How Much Cash Do You Need to Keep in Reserve?

Build your reserve from four lines: property tax and insurance bills you pay yourself, estimated tax on your rental profit, repairs and replacements, and the costs you carry while a unit sits empty. If you plan to finance another rental, the lender sets a floor. On a Fannie Mae loan for an investment property, you must show 6 months of the new loan's full monthly payment in reserves after closing, plus 2% to 6% of the loan balances on your other financed properties.

What should a rental reserve cover?

Each line has its own source for the number. Add the first four lines per property. Eligible operating savings left after closing can also meet Fannie Mae's lender reserve requirement, so add only any shortfall after counting those savings and other eligible assets.

Do not count tenant security deposits. Under IRS Publication 527, a deposit you plan to return is not your income when you receive it, and you will owe it back at move-out.

Property tax and insurance bills outside escrow

When your mortgage has an escrow account, part of each monthly payment goes into that account and your servicer pays the property tax and insurance bills from it. If you own the rental free and clear, or your loan has no escrow, you pay those bills yourself. The Consumer Financial Protection Bureau warns that unpaid property taxes can bring penalties, a tax lien, and eventually foreclosure, and that a lender can buy force-placed insurance and bill you if your coverage lapses.

Divide each annual bill by 12 and move that amount into the reserve every month. A rental with a $4,800 property tax bill and a $1,800 insurance premium needs $550 a month ($6,600 / 12). If a bill is due sooner than 12 months out, divide the bill by the months left and save at the higher rate until you catch up.

Both bills are deductible on Schedule E in the year you pay them, so they lower your tax, but the cash has to be there on the due date.

How much estimated tax to set aside

No tax is withheld from rent. The IRS expects quarterly estimated payments if you expect to owe $1,000 or more when you file. For tax year 2026, the payments are due April 15, June 15, and September 15, 2026, and January 15, 2027, using Form 1040-ES.

You avoid the underpayment penalty if your withholding and estimated payments cover the smaller of:

• 90% of your 2026 tax, or
• 100% of the tax on your 2025 return, or 110% if your 2025 adjusted gross income was more than $150,000 ($75,000 if married filing separately).

If you also have a job, Publication 505 lets you cover the rental tax by entering an extra amount per paycheck in Step 4(c) of a new Form W-4, instead of making quarterly payments.

Tax is owed on rental profit, not on cash flow. Depreciation is subtracted from rent even though it costs no cash that year, so taxable profit is often lower than the cash you keep. Example: $30,000 of rent, minus $19,000 of deductible expenses and $8,000 of depreciation, leaves $3,000 of taxable profit. At a 22% federal rate, that is $660 of federal tax, or $165 a quarter, plus any state income tax. If the rental shows a loss, there is no tax on it to reserve for; see what to do when rental expenses exceed income.

How much to save for repairs and replacements

Plan the replacements first, because they are the large bills. Publication 527 treats a new roof, water heater, furnace, or central air system as an improvement. You pay the full cost in the year you replace it but depreciate it over 27.5 years as part of a residential building, so a $12,000 roof brings about $436 of deductions in a full year ($12,000 / 27.5). The reserve has to carry nearly the whole cost.

List each major component, its expected replacement cost from a quote, and the years it has left. Save the cost divided by the years left:

On top of that fund, keep a working balance for unplanned repairs, such as a burst pipe or a broken lock. Set it no lower than your policy's deductible, the amount you pay on a covered loss before insurance pays. Some smaller replacements can be deducted in the year you pay for them under IRS safe harbors; see which costs are capital expenses and which you can deduct now. For scheduling the work itself, see how to maintain and repair your rental.

How many vacancy months to plan for

For each month a unit is empty, you still pay the mortgage, property tax, insurance, any association dues, and the utilities the tenant normally covers. Publication 527 generally allows you to deduct mortgage interest and other ordinary and necessary rental expenses while the property is held out for rent. Mortgage principal remains a cash requirement but is not deductible, and you cannot deduct the rent you did not collect.

The Census Bureau reported a national rental vacancy rate of 7.3% for the second quarter of 2026. By region, it was 9.5% in the South, 6.9% in the Midwest, 5.9% in the Northeast, and 5.3% in the West. That rate is the share of rental units vacant and for rent at one time, not how long your unit will sit empty, so your own turnover history is the better guide. If your last two turnovers took 5 and 7 weeks, plan for 2 months of carrying costs.

How much cash do lenders require on a rental loan?

For loans approved through Desktop Underwriter, Fannie Mae's automated underwriting system, the Selling Guide sets these minimums, measured in months of PITIA, the full monthly payment of principal, interest, property taxes, insurance, and association dues:

If the loan is for an investment property or second home and you own other financed properties, you also need a percentage of the unpaid balances on those other loans, not counting the property being financed or your own home: 2% if you have 1 to 4 financed properties, 4% for 5 or 6, and 6% for 7 to 10. Money used for the down payment and closing costs does not count. Checking and savings balances, stocks, bonds, mutual funds, certificates of deposit, the vested balance of a retirement account, and the cash value of a life insurance policy do. For retirement funds, the lender must confirm that withdrawals are allowed regardless of current employment status; funds accessible only at retirement, employment termination, or death are excluded. Loans that a lender keeps instead of selling to Fannie Mae follow that lender's own rules, so ask for the reserve figure in writing before you apply.

Example: you are buying a rental with a $2,100 monthly payment, and you already own your home and one other rental with a $180,000 mortgage balance. That is 3 financed properties. You need $12,600 for the new loan (6 x $2,100) plus $3,600 for the other rental (2% x $180,000), or $16,200 in reserves after closing.

The lender reserve is a test at closing, not an operating budget. It can be met with eligible retirement money you would not want to spend on a furnace, so keep your operating reserve in a separate cash account that can also count toward the lender minimum.

A reserve plan for one rental

Using the figures above for a single-family rental with no escrow and a $1,900 monthly carrying cost (mortgage payment, tax, and insurance):

1. Tax and insurance: $550 a month, building to $6,600 before the bills come due.
2. Estimated tax: $165 a quarter for federal tax, plus state payments under your state's schedule.
3. Replacements: $300 a month into the replacement fund, plus a working balance equal to your insurance deductible.
4. Vacancy: a standing balance of $3,800 (2 months x $1,900).

Refill the vacancy and repair balances first after you draw on them, since those are the bills with no due date.

For which of these costs are deductible and how each is reported, see the full list of rental expenses you can deduct, and for the recurring bills themselves, see rental operating expense deductions.