NYC Affordability

Income is only one of two constraints

Every NYC purchase gets capped by two independent ceilings: how much cash you can bring (down payment, closing costs, and for a co-op, post-closing reserves) and how much a board or lender will approve based on your income. Whichever ceiling is lower is your real limit — a high income doesn’t help if you don’t have the cash, and a large down payment doesn’t help if your income can’t clear the debt-to-income bar. This guide is about the income side specifically; see the co-op reserve guide for the cash side.

The formula

Annual income needed = (monthly mortgage P&I + monthly carrying cost) × 12 ÷ DTI ceiling

The DTI ceiling is the variable that changes the most between purchase types — and it changes the answer by a lot.

The DTI ceiling depends on what you’re buying

• Co-op boards: typically cap debt-to-income at 28%, the long-standing NYC standard (some outer-borough buildings allow 30–35%; conservative Fifth/Park Avenue buildings can cap as low as 20–25%).
• Condo lenders: typically underwrite to a back-end DTI of 43% (standard conforming), with 36% as a more conservative target some lenders and buyers prefer.

That’s not a small gap. A condo lender’s standard ceiling is roughly 1.5x looser than a co-op board’s standard ceiling, applied to the same monthly payment.

Worked example: identical price, two different answers

Take a $700,000 purchase, 20% down ($140,000), a $560,000 loan, and a $1,200/month carrying-cost assumption (maintenance for a co-op, or common charges plus property taxes for a condo):

Scenario	Monthly P&I	Monthly housing cost	DTI ceiling	Annual income needed
Co-op (6.25% rate, board DTI)	$3,448	$4,648	28%	$199,201
Condo (6.30% rate, lender DTI)	$3,466	$4,666	43%	$130,221
Condo (6.30% rate, conservative DTI)	$3,466	$4,666	36%	$155,542

The mortgage payment is nearly identical in all three rows — the mortgage rates are within 5 basis points of each other. The $69,000 difference between the co-op and standard-condo income requirement comes entirely from which DTI ceiling applies, not from anything about the property itself. That’s just the income side, too — see our co-op vs condo cost guide for how the two also differ on closing costs and resale fees.

A real-world calibration point

This site’s own co-op calculator, using the citywide median co-op sale price (~$506,000, Q1 2025 — StreetEasy/Baruch CUNY) and the standard 28% board DTI, puts the minimum qualifying income at roughly $150,000. That’s before accounting for a board’s reserve requirement, which is a separate, cash-side hurdle on top of the income number — see the reserve guide for how that math works.

What actually moves the number

A few levers change the required income, and they’re not all equally effective:

• A bigger down payment lowers the loan amount and therefore the monthly P&I — but it doesn’t touch which DTI ceiling applies, so it helps at the margin without closing a 28%-vs-43%-sized gap.
• Paying off other debts helps more than people expect on the co-op side specifically, since board DTI calculations typically fold in car payments, student loans, and other recurring obligations, not just the housing payment. Condo lenders do the same for a full mortgage-qualification DTI, but a co-op board’s number tends to be less forgiving of any other debt sharing the 28% ceiling.
• A different building changes the ceiling itself. Outer-borough co-op boards sometimes allow 30–35% DTI instead of 28%; a lender open to a 43% back-end DTI instead of holding to a conservative 36% target does the same thing on the condo side.
• Interest rate matters, but less than the DTI ceiling does in this comparison — the rate gap between the co-op and condo rows above is under a tenth of a percentage point, while the DTI gap alone accounts for the full $69,000 swing.

Why this matters more than people expect

Two buyers with identical savings and identical target price can have completely different outcomes depending on whether they’re shopping co-ops or condos — not because of anything about their finances, but because of which entity is doing the underwriting. If your income clears a condo lender’s 43% but not a co-op board’s 28%, that’s not a sign you can’t afford to buy in NYC — it’s a sign you’re looking at the wrong property type for your income profile. Run your actual numbers through both the co-op and condo calculators before ruling either out.