The second rental is the first one over again, with one line added to the lender’s worksheet. The house costs what any house costs. What changed is that you owe money on something else now, and a lender counts that before it counts a dollar of rent in your favor.
What does a second rental cost up front?
Take the house from the first rental walk-through: $250,000, renting for $2,750 a month, bought with 20% down on a 30-year loan at an assumed 7%. The example puts property taxes at $3,000 a year and insurance at $1,400, so the payment, tax and insurance come to $1,697 a month.
Say you bought one like it five years ago on those same terms. Five years of payments have taken the balance to $188,263. Now you want a second one at the same price, renting for the same amount.
As of its Selling Guide published October 7, 2026, Fannie Mae asks for six months of the new house’s payment in reserves on an investment property, and then asks for more because of the first house: 2% of what is still owed on the other properties you finance, when you have one to four of them. That is the line the first purchase never had.
| Cash | |
|---|---|
| Down payment (20%) | $50,000 |
| Closing costs (3% of the price) | $7,500 |
| Reserves: six months of the new house’s $1,697 payment | $10,184 |
| Reserves: 2% of the $188,263 still owed on the first house | $3,765 |
| Cash you need | $71,449 |
These are example figures, not a quote.
The first two lines are money you hand over at the closing table. The last two stay in your own account, but they have to be sitting there when the file reaches underwriting, so save for them the same way. For the first-purchase version of this list, see how much money you need to buy a rental property.
Why does the first house raise the reserves?
Reserves are what a lender holds you to in case the rent stops. Fannie Mae measures them in months of the new loan’s payment, tax, insurance and association dues, and wants six months of that on an investment property. The extra share is measured differently: it comes off the unpaid balances of the other mortgages and lines of credit you carry, not off their payments.
That share is 2% while you have one to four financed properties, and it rises once you pass four. On the first house’s $188,263, 2% is $3,765.
Two numbers move the reserve line, and both are slow. Paying down the first loan shrinks the 2%. A smaller loan on the new house shrinks the six months. Neither happens between a Saturday showing and a Monday offer, which is why the reserve figure is worth working out before you shop and not after.
Does the first house’s rent help you qualify?
It can, and the form it arrives on decides how a lender counts it.
Once a rental has been through a full tax year it appears on Schedule E, the form that reports rental income and expenses on a personal return. Fannie Mae then has the lender work the cash flow from that form rather than from the lease, and subtract the house’s own payment, tax and insurance from the result. A house you bought two months ago has no Schedule E yet, so the lender takes 75% of the lease instead.
| What the lender counts | |
|---|---|
| It is on your Schedule E | The cash flow from that form, averaged over the months the house was in service or over twelve months, less its payment, tax and insurance |
| It is not on Schedule E yet | 75% of the lease, less its payment, tax and insurance: $2,063 less $1,697, which is $365 a month |
The 25% that comes off in the second case is not an estimate of your vacancy. It is the cut the rule applies, and it applies whether the house has been full for a year or not. The rental income post works through what that leaves on a lender’s worksheet.
One thing the Schedule E route does mean: the return you filed is now part of your loan file. If the house was in service for part of the year, or a big repair sits in the expenses, ask a tax professional how it reads before an underwriter asks you.
What if the cash is not there yet?
Four things move the $71,449, and each one costs something elsewhere.
- Put 15% down instead of 20%. That is the floor a conventional lender will reach on a one-unit rental, because Freddie Mac caps the loan at 85% of the price, as of October 2026. The down payment drops to $37,500, and mortgage insurance joins the monthly bill.
- Buy a cheaper house. Every line above except the 2% scales with the price, so a $200,000 house with the same rent-to-price ratio takes roughly a fifth less.
- Pay the first loan down. Each $50,000 knocked off that balance takes $1,000 off the reserve requirement. It is the slowest lever and the only one that also lifts the first house’s cash flow.
- Wait for the rent. The first house threw off about $420 a month on these figures. Two years of that, untouched, is most of the reserve lines.
How does a second house change the month?
On the example’s numbers the second house pays what the first one does: $420 a month, which is 8.8% a year on the $57,500 that actually left your hands. Two houses is about $840 a month, with two sets of reserves parked behind them.
What changes more than the total is the shape of the risk. When one house out of one sits empty, all of your rent stops and the whole payment is yours. When one out of two sits empty, the other half of the rent keeps arriving and keeps paying its own bills. That is not a reason to buy, but it is the reason the second purchase feels different from the first even when the numbers look identical.
How do you check the second house before you offer?
Run it the way you ran the first one, then run the pair. Put the new house in the rental calculator with a current tax rate and a real insurance quote, not the seller’s old bill. Then add up both houses’ payments, both tax bills and both reserve lines and ask whether a bad quarter on either one still leaves the other covered.
The number to pin down first is the reserve total, because it is the one a lender checks and the one you cannot borrow. For the line-by-line of what the rent has to cover each month, see how rental property cash flow works.