What Is Occupancy Expense? Lease Types, Ratios, and Deductions

An occupancy expense is the total cost of using a physical space, whether you own it or lease it. For a business, occupancy expenses cover rent or mortgage payments, property taxes, insurance, utilities, common area charges, and building maintenance. For a homeowner, the same idea captures the mortgage, taxes, insurance, and the ongoing costs of keeping the property functional. These costs typically land among the largest line items on any budget, which is why they get their own category in accounting and tax reporting.

The simplest test for whether something belongs in this category: would the cost disappear if you didn’t have the space? If yes, it’s an occupancy expense.

What Counts as an Occupancy Expense

The major components fall into predictable groups.

Rent or mortgage payments. The base cost of accessing the space. For tenants, this is the contractual lease payment. For owners, it includes mortgage principal and interest.
Property taxes. Effective rates on owner-occupied property vary widely. State averages range from under 0.3% of market value to over 2.2%, with certain counties pushing above 2.9%.¹
Property insurance. Coverage against fire, weather damage, and liability claims. The national residential average now exceeds $2,500 per year, though actual premiums swing dramatically depending on location and coverage level. Commercial premiums typically run higher.
Utilities. Electricity, water, gas, and heating. These are variable costs that shift with the season and local rates. Commercial electricity alone runs roughly 8 to 37 cents per kilowatt-hour depending on the state.
Common area maintenance (CAM). In commercial leases, landlords pass through the cost of maintaining shared spaces like lobbies, parking lots, and elevators. These charges typically run several dollars per square foot annually.
Depreciation. If a business owns the building, the cost of the structure is spread across its useful life. The IRS assigns nonresidential real property a 39-year recovery period under the modified accelerated cost recovery system. That annual charge is an occupancy expense even though no cash changes hands.²

One cost that catches people off guard is leasehold improvements. When a tenant builds out office space or renovates a retail storefront, the cost gets capitalized and amortized over the shorter of the lease term or the improvement’s useful life. The Federal Reserve’s accounting manual classifies this amortization as an occupancy cost, and most businesses follow the same treatment.³ A tenant improvement allowance from the landlord offsets the cost on the balance sheet, but it doesn’t erase the expense.

How Commercial Lease Type Shifts What You Pay

The type of commercial lease you sign determines which occupancy expenses show up on your books versus the landlord’s. Two spaces with identical base rent can produce very different total costs.

Triple net (NNN) lease. You pay base rent plus property taxes, insurance, and CAM charges separately. The base rent looks low, but your total cost fluctuates as pass-through expenses change year to year. Standard for industrial and single-tenant retail.
Full-service gross lease. You pay one flat amount that bundles rent and most operating expenses. The landlord absorbs the variability, which makes budgeting simpler but usually means a higher base rent.
Modified gross lease. A middle ground. A typical arrangement has the tenant covering utilities and janitorial services while the landlord handles structural maintenance, taxes, and insurance. The split is negotiable.

Comparing spaces across different lease structures requires converting everything to a total occupancy cost per square foot. A gross lease at $30 per square foot might actually be cheaper than a NNN lease at $18 per square foot once you add $8 in pass-through expenses and $6 in utility costs.

Calculating the Total and the Occupancy Cost Ratio

Start with a twelve-month window. A full year captures seasonal swings in utility bills, annual tax assessments, and insurance renewals that shorter periods miss. Pull every property-related payment for that period: lease payments, tax bills, insurance premiums, utility invoices, CAM charges, and maintenance costs. If you own the building, add annual depreciation and mortgage interest.

A few line items people routinely forget:

Amortized leasehold improvements. If you spent $150,000 building out a space on a ten-year lease, $15,000 per year belongs in the calculation.
Escalation charges. Most commercial leases include annual rent increases, commonly around 3% per year or tied to the Consumer Price Index. The base rent you signed at is not the rent you’ll pay in year five.
Percentage rent. Retail leases sometimes require additional rent once sales exceed a breakpoint. A lease with $60,000 base rent and a 6% overage clause charges extra rent on every dollar of sales above $1,000,000.

Once you have the total, the occupancy cost ratio measures how much of your revenue goes toward keeping the doors open:

Occupancy Cost Ratio = Total Occupancy Costs ÷ Gross Sales × 100

A store generating $800,000 in annual revenue with $72,000 in total occupancy costs has a ratio of 9%. What counts as healthy depends on the business. A grocery store operating on thin margins might target 2% to 3%, while an apparel retailer with higher markups can sustain 12% to 15% and still operate profitably. Restaurants and personal service businesses typically fall in between. The ratio is most useful when comparing locations within the same business rather than across industries.

A ratio that creeps upward over time signals rent is growing faster than sales, which eventually squeezes every other budget category. Lenders and financial analysts watch this metric closely, and it’s often the deciding factor when a retailer weighs whether to renew a lease or relocate.

Tax Deductions for Occupancy Expenses

Most occupancy expenses are deductible for businesses. Federal tax law allows a deduction for rent and other payments required to continue using property for business purposes, as long as the expense is ordinary and necessary for the trade.⁴ That covers lease payments, property taxes, insurance premiums, utilities, and maintenance costs incurred at a business location. For building owners, depreciation provides a non-cash deduction spread over the 39-year recovery period.²

Home Office Deductions

If you use part of your home regularly and exclusively for business, you can deduct a proportional share of your occupancy expenses. The IRS treats mortgage interest, property taxes, insurance, utilities, and general repairs as indirect expenses, deductible based on the percentage of your home used for business.⁵ You calculate that percentage by comparing the square footage of your office to the total area of the home.

There’s also a simplified method that skips the recordkeeping. You deduct $5 per square foot of your home office, up to a maximum of 300 square feet, which caps the simplified deduction at $1,500 per year.⁶ If your actual expenses are high relative to your office size, the standard method almost always produces a larger deduction. If your office is small and your recordkeeping is inconsistent, the simplified method at least gets you something.

Two limits apply to the simplified method. You cannot deduct any depreciation on the home office portion during years you use it, and you cannot carry forward unused deductions from prior years when you used the actual expense method.⁵ The election is annual, so you can switch between methods from year to year.

1
Tax Foundation. Property Taxes by State and County, 2025
2
Internal Revenue Service. Publication 946 (2024), How To Depreciate Property
3
Federal Reserve. Financial Accounting Manual for Federal Reserve Banks
4
Office of the Law Revision Counsel. 26 U.S. Code 162 – Trade or Business Expenses
5
Internal Revenue Service. Publication 587 (2025), Business Use of Your Home
6
Internal Revenue Service. Simplified Option for Home Office Deduction