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Down Payment and Affordability: How the Size Changes Everything
Down payment effect on affordability on a $350,000 purchase at 7%: 3.5% down ($12,250, FHA): PITI + MIP = ~$2,877/month. 10% down ($35,000, conventional): PITI + PMI = ~$2,730/month; PMI cancels at 78% LTV (~year 10). 20% down ($70,000, no PMI): PITI = ~$2,338/month. 20% vs 10% saves $392/month; break-even on the $35,000 extra cash = 7.5 years. DPA programs can fund the gap. Own Luxury Homes® 12-Point Agent Integrity Audit™.
Down Payment and Affordability: How the Size Changes Everything
The down payment decision is the most leveraged single choice in homebuying — it affects monthly payment, mortgage insurance, interest rate, and the cash you have left for maintenance and emergencies. Here is the full comparison.
3.5% down (FHA) — $12,250 down, $337,750 loan (post-MIP financing):
• P&I at 7%: $2,248/month
• Monthly MIP (0.55%): $154/month
• MIP is permanent (until refinance if under 10% down)
• Upfront MIP: 1.75% = $5,911 financed into the loan
• Total monthly PITI + MIP (with $300 taxes + $175 insurance): ~$2,877/month
10% down (conventional) — $35,000 down, $315,000 loan:
• P&I at 7%: $2,097/month
• PMI (0.6% annual): $158/month, cancels at 78% LTV (approximately year 8-10 depending on appreciation)
• Total monthly PITI + PMI: ~$2,730/month
• PMI cancellation saves $158/month when it happens
20% down (conventional, no PMI) — $70,000 down, $280,000 loan:
• P&I at 7%: $1,863/month
• No PMI
• Potentially 0.125-0.25% lower rate (fewer LLPAs)
• Total monthly PITI: ~$2,338/month
• Monthly savings vs 10% down: $392/month
• Monthly savings vs 3.5% FHA: $539/month
The 20% down vs 10% down comparison requires a break-even analysis:
20% down saves $392/month vs 10% down.
But requires $35,000 more upfront.
Break-even: $35,000 ÷ $392/month savings = 89 months (7.5 years).
If you stay in the home 8+ years: the 20% down investment pays back.
If you move within 5-6 years: the 10% down option (lower cash outlay, free liquidity for other uses) likely wins.
The opportunity cost question: the $35,000 you did NOT put into the 20% down payment could be invested. At a historical 7% equity market return, $35,000 grows to approximately $70,000 in 10 years. Alternatively, it funds the emergency reserves and maintenance budgets that protect against the hidden costs above.
The liquidity argument for smaller down payments: a homeowner who put 20% down and has no savings is more financially fragile than one who put 10% down and has $35,000 in reserves. The down payment decision is not just about the monthly payment; it is about the complete financial picture post-closing.
Down payment interacts with loan type in ways that change total cost:
Under 3.5%: FHA only (3.5% is the minimum) or conventional if DPA or gift funds cover part of the 3-5% conventional minimum. No standard conventional loan below 3% down.
3.5-4.9%: FHA first choice at lower credit scores (580-679); conventional possible at 3% with strong credit (HomeReady, Home Possible programs). MIP vs PMI comparison is critical here.
5-9.9%: conventional or FHA; conventional wins at 720+ credit scores (cheaper PMI); FHA wins at 580-679 (score-blind MIP vs score-priced PMI).
10-19.9%: FHA MIP cancels at 11 years with 10%+ down; conventional PMI cancels at 78% LTV. Conventional typically preferred above 680 credit.
20%+: conventional, no PMI; best available pricing. The target for buyers with sufficient savings and strong holding periods.
DPA programs can change this entire matrix: many state programs cover the 3-5% down payment gap, allowing buyers to reach conventional or FHA qualifying down payments with minimal cash while reserving savings for closing costs and maintenance reserves.
How does down payment affect mortgage payment?
Every 1% increase in down payment reduces the loan balance by 1% of the purchase price, reducing P&I proportionally, and once 20% is reached, eliminates PMI entirely. On a $350,000 home: 3.5% down = ~$2,248 P&I + $154 MIP = $2,402 for principal/insurance; 10% down = $2,097 P&I + $158 PMI = $2,255; 20% down = $1,863 P&I, no PMI. The 20% vs 10% down payment saves $392/month; the break-even on the additional $35,000 upfront investment is approximately 7.5 years at that savings rate.
Is it better to put 20% down on a house?
It depends on your financial position and holding period. Advantages of 20% down: no PMI, potentially lower rate, $200-$400/month savings, and lower total interest. Disadvantages: depletes cash reserves, and the extra money tied up in the home earns the home's appreciation rate rather than remaining liquid. For buyers with substantial savings beyond the down payment: 20% down is often optimal for long-term holders (8+ years). For buyers where the 20% down would deplete reserves: 10-15% down with strong savings reserves is often safer. DPA programs that cover the down payment gap should always be evaluated before using savings for the down payment.
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