Building a Neobank: From Zero to Twenty Million Users

Consumer neobanks have achieved something remarkable: they have acquired tens of millions of users in markets dominated by some of the most entrenched incumbents in the economy, without charging those users a single dollar in fees. How do they do it, how do they make money, and what does it take to build a neobank that can actually reach scale? This is the playbook, as we see it from our vantage point as early investors.

The Neobank Model Explained

A neobank is a financial services company that operates primarily or exclusively through digital channels — smartphone apps, web platforms, and APIs — without the branch network, legacy IT infrastructure, and regulatory overhead of a traditional bank. Neobanks can operate under their own bank charter (requiring significant capital and regulatory time), as a licensed money services business, or as a front-end that partners with a licensed bank to provide the actual deposit insurance and regulatory infrastructure.

The partnership model has been the dominant go-to-market approach for consumer neobanks, because it allows companies to launch quickly without a bank charter while still offering FDIC-insured deposits, debit cards, and basic banking services. The neobank builds the product and acquires the customers; the banking partner provides the regulated infrastructure and balance sheet; the Banking-as-a-Service (BaaS) provider in between handles the technical integration.

This three-layer model has enabled the extraordinary growth rates of consumer neobanks. Chime, the largest US neobank, reached 22 million users faster than any traditional bank has added accounts in history. Revolut expanded from the UK to 35 countries with a fraction of the capital that traditional international banking expansion would have required. Dave, Current, and dozens of other neobanks have collectively created more consumer banking accounts in the last seven years than traditional banks created in the previous two decades.

The Free Model: How It Actually Works

The most counterintuitive aspect of the neobank model — to traditional bankers and investors alike — is that the most successful consumer neobanks offer their core product for free. No monthly fees, no minimum balance requirements, no overdraft fees (which are a major revenue driver for traditional banks). The marketing promise is simple: we will give you a better bank account than you have now, and we will not charge you for it.

How does this generate revenue? The answer is primarily interchange. When a customer uses a neobank debit card to make a purchase, the merchant pays a small percentage of the transaction — typically around 1-2% — to the card network (Visa or Mastercard), which distributes a share of that interchange revenue to the issuing bank, which in turn shares it with the neobank. On a consumer who spends $2,000 per month on their debit card, this generates approximately $30-40 per month in interchange revenue for the neobank, before costs.

This business model has an important implication: neobanks make more money from customers who spend more money. This creates a strong incentive to grow average spend per user — which neobanks pursue through features like early direct deposit access, cashback rewards, and premium account tiers that attract higher-spending users.

Beyond interchange, mature neobanks generate revenue from premium subscription tiers, interest income on deposits (which has become significant as interest rates have risen), cross-sell revenue from adjacent products (credit products, savings products, investment accounts), and B2B services (some neobanks have leveraged their consumer-facing technology to sell banking infrastructure services to other companies).

The Acquisition Playbook

Getting to twenty million users requires a disciplined customer acquisition strategy. The most successful neobanks have used a consistent playbook, adapted to their specific target segment, that combines organic growth engines with targeted paid acquisition.

The first organic growth engine is referral programs. Neobanks that pay existing customers cash or account credits for referring new customers have achieved some of the lowest cost-per-acquisition numbers in consumer fintech. The key is getting the incentive structure right: the reward must be large enough to motivate referrals but not so large that it attracts fraudulent behavior or customers who have no intention of actually using the product. The best referral programs we have seen pay both the referrer and the referee upon the referred customer completing a meaningful activation event — setting up direct deposit, making a certain number of transactions, or maintaining a minimum balance.

The second organic growth engine is community building around a shared identity or common problem. Chime built its early user base around people who were being harmed by overdraft fees — a specific, emotionally resonant pain point that created strong word-of-mouth. Greenlight built around parents who wanted a safe, educational banking experience for their children. Current focused on underbanked consumers who had been excluded from or mistreated by traditional banking. In each case, the neobank was not just selling a product — it was offering membership in a community with a shared identity and shared values.

Paid acquisition, when neobanks use it effectively, tends to be concentrated in a small number of high-ROI channels. Social media advertising targeting specific demographic profiles, partnerships with employers to offer neobank accounts as an employee benefit (which gives the neobank access to direct deposit setup at the moment of account opening), and content marketing focused on financial wellness for the target demographic are the most consistently effective paid channels we have seen.

The Retention Challenge

Acquiring twenty million users is a remarkable achievement. Keeping twenty million active users is a fundamentally different and harder problem. Banking product churn is structurally low — changing your primary bank account is a meaningful hassle — but secondary account churn can be very high. Many consumers open neobank accounts without closing their traditional bank accounts, using the neobank only for specific purposes (international travel, specific categories of spending) while maintaining their traditional account for direct deposit and primary banking.

The neobanks that have achieved genuine primary bank status — where the customer's direct deposit flows to the neobank and the neobank is their primary daily-spend account — have dramatically better economics than those where customers maintain the neobank as a secondary account. Direct deposit customers spend more, use more products, generate more interchange revenue, and are far less likely to churn.

Converting users from secondary to primary bank status is therefore one of the most important operational priorities for a scaling neobank. The most effective conversion strategies we have seen involve making direct deposit setup frictionless, rewarding customers who set up direct deposit with meaningful financial benefits (early access to paychecks, higher savings rates, bonus cashback), and gradually expanding the product suite to address more of the customer's financial life so that maintaining a separate traditional bank account feels increasingly unnecessary.

The Path to Profitability

Consumer neobanks have been rightfully criticized for growing large user bases without demonstrating a credible path to profitability. The criticism has merit in some cases, but it misses the structural reality of the neobank business model: per-user economics improve significantly as the user base matures and the product suite expands.

Early in a neobank's lifecycle, the customer base is dominated by newly acquired users who have not yet set up direct deposit, not yet adopted premium features, and not yet engaged with cross-sell products. The per-user economics of these early-stage customers are genuinely thin. As the cohort matures — as users set up direct deposit, try premium subscriptions, and adopt credit and savings products — per-user revenue grows substantially while marginal cost of service remains roughly constant. The economics of a three-year-old user are materially different from the economics of a three-month-old user.

The implication is that neobanks need to be evaluated on cohort economics — what does a specific cohort of users look like twelve months, twenty-four months, and thirty-six months after acquisition? — rather than on blended revenue per user at a single point in time. The best neobanks we have seen demonstrate dramatic cohort improvement over time, with older cohorts generating 3-5x the revenue per user of newly acquired cohorts. That is a very healthy long-term economic structure, even if the blended numbers look thin during aggressive growth phases.

What We Look For at the Seed Stage

When we evaluate neobank companies at the seed stage, we are looking for a small number of specific signals that predict whether a given team can actually execute the playbook described above. The first is a clear and defensible target segment — not "the underbanked" broadly, but a specific demographic or behavioral cohort with a specific pain point that the neobank is uniquely positioned to address. The second is a founding team that has direct experience with the target segment — ideally, founders who are members of the community they are trying to serve and who have personal insight into its financial needs. The third is a differentiated distribution strategy that can acquire the first hundred thousand users at an economically rational cost before the company needs to compete in the crowded paid acquisition channels where large incumbents have enormous advantages.