Income Shock Survival Simulator
See how long savings survive without income
Calculate emergency fund duration if income completely stopped. Stress-test financial resilience and determine months of expenses covered by savings.
What this tool does
This calculator estimates how many months your liquid savings can cover living expenses when income drops or stops. It works by comparing your monthly essential expenses against any remaining income, then calculates how long your savings bridge the gap. The result shows your financial runway—the timeframe before savings are depleted, assuming expenses and income remain stable. The calculation is most sensitive to the size of your savings, your monthly expense level, and the amount of income reduction. For example, someone facing a job loss might input their current savings, fixed monthly costs (rent, utilities, food), the percentage of income they'd lose, and any continued earnings from a second job or freelance work. The output assumes no investment returns on savings, no changes to your spending patterns, and no additional income beyond what you enter. This is an educational illustration of how long existing funds might sustain you under the scenario you model.
Quick answer: with the default values, the result is 10 mo (Months of Financial Runway). Adjust the values below for your own figures.
Enter Values
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Formula Used
Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
What Is an Income Shock?
An income shock is any sudden, unexpected reduction or elimination of income — job loss, illness, economic downturn, or a business failing. Simulating this scenario helps you understand your true financial resilience before a crisis hits.
How to Use This Calculator
Enter your current savings and your essential monthly expenses. The calculator shows how many months you can survive without income, and what a partial income reduction looks like.
What Counts as an Essential Expense?
This is where many people get caught out. Essential expenses are the non-negotiables — rent or mortgage, utilities, food, insurance, minimum debt repayments. It can help to go through last month's bank statement and separate the genuine essentials from the nice-to-haves. Many people find they are spending more on essentials than they realised. That is not a judgment — it is just useful information to have before a crisis, rather than during one. Even a rough figure is worth plugging in here.
Things People Often Overlook
One thing this is may also matter is irregular expenses — annual bills, car repairs, or medical costs that do not show up every month but can derail a survival plan quickly. One approach is to estimate these yearly costs, divide by twelve, and add that figure to your monthly essentials. It gives a more complete picture of how long your savings would actually stretch. The goal is not to alarm you — it is simply to help you see your finances clearly, while there is still time to adapt.
A worked example
With the defaults: total liquid savings of 15,000, monthly essential expenses of 2,500, income reduction of 100, remaining monthly income of 1,000. The tool returns 10 mo.
What moves the number most
The result responds to Total Liquid Savings, Monthly Essential Expenses, Income Reduction, and Remaining Monthly Income.
The formula behind this
This calculator divides the total savings (S) by the monthly expense shortfall (expenses minus any passive income) to estimate months of financial runway. It assumes constant monthly expenses, no investment returns, and no changes to the income or spending patterns. Results represent a simplified illustration, not a guarantee of actual outcomes.
Savings longevity estimates indicate 10 mo if income decreases by 100%.
Inputs
| Monthly Shortfall | $1,500.00 |
|---|---|
| Income Lost | $100.00 |
| Partial Income | $1,000.00 |
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
This calculator divides total liquid savings by the monthly expense shortfall to estimate financial runway during an income disruption. The monthly shortfall is computed as essential monthly expenses minus remaining monthly income (after the reduction occurs). The model applies three core assumptions: expenses remain constant each month, savings earn no investment returns, and income and spending patterns do not change over time. The calculator does not account for taxes, discretionary spending adjustments, one-time costs, changes in essential expenses, variable income sources, or the timing of when savings may be depleted. Results represent a simplified illustration based on these static assumptions and do not predict actual financial outcomes.
Frequently Asked Questions
How long should my savings last if I lose my job?
What is the difference between liquid savings and total savings?
How do I work out my essential monthly expenses?
What if I still have some income coming in after a job loss?
Is three months of savings really enough of an emergency fund?
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