Make the result useful
Treat parking as a small rent roll, not automatic upside
Parking revenue can improve effective income, but only occupied, chargeable spaces produce it. Model it as its own line with an occupancy assumption and track it separately from apartment rent. That keeps a vacant garage, included parking, or seasonal demand from silently inflating the main rent number.
Confirm that the spaces can actually be rented under ownership documents, leases, zoning, association rules, and any tax requirements. A high theoretical occupancy percentage is not a forecast; it is a scenario that should be compared with historical use and turnover.
The assumptions that move this result
Monthly space rate
Charge for one occupied, eligible space in the stated period.
Eligible spaces
Spaces available to rent after any included, reserved, or restricted spaces are removed.
Occupancy assumption
Expected occupied share expressed as a percentage, not a guarantee.
Lease basis
Whether the charge is month-to-month, bundled, or separately contracted.
gross monthly parking income = space rate × eligible spaces × occupied-space percentage
The result is gross modeled parking income before collection loss, taxes, operating costs, or enforcement expense.
Read the number in context
Bundled-parking comparison
If four spaces are included in leases, do not count all eight as chargeable. A $75 rate on four remaining spaces at 75% occupancy is $225, not $450.
Seasonal-demand scenario
A 100% summer occupancy case may be useful, but carry a lower off-season scenario before relying on annual income.
It does not determine space ownership, permitted use, pricing, collection, enforcement, tax treatment, or availability.
Before you act
• Count only spaces the property may charge for.
• Keep parking income separate from unit rent.
• Reconcile assumed occupancy to signed agreements and collected payments.
Occupied-space scenario
Eight eligible spaces at $75 per month and 75% occupancy produce $450 monthly gross parking income. At full occupancy the same inventory would produce $600, so the occupancy assumption accounts for a $150 monthly difference.
Should included parking be income?
Not as a separate charge unless the rent roll actually separates it. Record the lease treatment consistently.
Can I assume 100% occupancy?
You can model it, but label it as a best-case scenario and compare it with actual history.
Does the result include enforcement costs?
No. Add permits, access control, maintenance, or enforcement separately if relevant.