Bank Balance Is Not Runway

You check your bank account. $680,000. You divide by your monthly burn rate of $55,000. "Great, 12.4 months of runway." You close the tab, feeling comfortable. But that number is wrong. Not because the math is wrong, but because the inputs are incomplete. And the gap between your calculated runway and your real runway could be the difference between a comfortable position and an emergency.

The Problem with Naive Runway Math

Cash divided by burn equals months. It is the formula every founder uses, every investor asks about, and every financial template defaults to. The formula itself is correct. The problem is the first variable: cash.

When founders say "cash," they mean their bank balance. But your bank balance is not your available operating cash. Your bank balance includes money that belongs to other people, money that is already committed to specific obligations, and money that you cannot actually spend on operations. Treating all of it as runway fuel overstates your position, sometimes dramatically.

This is not a theoretical problem. Startups have shut down with money still in the bank because they did not account for obligations that consumed their remaining cash. The bank balance said they had runway. The obligations said otherwise.

What Actually Reduces Available Cash

Four categories of obligations sit between your bank balance and your true operating cash.

Tax Obligations

GST or sales tax collected from customers but not yet remitted. Advance tax payments due within the next quarter. Payroll tax withholdings. TDS or withholding tax on contractor payments. These are not your money. They are liabilities sitting temporarily in your account, and they will leave on a schedule you cannot control.

For a company with $50K in monthly revenue, quarterly tax obligations can easily reach $50K to $80K. That is a full month of burn that disappears on a specific date.

Deferred Revenue

If you collect annual subscriptions or upfront payments for work not yet delivered, that money is in your bank but it is not yours to spend freely. You owe a service in exchange. If customers cancel and request refunds, or if you fail to deliver, that money goes back. Accounting standards require you to recognize it as a liability until the service is delivered.

A SaaS company with $20K MRR that sells annual plans might have $120K to $150K in deferred revenue at any given time. That is two to three months of "runway" that is actually committed to service delivery.

Committed Payroll

Your standard monthly burn includes payroll, but committed payroll obligations often exceed a single month. Severance obligations for any employee you might need to let go. Accrued vacation payouts. Bonus commitments. Notice period pay. If you have 15 employees and each has 2 weeks of accrued vacation, that is roughly $75K in obligations beyond your standard monthly payroll.

Vendor Commitments

Annual contracts with remaining obligations. Infrastructure agreements with minimum spend commitments. Lease obligations for office space. Marketing commitments for campaigns already contracted. You signed these contracts, and the money is owed regardless of whether you continue operating.

The True Cash Position Concept

True Cash Position is the amount of money in your bank that is actually available for ongoing operations after all obligations are satisfied. The formula:

True Cash = Bank Balance - Tax Obligations - Deferred Revenue - Committed Payroll - Vendor Commitments

And from True Cash, you get True Runway:

True Runway = True Cash / Net Monthly Burn

Let us walk through a real example.

A seed-stage SaaS company has:

• Bank balance: $680,000
• Quarterly tax obligations: $74,000
• Deferred revenue (annual plans): $122,000
• Committed payroll beyond standard burn: $98,000
• Remaining vendor commitments: $0 (all month-to-month)
• Monthly net burn: $55,000

Naive runway: $680,000 / $55,000 = 12.4 months

True Cash: $680,000 - $74,000 - $122,000 - $98,000 = $386,000

True Runway: $386,000 / $55,000 = 7.0 months

The company went from "comfortable" to "start preparing for fundraise." Same bank account. Same burn rate. Different conclusion because the inputs are complete.

Why 5.4 Months Matters

The gap between 12.4 months and 7.0 months of runway is 5.4 months. That is not a rounding error. That is the difference between fundamentally different strategic positions.

At 12.4 months of runway, founders typically feel comfortable. They are hiring, investing in product, and planning to fundraise "sometime next year." There is no urgency.

At 7.0 months of runway, the calculus changes completely. Seven months means you need to start fundraising now if you want to close before runway becomes critical. Fundraising typically takes 3 to 6 months. If you wait until you "feel" like it is time, based on your bank balance runway, you start the fundraise at 9 months but actually have only 3.6 months of true runway remaining. That is a crisis, not a fundraise.

Decisions made on bank balance runway versus true cash runway can be fundamentally different:

• Hiring: At 12 months, you might approve two new hires. At 7 months, you approve zero and consider whether your current team is sustainable.
• Fundraising: At 12 months, you plan to start next quarter. At 7 months, you start today.
• Spending: At 12 months, you invest in that marketing campaign. At 7 months, you cut discretionary spending.
• Board communication: At 12 months, the update is optimistic. At 7 months, the conversation is about survival.

How to Calculate Your True Cash Position

You can calculate your True Cash Position in 30 minutes. Here is the process:

Step 1: Start with your bank balance. Use the actual number from your bank account, not your accounting software. If you have multiple accounts, sum them.

Step 2: List tax obligations due in the next 90 days. GST/sales tax, advance tax, payroll tax, TDS/withholding. Check your tax calendar and your accountant's estimates. Be conservative. If you are unsure, overestimate.

Step 3: Calculate deferred revenue. Sum all payments received for services not yet delivered. For annual subscriptions, this is the remaining months of service times the monthly value. For project-based work, this is the undelivered portion of the contract value.

Step 4: Estimate committed payroll obligations. Accrued vacation for all employees. Notice period obligations (what you would owe if you needed to downsize). Any bonus commitments. Severance provisions if applicable.

Step 5: Sum remaining vendor commitments. Annual contracts with remaining term. Minimum spend agreements. Lease obligations. Any other contractual financial commitments.

Step 6: Subtract all obligations from bank balance. The result is your True Cash Position.

Step 7: Divide by net monthly burn. The result is your True Runway. Compare it to your bank balance runway. If the gap is more than 2 months, your decisions may need to change.

Making True Cash Position Operational

Calculating True Cash once is useful. Making it part of your monthly financial routine is transformative. When you track True Cash over time, you see trends that bank balance alone cannot reveal.

Your bank balance might be increasing while your True Cash is decreasing, because deferred revenue is growing faster than cash. Your bank balance might be stable while your True Cash is improving, because you are reducing obligations. These trends drive different decisions than bank balance alone would suggest.

RunwayCal's Mission Control computes True Cash Position automatically from your financial inputs. Tax obligations, deferred revenue, committed payroll, and vendor commitments are all structured inputs that flow into the calculation. Your runway is always based on True Cash, not bank balance.

If you prefer to start with a manual calculation, try the True Runway Calculator. It includes obligation categories and shows you the gap between bank balance runway and true runway.

For a deeper look at how cash flow timing affects your financial position, see Cash Flow vs Runway. And for the complete framework behind deterministic financial tracking, read What Is Deterministic Finance?

Your runway is too important to calculate from incomplete data. Start with True Cash. The number might be uncomfortable, but it is real. And real numbers lead to real decisions.