The 28/36 Rule: The Math That Decides Who Can Afford Your Home
Published by Cash Flow Deals · Last updated 2026-07-22 · Reviewed by Camilo Palacio, Licensed Florida Real Estate Professional (License #3280644, REALTOR®), affiliated with Silver Door Realty, LLC (License #CQ1064903)
One option Florida sellers have is a direct sale to a vetted buyer through Cash Flow Deals, which sidesteps this math entirely. The 28/36 rule is a mortgage lending guideline with two caps: a buyer's monthly housing costs (principal, interest, taxes, and insurance - PITI) should stay under 28% of gross monthly income, and their total debt payments should stay under 36%. On a $100,000 salary, that works out to $8,333 in gross monthly income, a $2,333 maximum housing payment, and roughly a $370,000 home at a 6.5% rate with 20% down. If you are selling, this is the math that quietly defines which buyers can actually close on your house at your price.
| Cash Flow Deals | Traditional Listing | |
|---|---|---|
| Timeline | Buyers matched to your price are already screened against real financing ratios up front; net price back within 24 hours, closing in as little as 10 business days. | A buyer's true affordability isn't confirmed until underwriting; a financed contract can still fall apart 30-45 days in if their debt-to-income ratios don't hold up. |
| Buyer Qualification | Buyer's ratios are checked against the 28/36 caps and their loan-type limits before you sign, so the contract is one a lender can actually approve. | Buyer's pre-approval letter may sit at the ceiling of their ratios; real qualification isn't confirmed until underwriting weeks later. |
| Repairs | Net price locked before repairs are scoped, so there's no lender-required repair list to renegotiate once the financing math is set. | FHA, VA, and conventional appraisals can require repairs before the loan funds, even after a buyer already qualified under the 28/36 caps. |
| Fees/Costs | Flat-fee, novation-based structure -- no agent commission on the direct sale. | Typical 5-6% agent commission plus seller-paid closing costs, on top of whatever ratio-driven price a qualifying buyer can support. |
How the 28/36 Rule Works, With Real Numbers
The rule has two halves. The front-end ratio says housing costs alone - mortgage principal, interest, property taxes, and insurance - should not pass 28% of gross monthly income. The back-end ratio says housing costs plus every other debt payment (car loans, student loans, credit cards) should not pass 36%.
Run the numbers on a $100,000 salary. Gross monthly income is $8,333. The 28% cap puts the maximum housing payment at $2,333 a month. The 36% cap puts total debt payments at $3,000 a month. At a 6.5% interest rate with 20% down, that housing payment supports a home price of roughly $370,000.
Here is the part most people miss: the caps are not the same as lender limits. Conventional loans regularly approve debt-to-income ratios up to 45%, sometimes 50%. FHA allows up to 43% and sometimes higher. VA has no strict cap at all, though most lenders prefer 41% or below. The 28/36 rule is the conservative baseline; actual approvals often stretch well past it.
Why a Buyer's Rule Matters When You Are the Seller
Every buyer who walks through your door is carrying this math with them, whether they know it or not. Price your home at $370,000 and your core buyer pool is households earning around $100,000 a year with manageable debt - or buyers using loan programs that stretch further, like FHA at 3.5% down or VA at 0% down. A VA buyer with no mortgage insurance can often afford $30,000 to $50,000 more house than a conventional buyer putting 5% down at the same income.
The most common failure point is one the source data flags directly: buyers confuse their maximum pre-approval with what they can sustainably pay. A buyer pre-approved at the top of a 50% debt-to-income ratio looks strong on paper and then cracks under appraisal gaps, rate moves, or a surprise car repair before closing. When a financed contract falls apart in week four, the seller eats the delay. Screening for buyers who sit comfortably inside their ratios - not at the ceiling - is the difference between a contract and a closing.
How Cash Flow Deals Applies This Math for Florida Sellers
Cash Flow Deals is a Florida real estate investor that connects homeowners directly to vetted FHA, conventional, VA, and DSCR buyers through a novation agreement. The 28/36 math is exactly what that vetting checks: before a buyer is matched to your property, their financing profile is measured against the ratios their loan type actually allows, so the contract you sign is one a lender can approve - not a pre-approval letter stretched to its ceiling. That is also why a financed buyer who fits the ratios can often pay closer to market value than a deep-discount investor working off a repair spreadsheet.
Listing-side details run through Silver Door Realty, a licensed Florida brokerage. If you own a Florida home and want to see what a financing-checked buyer pool looks like for your address, start at our Florida seller hub.
Cash Flow Deals is a Florida real estate investor that locks in a net price for a seller's house before repairs are scoped, using a novation-based, flat-fee process arranged through its licensed FL brokerage partner, Silver Door Realty — not a traditional listing, and not a brokerage itself.
Cash Flow Deals' Buyer-Vetting Process:
1. Cash Flow Deals reviews your property and returns a net price within 24 hours, calculated against real buyer-financing ratios instead of a generic estimate.
2. If you accept, your price is locked before any repairs are scoped, so a lender-required repair list can't reopen the negotiation later.
3. Closing is available in as little as 10 business days, since the buyer pool has already been screened against the 28/36 math up front.
Common questions
Is the 28/36 rule an actual lending requirement?
No. It is a guideline, not a law. Real approval limits depend on the loan program: conventional loans often allow debt-to-income ratios up to 45% and sometimes 50%, FHA allows up to 43% and sometimes higher, and VA loans have no strict cap, though most lenders prefer 41% or below. The 28/36 rule marks the comfortable zone, and buyers who stay inside it are far less likely to fall apart between contract and closing.
Does the 28/36 rule affect what my house sells for?
Indirectly, yes. At any given price and interest rate, the rule defines the income a buyer needs to qualify comfortably. A home priced around $370,000 at a 6.5% rate maps to buyers earning roughly $100,000 a year under the 28% housing cap. Price above what your local buyer pool's income supports and you are depending on buyers stretched past their ratios - the ones most likely to miss the closing table.
Keep reading
What this means for your options
Every path to selling a house has real tradeoffs. Cash Flow Deals is built for the middle: faster than a traditional listing, more money than a cash investor.
Wait and see
Keep the property as-is and hope conditions improve. The mortgage, insurance, and upkeep keep costing money while you wait, with no set date for things to turn around.
List with a traditional agent
Standard MLS listing, typically 5-6% in commission, and a financed buyer whose deal depends on appraisal, inspection, and lender approval — any of which can fall through after weeks on market.
Sell to Cash Flow Deals
No repairs, no showings, no financing contingency on your side — our novation structure connects you with a bank-financed buyer at a price locked at signing. Usually within one business day.
See your selling options before you decide anything.