"How long until I can buy a house?" is one of the most common money questions, and the usual answer ("it depends") is not very useful. So let's work through one real example, step by step, with numbers you can swap for your own.
Step 1: Decide what "down payment" actually means for you
The 20% down payment is the number everyone quotes, but it is not a rule. Many buyers put down 10%, 5% or even 3.5%, depending on the loan type. On a $350,000 home that looks like this:
| Down payment | Amount |
|---|---|
| 3.5% | $12,250 |
| 5% | $17,500 |
| 10% | $35,000 |
| 20% | $70,000 |
The gap between 10% and 20% is $35,000. For many households that is years of saving, so the choice of target matters more than almost anything else in this plan.
For the rest of this example we'll use 10% down = $35,000.
Step 2: Add the cash people forget
The down payment is not the only cash you need on closing day. Budget for:
- Closing costs: usually 2% to 5% of the price. On $350,000 that is $7,000 to $17,500. We'll use 3% ($10,500).
- Moving costs and a small cushion: say $2,000 for movers, deposits and the first trip to the hardware store.
So the real savings goal is:
$35,000 + $10,500 + $2,000 = $47,500
That is more than a third higher than the down payment alone. Planning for $35,000 and discovering $47,500 is how people end up draining their emergency fund at the last minute.
Step 3: Subtract what you already have
Say you already have $15,000 saved for the house. The gap is:
$47,500 - $15,000 = $32,500
Step 4: Work out the timeline
Now the actual question. If you save $1,000 a month and keep the money in a high-yield savings account earning about 4% APY:
- It takes about 30 months (two and a half years) to reach $47,500.
- Interest adds roughly $3,000 over that period.
- Without interest it would take about 33 months, so a good savings account buys you about three months.
Thirty months is long, but it is a real date on a calendar, which is a lot easier to commit to than "someday".
Step 5: Or work backwards from a deadline
Maybe your lease ends in three years and you want to buy by then. Flip the question: how much do you need to save each month to hit $47,500 in 36 months, starting from $15,000 at 4%?
The answer is about $801 a month.
This is often the more useful number, because you can test it against your budget right now. If $801 fits, set up an automatic transfer on payday and you're done. If it doesn't, you have three levers:
- Extend the deadline. Every extra month lowers the monthly amount.
- Lower the target. A cheaper home or a 5% down payment shrinks the goal fast.
- Find the money. Cancelled subscriptions, a side income, or redirecting a raise straight into the house fund.
Step 6: Understand the PMI trade-off
With less than 20% down on a conventional loan, lenders usually charge private mortgage insurance (PMI). A common range is about 0.5% to 1.5% of the loan per year.
In our example the loan is $315,000, so PMI would be roughly $131 to $394 a month, added to the mortgage payment until you reach about 20% equity.
That sounds bad, but compare it to the alternative: saving an extra $35,000 to reach 20% could take close to three more years at $1,000 a month, while home prices and rents keep moving. For some people paying PMI for a few years is the cheaper path; for others it is worth waiting. The point is to make the choice on purpose, with the numbers in front of you.
A quick checklist
- Pick a realistic down payment percentage, not automatically 20%.
- Add 2-5% for closing costs, plus moving costs.
- Subtract what you already have saved.
- Choose either a monthly amount (to get a date) or a date (to get a monthly amount).
- Keep the money somewhere safe and boring, like a high-yield savings account. Not the stock market if you're buying within a few years.
- Keep your emergency fund separate. The house fund is not your emergency fund.
Run your own numbers
I built a free down payment calculator that does all of the above: it adds closing costs and moving money, shows how many months until you reach the goal and the target date, calculates the monthly amount for a deadline, compares 3.5%, 5%, 10% and 20% down, and flags PMI when you're under 20%. No signup, nothing stored:
Change the price, the percentage and your monthly saving, and you'll have your own answer to "how long will it take?" in about a minute.
This is general education, not financial advice. Loan rules, PMI rates and closing costs vary by lender and location.
Top comments (0)