Where the 20% rule actually comes from
Twenty percent down isn't a law, a lending minimum, or a magic number that unlocks homeownership. It's the threshold at which conventional lenders stop requiring private mortgage insurance, because at that point your equity cushion is considered large enough to protect the lender if you default. That's it. It's a PMI rule that got mistaken for a universal requirement somewhere along the way.
In reality, most first-time buyers put down far less. FHA loans require as little as 3.5%. Some conventional programs go as low as 3%. VA loans, for eligible veterans and service members, and USDA loans, in eligible rural and some suburban areas, can require 0% down entirely. The real question isn't "how do I get to 20%" — it's "what's the right down payment for my specific loan program, timeline, and risk tolerance."
The math behind your savings timeline
Once you've picked a target percentage, the savings math is straightforward compound growth.
Down payment goal
Down Payment = Home Price × Down Payment %
Monthly savings growth
Balance = Balance × (1 + APY / 12) + Monthly Contribution
Run that forward month by month, starting from your current balance, until it crosses your goal. The interest your savings earn matters more than people expect — moving a down payment fund from a checking account near 0% to a high-yield savings account near 4-5% can meaningfully shorten the timeline on its own, with zero change to how much you contribute.
PMI cost, if you go below 20%
Monthly PMI ≈ (Loan Amount × PMI Rate) ÷ 12
PMI rates commonly range from about 0.3% to 1.5% of the loan amount annually, depending on your credit score, down payment size, and loan type. It's usually removable once you reach 20% equity, either through paydown or appreciation.
What actually determines your minimum
- Loan program. Conventional, FHA, VA, and USDA all have different minimums — this is the single biggest factor.
- Credit score. Lower-down-payment options often require a minimum credit score to qualify; dropping below it can push your required down payment higher.
- Property type. Second homes, investment properties, and multi-unit properties typically require larger down payments than an owner-occupied single-family home.
- Debt-to-income ratio. A higher existing debt load can push a lender to require more down payment to offset risk, even within the same program.
- Local assistance programs. State and city down payment assistance grants or second-lien programs can reduce what you need to bring yourself, if you qualify.
Three savings timelines, three down payment targets
All three examples use the same $420,000 home, $15,000 already saved, $1,200/month contribution, and 4% APY — only the target percentage changes.
Example A — 20% down, no PMI
Goal: $84,000. Starting from $15,000 and adding $1,200/month at 4% APY, this takes about 51 months (4.3 years) to reach — with no PMI once the loan closes.
Example B — 10% down, with PMI
Goal: $42,000. The same savings plan reaches this in about 21 months (1.8 years) — but the resulting $378,000 loan carries PMI, commonly $150-$300/month depending on rate and credit profile, until enough equity builds.
Example C — 3.5% down (FHA), with mortgage insurance
Goal: just $14,700. With $15,000 already saved from the examples above, this saver has already cleared the goal before their first month of additional saving — a useful illustration of how much lower FHA's minimum down payment is. FHA loans do carry their own mortgage insurance premium structure, which in some cases doesn't cancel automatically the way conventional PMI does, so it's worth checking current program rules before assuming it will drop off.
Run your own numbers, including your specific home price and savings rate, in the Down Payment Calculator.
Benefits of planning your down payment deliberately
✓ What you gain
- A real date instead of a vague savings goal
- Clarity on the true PMI tradeoff for your specific loan size
- A way to compare "buy sooner with PMI" against "wait and save more"
- Confidence that your monthly contribution is actually sufficient
- Early visibility into whether a high-yield account meaningfully helps
✗ What it can't decide for you
- Whether local home prices will still fit your target by the time you're ready
- Whether a gift, inheritance, or bonus might change your timeline unpredictably
- Your risk tolerance around keeping the fund in cash versus invested
- Eligibility for down payment assistance programs, which varies by location
- How mortgage rates might move between now and when you're ready to buy
Practical tips
Automate the contribution
A fixed automatic transfer on payday tends to outperform "saving what's left over" by a wide margin — consistency matters more than the exact dollar amount most months.
Compare buying sooner with PMI against waiting
If home prices in your target area are rising faster than you can save the gap to 20%, buying sooner with PMI can genuinely work out ahead financially. Run both scenarios rather than assuming waiting is automatically safer.
