The Stablecoin Float Calculator: How Much Revenue Are You Leaving on the Table?

Let's skip the preamble and get to the number that matters.

If your business processes payments — or holds customer funds for any length of time — you have float. Float is money sitting in your pipeline. It's there for hours, days, sometimes weeks. And right now, it's earning you almost nothing.

Your bank pays 0.3-0.5% APY on those balances. Maybe 1% if you've negotiated hard. Meanwhile, the same dollars converted to USDC could earn 4-8% APY through institutional-grade yield strategies backed by US Treasuries.

That gap is money you're leaving on the table. Every single day.

We're going to do the math together. By the end of this post, you'll know your exact number — and you'll probably be annoyed that you didn't do this sooner.

Understanding Your Float

Before we calculate yield, let's make sure we're measuring the right thing.

Float is the average amount of money sitting in your accounts at any given moment between receipt and disbursement. It's not your monthly volume — it's the balance that's constantly "in transit."

Here's a simple way to estimate it:

Average float = Monthly volume x (Average hold time / 30)

If you process $10M per month and funds sit in your accounts for an average of 5 days before being disbursed:

Average float = $10M x (5/30) = $1.67M

That $1.67M is your yield-bearing base. It's always there — as one batch settles out, the next batch flows in. It's a perpetual balance.

Different business models have very different float profiles:

• Payment processors: 2-5 days of float (settlement delay)

• Neobanks: Continuous float (customer deposits)

• Marketplaces: 5-14 days of float (seller payout cycles)

• Lending platforms: 30-90 days of float (loan principal in pipeline)

• Payroll platforms: 1-3 days of float (payroll funding to disbursement)

• Insurance tech: 30-90 days of float (premium collection to claims)

The longer the hold time and the larger the volume, the bigger the opportunity.

The Core Math: Yield at Scale

Here's where it gets real. The tables below show annual yield at different float levels and APY rates. We're comparing against a baseline of 0.5% APY (a typical bank deposit rate).

Annual Yield by Average Float Size

Average Float | Bank (0.5% APY) | Conservative (4% APY) | Moderate (6% APY) | Aggressive (8% APY) **$1M** | $5,000 | $40,000 | $60,000 | $80,000 **$5M** | $25,000 | $200,000 | $300,000 | $400,000 **$10M** | $50,000 | $400,000 | $600,000 | $800,000 **$25M** | $125,000 | $1,000,000 | $1,500,000 | $2,000,000 **$50M** | $250,000 | $2,000,000 | $3,000,000 | $4,000,000 **$100M** | $500,000 | $4,000,000 | $6,000,000 | $8,000,000

The Delta: What You're Missing

This table shows the additional revenue you'd earn above your current bank yield:

Average Float | Delta at 4% APY | Delta at 6% APY | Delta at 8% APY **$1M** | **$35,000** | **$55,000** | **$75,000** **$5M** | **$175,000** | **$275,000** | **$375,000** **$10M** | **$350,000** | **$550,000** | **$750,000** **$25M** | **$875,000** | **$1,375,000** | **$1,875,000** **$50M** | **$1,750,000** | **$2,750,000** | **$3,750,000** **$100M** | **$3,500,000** | **$5,500,000** | **$7,500,000**

Look at your row. That's what you're leaving on the table every year.

A $10M average float earning 6% instead of 0.5% generates $550,000 in additional annual revenue. That's pure margin. No customer acquisition cost. No additional infrastructure. No headcount.

The Compound Effect: 12-Month Projections

The tables above show simple annual yield. But if you reinvest the yield (compound it), the numbers get even better. Here's what happens over 12 months with monthly compounding:

12-Month Compound Yield (Monthly Reinvestment)

Average Float | 4% APY (compounded) | 6% APY (compounded) | 8% APY (compounded) **$1M** | $40,742 | $61,678 | $83,000 **$5M** | $203,710 | $308,390 | $414,998 **$10M** | $407,420 | $616,778 | $829,995 **$25M** | $1,018,550 | $1,541,945 | $2,074,989 **$50M** | $2,037,100 | $3,083,890 | $4,149,978 **$100M** | $4,074,200 | $6,167,781 | $8,299,955

The compound effect adds roughly 1.8-3.7% to your total yield over 12 months, depending on the APY. It's not dramatic, but it's free money on top of free money.

