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Velocity Banking Calculator

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Free Velocity Banking Calculator

Velocity banking uses a line of credit as your cash hub to make "chunk" payments against your mortgage. Does it actually beat just paying extra principal? Enter your real numbers below and see both strategies side by side — including the LOC interest most velocity calculators quietly leave out. Everything runs right here in your browser: no signup required, and nothing is sent anywhere. Example numbers are filled in; change them to match your situation.

Your Mortgage

$
$
Principal and interest — leave escrow out.

Your Line of Credit

$
HELOCs and PLOCs are usually variable — use today's rate.
$
$1,000$25,000
How much you draw from the LOC toward the mortgage each cycle.

Your Cash Flow

$
$
Expense timing
When your money leaves the LOC matters — that's the whole strategy.

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Velocity: Debt-Free
—
Extra Principal: Debt-Free
—
Velocity: Total Interest
—
Difference

Balances over time

The sawtooth orange line is your line of credit doing its chunk-and-refill cycle. Baseline shows the mortgage with no extra payments at all.

Velocity: mortgage Velocity: line of credit Extra principal: mortgage Baseline (minimums only)

Month-by-month schedule

# Month Velocity: mortgage Velocity: LOC Extra principal: mortgage

Whichever strategy wins, the surplus is doing the work.

Undebt.it tracks every debt, every payment, and every payoff method — snowball, avalanche, and more — so your plan survives contact with real life. Free to use.

Create Your Free Payoff Plan

How this calculator works — and why it's honest

Velocity banking routes your entire financial life through a line of credit. Your paycheck deposits into the LOC and pushes its balance down, your expenses and mortgage payment draw it back up, and whenever the LOC is paid back to zero you draw a lump-sum "chunk" against your mortgage principal. Because most lines of credit charge interest on your average daily balance, the days your paycheck sits in the LOC genuinely reduce what you pay — that float is the entire mechanism.

This calculator simulates that mechanism day by day, in exact cents: daily interest accrual on the LOC, your actual paycheck schedule, your expense timing, monthly capitalization, and the mortgage payment itself flowing through the LOC (a cost many velocity calculators conveniently forget). It also refuses to declare you debt-free while money is still sitting on the line of credit — the payoff clock runs until both balances hit zero. And if your LOC balance would ever exceed its credit limit, it tells you the plan isn't workable instead of showing you numbers a real lender would never allow.

Then it runs the boring alternative with the same numbers: skip the LOC and simply add your monthly surplus to the mortgage payment as extra principal. The difference between the two results is the true value of the velocity mechanism itself — not the value of your surplus, which works just as hard either way. When the LOC rate is meaningfully higher than your mortgage rate, don't be surprised if the boring alternative wins. Prefer a strategy with less overhead? Try the debt snowball calculator to build momentum with quick wins, or the debt avalanche calculator to minimize total interest across all your debts.

Frequently asked questions

Velocity banking is a debt payoff strategy that uses a line of credit (usually a HELOC or personal line of credit) as your primary cash hub. You make large lump-sum "chunk" payments from the LOC toward your mortgage principal, deposit your full paycheck into the LOC to drive down its average daily balance, pay your living expenses from it, and repeat the cycle until the mortgage is gone.

It can shorten your payoff — but almost all of the benefit comes from your monthly surplus, not the line of credit. If you took the same surplus and simply paid it as extra principal every month, you would land in nearly the same place, often better. The LOC only adds value through paycheck float, and only when its rate is close to your mortgage rate. That's exactly the comparison this calculator shows you.

Usually not by much, and frequently not at all. When your LOC rate is several points above your mortgage rate — the normal situation for HELOCs — the interest you pay carrying chunk balances on the LOC typically cancels out or exceeds the float benefit. Direct extra principal payments have zero overhead, zero new debt, and zero required discipline beyond making the payment. Run both here and let the numbers decide.

You are converting fixed-rate, predictable mortgage debt into variable-rate revolving debt. If HELOC rates rise, your carrying cost rises with them. If your income drops or expenses spike while you're carrying a chunk on the LOC, you can get stuck paying high-rate interest with no easy exit. The strategy also demands strict discipline — every dollar of slack spending directly extends the payoff. And if you have no monthly surplus, velocity banking doesn't just fail to help; the LOC interest makes things slightly worse.

Proponents typically use a HELOC because of its size and comparatively low rate, but any line of credit works mechanically — a personal line of credit, or in aggressive variants a 0% credit card. The higher the rate on the line, the worse the math gets, which you can verify here by adjusting the LOC rate and watching the verdict flip. If you don't already have a low-rate line of credit, the cost and effort of opening one is another point in favor of simply paying extra principal.