Why foregone earnings matter to a first-time founder
Leaving paid work to build a company has an economic cost even when no cash leaves the business. Tracking foregone earnings helps founders compare the venture with realistic alternatives and discuss personal runway honestly. It should inform a decision without pretending that an uncertain future salary is a bill the company currently owes.
Examples of foregone earnings
A founder leaves a job paying £60,000 a year and pays themselves £18,000 from the start-up during the first year. Their foregone earnings are approximately £42,000 before considering benefits, tax or salary growth. That amount is an opportunity cost to the founder, not automatically a business expense or liability.
Common misunderstanding
Foregone earnings are not the same as an accounting loss or unpaid salary. They measure income sacrificed by choosing one path over another. The comparison should use a credible alternative, not an imagined best case. Equity value may eventually compensate the founder, but it is uncertain and should not be counted as earned income.
When to use it
Estimate foregone earnings when deciding whether to work full-time on the company, how much personal runway you need or whether an acquisition offer justifies continuing. Update the comparison when circumstances change. Do not load the figure into company accounts unless an actual salary obligation exists under the relevant agreement and accounting rules.