Boston, MA vs San Diego, CA Cost of Living (2026)

Boston has a cost of living index of 148.4, about 48.4% above the national average. Housing is a major driver here, with a housing index of 221.2. Typical apartment rent is about $4,225 a month, and median home values are around $1,082,320. The median household income is approximately $84,000.

A $100,000 salary in an average-cost city buys about $67,400 worth of lifestyle in Boston. That usually means smaller apartments, tighter savings margins, or a longer commute if you want to keep housing costs in check. Outside housing, utilities and healthcare also run above the national baseline.

Groceries in Boston run about 15 to 20% above the national average. Healthcare costs are elevated as well, which is partly a function of the city being a major medical hub with large academic hospitals. Utility costs, particularly heating in winter, are another above-average expense. Natural gas and electric bills can be notably high from November through March.

Massachusetts has a flat state income tax of 5%, plus a 4% surtax on income above $1 million. For most workers, the effective state tax burden is around 5%, which is moderate compared to states like California or New York. Boston's MBTA transit system covers much of the metro area, and many workers avoid car ownership entirely, particularly those living within the core neighborhoods. That transit access provides real financial relief for households that can make the trade.

San Diego has a cost of living index of 147.3, about 47.3% above the national average. Housing is a major driver here, with a housing index of 209.6. Typical apartment rent is about $3,111 a month, and median home values are around $1,145,226. The median household income is approximately $80,000.

A $100,000 salary in an average-cost city buys about $67,900 worth of lifestyle in San Diego. That usually means smaller apartments, tighter savings margins, or a longer commute if you want to keep housing costs in check. Outside housing, utilities and transportation also run above the national baseline.

California's income tax applies fully in San Diego. For a single filer earning $100,000, the marginal state rate is 9.3%. The effective state tax rate at that income level runs around 5 to 6%, and combined with federal income tax and FICA, take-home pay is substantially lower than gross salary. Someone moving from a no-income-tax state like Texas or Florida will notice this immediately in their first paycheck.

Groceries in San Diego run roughly 15 to 20% above the national average. The climate is mild year-round, which reduces heating and cooling costs compared to cities in more extreme climates. Utility bills are moderate relative to San Francisco. One specific housing dynamic worth noting: the San Diego rental market has a relatively low vacancy rate, and renters who move frequently face the risk of resetting to current market prices. Long-term renters in rent-stabilized buildings have enjoyed some protection, but California's AB 1482 rent cap of 5% plus CPI still allows meaningful annual increases.