Tenant Billback Calculator

Shared expenses bill back to tenants by pro-rata share. This calculator allocates the billback.

Total expense pool

Building rentable SF

Tenant leased SF

Admin fee %

Tenant billback

$80,640

Base allocation

$72,000

Pro-rata share %

15.00%

How the math works

Billback = pool × tenant SF ÷ rentable SF × (1 + admin fee).

Keep expense pool audit-ready. Tenants often request support during lease negotiations, renewals, or audits — clean ledgers expedite the process and preserve trust.

How to Use

Enter total expense pool.
Enter building rentable SF.
Enter tenant leased SF.
Enter admin fee %.
Read tenant billback.

Frequently Asked Questions

Pro-rata method?

Most leases use leased SF ÷ rentable SF as tenant's share. Some use usable SF or weighted formulas. Read lease definitions carefully — differences can be 5-10% of billback.

Admin fee?

Typical 10-15% on CAM, 0-5% on tax and insurance. Covers property management overhead. Cap in some leases; uncapped in others.

Reconciliation?

Annual true-up at year-end. Estimates billed monthly; actuals reconciled once audit complete. Refunds issued for overpayment; catch-up billed for underpayment within 30-60 days of reconciliation.

What documentation matters here?

Written leases, move-in/move-out inspections with photographs, ledger entries showing every payment and charge, served notices with proof of service, and contemporaneous emails or texts. Courts weigh written evidence heavily; informal understandings rarely stand. Institutional operators run a monthly file audit to catch gaps before they matter. Good paper trails recover most of what's owed.