What Can I Afford? The House Budget Math That Actually Decides It

Start With the 28/36 Rule, Then Sanity-Check With Income Multiples

Two numbers do most of the work. The 28% rule says your total monthly housing cost (principal, interest, taxes, insurance) should not pass 28% of gross monthly income. The 36% rule says all monthly debt payments combined - housing plus car loans, student loans, credit cards - should stay under 36%. That second number is your debt-to-income ratio: monthly debt payments divided by gross monthly income, times 100. Lenders lean on DTI standards tracked by the Consumer Financial Protection Bureau, so these are not folk wisdom; they are the lines underwriters actually draw. The fast cross-check is the income multiplier: a home priced at roughly 3x to 5x gross annual income. At $50,000 a year that is about $150,000 to $225,000. At $100,000 a year, about $300,000 to $450,000 with monthly housing capped near $2,333. If the multiplier answer and the 28% answer disagree, trust the monthly-payment math - it is the one the lender uses.

The $55,000 Swing Most Buyers Miss: Rates and the Costs Beyond the Mortgage

Here is the number that surprises people. The same $1,500 monthly payment on a 30-year loan buys about a $293,000 home at a 5.5% rate, about $264,000 at 6.5%, and only about $238,000 at 7.5%. Your budget did not change; your buying power dropped $55,000 anyway. Then come the costs that never show up in a mortgage calculator: property taxes averaging about 1.1% of home value per year (0.3% to 2.2% depending on state), homeowners insurance at $1,200 to $3,000+ annually, PMI of 0.5% to 1.5% of the loan when you put down less than 20%, and a maintenance reserve of 1% to 2% of home value every year. Closing costs add another 2% to 5% of the purchase price. The single most common mistake in the affordability guides is stretching to the maximum approval amount - the lender approves you to the 36% line and leaves zero room for any of the above. And per the National Association of Realtors, the typical first-time buyer puts down just 8%, not 20%, so budgeting for PMI is normal, not a failure.

What Buyer Affordability Means When You Are the Florida Seller

Affordability math is not just a buyer problem. When you sell, your closing depends on whether your buyer's DTI, rate lock, and reserves survive underwriting - and sales that collapse three weeks into escrow usually trace back to a buyer who stretched past that 36% line. This is where Cash Flow Deals fits. 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, which means the buyer's financing strength is checked before anyone signs, not discovered mid-escrow. Listing-side details run through Silver Door Realty, a licensed Florida brokerage. If you are weighing a sale and want a buyer whose affordability math has already been run, start with the selling options for Florida homeowners page and see what a vetted-buyer path looks like for your property.

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' Offer Process:

1. Contact Cash Flow Deals with your Florida property's address -- there's no buyer DTI, rate lock, or reserve requirement to clear, because there's no bank underwriting your sale.

2. Get a net-price offer back within 24 hours, locked before any financing contingency can collapse your closing the way a buyer's stretched 36% debt-to-income ratio can.

3. Close on your schedule, in as little as 10 business days, without waiting on a buyer's mortgage approval to survive underwriting.