The Big Items
Let's start with the elephant in the room: housing. If you are looking to buy, the median home price of $479,000 is just the starting line, not the finish line. In Mount Vernon, specifically in the more desirable Fleetwood or Chester Hill sections, that $479k often gets you a home that needs immediate attention. You aren't just buying a house; you are inheriting a project. The "fixer-upper" market here is aggressive. If you are financing this with a standard 30-year fixed mortgage at a conservative 6.5% interest rate, you are looking at a monthly principal and interest payment hovering around $3,028. But that is the cheap part. You then have to tack on Westchester’s notoriously high property taxes. In this market, you can expect an annual tax bill of roughly $12,000 to $15,000. That adds another $1,000 to $1,250 a month to your housing overhead. Suddenly, your "median" home is costing you over $4,200 a month just to exist in it. If you don't have a $95,000 down payment sitting around, you are stuck renting.
Rental data for Mount Vernon is notoriously opaque, often withheld from public aggregators to keep the market fluid, but we can triangulate the cost. A decent 2-bedroom apartment in a non-crime-ridden building will easily run you $2,800 to $3,200 a month. Landlords here know the game: they price units assuming you are commuting to NYC and saving on the subway fare. There is no "bang for your buck" in the rental market here; you are paying for the zip code and the train station proximity. If you are looking for a "deal," you will likely end up in an older building with zero amenities and drafty windows, which leads to another hidden cost: heating. With the local electric rate at 24.43 cents/kWh (which is significantly higher than the national average), running the heat or the A/C in an older, poorly insulated unit can easily add $200 to $300 a month to your utility bills during peak seasons.
Taxes are the other massive bleed. New York State income tax is a progressive sludge that starts taking a chunk of your paycheck immediately. For a single earner making around $42,000, you are looking at a marginal state tax rate of roughly 5.5%, effective. But the real kicker is the property tax if you buy. Westchester has some of the highest property taxes in the country because of the heavy burden of school taxes and municipal services. It is not uncommon for the annual property tax bill to exceed the $12,000 mark on a modest home. That is $1,000 a month that you do not get back, you do not build equity on it, and it generally rises faster than inflation. If you are a renter, you are still paying these taxes; they are just baked into your rent, along with the landlord’s mortgage and profit margin.
As for daily consumables, Groceries and Gas in Mount Vernon hover slightly above the national baseline. You aren't getting the "sticker shock" of Manhattan prices, but you are paying a premium compared to the rest of the US. Expect to pay roughly $4.20 per gallon of gas, depending on the station near the Hutchinson River Parkway. Groceries are a similar nickel-and-dime affair; a standard run to ShopRite or Stop & Shop for a week's worth of food for one person will likely run you $120 to $150. There is a local variance where the closer you get to the Bronx border or the New Rochelle line, the prices at the local bodegas creep up by 10% to 15% on staples like milk and bread.