and a revolving safety net. The sheet shows you the dollar cost of that — so you can decide if it's worth it for you.
The velocity-banking math, run on your numbers and compared honestly — so you decide from the real picture, not a sales pitch.
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