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A line of credit doesn't pay off your home. Your cash flow does.

Is a HELOC sweep better than paying extra on my mortgage?

Usually not by itself. Given the same monthly cash, a mortgage at a lower rate costs less interest than a line at a higher rate. A HELOC sweep wins when the rate gap is small, your income arrives in lumps, or you value keeping paid-down cash within reach. Run your numbers below.

The honest line-of-credit payoff calculator. Both sides get the same cash every month, so the result shows what the line really does, not what your extra money does.

Same cash, both sides
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Line payoff
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Tide Method
Mortgage payoff
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same extra cash
Interest difference
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Side by side

Line
(Tide Method)		Mortgage,
same cash		Mortgage,
normal payments
Payoff time
Total interest
Line costs
closing, fees, new insurance		$0$0
Total cost
Cash you can still reach at month 12n/a
Average reachable cash during payoffn/a

The grey column is what most line-of-credit comparisons show: the mortgage making only its normal payment while the line gets all your spare cash. Comparing against that column is the misleading comparison, because it measures your extra money, not the line.

Balance over time

True cost and break-even

True yearly cost of the line
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Break-even line rate
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Get my line-vs-mortgage review

Your comparison above is yours to keep, no strings. If you want a second set of eyes, Eli checks live line-of-credit programs from multiple lenders against these numbers, including the lender's insurance requirements and the real closing costs, and tells you straight whether the line or the mortgage wins for you.

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How do you read these results?

The Tide Method is our name for an honest line-of-credit payoff plan: every deposit lands on the line and cuts the balance right away, bills go out as they come due, and whatever is left over is what pays the home off. The line is the tool. Your surplus does the work.

  • Line (Tide Method): your full income is deposited to the line each month and your living costs are drawn back out. Interest runs on the balance after deposits plus half the month's bills, an estimate of daily interest.
  • Mortgage, same cash: you make the normal payment and send the same leftover cash at the principal. With seasonal income, the cash needed for the slow months stays in checking instead of going to the house.
  • Mortgage, normal payments: the greyed reference column. It is there so you can see how big the gap looks when one side gets extra money and the other does not.
  • Cash you can still reach: the line's real advantage. Paid-down line balance can usually be drawn again during the draw period. Extra mortgage principal is locked in the house until you sell or refinance.
  • Break-even line rate: the line rate at which both plans cost the same. If you expect the line to stay under it, the line wins on cost.

Hypothetical example: a Big Pine Key owner with vacation rental income that lands mostly from December to April. On a mortgage, the high-season cash has to sit in checking to cover the slow summer. On a line, it cuts the balance the day it arrives and can be drawn back in August. That timing is why a line can win for seasonal income even at a slightly higher rate, and why it rarely wins for steady paychecks when the rate gap is wide.

Where should you go next?

HELOC options in FloridaStandard lines, first-lien lines, fixed home equity loans and investor lines, compared. Free-and-clear Keys homesHow a line works on a paid-off home, and how to keep the required insurance in check. The HELOC sweep, honestlyWhen the sweep strategy works in Florida, when it does not, and why. Refinance calculatorCompare a new first mortgage instead of a line. Debt consolidation calculatorPay off high-rate debt with home equity, side by side with a cash-out refinance. Coastal insurance estimatorRough out the premium a lender's coverage could cost before you apply.

HELOC Payoff Questions

Does a HELOC sweep really save interest?

Only when the math favors it. A sweep lets every deposit cut the balance the day it arrives, which trims interest a little. Most of the savings come from the surplus you send at the debt. Give a lower-rate mortgage that same surplus and it often costs less.

Why do other calculators show huge savings?

Many compare a line that receives all of your spare cash against a mortgage that only gets its normal payment. That measures your extra cash, not the line. This calculator gives both sides the same money, so the difference you see comes from the rates, the fees and the timing of your deposits.

When does a line of credit beat a mortgage?

When the rate gap is small, when your income arrives in lumps (seasonal rentals, business owners, commission earners), and when you value being able to pull paid-down cash back out. A large rate gap or a thin monthly surplus usually tips it back to the mortgage.

What happens if HELOC rates rise?

Most lines are variable and tied to prime, so the rate can change. Use the stress test to raise the line rate after month 12 and watch the payoff time and the break-even rate. If a small rise flips the result, the plan depends on rates staying put.

Do I need insurance on a HELOC on a paid-off home?

Expect it. Lenders require coverage on the home that secures the line, and the type and amount vary by lender and flood zone. You are not insuring the house for the bank, you are insuring the only thing that makes your equity usable. Our guide for free-and-clear Keys owners walks through the options.

Can I use this for a rental property?

Yes, as a planning model. Enter the rent you collect as income and the property's operating costs as expenses, and pick the seasonal pattern for a vacation rental. Investor and business-purpose lines have their own rules and approval standards, so treat the result as a starting point.

Is this a loan offer?

No. This is an educational tool that runs your own numbers. It is not a loan offer, a rate quote or a commitment to lend. Actual rates, fees, line amounts and insurance requirements depend on the lender, your credit, the property and its flood zone.

Educational planning tool only. Results come from a month-by-month simulation of your inputs. Line interest is estimated on the balance after each month's deposits plus half of that month's bills, which approximates daily interest; lenders calculate interest daily, so actual figures will differ. Seasonal income uses a fixed pattern starting in January. Most lines of credit carry variable rates that can rise, and line agreements can let a lender freeze or reduce a line in certain situations. Draw periods, fees, closing costs, Florida documentary stamp and intangible taxes, and insurance requirements vary by lender and property. This is not a loan offer, rate quote, pre-approval, or commitment to lend. © The Mortgage Dock · NMLS #1983384 · Coast2Coast Mortgage, LLC NMLS #376205 · Equal Housing Lender.