The 20% Rule Is a Myth, but It Has a Real Cost Behind It
The "20% down" rule comes from a real mortgage mechanic: on a conventional loan, putting down less than 20% usually means paying private mortgage insurance (PMI) until your equity grows. That extra monthly cost is the price of a smaller down payment, not a barrier to entry.
With mortgage rates hovering around 7% in the fall of 2026, the down payment you choose has an outsized effect on your monthly budget. All the examples below use a $350,000 purchase price and a 7.00% 30-year fixed rate, and show principal, interest, and PMI only. Property taxes and insurance are the same at any down payment, so they are left out.
👉 Test your own price and down payment with our free calculator →
3%, 5%, 10%, 15%, or 20% Down: The Monthly Cost
| Down Payment | Cash Needed | Loan Amount | Monthly (P&I + PMI) | vs. 20% Down |
|---|---|---|---|---|
| 3% | $10,500 | $339,500 | $2,259 + $240 = $2,499 | +$636 |
| 5% | $17,500 | $332,500 | $2,212 + $180 = $2,392 | +$529 |
| 10% | $35,000 | $315,000 | $2,096 + $118 = $2,214 | +$351 |
| 15% | $52,500 | $297,500 | $1,979 + $74 = $2,054 | +$191 |
| 20% | $70,000 | $280,000 | $1,863 + $0 = $1,863 | — |
Swipe sideways to see all columns. PMI rates are illustrative. Actual PMI depends heavily on your credit score and loan type, and commonly ranges from about 0.3% to over 1.5% of the loan per year.
Each extra 5% you put down trims roughly $100 to $190 per month from your payment at this price. The final step from 15% to 20% saves the most (about $191 per month) because it removes PMI entirely.
How Long Will You Pay PMI?
PMI is not forever on a conventional loan. You can request removal once your balance reaches 80% of the home's original value, and your lender must cancel it automatically at 78%, as long as you are current on payments.
Here is how long PMI lasts on the $350,000 example, assuming no price growth and no extra payments:
| Down Payment | Months Until 80% Loan-to-Value | Total PMI Paid |
|---|---|---|
| 3% | ≈ 140 (11.7 years) | ≈ $33,700 |
| 5% | ≈ 130 (10.8 years) | ≈ $23,400 |
| 10% | ≈ 101 (8.4 years) | ≈ $11,900 |
| 15% | ≈ 61 (5.1 years) | ≈ $4,500 |
| 20% | 0 | $0 |
Home price appreciation or extra principal payments can shorten these timelines considerably. A new appraisal after your home gains value can also support an earlier PMI cancellation request.
👉 Estimate your PMI and monthly payment →
Low Down Payment Loan Options
| Loan Type | Minimum Down | Key Rules |
|---|---|---|
| Conventional | 3% to 5% | 3% options exist for qualifying first-time or low-to-moderate income buyers; PMI can be removed |
| FHA | 3.5% | Credit score of 580+ for 3.5% down; mortgage insurance premium (MIP) applies |
| VA | 0% | For eligible veterans and service members; no monthly mortgage insurance |
| USDA | 0% | For eligible rural and suburban areas with income limits |
FHA example: a 3.5% down FHA loan on the same $350,000 home has a 1.75% upfront mortgage insurance premium (about $5,900, often rolled into the loan) and an annual premium of roughly 0.55%. That puts the monthly payment near $2,444, and on FHA loans with less than 10% down the premium generally lasts for the life of the loan unless you refinance.
For borrowers with lower credit scores, FHA can beat conventional. With strong credit, a conventional loan with 5% down often costs less over time.
How Long Does It Take to Save Each Down Payment?
Saving $1,000 a month into a savings account earning a hypothetical 4% APY, starting from zero:
| Goal | Down Payment Only | Down Payment + 3% Closing Costs |
|---|---|---|
| 3% down ($10,500) | 11 months | 21 months |
| 5% down ($17,500) | 18 months | 27 months |
| 10% down ($35,000) | 34 months | 43 months |
| 20% down ($70,000) | 64 months | 72 months |
Waiting to reach 20% instead of 10% in this example takes about 2.5 more years of saving. During that time, prices and rates can move in either direction, and you continue to pay rent. That trade-off is worth running through a rent-versus-buy comparison.
