First-time buyer in Knoxville? Start with these four numbers.

Most of the first-time buyers I work with come in with a Zillow tab open and the same nervous question: "Can we actually afford this?" The honest answer almost always lives in four numbers — and you can do the math at your kitchen table before you tour a single house.

This is not a mortgage tutorial. There are plenty of those, written by people who do that work for a living. What I want to give you is the four numbers I walk through with first-time clients before we ever pull a listing — the four that tell you, with reasonable confidence, what you can buy in Knoxville this year and what would stretch you in ways you don't want to be stretched.

The numbers are: 28%, 5%, $2,800, and 3 months. Here's what each one means.

Number one: 28%

The first number is your housing-to-income ceiling. Lenders call this the front-end debt-to-income ratio, and the rule of thumb most reasonable lenders are still using in 2026 is that your total monthly housing payment — principal, interest, taxes, insurance, and HOA, all added together — shouldn't be more than about 28% of your gross monthly income.

The math is straightforward. Take your annual household income, divide by twelve, multiply by 0.28. That's your monthly housing ceiling.

A $90,000 household income gives you about $2,100 a month. A $120,000 household gets to about $2,800. A $150,000 household reaches roughly $3,500. Some lenders will let you push to 31% or even 36% on the front end — but the houses you stretch into at 31% are almost always the ones you regret six months in, when the HVAC unexpectedly needs replacing and there's nothing left in the cushion.

The 28% number isn't just about what a lender will approve. It's about what leaves you enough room to live a normal Knoxville life — Saturday at Founders Park, dinner out at the spot you've been meaning to try, a fall weekend at the cabin without anxiously checking the bank app.

Number two: 5%

The second number is the down payment most Knoxville first-time buyers actually use — not the storied 20% you've heard about your whole life.

The 20% rule comes from a different era. In Knoxville's actual 2026 first-time buyer market, the down payments I see closing range from 3% to 10%, with 5% being roughly the median. There are several conventional, FHA, USDA, and Tennessee Housing Development Agency loan programs that work fine at 3-5% down, particularly for buyers under the median household income for the metro.

On a $400,000 first home — which is a reasonable starter price band in Knoxville this spring, depending on where you're shopping — that's the difference between needing $20,000 saved (5%) versus $80,000 (20%). For most first-time buyers, the smaller number is what makes home ownership actually possible this year instead of in 2030.

The trade-off is real but manageable: lower down payments usually mean private mortgage insurance (PMI), which adds maybe $80 to $200 to your monthly payment until you reach 20% equity. That's not nothing, but it's also not a reason to wait five more years. Most of my first-time clients are happy to start building equity now and refinance the PMI off later.

Number three: $2,800 (or thereabouts)

The third number is what a typical Knoxville first-time monthly payment actually looks like in spring 2026 dollars. Roughly $2,800 a month, all-in.

That number is built on a $400,000 home, 5% down, a 30-year fixed mortgage at the rates we've been seeing this spring (high sixes to low sevens, depending on lender and credit profile), Knox County property tax, a standard homeowners insurance policy, and PMI. Different ZIP codes shift the property-tax piece — the city-of-Knoxville parcels tend to run a bit higher than unincorporated Knox County, and Farragut town parcels add a small additional levy. None of those swings is huge.

The reason this number matters is that it gives you a translation between what's in your bank account today and what your first house will feel like. If $2,800 a month is a stretch on your current paycheck, then a $400,000 home is probably a stretch this year — and you should either look in a slightly different price band, save for a few more months, or plan around a different ZIP. If $2,800 is comfortable, the four-hundreds are probably your zone.

For specific ZIPs and price bands, the Knox-area mortgage calculator on this site is calibrated to Knox County tax rates and runs the math in about thirty seconds. It's a more useful first stop than any national calculator I've seen.

Number four: three months

The fourth number is the one nobody likes to talk about. After your down payment is paid, after closing costs are settled, after the moving truck and the first electric bill — how much cash do you still have in the bank?

The answer should be at least three months of your full housing payment, plus your normal monthly expenses, sitting somewhere accessible. Six is better. One is too few.

This isn't a lender requirement — most loan programs only require one or two months of reserves to qualify. It's a livability requirement. The first six months in a new home almost always include at least one expensive surprise: a water heater that picks an inconvenient week to fail, a roof leak nobody saw, a tree that comes down across the driveway in a summer storm. None of those are catastrophic on their own. All of them are catastrophic in combination, if there's nothing in the cushion.

Most of my first-time clients who plan around this number — and not just the lender minimum — describe their first year of ownership as "stressful but fine." The ones who buy at the absolute edge of what they qualify for tend to describe it differently.

What the four numbers don't tell you

The four numbers are the math. They're a useful gate, and they keep most first-time buyers from making the kind of mistake that follows them around for ten years. But they don't tell you which Knoxville neighborhood is right for you, which streets have the school zones you want, or which subdivisions are quietly worth more than the listing price suggests.

That's the part where having a local agent stops being optional. Once your numbers are in range, the question shifts from "what can I afford" to "where in Knoxville does my number actually buy something I want to live in for a decade." That's a different conversation, and it's one I have happily — even with buyers who are eight or twelve months out from being ready.

If you're shopping the move-in-ready end of the market specifically, my move-in-ready Knoxville guide is a good companion to this post. And if you're moving in from out of state, the Farragut relocation post walks through the part of the picture Zillow can't show you.

The half-hour kitchen-table check

If you do nothing else with this post, do the half-hour version. Sit down at the kitchen table on a Saturday morning, and answer the five questions below honestly. That's almost always enough to know whether the next step is touring houses, talking to a lender, or saving for six more months.

Whatever the answers are, they're the answers. The math is the math; the only mistake is pretending the math says something different than it does. Buyers who work the four numbers honestly, even when the answer is "not yet," almost always end up in a house they're happy in. The ones who don't, sometimes don't.