You have probably seen the video: move your mortgage into a home equity line of credit, run your paycheck through it, and a 30-year loan disappears in five to seven years. I broker home equity lines from several bank and non-bank lenders, so I have no reason to talk you out of one. But the honest version is less magical and more useful than the pitch.

Here is what is real, what is hype, and which Florida owners a line of credit actually helps.

What is the HELOC sweep strategy?

The idea goes by a few names: the HELOC sweep, velocity banking, the all-in-one loan, or "Australian offset style." They all describe the same move. Instead of a regular mortgage with a fixed payment, you carry your home debt on a line of credit and treat that line like a checking account.

• Money in: every paycheck, rent deposit, or business payment goes straight onto the line, which cuts the balance the day it lands.
• Money out: you pay your bills from the line as they come due.
• What is left: whatever you earn and do not spend stays on the line as a lower balance, so you pay less interest next month.

Some versions use a first-lien HELOC, where the line replaces your mortgage or sits on a home you own free and clear. An all-in-one loan is a first-lien line with a deposit account built in, so the sweep happens automatically. The "Australian" label comes from offset accounts common there, where savings held next to the mortgage reduce the interest charged.

None of that is a scam. The problem is the math in the sales pitch.

What math do the viral videos skip?

Most sweep pitches compare a 30-year mortgage making only its required payment against a line of credit getting every spare dollar, often $15,000 a month. Of course the line wins. It got all the extra money and the mortgage got none.

Give both sides the same cash and the picture flips. Here is a worked example on a $500,000 balance. These are hypothetical rates for illustration, not a quote.

Hypothetical rates for illustration, not a quote or an offer. Interest figured monthly on the balance, before taxes, fees, and insurance. Your own numbers will differ.

The pitch compares row one to row three and calls it almost half a million dollars saved. The fair comparison is row two against row three. With the same $15,000 a month, both are gone in about 37 months, and the cheaper rate costs about $9,000 less. The $15,000 a month paid the house off, not the line.

Does parking your paycheck on the line save much?

A little. Say a $12,000 monthly deposit sits on the same hypothetical 6.5% line for an average of 15 days before bills pull it back out. That saves about $32 a month, roughly $385 a year. Real money, but nowhere near enough to cover a one-point rate gap on a large balance. The "float" is a nice bonus, not the engine.

When does a line of credit genuinely win?

Strip out the hype and a line has one real advantage: money you pay in can come back out. An extra payment on a mortgage is gone for good. You cannot call the servicer in September and ask for it back. That matters a lot for some Florida owners.

• Seasonal or lumpy income. A vacation rental in Key West, Marathon, or Islamorada can earn most of its year between December and April. Season income knocks the balance down, and the slow months still have access.
• Business owners and commission earners. When income arrives in big, uneven chunks, a line matches how the money actually shows up.
• Cash you can reach. The same dollars can be your cushion and your paydown. In the Keys, where a roof, a seawall, or a storm deductible can come due fast, that is worth something.
• A small rate gap. If the line costs about the same as your best fixed option, the flexibility comes cheap.
• Disciplined spenders. People who already track their money and live well below their income are the ones who see the balance fall.

Free-and-clear owners are a special case. If your Keys home is paid off, a first-lien line can be a way to have equity on standby without taking a lump-sum loan you do not need yet. The catch for most of those owners is insurance, which I cover in the free-and-clear Florida Keys guide.

When does the sweep strategy lose?

• A wide rate gap. If you trade a low fixed mortgage rate for a higher variable line, you start the race behind. The worked example shows a one-point gap costing about $9,000 over three years, and many owners locked rates far below today's lines.
• A thin surplus. If you spend most of what you earn, there is nothing to sweep. The balance barely moves, and you are paying a variable rate on a large debt.
• Rising rates. Most lines are variable and tied to the prime rate. If prime climbs, so does the cost of every dollar you owe, and the payoff date slides.
• Spending discipline. A line that works like a checking account also spends like one. A boat or a few loose months can refill it quietly.
• Freeze risk. Under the federal Truth in Lending rule for home equity plans, a lender can freeze or reduce a line when the home's value drops significantly below its appraised value. After a damaging storm, unused credit may not be there exactly when you want it.

That last point is why a line should never be your only emergency fund in the Keys. Keep some cash outside it.

What is the Tide Method?

In plain words: it is a line-of-credit payoff plan where all your income lands on the line and cuts the balance right away, your bills go out only when they are due, and the surplus left over is what pays the home off. We call it the Tide Method because income comes in like the tide and bills go out on schedule. The line is the tool. Your cash flow does the work. Here is how we run it.

