Putting 20% down on a $450,000 house means writing a check for $90,000. That’s a significant sum that takes years to save — but it eliminates PMI and gives you instant equity in your home.
The good news? You don’t necessarily need 20% down. Many buyers purchase $450K homes with 5-10% down, accepting PMI in exchange for buying sooner. This guide breaks down all your options.
Down Payment Amounts on a $450K House
| Down Payment % | Amount | Loan Amount | PMI Required? | Notes |
|---|---|---|---|---|
| 3% | $13,500 | $436,500 | Yes | FHA or conventional |
| 5% | $22,500 | $427,500 | Yes | Common first-time buyer |
| 10% | $45,000 | $405,000 | Yes | PMI lower than 5% down |
| 15% | $67,500 | $382,500 | Yes | Close to avoiding PMI |
| 20% | $90,000 | $360,000 | No | No PMI required |
| 25% | $112,500 | $337,500 | No | Best rates possible |
The 20% rule: Putting 20% down isn’t just about avoiding PMI — it also means better interest rates, lower monthly payments, and immediate equity as a buffer against market downturns. However, if it means waiting 5+ more years to buy, the tradeoffs may not be worth it.
How Down Payment Affects Your Monthly Mortgage
At 6.5% interest on a 30-year fixed mortgage:
| Down Payment | Loan Amount | P&I Payment | PMI (~0.5%) | Total Payment |
|---|---|---|---|---|
| 3% ($13,500) | $436,500 | $2,759 | $182 | $2,941 |
| 5% ($22,500) | $427,500 | $2,702 | $178 | $2,880 |
| 10% ($45,000) | $405,000 | $2,560 | $169 | $2,729 |
| 20% ($90,000) | $360,000 | $2,275 | $0 | $2,275 |
Putting 20% down saves $605/month compared to 5% down in principal, interest, and PMI. That’s $7,260 per year — meaningful savings that accumulate quickly.
Use our mortgage payment calculator to run your own scenarios with different rates and terms.
Total Interest Paid Over Loan Life
The difference in total cost is even more dramatic over 30 years:
| Down Payment | Loan Amount | Total Interest (30-yr, 6.5%) | Total Cost |
|---|---|---|---|
| 5% ($22,500) | $427,500 | $544,800 | $972,300 |
| 10% ($45,000) | $405,000 | $516,100 | $921,100 |
| 20% ($90,000) | $360,000 | $458,700 | $818,700 |
20% down saves $86,100 in interest compared to 5% down — enough to fund a solid retirement account or pay for a child’s college education.
How Long to Save $90,000 for 20% Down
Saving for a 20% down payment takes time. Here’s how long it takes at various savings rates, assuming you’re putting aside money in a high-yield savings account earning ~4%:
| Monthly Savings | Time to $90,000 | Notes |
|---|---|---|
| $1,000/month | 6.5 years | Modest pace |
| $1,500/month | 4.5 years | Reasonable goal |
| $2,000/month | 3.5 years | Aggressive saver |
| $2,500/month | 2.8 years | Dual income, no kids |
| $3,000/month | 2.4 years | Very aggressive |
If waiting 5+ years isn’t realistic, consider buying sooner with 10% down — you’ll pay PMI temporarily but build equity instead of paying rent.
Income Needed to Afford a $450K House
Lenders typically require your housing costs (PITI) to be under 28% of gross income:
| Down Payment | Monthly PITI | Required Income |
|---|---|---|
| 5% ($22,500) | $3,450 | $148,000 |
| 10% ($45,000) | $3,250 | $139,000 |
| 20% ($90,000) | $2,800 | $120,000 |
See our detailed guide on income needed for a $450K house for more scenarios.
Alternatives to 20% Down
If $90,000 feels out of reach, consider these options:
| Loan Type | Down Payment | Best For |
|---|---|---|
| FHA Loan | 3.5% ($15,750) | Lower credit scores |
| Conventional | 5% ($22,500) | Good credit, fast buyers |
| VA Loan | 0% | Veterans and military |
| USDA Loan | 0% | Rural areas |
| 80/10/10 | 10% | Avoid PMI with two loans |
Related Guides
- Down payment on a $400K house
- Down payment on a $500K house
- $450K mortgage monthly payment
- How to save for a down payment
- Closing costs on $450K house
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