Reserves and months of runway

A stressed deal needs reserves that fund its cumulative cash shortfall through the date operations recover, with the cash needed to achieve that recovery left untouched. Months of runway equal spendable cash divided by monthly net cash burn, and that quotient holds only when the burn is constant and the cash is free to cover it. The number that matters is therefore a property of the business plan and the stressed receipts, and a stated count of months of debt service answers a narrower question. Guarantor support and the cash needed at maturity belong in separate tests.

Runway ends on the first payment date that cash cannot cover

Runway is a timing calculation. The endpoint is the first payment date on which spendable cash falls short of the required outflow, and a positive balance at the end of a projection can hide an earlier gap if an obligation falls due before the receipts meant to fund it.

The mechanics run period by period. Opening spendable cash plus receipts minus operating payments, debt service and any capital payment due gives closing cash, and closing cash becomes the next opening balance. A single division of reserves by an average burn is only a shortcut for the case where every month looks alike.

Stress cases tend to understate the deficit when they cut receipts and trim expenses by the same proportion. Debt service and property taxes continue when income falls or a building is not yet fully occupied, and variable-rate debt can raise the monthly requirement when rates rise. Holding those fixed costs in place while receipts fall is the correct direction of the test.

The recovery endpoint needs a cash definition too. Sustaining occupancy means rent-paying tenants under signed leases generate enough income to cover monthly operating expenses and debt service, including subordinate debt that requires current payment. A signed lease that has not yet produced rent has not reached that endpoint.

Cash earmarked for tenant improvements is not operating runway

A reserve counts only toward the obligation it was sized to meet. A statement can show a large cash balance while the share free to absorb operating deficits is small, so each reserve needs a stated purpose and a payment schedule.

Office leasing shows the trap. Tenant-improvement cash spent on debt service shrinks the immediate shortfall, but the space still has to be delivered to tenants, and the building may then need added sponsor equity to finish leasing.

Moving cash between reserve buckets creates no liquidity. The operating balance rises by exactly what the improvement balance falls. Projecting the higher operating balance while also assuming the original leasing budget is fully funded counts the same dollars twice.

A funded debt-service reserve answers a narrower question than total runway. Its stated months describe coverage of debt service on its own basis, and agency lenders have required funded debt-service reserves of six to 18 months. Property income that covers part of debt service stretches such a reserve beyond its gross multiple. Operating deficits and capital spending draw on other cash.

Bridge lenders have responded to stress by cutting borrowing and calling for more sponsor equity, preferred equity or mezzanine financing. That is a larger cash requirement at closing, and it sits outside any reserve count.

How the business plan changes the reserve target

The business plan decides which cash needs must survive the stress. In lease-up, reserves bridge the deficit and also protect the spending that produces rent-paying tenants. In a renovation, the funding period runs until the work restores operating cash flow, and a delay in the work extends the period without adding cash.

Practitioners who work with banks say lenders expect a credible lease-up plan alongside reserves, operating costs and interest reserves sufficient to cover debt service. The pairing matters because a bridge that is large enough on paper can still leave the leasing plan unfunded.

A hotel under renovation shows the timing risk. Guarantor support can cover the debt-service shortfall in the near term and still expire before lost operating cash flow returns, when the renovation runs longer than planned. The relevant duration is the time to operating recovery.

A seasoned property has a different bridge. In one apartment case, rent delinquencies pulled the debt-service coverage ratio down to 0.80x. Combined borrower and guarantor liquidity could cover the shortfall until maturity, including reasonable capital expenditures, because the building had been recently renovated. Coverage of the operating deficit alone would have left those capital needs unreconciled.

The same arithmetic therefore produces different required months by property type. An operating building with a collection problem and an unleased building need different cash, even at identical debt service.

Worked example: a hypothetical office lease-up with protected improvement cash

Consider a hypothetical office lease-up and compare a base case and a stressed case over the same 12 months. Both start with $900,000 of funded cash, of which $300,000 is dedicated to tenant improvements payable inside the period. Cash available to fund deficits is $900,000 minus $300,000, or $600,000.

Recurring payments are the same in both cases. Operating cash payments, including all fees, are $60,000 a month and debt service is $100,000 a month, so recurring payments total $160,000 a month. No other fees or equity contributions enter either case.

Base case. Monthly receipts are $140,000, so monthly burn is $160,000 minus $140,000, or $20,000. Over 12 months the recurring deficit is $20,000 multiplied by 12, or $240,000. Adding the $300,000 improvement payment gives total reserve use of $540,000, and ending funded cash is $900,000 minus $540,000, or $360,000.

