Quick Summary: $700K Loan at 7% = $4,657/Month
Quick Summary: A $700,000 loan on a 30-year fixed at 7% costs $4,657 a month in principal and interest. At today's actual rate — 6.95%, the Freddie Mac average for the week ending September 17, 2026, the highest since January 2025 (Reuters, September 17, 2026) — the payment is $4,634 a month. That is principal and interest only. Add Fairfax County property tax ($1.12 per $100 of assessed value, the FY2027 adopted rate) and a typical Virginia homeowner's insurance premium, and the real monthly check for an $875,000 purchase with 20% down lands near $5,617. Over 30 years, a $700,000 loan at 6.95% costs about $1.67 million total — roughly $968,000 of it interest.
What Does $700K Borrow Buy in NoVA?
What does a $700,000 loan buy in Northern Virginia? With 20% down, it borrows an $875,000 home — squarely in Fairfax and Loudoun's 2026 sweet spot. With 10% down, about $778,000; with 3.5% down FHA, about $725,000. This loan size fits standard conforming limits, which is why it is so common: it covers updated townhomes and single-family homes across Fairfax, Arlington, Ashburn, and Vienna without touching jumbo territory. The rate ladder matters more than the loan size — and it moved again this week.
P&I Math: 6.35% vs 6.76% vs 6.95%
Principal and interest on $700,000 over 30 years: 6.35% (a year ago) — $4,356 a month, $1,568,034 total; 6.71% (September 3) — $4,522 a month; 6.76% (September 10) — $4,545 a month; 6.95% (today) — $4,634 a month, $1,668,109 total. The 6.95%-vs-7% question barely matters: $4,634 vs $4,657 is a $23-a-month rounding difference. What matters is the trend — four straight weeks of rising rates, with the 19-basis-point jump the largest one-week move in 16 months (CNN, September 17, 2026). Versus a year ago, the same loan costs $278 more a month — about $100,075 over 30 years.
The Full Check: Tax, Insurance, PMI
Now the rest of the check. Property tax: Fairfax County's FY2027 adopted rate is $1.12 per $100 of assessed value (Board of Supervisors budget markup, April 28, 2026 — fairfaxcounty.gov). On an $875,000 assessment, that is $9,800 a year, or $817 a month. Homeowner's insurance: Virginia averages $1,740 a year for $300,000 in dwelling coverage (Insurify, 2026) and $2,265 for $400,000 (NerdWallet, 2026) — a NoVA home at this price needs more coverage, so budget about $2,000 a year, roughly $167 a month. Private mortgage insurance: zero with 20% down. Below 20% down, conventional PMI typically runs 0.5% to 1% of the loan per year ($290–$580 a month on $700,000) — confirm your quote with your lender. Total: $4,634 + $817 + $167 ≈ $5,617 a month.
What Income Qualifies?
What income qualifies for $5,617 a month? Lenders typically cap housing costs at 28% of gross monthly income — the front-end ratio — which puts qualifying household income near $241,000 a year. The back-end ratio, usually 36% to 45%, counts all debts: car payments, student loans, and card minimums all shrink the mortgage you qualify for. In Northern Virginia, where two-car households and student debt are common, the back-end test is the one that surprises buyers. Run both ratios with a lender before you shop.
The 15-Year Shortcut: Save ~$599K in Interest
The 15-year shortcut: Freddie Mac's 15-year average was 6.09% as of September 10, 2026. A $700,000 loan at 6.09% over 15 years runs $5,941 a month — $1,307 more than the 30-year — but the lifetime total is about $1.07 million versus $1.67 million, saving roughly $599,000 in interest. It is a wealth strategy, not a payment strategy. Most take the 30-year and prepay.
Lock or Float This Week?
Should you lock today? After our September 14 lock-vs-float guide, this week leans lock: four straight weeks higher, the biggest weekly jump in 16 months, and purchase applications down 19% from a year ago (Mortgage Bankers Association via CNN). A lock protects your payment while you shop; a float bets on cooler inflation data. Get quotes from at least three lenders — shopping around can save thousands, and on $700,000, an eighth of a point is about $61 a month.
FAQ: $700K Loans at 7% in 2026
What this means for your offer — Cornerstone analysis from 5 to 10 closes a month as a team, not a county stat. At these rates, payment math runs the market: listings priced where the PITI fits a clear income band draw the showings; aspirational pricing sits. Sellers, the buyer pool just shrank at the margin — 19% fewer purchase applications than a year ago — so condition and pricing precision matter more than upgrades. Buyers, the base payment is $4,634 whether the home is in Fairfax or Ashburn; taxes and insurance shift by address, so compare total monthly cost, not sticker price. No price promise; rates move weekly. God Family Business.
Sources & Next Step
Sources: Freddie Mac PMMS via Reuters, 30-yr 6.95% as of September 17, 2026 (highest since January 2025); CNN, September 17, 2026 (MBA purchase apps -19% YoY, refis -65%); Freddie Mac via GlobeNewswire, September 10 (6.76%) and September 3 (6.71%); Fairfax County FY2027 Adopted Budget, Board markup April 28, 2026 ($1.12/$100; $9,294.82 typical bill); Insurify 2026 ($1,740/yr VA avg); NerdWallet 2026 ($2,265/yr). Payments by standard amortization at stated rates; taxes at the adopted Fairfax rate on purchase price; insurance estimated. Confirm with your lender and tax advisor. Running the math on a real Fairfax, Arlington, or Vienna listing? Text (571) 441-1031 — Cornerstone Realty Group — for a 5-minute call: we will run your exact payment, PMI, and tax numbers on the address, or a free home valuation at /home-valuation/. ★★★★★ 5.0 team only. GA4 G-S6CE02DP9S and Meta Pixel 990042980225967 single-fire guard __cornerstoneTrackingInit intact.
FAQ
What is the monthly payment on a $700,000 mortgage at 7%?
About $4,657 a month at exactly 7%; about $4,634 at today's actual 6.95% (Freddie Mac, September 17, 2026). Fairfax County taxes and insurance add roughly $984, for a total near $5,617.
How much house can I buy with a $700,000 loan in Northern Virginia?
With 20% down, an $875,000 home; 10% down, about $778,000; 3.5% down FHA, about $725,000. Lenders typically qualify at a 28% front-end ratio — about $241,000 in household income — and check total debts at 36% to 45%.
What is the Fairfax County property tax rate in 2026?
The FY2027 adopted rate is $1.12 per $100 of assessed value (Board of Supervisors, April 28, 2026) — $9,800 a year on $875,000 assessed; the county's typical bill is $9,294.82.
Should I lock my mortgage rate or float?
With four straight weekly increases and the biggest weekly jump in 16 months (CNN, September 17, 2026), locking protects your payment. Get quotes from at least three lenders — on $700,000, an eighth of a point is about $61 a month.