$390,000 buys the median home in Derry right now. With 20% down, that's a $78,000 down payment and a $312,000 loan, set against a $78,000 median household income.
Property taxes in Derry run 2.05% of assessed value, above the 1.1% national average. On the median home, that's $7,995 a year, or $666 added to the monthly payment.
No state income tax in New Hampshire means the $78,000 median household income stretches further than the same salary would in an income-tax state, which matters directly against a $2,862/month payment.
Day-to-day expenses in Derry track at 110 against the national 100 baseline, above average once you look past the mortgage payment itself.
Derry's median home price runs 3% higher than nearby Manchester: $380,000 there versus $390,000 here.