Real-World Scenarios

Let's make this concrete with three business profiles.

Scenario 1: Mid-Size Payment Processor

• Monthly volume: $15M

• Average hold time: 3 days

• Average float: $15M x (3/30) = $1.5M

• Current bank yield: $7,500/year

• Stablecoin yield at 5% APY: $75,000/year

• Annual delta: $67,500

Not life-changing — but it covers the cost of implementation in year one and becomes pure profit in year two. And as volume grows, the yield scales linearly.

Scenario 2: Marketplace Platform

• Monthly volume: $40M

• Average hold time: 10 days (weekly seller payouts + processing)

• Average float: $40M x (10/30) = $13.3M

• Current bank yield: $66,500/year

• Stablecoin yield at 5% APY: $665,000/year

• Annual delta: $598,500

Now we're talking. Nearly $600K in new annual revenue. That's a meaningful line item. For a Series B marketplace doing $480M in annual GMV, this is accretive margin that drops straight to the bottom line.

Scenario 3: Neobank / Digital Wallet

• Monthly deposits held: $80M average balance

• Average hold time: Continuous (customer deposits)

• Average float: $80M

• Current bank yield: $400,000/year (0.5% on deposits)

• Stablecoin yield at 5% APY: $4,000,000/year

• Annual delta: $3,600,000

$3.6M per year. And here's the kicker — many neobanks pass a portion of this yield to customers as a competitive feature (earning them deposits), while keeping the spread. Even passing through 2% APY to customers and keeping the 3% spread on $80M generates $2.4M annually.

What About the Yield Strategies?

You're probably wondering: where does 4-8% APY come from? Is it sustainable? Is it real?

Short answer: yes, it's real. The yield comes from two primary sources.

Source 1: US Treasury Yield Pass-Through

The simplest version. US Treasuries currently yield roughly 4-4.5%. When you hold USDC in certain protocols or structured products, you're essentially getting exposure to Treasury yield on-chain. The mechanism varies — sometimes it's through tokenized Treasuries (like Ondo's USDY or Mountain Protocol's USDM), sometimes through lending markets where the borrowers are posting Treasuries as collateral.

This is the conservative tier. Lower yield, lower risk. The yield tracks the Fed Funds Rate closely.

Source 2: Lending Market Yield

DeFi lending protocols like Aave, Compound, and Morpho allow you to lend stablecoins to borrowers. Borrowers pay interest; lenders (you) earn yield. Current rates for USDC on major protocols range from 4-8% APY depending on utilization.

The borrowers are typically crypto traders using leverage, or institutions using stablecoins for short-term liquidity. The loans are over-collateralized — meaning the borrower deposits $150 worth of ETH to borrow $100 in USDC. If the collateral drops in value, the position is automatically liquidated before the lender takes a loss.

This is the moderate tier. Higher yield, slightly more risk (smart contract risk, liquidation mechanism risk). But these protocols have been running for 5+ years and have processed hundreds of billions in loans.

What We Recommend

For treasury and float management, we recommend a blended approach:

• 60-70% in conservative strategies (Treasury pass-through, 4-4.5% APY)

• 20-30% in moderate strategies (blue-chip DeFi lending, 5-7% APY)

• 0-10% in higher-yield opportunities (only if risk appetite allows)

Blended target: 4.5-5.5% APY with an institutional-grade risk profile.

Never put 100% of float into any single strategy or protocol. Diversification matters here just like it matters in traditional finance.

The Hidden Benefit: Growing Float

Here's something most people miss in the initial calculation. Stablecoin infrastructure doesn't just earn yield on your existing float — it can grow your float.

How?

1. Faster settlement attracts volume. If you can offer same-day or instant settlement to merchants (because your stablecoin rails settle in seconds, not days), you'll win business from competitors still on T+2 ACH settlement. More volume = more float.

2. Yield sharing attracts deposits. If you're a neobank or wallet, passing through a portion of yield to customers (say, 2-3% APY on their deposits) is a powerful acquisition and retention tool. More deposits = more float.

3. Cross-border capability opens new markets. Stablecoin rails work globally, 24/7. If you can serve international corridors that your competitors can't (or charge less for), you'll capture additional volume. More volume = more float.

The yield calculator above shows a static snapshot. The real business case is dynamic — stablecoin infrastructure drives float growth, which drives more yield, which funds more growth. It's a flywheel.

