Finance category
Mortgage, loan, investing, tax, and money calculators.
Interest Shortfall Calculator
NOI may fall short of interest due. This calculator sizes the shortfall and runway.
Monthly shortfall
$45,000
Total shortfall
$405,000
Reserve coverage months
8.4
How the math works
Shortfall = interest − NOI per month. Coverage = reserves ÷ shortfall.
Reserve coverage under 6 months = urgent action. Engage lender, cut controllable opex, extend rate lock, or raise bridge capital now — options narrow rapidly.
How to Use
- Enter monthly NOI.
- Enter monthly interest expense.
- Enter cash reserves.
- Enter shortfall duration estimate.
- Read shortfall total.
Frequently Asked Questions
Shortfall triggers?
Rate reset above NOI support. Major tenant loss. Expense spike. Seasonal trough. Transition capex reducing NOI during construction.
Coverage options?
Reserves. PIK interest (add to principal). Sponsor contribution. Mezzanine bridge. Lender forbearance. Each has pricing and covenant implications; evaluate before default.
Communication?
Engage lender 30+ days before expected shortfall. Surprise shortfalls trigger default provisions; forecasted shortfalls often get forbearance or restructured. Relationship matters.
How often should I rerun this?
Rerun this calculator whenever inputs change materially — new rent roll data, rate moves, loan balance updates, or quarterly operating data. For active deals, monthly refresh is typical. For stabilized assets under monitoring, quarterly is fine. Treat the output as a decision tool, not a one-time answer — market conditions evolve and so should your analysis.
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