Stressed case. Monthly receipts fall to $110,000, so monthly burn is $160,000 minus $110,000, or $50,000. Over the same 12 months the recurring deficit is $50,000 multiplied by 12, or $600,000. With the same $300,000 improvement payment, total reserve use is $900,000 and ending funded cash is $900,000 minus $900,000, or $0.

Constant-burn runway uses the $600,000 free for deficits. In the base case it is $600,000 divided by $20,000, or 30 months. In the stressed case it is $600,000 divided by $50,000, or 12 months. The 30 months assumes the base burn never changes, while the explicit schedule only proves 12 months in either case.

The same $600,000 equals six months of gross debt service, since $600,000 divided by $100,000 is six. It funds 12 stressed months because receipts cover part of the payments. Dividing the full $900,000 by the stressed burn of $50,000 gives 18 months, and that figure uses improvement cash that is already committed.

The stressed case ends the period with nothing left and a continuing monthly deficit of $50,000. Under these payment assumptions, receipts must reach $160,000 a month to cover recurring payments. Each further six months of recovery would call for $50,000 multiplied by 6, or $300,000, of new funding that the starting reserve does not contain.

Guarantor liquidity and loan maturity need their own funding tests

Guarantor liquidity can extend runway, though its length depends on the shortfall it absorbs. Property reserves and guarantor support belong on separate schedules so the same dollars are never shown as already funded and also as a future contribution.

A liquidity covenant measures something other than a reserve. One multifamily agency program sets guarantor liquidity at the greater of 10% of the loan amount or 100% of annual debt service. That fixes a required balance. Converting it to months of support needs a second calculation using the stressed deficit of the property.

Duration is the weak point. Support can cover the near-term shortfall and still run out sooner than the lender anticipated if leasing fails to materialize as projected. Every month of delayed recovery adds to the cumulative draw while the property replaces none of the missing income.

Trouble often arises in two places: a property that cannot pay debt service during the hold, and a property that cannot be refinanced when a short debt term ends. The two failure points differ, so the operating bridge and the maturity test sit in separate schedules.

Maturity adds its own cash need. Funding deficits until the loan comes due leaves repayment or refinancing of the outstanding balance unresolved. A falling valuation can add another claim: clients have kept money aside because a bank valuation can show a loan to value covenant breach and call for a paydown.

Common analysis mistakes in months-of-reserves figures

A months figure can sit on the wrong denominator. Dividing by gross debt service measures debt-service equivalents, while dividing by net monthly burn measures constant-burn runway. In the worked example the same $600,000 reads as six months on one basis and 12 stressed months on the other, with no change in liquidity.

Improvement cash can be counted twice. The opening reserve includes it, the deficit calculation consumes it, and the leasing plan still assumes the work is fully funded. A correct reconciliation charges the improvement payment once and leaves the remainder for deficits, which is why 18 months overstates the stressed case against 12.

Reserve draws can be stopped at signed occupancy. Sustaining occupancy requires rent-paying tenants whose income covers operating expenses and current-pay debt service, so a lease that is signed but not yet paying leaves the deficit open.

Guarantor balances can be merged into property cash. That shows support as contributed when it is only available, and it hides how fast the balance declines with each draw. A sound schedule shows each contribution and the guarantor liquidity remaining afterward, which can be compared with the recovery period.

Reserves can be declared sufficient because they last until maturity. That settles carrying costs through a date and leaves repayment or refinancing open. A complete reconciliation shows the operating bridge and the maturity requirement side by side.

Checklist questions for a reserve and runway review

Which reserve balances are free for operating deficits? Cash assigned to improvements or other obligations comes out before the remaining deficit-funding balance is known.

What denominator produces the stated months of coverage? Gross debt service and net monthly burn describe different forms of coverage.

When does each payment fall due? A period-by-period schedule shows whether any obligation arrives ahead of the receipts meant to fund it.

How much cash remains for tenant improvements? The leasing budget has to be funded for the operating recovery to occur.

Which receipts establish sustaining occupancy? Rent-paying tenants must cover operating expenses and debt service, including subordinate debt requiring current payment.

How does a delayed recovery change the guarantor draw schedule? Longer leasing or renovation periods can exhaust support before operating cash flow returns.

Which capital expenditures remain payable inside the reserve period? A debt-service bridge can coexist with additional cash needs.

What does maturity require beyond the bridge? Repayment or refinancing capacity is a separate funding test from carrying the property to the loan end.

What cash would a valuation call require? A covenant breach from a lower appraisal can demand money unrelated to monthly operations.