Cost-Benefit Summary

Let's put it all in one place for a $10M average float scenario:

Costs (Year 1)

Item | Cost Legal and compliance review | $50,000 Custody provider setup | $25,000 Engineering (3 engineers, 4 months) | $150,000 Security audit | $30,000 Ongoing monitoring (0.5 FTE) | $60,000 Custody and platform fees | $30,000 **Total Year 1 Cost** | **$345,000**

Revenue (Year 1)

Item | Revenue Yield at 5% APY on $10M | $500,000 Less: bank yield foregone (0.5%) | -$50,000 **Net New Revenue** | **$450,000**

Net Impact

Metric | Value Year 1 net gain | $105,000 Year 2 net gain (costs drop to ~$90K ongoing) | $360,000 3-year cumulative gain | $825,000

The investment is profitable in year one. By year two, it's generating 4x its operating cost. And these numbers don't account for the float growth flywheel.

Your Next Step

Find your number. Right now.

1. Pull your average float balance (or estimate it: monthly volume x average hold days / 30)

2. Find your row in the tables above

3. Look at the delta column at 5% APY

4. Ask yourself: "Do I have a good reason NOT to capture this revenue?"

If you want to go deeper on the implementation side, read our 101 guide for fintech CTOs. If you need to convince your board, grab our board pitch playbook. If you want to understand the stablecoin options, check our USDC vs USDT vs PYUSD comparison.

Or just talk to us. We'll run the numbers with you — no obligation, no pitch. Just math.

The float is already there. The yield is already there. The only thing missing is the infrastructure to connect them.

Frequently Asked Questions

Does the APY fluctuate, or is it locked in?

Stablecoin yield fluctuates based on market conditions, Federal Reserve rate decisions, and DeFi protocol utilization. Over the past 18 months, conservative stablecoin yield strategies have ranged from 3.2% to 6.8% APY, with the median sitting around 4.5%. The primary driver is the federal funds rate because most stablecoin yield ultimately derives from US Treasury exposure. When the Fed holds rates at 5.25% to 5.50%, USDC yield strategies consistently deliver 4% to 5%. Rate movements take 2 to 4 weeks to fully propagate through stablecoin yield markets. DeFi lending rates add a variable component on top of the Treasury-backed baseline. During periods of high borrowing demand, lending yields on platforms like Aave and Morpho spike to 6% to 8%, while low-demand periods compress yields toward the Treasury floor. The practical implication for treasury planning is to model yield conservatively at 3.5% to 4% annualized and treat anything above that as upside rather than expected revenue.

What's the minimum hold time for yield to make sense?

Yield accrues continuously from the moment stablecoins are deposited into a yield-generating position. Holding USDC in a lending protocol for a single day at 4.5% APY earns approximately 0.012% on that day's balance. For $1 million in float, that is roughly $123 per day. The practical minimum hold time depends on transaction costs rather than yield mechanics. Moving funds into and out of a yield position costs $2 to $8 in gas fees on Ethereum mainnet, or under $0.10 on Layer 2 networks like Arbitrum or Base. On Ethereum mainnet, you need to hold for at least 3 to 5 days for the yield to exceed round-trip gas costs on a $100,000 position. On Layer 2 networks, even a single day of yield on $10,000 covers gas costs. For settlement float with predictable hold periods of 2 to 7 days, the math works cleanly on any network. The infrastructure automatically selects the optimal network based on float duration and amount to maximize net yield.

Is the yield guaranteed?

Guaranteed returns do not exist anywhere in finance, and anyone claiming guaranteed stablecoin yield should be treated with extreme skepticism. Bank deposit rates change without notice, money market fund yields fluctuate daily, and stablecoin yields follow the same market dynamics. The distinction is in risk profile, not certainty. Conservative stablecoin yield strategies using overcollateralized DeFi lending protocols have a different risk profile than speculative yield farming. On Aave, borrowers post 150% to 200% collateral against their loans, meaning lender principal is protected unless collateral values drop by 50% or more in a single liquidation cycle. In over 4 years of operation, Aave has processed $50 billion in loans with zero lender principal losses on major stablecoin markets. Morpho Blue, which optimizes Aave and Compound rates, has similarly maintained a clean track record across $2 billion in supplied assets. Risk exists in smart contract vulnerabilities and extreme market events, but these are quantifiable and insurable risks rather than speculative ones.federal funds rate, which the Fed adjusts periodically. The risk of losing principal is separate from yield variability — in conservative strategies, principal loss risk is very low (but not zero). We always recommend treating yield projections as estimates, not commitments.

