Rental Maintenance Reserve Calculator

Estimates how much a landlord should set aside each month per rental unit for repairs and maintenance, and how many months it takes to build a target reserve from the current balance.

Your estimate

Monthly set-aside per unit...

Monthly set-aside for all units...

Gap to your target reserve...

Months to reach the target...

Estimates only. Assumptions are listed below, and you can change every input.

A furnace fails in January, a water heater leaks in July, and the tenant in unit 3 reports a roof drip the same week. Repairs never arrive on a schedule, and landlords who fund them out of the current month's rent end up choosing between a slow fix and a credit card. A maintenance reserve turns those surprises into a line item: a fixed share of rent moved into a separate account every month, ready before the request comes in.

This calculator takes your unit count, average rent and the percentage of rent you want to reserve, then works out the monthly set-aside per unit and for the whole portfolio. If you also enter your current reserve balance and the cushion you want per unit, it shows the shortfall and how many months of contributions it takes to close it. The default percentage is a starting point rather than a benchmark: an older building with original plumbing needs a higher share than a recent build, and your own repair history is the best guide.

How to use this tool

Enter the number of units and the average monthly rent you collect per unit.
Choose the percentage of rent you want to set aside, ideally based on your own repair spending over the past few years.
Add your current reserve balance and the cushion you want per unit to see the shortfall and how many months of contributions it takes to close it.

What the math assumes

The reserve is a flat percentage of rent every month; it does not change with property age, season or the age of major systems unless you change the percentage yourself.
All units share the same average rent; if your rents vary a lot, run the calculator once per building.
The 10% default is only a placeholder to start from, not an industry figure. Replace it with a share based on what you actually spent on repairs over the last two or three years.
Months to target assumes you make the full contribution every month and take nothing out for repairs in the meantime.
The reserve earns no interest in this estimate, and months are rounded up to the next whole month.

Frequently asked questions

Should the reserve percentage be higher for an older property?

Usually yes. Older roofs, water heaters, furnaces and plumbing fail more often and cost more to replace. Add up what you actually spent on repairs over the last two or three years, divide by the rent collected in that period, and use that as your percentage rather than a generic rule.

Why does months to target show 0 when I still have a shortfall?

The months figure only makes sense when you are contributing something. If the monthly set-aside is 0, because rent, units or the percentage is 0, the calculator returns 0 instead of an impossible number.

Is a maintenance reserve the same as a capital expenditure reserve?

Not quite. A maintenance reserve covers repairs and routine upkeep. A capital reserve covers big replacements such as a roof or a boiler. Many small landlords keep both in one account; if you do, use a higher percentage so the single fund covers both.

Where should the reserve money sit?

A separate savings account works for most small landlords. Keeping it apart from operating cash makes it harder to spend by accident and easier to see whether contributions are actually happening.

Link to this toolhttps://rentfixr.com/tools/rental-maintenance-reserve/

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More free tools from RentFixr

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DIY vs Vendor Repair Cost Calculator: Compares the true cost of a landlord doing a repair themselves, including their time and the chance of a redo, against a vendor's quote, so the call is based on numbers rather than habit.

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