Cordwell

Popular: Paycheck · Mortgage · Income tax · Retirement · Auto loan

Velocity Banking Calculator

Test whether running your mortgage through a HELOC actually beats paying the same money straight to principal.

Your numbers

Everything else you pay each month: groceries, utilities, insurance, car, childcare.
Most HELOCs are variable. Use the rate on your offer.
Each block goes to the mortgage; a new one is drawn when it is paid back.
Points added to the HELOC rate after the month below.

Nothing you enter is sent or stored.

Result

…

Verify before you act: review these results with a licensed loan officer or a HUD-approved housing counselor before making any decision based on them.

What is velocity banking?

Velocity banking is a mortgage payoff method that uses a home equity line of credit (HELOC) like a checking account. You draw a block from the HELOC, send it to the mortgage as an extra principal payment, deposit each paycheck into the HELOC, pay your bills from it, and draw the next block once the last one is paid back.

Supporters say the HELOC lets you pay principal sooner, so each month's mortgage interest is figured on a smaller balance. That part is true. What the pitch usually leaves out is that the block is borrowed money: it lowers the mortgage by exactly the amount it adds to the HELOC, and the HELOC charges interest every day that block is outstanding.

Why the math matters before you open a HELOC

A HELOC is secured by your home and usually has a variable rate, so payments can change from month to month. The lender can also freeze or reduce the line if your home's value falls or your finances change, according to the Consumer Financial Protection Bureau.

Because the strategy moves debt from a fixed-rate mortgage to a variable-rate line, the only lasting gain comes from the difference between the two rates and the few days your paychecks sit on the line. This calculator measures that gain against the simplest alternative: sending the same monthly surplus straight to the mortgage.

How to use this velocity banking calculator

  1. Enter your mortgage balance, rate and the years left on the loan.
  2. Enter your monthly take-home pay and everything you spend in a month other than the mortgage payment. The difference, after the mortgage payment, is your monthly surplus.
  3. Enter the HELOC rate from your offer, the block size you plan to draw, and the HELOC's setup costs and annual fee.
  4. Test a rate rise: add points to the HELOC rate and pick the month it starts.
  5. Enter the rewards rate on the card you'd use for everyday bills to see the cards-plus-surplus plan.
  6. Compare total cost and payoff time for all four plans, then check the chart: the dashed line is the mortgage by itself, the solid lines are total debt.

Example: a $300,000 mortgage at 7.32%

Worked example

A household owes $300,000 at 7.32% with 30 years left, takes home $8,000 a month and spends $4,104 outside the mortgage. Sending the surplus to principal pays the loan off in 8 years 9 months with $106,380 of interest. Velocity banking with $10,000 blocks from an 8.14% HELOC pays it off in 8 years 8 months with $101,249 of mortgage interest plus $3,930 of HELOC interest, a total of $105,179. That is $1,201 less before HELOC fees, which can use up most of that gain. The 30-year payoff became less than 9 years because of the surplus, not the HELOC.

How to read your results

The headline compares velocity banking with plain extra payments, after HELOC interest and fees. A small saving means the HELOC is adding risk for little reward; a cost means you would do better without it.

Watch total debt, not the mortgage balance alone. Each block makes the mortgage look smaller, but the same amount appears on the HELOC. Only money you earn and don't spend lowers what you owe in total.

If the HELOC never gets paid back, your spending and mortgage payment use up all of your take-home pay. Fix that first: no payoff method works without a surplus.

How to pay off a mortgage faster

  1. 01

    Grow the monthly surplus

    Every extra dollar sent to principal lowers next month's interest and every month after. Raising the surplus does far more than any account structure.

  2. 02

    Pay bills by card and the card in full

    Purchases paid in full by the due date are not charged interest, so your checking account holds a cushion you can send to principal once, and rewards can go to principal every month.

  3. 03

    Refinance when the rate gap is large

    If rates fall well below your mortgage rate, refinancing lowers the interest on the whole balance, not just a block. Compare closing costs with the monthly saving first.

  4. 04

    Keep an emergency fund separate

    Extra principal can't be withdrawn without borrowing. Keep a few months of expenses in savings so a job loss doesn't land on a variable-rate line secured by your home.

Common velocity banking mistakes

  • Thinking the HELOC is interest-free if paid fast

    HELOC interest accrues every day there is a balance. A block that takes weeks to pay back costs interest for every one of those days.

  • Using cash advances

    Card cash advances usually start charging interest the day you take them, at a higher rate, plus a fee. They are the most expensive way to fund a block.

  • Ignoring a rate rise

    Most HELOCs are variable. Test a higher rate before you start, because the strategy runs for years.

  • Letting spending grow

    Running bills through a credit line makes overspending easy. Any month spending rises, the line grows instead of shrinking.

The velocity banking formula

The calculator runs four plans on the same household, day by day. Standard: the scheduled payment only. Extra payments: whatever is left after spending and the mortgage goes to principal at month end. Velocity banking: paychecks go into the HELOC, spending comes out of it, and a block is sent to the mortgage whenever the last block has been paid back; the HELOC charges interest daily on its balance. Cards plus surplus: spending goes on a card paid in full each month, the one-month float is sent to principal once, and rewards go to principal monthly.

Mortgage interest each month = balance after the last payment x annual rate / 12. HELOC interest each day = HELOC balance x HELOC rate / 365. Total cost = mortgage interest + HELOC interest + HELOC fees.

Key terms

HELOC
Home equity line of credit: a revolving line secured by your home, usually with a variable rate.
Block
The lump sum drawn from the HELOC and sent to the mortgage as extra principal.
Monthly surplus
Take-home pay minus spending and the mortgage payment. It is the money that actually pays debt down.
Grace period
The time between a card statement and its due date when purchases paid in full are not charged interest.

Velocity banking questions

Does velocity banking work?

It can shorten a mortgage, but almost all of the speed comes from the monthly surplus. The HELOC only changes which loan carries the debt, so it helps only when the HELOC rate is clearly below the mortgage rate after fees.

Is a HELOC paid off before interest is charged?

No. HELOC interest accrues every day there is a balance, so a block that takes weeks to pay back costs interest for every one of those days.

Can I use a credit card instead of a HELOC?

Not for the mortgage itself. Mortgage servicers generally do not take cards, and cash advances start charging interest the day you take them. Paying your normal bills by card and paying the card in full is the version that works.

What is the biggest risk?

A HELOC is secured by your home and usually has a variable rate. If income drops or rates rise while a block is outstanding, the strategy can cost more than it saves, and the lender can freeze or reduce the line.

Is velocity banking a scam?

No, but it is often oversold. It can shorten a mortgage, yet almost all of the speed comes from the monthly surplus. The HELOC adds a small gain at best when its rate is below the mortgage rate, and a loss when it is above.

Does paying principal early reduce interest?

Yes. Mortgage interest is charged on the balance after each payment, so principal paid early lowers every later month's interest. The question is whether borrowing to pay it early costs less than it saves.

What happens when the HELOC draw period ends?

You can no longer draw, and the required payment can rise sharply. Some plans require the full balance at the end, according to the CFPB.

Sources

Before you act on this result. Cordwell calculators and guides are educational estimates, not legal, tax, investment, lending or other professional advice. They rely on the numbers you enter and on simplified rules, and they can't see your full situation. Before you file, sign, borrow, invest, hire, change your withholding or form a business based on anything here, meet with a licensed loan officer or a HUD-approved housing counselor who can review your specific facts and confirm the numbers. Rules change, and official agency guidance always controls.

How we write and check these pages.

Related calculators