Saving for a House: The Full Cash Requirement, Not Just 20%

The number most people save toward is the down payment. The number that actually has to be in the account on closing day is considerably larger, and the gap between the two is where a lot of otherwise well-planned purchases stall three weeks before they complete.

A down payment is one line on the settlement statement. Around it sit closing costs, prepaid escrow items, the first month of ownership before any rent-equivalent rhythm establishes itself, moving expenses, and the repairs that reveal themselves within days of taking possession. None of that is optional, and none of it comes out of the mortgage.

What follows treats the whole cash requirement as one problem: what the total is, how the 20% threshold actually behaves, where to hold the money over different horizons, and how the arithmetic changes when prices move while you save.

#The 20% rule and what really changes below it

Twenty percent is not a legal minimum and never has been. It is the threshold at which conventional loans stop requiring private mortgage insurance. Programs exist with far lower requirements -- conventional loans as low as 3% for some borrowers, FHA loans at 3.5%, and VA and USDA loans with no down payment for those who qualify.

So the honest framing is not "you need 20%." It is "below 20% on a conventional loan you pay for mortgage insurance, and you will have less equity."

Private mortgage insurance (PMI) protects the lender, not you, against loss if you default. It is typically charged as a monthly premium added to your payment, and the cost varies with your down payment size, credit profile and loan type.

The mechanics that matter are the exit rules, because PMI is temporary. Under the federal Homeowners Protection Act, for most single-family principal residences with loans closed after July 1999:

• You may request cancellation once the principal balance is scheduled to reach 80% of the original value, provided you are current and meet the servicer's conditions.
• The servicer must automatically terminate it when the balance is scheduled to reach 78% of original value.
• If you reach the midpoint of the amortization schedule and PMI is still in place, it must end at that point.

Note "original value" -- generally the lesser of the sale price or the original appraised value. Appreciation does not automatically remove PMI, though many servicers will consider cancellation based on a new appraisal under their own rules.

FHA loans work differently. FHA mortgage insurance premiums follow their own schedule, and depending on the loan terms the annual premium can last the life of the loan, ending only through refinancing or payoff. That distinction is worth understanding before treating FHA and conventional as interchangeable.

Worked example: A $340,000 purchase with 10% down means a $306,000 loan. Suppose PMI is charged at 0.55% of the loan balance annually: $306,000 x 0.0055 = $1,683 a year, or about $140 a month. If the loan reaches 80% of the original $340,000 value -- a balance of $272,000 -- after roughly seven years of scheduled amortization, the total PMI paid is on the order of $140 x 84 months, or about $11,760, allowing for the fact that a balance-based premium declines slightly over time. Weigh that against what waiting to accumulate the extra $34,000 would cost in rent and in price movement over the same period. There is no universal winner; the variables are your rent, the local price trend and how long the extra saving would take.

#The full cash requirement

Beyond the down payment, expect these:

Closing costs. Lender fees, appraisal, credit report, title search, title insurance, recording fees, transfer taxes, attorney fees where required, and survey. These commonly land somewhere around 2% to 5% of the purchase price, but the range is wide and varies enormously by state -- transfer taxes in particular differ by an order of magnitude between jurisdictions. Federal rules require the lender to give you a Loan Estimate shortly after application and a Closing Disclosure at least three business days before closing, and comparing those two documents is the single most useful thing a buyer can do.

Prepaid items and escrow. These are not fees; they are your own future expenses collected in advance. Typically: prepaid interest from closing to month end, the first year of homeowners insurance paid upfront, and an escrow cushion of several months of property taxes and insurance. On a house with a $4,200 annual tax bill and $1,500 insurance, an escrow setup can easily be $2,000 to $3,000 on its own.

Earnest money. Paid at contract, credited toward your costs at closing. It is part of the total, not extra, but it must be liquid weeks before closing.

Moving costs. A local move with professional help runs into four figures; a long-distance move often several times that. Add utility deposits and any lease-break penalty.

Immediate repair and furnishing reserve. The item most often omitted. Nearly every purchase surfaces something within the first month: a failing water heater, a locksmith, a tree, appliances the sellers took with them. A reserve of 1% of the purchase price is a defensible starting point.

An intact emergency fund, held separately. Covered in its own section below.

The pattern is consistent: the true requirement runs roughly 1.5 to 2.2 times the down payment alone at low down payment percentages, and about 1.3 times at 20%. Anyone who has saved exactly the down payment has saved between half and three-quarters of what they need.

Note: Seller concessions and lender credits can reduce cash at closing, and some loan programs allow closing costs to be rolled in. Both are negotiable and neither is guaranteed, so planning on the full figure and treating any credit as an improvement is the safer sequence.

#Keeping the emergency fund separate

This is the discipline that most often gets abandoned in the last month, and it is the one most worth keeping.

The down payment fund and the emergency fund are different pots serving different risks. The moment you close, your fixed costs rise -- often substantially -- and your ability to move quickly falls. A homeowner who arrives at closing with $0 remaining has increased their obligations and eliminated their buffer in the same week.

Underwriters look at reserves for exactly this reason, and on some loan programs a required number of months of reserves is part of qualifying. But even where it is not required, the risk is real: the failure that follows a stretched purchase is usually not the mortgage payment itself, it is the $3,800 repair in month four.

A practical structure is three separate accounts: emergency fund, down payment and total-cash fund, and ordinary short-term sinking funds. Keeping them apart is the only way to know what you actually have.

#Where to hold the money: horizon decides

The single variable that determines where this money belongs is when you will spend it.