👉 Plan your down payment savings timeline →
The Lifetime Cost of Putting Less Down
A smaller down payment does cost more over the long run. On the same $350,000 home:
- Total interest on a 3%-down loan: about $473,600 over 30 years.
- Total interest on a 20%-down loan: about $390,600.
- Difference: roughly $83,000 in extra interest, before counting PMI.
Whether that is worth it depends on what you gain by buying sooner. If home prices rise 3% per year, waiting two years to save more could cost you more in higher prices than you save in interest. If you would be left with no emergency cash, a larger down payment might not be the safer choice either.
Common Mistakes to Avoid
- Draining every dollar for the down payment. Closing with no reserves leaves you exposed to a roof repair, job loss, or medical bill. Many advisors suggest keeping 3 to 6 months of expenses after closing.
- Forgetting closing costs. Budget about 2% to 5% of the purchase price on top of the down payment, or roughly $7,000 to $17,500 on a $350,000 home.
- Assuming PMI is wasted money. PMI lets you buy years earlier. Compare its cost against the cost of waiting.
- Ignoring gift and assistance programs. Many states and cities offer down payment assistance to first-time buyers, and family gifts are allowed on most loans with documentation.
- Comparing only the monthly payment. A lower down payment raises your loan size, interest cost, and PMI duration.
- Not shopping lenders. PMI quotes and rates can vary meaningfully between lenders, and the same borrower may get very different offers.
Frequently Asked Questions (FAQ)
Can I buy a house with 3% down?
Yes. Some conventional loan programs allow 3% down for qualifying first-time or low-to-moderate income buyers, and FHA loans allow 3.5%. You will pay mortgage insurance, so your monthly payment will be higher than with a larger down payment.
Is 10% down a good middle ground?
For many buyers, yes. At 10% down on a $350,000 home you reduce your payment by about $285 per month compared with 3% down, and PMI falls away in roughly 8 years. You also keep more cash for emergencies than you would with 20% down.
Does a bigger down payment get me a better interest rate?
Often. Lenders typically price lower-risk loans (lower loan-to-value) more favorably, so a larger down payment can reduce your rate along with eliminating or reducing PMI. Credit score has an equally large effect.
How much should I have left after closing?
Many financial planners suggest keeping at least three to six months of living expenses in cash after paying your down payment and closing costs. If that means a smaller down payment, it can be the safer choice.
Can I use a gift for my down payment?
Yes, in most cases. Lenders usually require a gift letter confirming the money is a true gift, not a loan, and may limit gift funds depending on your down payment size and loan type.
Do I need 20% down for an investment property?
Generally lenders require more for investment properties, often 15% to 25%, and rates are higher. Use a rental property calculator to check whether the numbers work at that down payment.
Conclusion & Recommended Next Steps
There is no single right down payment. Putting down 20% eliminates PMI and minimizes your lifetime cost, but a 5% to 10% down payment can get you into a home years sooner, as long as the payment fits your budget and your emergency fund stays intact. Run your own price, rate, and savings timeline through our tools before you start house hunting. For help choosing a price range first, read our guide on how much house you can afford on a $75,000 salary.
Down Payment Calculator
See how 5%, 10%, or 20% down changes your monthly mortgage burden.
Mortgage Payment Calculator
Calculate your monthly PITI, PMI, and full amortization schedule.
Savings Goal Calculator
Find out how long it takes to save your down payment.
Rent vs. Buy Calculator
Compare the cost of waiting to save more against buying now.
Disclaimer: This guide is intended solely for educational and informational purposes and does not constitute personalized financial, investment, legal, or tax advice. Mortgage interest rates, PMI pricing, loan program rules, and lender requirements change frequently, and the figures above are illustrations based on stated assumptions. Always consult a certified mortgage advisor or financial planner before signing loan agreements.