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The Formula for Buying a Home the Right Way (Most People Skip This Step Entirely)
By Dan Keller | Mortgage Advisor | New American Funding | Everett, WA
Most lenders start with a pre-approval.
Pull your credit, look at your income, and tell you the maximum loan amount you qualify for. That number goes at the top of the page and the conversation flows from there.
The problem with that approach is that maximum and comfortable are two very different numbers. And buying at the top of what you qualify for without first understanding what you can actually live with is one of the most common financial mistakes buyers make.
Here is a different starting point. Save this post, write this down, or bookmark it and come back to it. This is the formula used with every single client before anything else happens.
Start Here: Reverse-Engineer Your Budget
Instead of starting with what a lender will approve, start with what fits your life.
The goal is to find a home price that lets you own real estate, build equity, and still have room to save and invest every month. That is what a sustainable mortgage looks like. Not just one you can technically afford, but one that does not squeeze everything else out of your financial picture.
Here is the sequence, step by step.
Step 1: Find Your Max Comfortable Monthly Payment
Take your gross annual household income and divide by 12. That gives you your gross monthly income.
Then multiply that number by 0.36.
That result is your maximum comfortable total monthly housing payment. This is the number that keeps you in a healthy range, covering the mortgage while still allowing you to save, invest, and live without financial stress.
Example:
Gross household income: $180,000 per year
Divided by 12 = $15,000 per month
$15,000 x 0.36 = $5,400 per month
That $5,400 is your ceiling for total monthly housing costs, meaning principal, interest, property taxes, homeowners insurance, and any mortgage insurance or HOA dues.
If your number comes out lower than you hoped, that is useful information too. It means there is work to do before you buy, whether that is paying down debt, increasing income, or building savings. Knowing the real number now is far better than finding it out after you are under contract.
Step 2: Find Your Comfortable Price Zone
Now take your maximum comfortable monthly payment and divide by 7.6.
That gives you your approximate comfortable purchase price.
Continuing the example:
$5,400 divided by 7.6 = approximately $710,000
For a household earning $15,000 per month gross, that puts a home around $710,000 in a comfortable range. For a household earning $10,000 per month gross, the same math lands around $473,000.
This is not the same as the maximum loan amount a lender will approve. This is the price point where the monthly payment fits naturally into your financial life without crowding out everything else.
Step 3: Calculate Your Cash to Close
Once you have a price zone, the next step is understanding how much cash you need to get there.
Take your comfortable purchase price and multiply by 6.5%.
That 6.5% breaks down as:
3% for closing costs
3.5% for your down payment (this assumes an FHA loan)
Continuing the example:
Purchase price: $710,000
$710,000 x 6.5% = $46,150
That is the total cash you need to close on a $710,000 home using an FHA loan with 3.5% down. Broken out, that is roughly $24,850 for the down payment and $21,300 for closing costs.
One important note on closing costs: as discussed in the negotiating power post, sellers in the current Snohomish County and greater Seattle market are frequently contributing toward buyer closing costs. If you negotiate a $10,000 to $15,000 seller credit, your actual out-of-pocket drops significantly. That is not guaranteed, but it is happening regularly enough in 2026 to be worth factoring into your plan.
For a detailed breakdown of what monthly payments look like at common Snohomish County price points, see the full payment breakdown post here.
Step 4: Build Your Savings Plan
Here is where most homebuyer advice stops. This is where it gets more interesting.
A strong savings habit is the foundation of everything that comes next, and there is a specific target worth working toward.
Take your gross monthly household income and multiply by 30%. That is how much you should be saving every month, not just for the down payment but as a general wealth-building habit.
Example:
Gross monthly income: $15,000
$15,000 x 30% = $4,500 per month
Now take your cash-to-close number from Step 3 and divide it by your monthly savings target. That tells you exactly how many months it will take to save up what you need.
Example:
Cash to close: $46,150
Monthly savings: $4,500
$46,150 divided by $4,500 = approximately 10 months
If you are starting from zero and buying at that price point, you are about 10 months away with disciplined saving. That is a real, actionable timeline. Not "someday," not "when I have enough," but a specific number of months tied to a specific savings target.
If you already have some savings, subtract what you have and divide the remainder by $4,500. That is your adjusted timeline.
Putting the Full Formula Together
Here is the complete sequence in one place:
Step 1: Gross monthly income x 0.36 = Max comfortable monthly payment Step 2: Max comfortable monthly payment divided by 7.6 = Comfortable purchase price Step 3: Comfortable purchase price x 6.5% = Cash to close (FHA, 3.5% down) Step 4: Gross monthly income x 30% = Monthly savings target Step 5: Cash to close divided by monthly savings target = Months to save
Run those five numbers and you have a complete picture of where you stand today and exactly what it takes to get to the closing table.