The reason equities are usually wrong for a short horizon is not that stocks are bad. It is that a house purchase is a fixed obligation with a date, and equities carry meaningful risk of being down over any given one- to three-year window. History includes multi-year stretches where a broad index was below where it started.

Worked example: You have $60,000 earmarked for a purchase 18 months out. In an insured deposit account at an assumed 4% APY, it grows to about $60,000 x 1.04^1.5, or roughly $63,630 -- a gain of about $3,630, with certainty about the balance. Invested in a stock fund, the expected return is higher, but a 25% decline is entirely possible within 18 months, leaving $45,000. The upside case might add a few thousand dollars to a purchase you would make anyway. The downside case removes the purchase. That asymmetry, not an opinion about markets, is the argument. The general principle behind it is set out in asset allocation.

For genuinely long horizons -- five or more years, with flexibility on the date -- the calculation changes and a diversified allocation becomes reasonable. The deciding question is whether you would be willing to delay the purchase by two or three years if markets fell. If the answer is no, the horizon is effectively short regardless of the calendar.

The calculator below runs the goal arithmetic for any target, starting balance, monthly deposit and assumed yield you enter.

#Savings timelines

The table below shows how long it takes to reach several targets at different monthly contributions, assuming a 4% APY with monthly compounding and no starting balance. Treat the yield as an assumption, not a forecast.

Two things stand out. Interest contributes very little over short horizons -- at $1,200 a month reaching $36,000, the deposits alone are $34,800 and interest supplies about $1,200. And the contribution rate dominates everything else. Doubling the monthly amount roughly halves the timeline; a percentage point of yield moves it by a month or two.

That is why most of the useful work in this project is on the contribution side: raising income, cutting fixed costs, or reducing the target by choosing a lower price point or a loan with a smaller down payment. The tactics in cutting monthly expenses apply directly, because every dollar freed goes straight into the timeline.

#When prices move while you save

This is the uncomfortable part of long timelines and it deserves plain arithmetic rather than reassurance.

If home prices rise 4% a year and your target is a 20% down payment on a $340,000 house -- $68,000 -- then after three years the same house costs about $382,500 and the 20% figure is $76,500. Your target has moved by $8,500, or roughly $236 a month across those 36 months, purely from price movement.

Prices do not only rise; regional declines happen and have happened. But planning should acknowledge that a moving target exists.

Three responses, each with a real cost:

1. Save faster. Add the drift to your monthly figure. In the example above, budget as though the target were $76,500 rather than $68,000.
2. Shorten the timeline by accepting a smaller down payment. Buying sooner at 10% down means PMI, which is a known monthly cost with a defined end. Sometimes cheaper than three more years of price drift plus rent.
3. Lower the price point. Recalculating what you can service monthly, rather than what you can borrow, is covered in how much house you can afford.

The relevant comparison is total cost of waiting -- rent paid plus price drift -- versus total cost of buying sooner -- PMI plus a higher balance plus, potentially, buying at a less favorable moment. That comparison depends on numbers only you have.

#Gift funds and seasoning

Family assistance is common and is permitted by most loan programs, but it must be documented properly or it can delay or derail an approval.

Gift letters. Lenders generally require a signed letter from the donor stating the amount, the date, the relationship, and explicitly that no repayment is expected. A gift that is secretly a loan is a problem, because an undisclosed obligation misstates your debt-to-income ratio.

Paper trail. Underwriters trace large deposits. A gift arriving as a check or wire that can be matched to the donor's account statement is straightforward. Cash deposited into your account is difficult or impossible to source and is best avoided entirely.

Seasoning. Funds already sitting in your account for a sustained period -- often described as two statement cycles -- are generally treated as your own and attract fewer questions. Money arriving days before closing gets scrutiny. Where a gift is planned, receiving it well before application removes the friction.

Program limits. Some loan types cap how much of the down payment may come from a gift, or require a minimum contribution from the borrower's own funds, particularly on multi-unit or second-home purchases. Rules vary by program.

Warning: Do not move money between accounts unnecessarily in the months before application. Every transfer creates a trail an underwriter must follow, and unexplained deposits are among the most common causes of last-minute conditions.

#What the usual advice gets wrong

"You need 20% down." You do not. Below 20% on a conventional loan you pay mortgage insurance, which is a cost with a defined cancellation path. Whether waiting to reach 20% is better than buying sooner with PMI depends on your rent, local price movement and how long the extra saving takes. Framing it as a requirement produces years of unnecessary renting for some households and none of the analysis.

Budgeting the down payment and nothing else. As the table showed, the total is commonly 1.5 to 2 times the down payment at lower percentages. Arriving with exactly the down payment means arriving short.

Draining the emergency fund at closing. Your fixed costs just rose and your flexibility just fell. That is the worst possible week to have no reserve.

Investing a two-year down payment in stocks. The upside case improves a purchase you would make anyway; the downside case cancels it. That asymmetry is the whole argument, and it does not depend on any market view.

Ignoring the ongoing costs. Property tax, homeowners insurance, HOA dues, maintenance and higher utilities all continue after closing. A payment that fits only if nothing ever breaks is not affordable, however the mortgage calculator presents it.

Opening new credit during the process. Financing furniture between application and closing changes your debt-to-income ratio and can affect approval. Large purchases generally wait until after the keys change hands.

Approached as one cash number rather than two, the project is tractable: define the total, set the horizon, put the money somewhere that cannot fall, and spend most of your effort on the contribution rate, because that is the variable that actually moves the date.