The co-signer model asks a relative to back a stranger's lease, and asks you to trust a balance sheet nobody looks at again after signing day. Here is what changes when the backing is underwritten instead of borrowed.
Because the approval standard fails most of the city, and a co-signer was the only patch anyone had. The three-times-rent rule asks $95,760 a year against a median renter household earning $56,328 — so owners reached for a relative's signature to close the gap.
It was a reasonable patch in a different market. It assumed the applicant had a relative here, with strong US credit, enough income to carry two rents on paper and the willingness to sign for somebody else. In a county where 54.5% of residents were born abroad, that assumption quietly excludes most of the people applying — and the ones it excludes are not the risky ones, they are the new ones.
The second problem is that the patch is never re-examined. A co-signer's finances are photographed once, on signing day, and never looked at again for the length of the lease or the renewals after it. The person who qualified in May may have retired, refinanced or taken on a mortgage by November. You are relying on a number nobody is watching.
Enforcement is where the arrangement shows what it is. Collecting from a co-signer is a separate legal action against a private person, with its own filing, its own hearing and its own calendar, running on top of the possession case you already have on the unit. In Miami-Dade that possession case alone starts at $185 to file, $10 per summons and $115 for the sheriff, before anyone counts a lawyer's hours.
And the clock does not care which case you are in. An uncontested Florida eviction runs four to five weeks; a contested one runs two to three months, while the unit stays empty at roughly $92 a day and the condo fee keeps arriving. The relative you were counting on may also live in Bogotá or São Paulo, where enforcing anything means foreign courts and years. That is not backing. That is a document that resembles backing.
None of this makes the co-signer dishonest. It makes the arrangement fragile: built on one person's good year, checked once, and collectable only through a court you will probably never use.
Sources: RentCafe (Miami rental competition and occupancy, 2025); U.S. Census Bureau, ACS 2020-24 (Miami-Dade demographics and rents); CFPB (credit invisibility).
| What actually matters | Traditional co-signer | Grenty |
|---|---|---|
| What actually backs the payment | One person's word and a snapshot of their finances, never re-verified after the lease is signed. | An underwritten commitment from a company whose business is paying when a tenant does not. |
| Speed to approval | Chasing documents across two households, often in another state or country. Weeks, and sometimes a lost unit. | One file, one decision, in minutes rather than weeks. The unit does not sit empty while paperwork travels. |
| When you actually have to collect | You pursue an individual: demand letters, court, legal fees, and a family relationship that turns hostile fast. | You file a claim under a written agreement, with a counterparty that exists to receive claims and process them. |
| Who can actually qualify | Only applicants with a US relative holding strong credit, high income and the willingness to sign for someone else. | Self-employed, 1099 earners, retirees with assets and applicants with no US credit file, all evaluated on real income. |
A co-signer gives you somebody to sue. That is not the same as being paid.
Ask who re-checks. A co-signer is verified once and never again. Ask any arrangement how often the party behind the rent is re-examined during the lease.
Count the second case. Collecting from a relative is an action separate from the possession case, with its own filing, hearing and months. Two files, one empty unit.
Check the address. A signature from abroad is a signature you enforce abroad. Foreign courts and years are not a plan for a Miami unit sitting empty.
Nothing up front, which is exactly why it looks free. The cost arrives later and is paid in months: two legal tracks instead of one, an empty unit at about $92 a day, and a turn that historically runs 33 days once you finally have the keys back.
Run the arithmetic once and the comparison stops being philosophical. The average eviction costs $3,500, of which $2,540 is rent nobody gets back, and the turnover afterwards adds $1,750 to $4,000. Add the vacant days. Then add the second action against the co-signer, which only starts once the first one ends. Against all of that, a single payment made before anyone moves in is a rounding error.
Not between a free option and a paid one. Between a cost whose size you know on signing day and a cost whose size you find out in a courtroom eighteen months later. One of them is a line in a lease; the other is a range that depends on whether the tenant hires a lawyer, whether the relative answers the phone, and which country the answer comes from.
This is also the honest place to name the limits. Rent Protection never buys an approval and never replaces your screening — you still choose the tenant, and Grenty states only what it will stand behind, on terms written into the agreement before the lease is signed. From $399, one payment covering the entire lease term, for rents up to $2,000 a month; above that it varies with the rent, and who pays is agreed deal by deal.
Ask yourself one question: if the rent stops, will you actually sue the co-signer? Most owners will not, because it means court, cost and months. Rent Protection is designed to be claimed, not threatened.
Then you have a signature, not a remedy. Enforcing against a co-signer in Bogotá or São Paulo means foreign courts and years. In a market where 19 people apply for the same unit, that is not protection — it is paperwork that only looks like it.
You can, but it rarely adds much. Once the rent obligation is backed by an underwritten party, a relative's signature is a second promise sitting on top of an obligation that is already covered.
Usually, yes. It adds a second person to screen, a second set of documents to chase and a second schedule to work around, and in Miami that is time you do not have: nineteen renters apply for every vacant unit. The applicant waiting on a relative's statements is rarely the one who signs first.
Say what you need instead of what you refuse. Something like: I need the rent on this lease backed by a party I can actually reach, not a signature in another country. Then point at the route that does it. People take that far better than a flat no, because it leaves them a way in.
In practice you widen the pool instead of shrinking it. People bring a co-signer because the three-times-rent rule leaves them short — a rule that asks $95,760 a year in a city where the median renter household makes $56,328. Give them another way to qualify and most of them never needed the relative.
One conversation, no commitment and no paperwork. Tell us where your rental stands today and we will show you exactly what changes on your side of the table.
Protect my rent →