1. Measure your real surplus first. Use three to six months of actual deposits and spending. No steady surplus, no plan. A line does not fix a budget.
2. Compare with equal cash. Run the same monthly money through your mortgage and through a line, using real quotes from more than one lender.
3. Size the line to the job. A bigger line is not a better line. In Florida, a smaller line means lower state taxes at closing and, generally, a smaller required flood policy.
4. Let the tide come in. Route paychecks, rent, and business deposits to the line so the balance drops the day money arrives.
5. Let bills go out on schedule. Pay them when they are due, not early, so your money spends more days lowering the balance.
6. Set a storm floor. Before hurricane season, pick an amount of cash and credit you will not touch, and keep part of it outside the line.
7. Stress-test the rate. Rerun the plan with a higher rate. If a two-point rise breaks it, it is not a plan yet.
8. Check the balance every quarter. If it is not falling, switch to a fixed payoff schedule or move the balance to a fixed-rate loan.

What does a line of credit cost to open in Florida?

Florida adds a cost most national videos never mention. Florida charges documentary stamp tax of $0.35 per $100 and intangible tax of 0.2% on the amount a recorded mortgage secures. For a line of credit, both are figured on the full line amount, not just what you draw. Example: a $200,000 line is about $700 in doc stamps plus $400 in intangible tax. Lenders may cover or pass these on. Sources: the Florida Department of Revenue pages on documentary stamp tax and nonrecurring intangible tax.

Add any lender fees, an appraisal or valuation, and title and recording. A pitch that skips these is leaving out part of the bill, and it is one more reason to size the line to what you need.

What insurance does a HELOC need in Florida?

Every lender wants the home insured. Here is how it generally works:

• Hazard and wind. Coverage on a HELOC is a lender requirement, not a federal law, and minimums differ by lender: some size it to the loan, others to replacement cost. Deductible caps differ too. I compare lender requirements before you apply.
• Flood. Federal law requires flood insurance on loans from federally regulated lenders only when the building is in a FEMA Special Flood Hazard Area, zones beginning with A or V. Outside those zones, flood coverage is up to the lender. Most institutional lenders follow the same rule whether or not they are federally regulated.
• How much flood. Required flood coverage is generally the lesser of the loan amount, the NFIP maximum, or the building's insurable value. For a line of credit, lenders generally size it to the full line amount, so a smaller line can mean a smaller required policy. Lender rules vary.
• Citizens policyholders. Citizens Property Insurance is phasing in a requirement that its wind and homeowners policyholders also carry flood insurance, with the phase-in expanding through 2027.

Start with the zone. The flood zone checker gives a preliminary read on any Florida address, and the coastal insurance estimator gives you a ballpark before you call an agent. In the Keys, also know the FEMA 50% rule: if repairs reach half the structure's market value, the home generally must be brought up to current floodplain rules, which often means elevating or rebuilding.

If you own your Keys home outright and skipped insurance on purpose, read the free-and-clear guide before you rule a line out. Your insurance agent prices the policy. I size what the lender requires, and shop lenders whose requirements fit.

First-lien HELOC or second-lien HELOC?

This choice decides whether a sweep makes sense at all.

• First-lien HELOC. The line is the only loan on the home. It either pays off your mortgage or sits on a home you own free and clear. This is the true sweep product. If you have a low fixed mortgage rate today, replacing it is usually the expensive part of the plan.
• Second-lien HELOC. A standard line behind your existing mortgage, usually variable and tied to prime. You keep your first-mortgage rate and use the line for a specific job, like a repair or higher-rate debt. You can still run the Tide Method on the line itself.
• Fixed-rate home equity loan. A lump sum behind your first mortgage, for when you know the amount and want certainty.
• Investor line of credit. A business-purpose line on a rental, where the rent carries the costs, underwritten closer to a DSCR loan.

A cash-out refinance is the other path. It replaces your whole mortgage, so compare it in the refinance calculator before you decide. The full product menu is on the Florida HELOC hub.

What are the red flags in a sweep pitch?

• A guaranteed payoff date. Nobody can promise your income, spending, and rate for the next seven years.
• Unequal cash. If the line gets your surplus and the mortgage gets nothing extra, the comparison is rigged.
• No talk of rising rates. A variable line priced off prime needs a plan for a higher rate.
• Hidden costs. Lender fees, annual fees, appraisal, title, and, in Florida, doc stamps and intangible tax on the full line.
• Pressure to move all your savings. Pushing your emergency fund or retirement money into the line leaves you exposed if the line is frozen.
• A paid "system." Software or coaching sold alongside the loan. The method runs fine on a spreadsheet.

If a pitch hits two of these, slow down and run the fair math yourself.

Examples on this page use hypothetical rates for illustration and are not a quote, an offer, or a commitment to lend. Loan terms, eligibility, and availability change without notice. All loans are subject to credit approval, property eligibility, and lender guidelines. Not tax, legal, or insurance advice.

HELOC sweep strategy FAQ

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