At 7% for 30 years with 10% down, principal and interest on a $270,000 loan is about $1,797/month. Add East Tennessee property taxes (~$158/mo) and insurance (~$100/mo) and your all-in estimate is roughly $2,055/month. Use the calculator for your exact numbers.
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Why East Tennessee payments are lower than the national average
Tennessee has no state income tax and one of the lowest property tax rates in the country. Washington County (Johnson City) effective rate is roughly 0.60–0.65% annually — compared to a national average around 1.0–1.1%. On a $300,000 home that's about $50–60/month less in taxes than the national norm. That difference compounds over 30 years into meaningful savings.
Loan programs that affect your payment
Your mortgage program changes the payment significantly. A VA loan has no PMI — saving $150–200/month on a typical Tri-Cities purchase. A FHA loan adds MIP of about $138/month on a $300,000 loan. Conventional loans add PMI until you hit 20% equity, then it drops. For VA-eligible buyers, the VA loan almost always wins on total monthly cost. Use the program-specific calculators to compare.