How is the yield taxed?

Yield from stablecoin lending and DeFi strategies is generally treated as ordinary income for US tax purposes, taxed at your marginal rate of 10% to 37% depending on your bracket. The IRS treats DeFi lending yield similarly to interest income from bank deposits or bond coupon payments. For corporate entities, stablecoin yield flows through as ordinary business income on your corporate return. Tax reporting requires tracking yield accrual on a daily or monthly basis depending on your accounting method. Each yield-generating position creates a taxable event when yield is realized, which varies by protocol. Some protocols auto-compound yield continuously, creating a tracking challenge that requires specialized software. Tools like CoinTracker, Koinly, and TokenTax handle this automatically with API connections to major DeFi protocols, costing $500 to $2,000 annually for business accounts. For international operations, consult jurisdiction-specific guidance because treatment varies significantly. The EU generally treats stablecoin yield as capital income, while Singapore exempts certain digital token income under the Payment Services Act.

Can I withdraw at any time, or is there a lock-up?

Withdrawal flexibility depends entirely on the underlying yield strategy. In DeFi lending protocols like Aave, Compound, and Morpho, withdrawals are instant with zero lock-up. You can pull funds out in under 60 seconds at any time, 24 hours a day, 7 days a week. Utilization rates on these protocols typically run 70% to 85%, meaning sufficient liquidity exists for immediate withdrawals under normal conditions. During extreme market events, utilization can spike to 95% or higher, temporarily limiting withdrawal amounts. In practice, this has affected withdrawals for less than 48 hours across all major events since 2021. Structured yield products or vaults may impose lock-up periods ranging from 7 to 90 days in exchange for higher yields, typically 1% to 2% above liquid strategies. For settlement float and treasury management, liquid strategies with no lock-up are recommended because your float needs to be accessible within your settlement cycle. RebelFi's infrastructure exclusively uses liquid yield strategies to ensure funds remain available within the settlement windows your business requires.

What if the Fed cuts rates? Does stablecoin yield drop to zero?

Treasury-backed stablecoin yields track the federal funds rate closely because the underlying mechanism is identical. If the Fed cuts to 3%, Treasury-backed stablecoin yields drop to approximately 2.5% to 3%. At 2%, yields compress to 1.5% to 2%. Stablecoin yield does not drop to zero unless the Fed returns to the zero-interest-rate environment of 2020 to 2021, which current projections do not anticipate before 2028 at the earliest. DeFi-native yield provides a floor that operates independently of Treasury rates. Borrowing demand for stablecoins in decentralized markets generates yield from trading leverage, delta-neutral strategies, and cross-exchange arbitrage. During the zero-rate period of 2020 to 2021, DeFi stablecoin yields still averaged 2% to 4% from these demand-driven sources. A blended strategy combining Treasury-backed yield with DeFi lending provides resilience across rate environments. Even in a 2% Fed rate scenario, blended strategies target 2.5% to 3.5% APY. For a company with $5 million in float, that generates $125,000 to $175,000 annually.

How does this compare to money market funds?

Institutional money market funds yield 4% to 4.5% APY currently, comparable to conservative stablecoin yield strategies. The headline rates look similar, but operational characteristics differ substantially. Money market funds require T+1 or T+2 redemption, meaning you wait 1 to 2 business days to access funds. Stablecoin yield positions on DeFi protocols offer instant redemption 24/7/365 with no business day restrictions. For settlement float where you need funds available within specific windows, instant liquidity is a meaningful advantage. Money market funds charge management fees of 0.15% to 0.40% annually, reducing effective yield. Stablecoin infrastructure fees run 0.10% to 0.25%. Money market funds provide FDIC insurance up to $250,000 per depositor through sweep programs, which stablecoin strategies lack. However, money market funds have broken the buck twice (1994 and 2008), proving they carry risk too. For companies with over $5 million in float, consider a split: 50% to 60% in money market funds for regulatory comfort, 40% to 50% in stablecoin yield for liquidity and 24/7 accessibility.