A Real Example for Snohomish County Buyers
The median household income in Snohomish County is approximately $100,000 per year according to recent census data. Here is what the formula looks like at that income level, with a purchase target in the $550,000 to $600,000 range that is realistic for much of the county in 2026.
$100,000 annual income ($8,333/month gross):
Step 1: $8,333 x 0.36 = $3,000/month max comfortable payment
Step 2: $3,000 divided by 7.6 = $394,700 comfortable price zone
Step 3: $394,700 x 6.5% = $25,656 cash to close
Step 4: $8,333 x 30% = $2,500/month savings target
Step 5: $25,656 divided by $2,500 = approximately 10 months to save
For a dual-income household in Snohomish County earning $50,000 each, the formula gives a comfortable price zone around $395,000 on a single income. When both incomes are combined and qualifying together, that comfortable range shifts significantly higher, which is why most buyers in this market purchase with a co-borrower. Running the combined income through the formula together is always the more useful starting point. And for most buyers, a savings timeline of 10 months or less from zero gets them to the closing table, with existing savings shortening that runway considerably.
Cities like Lynnwood, Mountlake Terrace, Kenmore, and Bothell fall in similar price ranges with similar timelines. Mill Creek and Edmonds trend slightly higher, which adjusts the savings target accordingly. Running your specific numbers for your specific target city gives you a far more useful roadmap than a general estimate ever could.
Why This Approach Is Different
Most mortgage conversations start with qualification. What do you earn, what is your credit score, what is the maximum we can lend you.
That is the wrong starting point for a first conversation. Maximum qualification and comfortable monthly payment are almost never the same number, and optimizing for the former at the expense of the latter is a pattern that puts buyers in homes they can technically afford but financially struggle with.
The reverse-engineer approach flips that. Start with the life you want to live. Back into the home price that supports it. Then build a plan to get there.
That is the formula. Those are the steps. And that is the conversation worth having before anything else.
Frequently Asked Questions
Q: How much house can I afford in Snohomish County in 2026?
The answer depends on your gross household income, your existing monthly debt, your credit score, and the loan program you use. As a starting point, take your gross monthly income and multiply by 0.536. That is your maximum comfortable total monthly housing payment. Divide that number by 7.6 to get your comfortable purchase price. At a $100,000 household income, that math lands around $587,000, which is well within reach across much of Snohomish County.
Q: Is 3.5% down really enough to buy a home in the greater Seattle area?
Yes, for FHA loans. The 2026 FHA loan limit for Snohomish County is $1,063,750 for a single-family home, which means FHA financing is available well up the price ladder in this market. At 3.5% down on a $600,000 home, your down payment is $21,000. Closing costs bring the total cash needed to close to approximately $39,000, which may be partially offset by seller concessions in the current market.
Q: What if I cannot save 30% of my income right now?
Start with whatever you can save consistently and build toward it. The 30% figure is a target, not a pass/fail threshold. Even saving 15% to 20% of your income consistently is meaningful progress. The key is knowing your actual timeline based on your actual savings rate, so you have a real plan instead of a vague intention.
Q: Should I get pre-approved before running this formula?
Run the formula first. Understanding your comfortable price zone before you talk to a lender keeps the conversation grounded in what fits your life rather than what the maximum approval allows. Once you have that number, getting fully pre-underwritten gives you the credibility to act when the right home comes along.
Q: What is the difference between pre-approval and pre-underwriting?
A pre-approval is a surface-level review of your income, credit, and assets. A pre-underwrite means an actual underwriter has reviewed your complete file and issued a conditional approval before you write an offer. In a competitive market, a pre-underwritten buyer is taken far more seriously by sellers and listing agents than one carrying a standard pre-approval letter. This is the starting point for every client before they write a single offer.
Q: Does this formula work for conventional loans too?
Yes, with a small adjustment to Step 3. Conventional loans with 5% down would use 8% instead of 6.5% in the cash-to-close calculation (5% down plus approximately 3% in closing costs). At 20% down, which eliminates PMI, the calculation would use 23%. The income and monthly payment steps stay the same regardless of loan program.
Learn the Full Playbook in Person
This formula is the starting point. There is a complete playbook that goes with it, covering credit optimization, loan program selection, offer strategy, and the full path from where you are today to the closing table.
That playbook gets taught every month at the free First-Time Homebuyer Class in downtown Everett. It runs about 90 minutes, it is in person, and every attendee leaves with a specific plan for their situation, not generic advice.
Register for the next class at happyhomebuyerclass.com. It is free. It is worth the drive from anywhere in Snohomish or King County.
Or reach out directly to run your specific numbers together.
Call or text (425) 350-7136. Email dan.keller@nafinc.com. Or book a time at calendly.com/meetdankeller.
Let's connect. Cheers!
— DK
Dan Keller | NMLS #115349 | New American Funding | 2733 Colby Ave, Everett, WA 98201
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