How Much Cash Reserve a Rental Property Needs

The number that decides whether a bad year is an inconvenience or the end of your position.

$23,000

A realistic first-year reserve for one $240,000 rental. Most people hold less.

Three layers, not one number

“Six months of expenses” is the usual advice and it is incomplete, because it covers only one of the three things that actually go wrong. A reserve should be built from what it is meant to absorb:

Reserve for one $240,000 rental

Six months of PITI ($1,534 × 6): $9,204
The next major capital item — HVAC: $9,000
One turnover: $5,025

$23,229 — call it $23,000.

Layer	What it absorbs	How to size it
Carrying reserve	A vacancy, an eviction, a tenant who stops paying while you regain possession.	Six months of principal, interest, taxes and insurance. Longer where eviction is slow.
Capital reserve	The component nearest the end of its life.	The replacement cost of the single largest near-term item — usually roof or HVAC.
Turnover reserve	Make-ready, leasing fee and the empty month.	One full turnover. See what turnover actually costs.

The uncomfortable arithmetic

$23,000 against the $67,200 of cash you invested is 35%. Hold it and fund it at closing, and cash invested becomes $90,200 — which takes cash-on-cash return from 1.48% to 1.10%. That is the honest cost of being properly capitalised, and it is why advertised returns on thin deals quietly assume you are not.

Reserve versus CapEx reserve

These are different and both are needed, which is a common source of confusion.

	CapEx reserve (an expense line)	Cash reserve (a balance)
What it is	A monthly accrual against future capital costs	A pot of money that exists today
Where it appears	In your operating expenses, reducing NOI	On your balance sheet, not in the pro forma
What it answers	“Is this property really profitable?”	“Can I survive the next twelve months?”
Timing	Builds slowly from month one	Must exist before you close

The CapEx line keeps your NOI honest. The cash reserve keeps you solvent while the CapEx line is still accruing. On day one you have zero accrued and a full set of aging components, which is exactly why the cash reserve is largest in year one and can taper later.

What lenders require, and why it is not enough

Loan type	Reserve requirement	Note
Conventional investment	2 – 6 months PITI	Verified at closing; more if you own several financed properties.
DSCR loan	3 – 6 months PITI	Sometimes more where coverage is thin.
Commercial (5+ units)	Varies; often escrowed	Lenders may hold and release replacement reserves themselves.

Note what the lender’s figure covers: their payment, for a few months. It contains nothing for a roof and nothing for a turnover. Meeting the requirement is a closing condition, not a risk plan.

How it scales across a portfolio

Reserves do not scale linearly, because not every property has a vacancy at once. Five properties do not need five times the reserve of one. But the discount is smaller than diversification arguments suggest, because the risks that matter most are correlated: a hail storm hits a neighbourhood, an insurance market reprices a whole state, a recession raises vacancy everywhere at the same time.

Portfolio	Reasonable pooled reserve	Reasoning
1 property	Full $23,000	No pooling possible. Everything is concentrated.
3 properties	~$45,000	Roughly two full reserves. Unlikely all three turn over together.
10 properties	~$100,000	Carrying reserve can thin; capital reserve cannot, because components age on schedule.

Directional. Correlated risks — weather, insurance markets, local employment — are the reason the pooling discount is limited.

Where to keep it

Somewhere boring, liquid and separate. A dedicated high-yield savings account is the standard answer, because the reserve’s job is to be available on the day the furnace fails, not to earn a return. A HELOC or portfolio line of credit is a reasonable second layer behind cash — undrawn it costs nothing — but it is not a substitute: lines get reduced or frozen in exactly the conditions that create the emergency.

Fund it before you buy, not after

The most dangerous window is the first year, when you know least about the property and have accrued nothing. If buying the property leaves you without the reserve, the honest reading is that you cannot yet afford this deal at this price — which is different from, and much more useful than, discovering it in month seven. Run the numbers with reserves included in cash invested in the calculator and see whether the return still clears your bar.

Frequently asked questions

How much cash reserve should I have for a rental property?

Build it in three layers: six months of principal, interest, taxes and insurance; the replacement cost of the nearest major capital item; and one full turnover. On an ordinary $240,000 rental that comes to roughly $23,000 in the first year.

Is a lender's reserve requirement enough?

No. Lenders typically require two to six months of payments, which covers a vacancy but contains nothing for a roof, an HVAC system or the cost of turning the unit over. Treat it as a closing condition rather than a risk plan.

Do reserves count as cash invested?

If you fund them at closing as part of acquiring the property, yes — and including them lowers your cash-on-cash return, which is the honest picture. On the example, adding a $23,000 reserve takes the return from 1.48% to 1.10%.

Can I use a HELOC instead of cash reserves?

As a second layer behind cash, reasonably — an undrawn line costs nothing and adds capacity. It is a poor substitute for cash, because credit lines can be reduced or frozen precisely during the broad market stress that creates the emergency in the first place.