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Lease-Up Burn Rate Calculator
Lease-up periods burn cash monthly. This calculator tracks burn rate against reserves.
Monthly burn
$90,000
Runway months
1 yr 8 mo
Total monthly out
$130,000
How the math works
Burn = debt service + opex − leased rent. Runway = reserve ÷ burn.
Update burn monthly. If runway < 12 months, act immediately: capital call, bridge debt, or faster absorption push. Running into default mode is devastating to equity value.
How to Use
- Enter monthly debt service.
- Enter monthly opex.
- Enter rent from leased units.
- Enter interest reserve.
- Read burn rate and runway.
Frequently Asked Questions
Typical burn?
100-200k/month for a 150-unit lease-up. Scales with debt service and expense base. Early months: nearly full burn. Late months: near break-even.
Reserve?
Lender typically requires 12-18 months of debt service reserve. Underwrite for 24+ months if possible. Running out of reserve triggers cash trap or default.
Forecasting?
Project burn monthly using leasing velocity × economic rent. Adjust every 30 days based on actual. Overestimate velocity = run out of cash. Plan for 20% slower than proforma.
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.
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