A $400,000 house in Sioux Falls costs roughly $2,900 to $3,500 a month at today’s 7.32% mortgage rate, depending on how much you put down. The biggest swing is your down payment — and whether you’re paying private mortgage insurance.
Quick Answer: At a 7.32% 30-year fixed rate (Freddie Mac, October 2026), a $400,000 Sioux Falls home runs about $2,880 a month with 20% down and no PMI, and closer to $3,500 a month with 5% down once private mortgage insurance is added. Those figures fold in principal, interest, property taxes, and homeowners insurance — not just the loan itself.
By Tyce Ortman · October 24, 2026
What’s actually in that monthly payment?
When buyers ask me what a house “costs” per month, they’re usually thinking about principal and interest. That’s only part of it. Your real monthly payment — the number that hits your bank account — is made up of four pieces, and sometimes a fifth:
- Principal and interest (P&I) — the loan itself, set by your rate, term, and loan amount.
- Property taxes — paid in arrears in South Dakota and usually collected monthly into an escrow account.
- Homeowners insurance — also escrowed; higher here than the national average because of hail.
- Private mortgage insurance (PMI) — only if you put down less than 20% on a conventional loan.
- HOA dues — only on some townhomes, condos, and newer subdivisions.
Lenders call the core four PITI. Leave out taxes and insurance and you’ll underestimate your payment by $600 to $700 a month on a home this size.
The real numbers on a $400,000 Sioux Falls home
Here’s what a $400,000 purchase looks like at a 7.32% 30-year fixed rate, which is where Freddie Mac’s Primary Mortgage Market Survey put the national average in its October 22, 2026 release. These include estimated Sioux Falls property taxes and insurance:
| Down payment | Loan amount | Principal & interest | Taxes + insurance (est.) | PMI (est.) | Estimated total/mo |
|---|---|---|---|---|---|
| 5% ($20,000) | $380,000 | ~$2,610 | ~$685 | ~$220 | ~$3,515 |
| 10% ($40,000) | $360,000 | ~$2,473 | ~$685 | ~$150 | ~$3,310 |
| 20% ($80,000) | $320,000 | ~$2,198 | ~$685 | $0 | ~$2,880 |
Your actual rate depends on your credit, loan type, and the day you lock, so treat these as a well-grounded estimate rather than a quote. If $400,000 is stretching your budget, the math on a $300,000 Sioux Falls home drops the payment by roughly $550 to $700 a month.
Your down payment is the biggest lever
Notice the spread in that table: the same house swings about $635 a month between 5% down and 20% down. Two things drive that.
First, a bigger down payment means a smaller loan, so less interest. Second — and this is the one buyers forget — 20% down erases PMI entirely. On a conventional loan, private mortgage insurance runs roughly 0.5% to 0.9% of the loan per year until you reach 20% equity. On a $380,000 loan, that’s real money every month for years.
That doesn’t mean you should drain your savings to hit 20%. Putting less down keeps cash in your pocket for closing costs, moving, and repairs — and in Sioux Falls, your buyer closing costs typically add another 2% to 5% of the price on top of the down payment. The right call depends on how much cash you have and how long you plan to stay.
Taxes and insurance — the lines buyers underestimate
On a $400,000 owner-occupied home, plan on roughly $4,400 to $4,700 a year in property taxes — about $370 to $390 a month. South Dakota taxes property at an effective rate of a little over 1% of market value, and the owner-occupied classification shaves the school general-fund levy off your primary residence. Your exact bill depends on whether the home sits in Minnehaha or Lincoln County, which is worth understanding before you buy — I break that down in Sioux Falls property taxes by county.
Homeowners insurance is the line most buyers lowball. In Sioux Falls it averages closer to $3,000 to $3,700 a year — well above the national figure — mostly because of hail. That’s another $250 to $310 a month in your escrow. Here’s the full picture on what drives a Sioux Falls insurance quote.
How to bring the payment down
If the number feels high, you have a few real levers — and in 2026’s market, buyers have more room than they did a year ago:
- Buy down the rate. Builders are especially aggressive here. With more new-construction inventory around Tea, Harrisburg, and the southeast growth corridor, many builders are offering rate buydowns and closing-cost credits that can cut your effective payment well below the table above.
- Put more down to shrink the loan and clear PMI sooner.
- Shop lenders. A quarter-point difference on a $380,000 loan is about $60 a month for the life of the loan — worth more than one phone call.
- Consider a 15-year loan if the budget allows. The rate is lower (6.68% in the same October survey), though the payment is higher.
Frequently Asked Questions
How much do you need to make to afford a $400,000 house in Sioux Falls?
Most buyers need roughly $110,000 to $130,000 in household income to comfortably carry a $400,000 home here, depending on your down payment, debts, and rate. Lenders generally want your total housing payment under about 28% of your gross monthly income, with room for car loans and other debt under 43%.
How much is a 20% down payment on a $400,000 house?
A 20% down payment on a $400,000 home is $80,000, and it’s what lets you avoid PMI on a conventional loan. Plan on another 2% to 5% of the price — roughly $8,000 to $20,000 — for closing costs on top of that.
What credit score do you need for a $400,000 mortgage?
You can qualify with a 620 credit score on most conventional loans and as low as 580 on an FHA loan, but a higher score gets you a lower rate — which matters a lot on a loan this size. On a $380,000 loan, even a quarter-point rate difference changes your payment by about $60 a month.
Is $400,000 a lot for a house in Sioux Falls?
It’s above the median. The median Sioux Falls sales price was $344,600 in September 2026, so $400,000 lands you in move-up and newer-construction territory — more square footage, newer finishes, or a lot in one of the growth corridors.
Will my monthly payment change after closing?
The principal and interest stay fixed on a fixed-rate loan, but your taxes and insurance can rise over time, which nudges your escrow payment up at the annual review. On the flip side, your PMI drops off once you reach 20% equity, which lowers the payment.
The bottom line
A $400,000 Sioux Falls home runs about $2,900 a month with 20% down and up to roughly $3,500 with 5% down once PMI and escrow are included — and your down payment is the single biggest lever on that number. The only way to know your real payment is to run it against today’s rate, your credit, and the specific home and county you’re buying in.
That’s exactly the kind of math I walk buyers through before we start touring. Grab my free Sioux Falls Buyers Guide for the full step-by-step, and if you want a personalized payment and affordability breakdown for your situation, reach out anytime — no pressure.
About Tyce Ortman
Tyce Ortman is a residential real estate agent with The Jeff Merrill Team at eXp Realty, serving Sioux Falls, South Dakota and surrounding communities including Brandon, Harrisburg, Tea, Canistota, and Madison. He works with both buyers and sellers, guiding them from the first search or listing all the way through closing. Reach Tyce at (605) 413-7903 or on Instagram and Facebook.
Sources
- Freddie Mac, Primary Mortgage Market Survey — 30-year fixed 7.32%, 15-year fixed 6.68% (released October 22, 2026).
- Realtor Association of the Sioux Empire, September 2026 Sioux Falls market report via SiouxFalls.Business (median sales price $344,600).
- Minnehaha County, South Dakota — property tax levies and owner-occupied classification (verify your parcel’s levy and county).
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