Don't forget closing costs sit on top of the down payment
Budget an additional 2-5% of the home price for closing costs — see the Closing Cost Calculator for a realistic estimate specific to your loan size.
Ask about down payment assistance before ruling it out
Many buyers assume they won't qualify and never check. State housing finance agencies and some employers offer programs worth a few minutes of research.
Keep the fund somewhere boring
A high-yield savings account, not the stock market, is the standard recommendation for money you'll need within a few years — a downturn shortly before your purchase could set your timeline back materially.
Build your savings timeline
See exactly how many months it will take to reach your down payment goal, with or without PMI.
Bottom line
Twenty percent down is a PMI threshold, not a requirement — treating it as the latter keeps a lot of ready buyers on the sidelines longer than necessary. The better question is which loan program fits your situation, what PMI or mortgage insurance would actually cost at a lower down payment, and whether buying sooner with insurance beats waiting years to reach 20%. Run your specific numbers in the Down Payment Calculator rather than defaulting to a rule of thumb.
Frequently Asked Questions
Do you really need 20% down to buy a house?
No. Conventional loans can go as low as 3 to 5 percent down, FHA loans typically require 3.5 percent, and VA and USDA loans can allow 0 percent down for eligible borrowers. 20 percent is only required to avoid private mortgage insurance on a conventional loan, not to qualify for one.
What is PMI and how much does it cost?
Private mortgage insurance protects the lender when a conventional loan has less than 20 percent down. It typically costs 0.3 to 1.5 percent of the loan amount annually, paid monthly, and can usually be removed once the loan reaches 20 percent equity.
What is the minimum down payment for an FHA loan?
FHA loans require a minimum of 3.5 percent down for borrowers with a credit score of 580 or higher. Borrowers with lower scores may need to put down 10 percent.
Can you buy a house with no money down?
Yes, in specific cases. VA loans allow qualifying veterans and service members to buy with 0 percent down, and USDA loans allow 0 percent down in eligible rural and some suburban areas. Both still require closing costs unless those are covered separately.
Should I put down more than the minimum if I can afford it?
It depends on the tradeoff between a lower monthly payment and keeping cash available for other goals or emergencies. A larger down payment lowers PMI and interest costs, but ties up capital that could otherwise be invested or held as a safety net.
How long does it typically take to save a 20% down payment?
It depends entirely on home price, current savings, and monthly contribution, but many buyers take three to seven years to reach a full 20 percent down payment on a median-priced home while saving consistently.
Can gift funds count toward a down payment?
Yes, most loan programs allow some or all of the down payment to come from a gift, typically from a family member, but lenders require a signed gift letter and documentation showing where the funds came from.
What are down payment assistance programs?
Many states, counties, and cities offer grants or low-interest second loans to help first-time or income-qualified buyers cover part of their down payment. Eligibility and amounts vary significantly by location.
Does a bigger down payment guarantee a lower mortgage rate?
Not directly, but many lenders offer modestly better pricing at certain down payment thresholds, since a larger down payment lowers the lender's risk. The effect is usually smaller than the effect of credit score.
Is it smarter to pay off debt first or save for a down payment?
High-interest debt, such as credit cards, is usually worth paying down first, since its interest rate almost always exceeds what a down payment fund would realistically earn. Lower-interest debt is more of a personal judgment call.
Where should down payment savings be kept while saving?
Most financial planners recommend a high-yield savings account or similar low-risk vehicle rather than the stock market for money needed within a few years, since a market downturn shortly before a purchase could set the timeline back significantly.
Does the down payment amount affect closing costs?
Indirectly. A smaller down payment means a larger loan, and some closing costs, such as loan origination fees, are calculated as a percentage of the loan amount, so they rise slightly as the loan amount rises. See the Closing Cost Calculator to compare scenarios.
What credit score do I need for a low down payment loan?
Requirements vary by program. Conventional loans with 3 percent down often require a credit score around 620 or higher, while FHA's 3.5 percent down option is generally available starting around 580.
Can I use retirement account funds for a down payment?
Some retirement accounts allow penalty-free early withdrawals or loans for a first home purchase up to certain limits, but rules vary by account type and doing so reduces retirement savings, so it is worth weighing carefully.
How do I calculate my own down payment savings timeline?
Use the free Down Payment Calculator on CalcPro, which projects month by month how your savings will grow toward your goal based on your current balance, monthly contribution, and account yield.