Stablecoins like USDC and USDT now yield 4-5% annually when held in money market protocols or reserve programs, yet most portfolio trackers ignore this income entirely. Morgan Stanley's new stablecoin fund and similar institutional offerings have made stablecoin yields a real alternative to bonds. Learning to track these returns alongside your stocks and crypto is essential for calculating true portfolio performance.
What are stablecoins and why do their yields matter to your portfolio?
A stablecoin is a cryptocurrency designed to maintain a fixed value (usually $1 USD) by backing each token with reserves of cash, securities, or other assets. Unlike Bitcoin or Ethereum, stablecoins don't fluctuate in price, making them useful as a stable store of value and income-generating asset.
The two most widely held stablecoins are USDC (USD Coin, issued by Circle) and USDT (Tether). Both trade on hundreds of exchanges and represent over $150 billion in combined market value. The critical difference for income investors: when held in yield-bearing programs, these stablecoins generate real returns that compound over time.
Traditional portfolio trackers ignore stablecoin income because it happens off-exchange, in custodial or protocol-based yield programs. This creates a blind spot in your performance calculation. A $50,000 USDC holding earning 4.5% annually generates $2,250 in income that a broker app won't show.
How do stablecoin yields compare to traditional money market funds?
Money market funds currently yield 4.5-5.2% depending on the fund and duration. USDC and USDT yields range from 3.8-5.1% depending on the platform and whether one is using a centralized exchange, decentralized lending protocol, or institutional custody solution.
- Schwab Money Market Fund (SPAXX): 5.11% as of early 2026
- Vanguard Federal Money Market Fund (VMFXX): 4.82%
- USDC via Aave (DeFi lending): 4.2-4.8% depending on supply/demand
- USDT via Compound (DeFi lending): 3.9-4.6%
- Coinbase USDC Yield program: 4.25%
The yield difference is negligible, but stablecoins offer one advantage: 24/7 settlement and no lockup periods. Money market funds settle T+1 in US markets. Stablecoins settle instantly on blockchain networks.
What is Morgan Stanley's stablecoin fund and how does it fit into your portfolio?
In late 2025, Morgan Stanley launched an institutional stablecoin fund designed to give accredited investors exposure to USDC and USDT yields without managing custody directly. The fund holds stablecoins in tokenized form on Ethereum and Polygon networks, with yields derived from reserve programs and short-term Treasury bill backing.
For retail investors, this signals institutional acceptance of stablecoin yields as a mainstream income strategy. Some investors who already track a Schwab or Interactive Brokers account add stablecoin positions outside their primary broker. This fragmentation creates tracking complexity.
The key insight: stablecoin holdings and their yields can be integrated into an overall portfolio performance calculation, rather than siloed. If Morgan Stanley is now offering this product, tax software and portfolio trackers need to handle it.
How to calculate weighted portfolio returns when holding stablecoins, bonds, and stocks together
Weighted average return accounts for the size of each position relative to a total portfolio. Stablecoin yields belong in this calculation to avoid underestimating true returns.
Here's a realistic example:
- Stocks: $100,000 (year-to-date return: +12%)
- Bonds: $30,000 (yield: 4.8%)
- USDC: $20,000 (stablecoin yield: 4.5%)
- Total portfolio: $150,000
Weighted return calculation:
- Stocks contribution: ($100,000 / $150,000) × 12% = 8.0%
- Bonds contribution: ($30,000 / $150,000) × 4.8% = 0.96%
- USDC contribution: ($20,000 / $150,000) × 4.5% = 0.60%
- Total portfolio return: 9.56%
Ignoring the stablecoin yield produces only 9.36%, missing 20 basis points of income. Over five years, this compounds into meaningful performance variance.
Which platforms and brokers let you track stablecoin yields automatically?
Most traditional brokers (Schwab, Fidelity, Interactive Brokers) do not natively track stablecoin holdings or yields. Crypto exchanges like Binance, Kraken, and Coinbase offer yield programs, but they don't integrate with traditional stock portfolios.
For comprehensive tracking across both asset classes, a multi-asset portfolio tracker is required:
- Crypto-native trackers (Koinly, Delta): Handle stablecoin yields but don't connect to stock brokers
- Traditional portfolio trackers (Morningstar, Quicken): Connect to stock and bond accounts but ignore crypto entirely
- Cross-asset trackers (PortfolioTrackr, Kubera): Support stocks, crypto, and manual yield entry, allowing you to log stablecoin income in one dashboard
PortfolioTrackr's multi-asset design lets you import USDC holdings from Coinbase or Binance and manually log the yield percentage, then automatically calculates weighted portfolio returns across all asset classes. This solves the fragmentation problem.
How to set up your stablecoin holdings for tax-efficient tracking
Stablecoin yields are taxable income in most jurisdictions, treated as ordinary income rather than capital gains. This matters for tax planning because ordinary income is taxed at a marginal rate, which could be 37% for high earners in the US.
Setup best practices:
- Keeping stablecoin holdings separate from trading accounts. A dedicated custody provider (Coinbase, Kraken, or a hardware wallet) for yield-bearing positions, rather than a trading account, keeps income separate from capital gains/losses in records.
- Logging yields quarterly, not just at tax time. Tracking USDC and USDT income monthly keeps clear records. In PortfolioTrackr, you can log each yield deposit as a dividend-equivalent transaction.
- How capital losses interact with stablecoin income. Realized crypto losses can offset ordinary income within the limits set by tax rules, which affects the overall tax burden.
- Roth accounts where available. Some crypto custodians now offer Roth IRA accounts (e.g., Coinbase self-custody IRA). Stablecoin yields inside a Roth grow tax-free.
Documentation is critical. Exchanges provide tax reports, but they often exclude off-exchange yields from protocols like Aave. Manual records in a portfolio tracker fill that gap.
Stablecoin opportunity costs: comparing cash versus alternatives
At 4.5% yield, USDC is competitive with traditional savings, but it's still lower than short-term Treasury bills (T-bills), which currently yield 5.2-5.4% for 3-month maturities.
The opportunity cost depends on circumstances:
- For traders: USDC's instant settlement (versus T+1 for Treasury purchases through brokers) can outweigh the 0.7% yield haircut.
- For long-term holders: Treasury bills carry a higher yield. A $50,000 position at 5.3% yields $2,650 annually, versus $2,250 in USDC yield, a difference of $400 per year.
- For institutional portfolios: Morgan Stanley's stablecoin fund bridges this gap by backing USDC with Treasury bills, offering near-Treasury yields with blockchain settlement.
The yield spread between Treasury bills and stablecoins shifts over time. A portfolio tracker lets you monitor that spread quarterly, and investors weigh liquidity, settlement speed, and after-tax yield differently depending on their own goals when deciding how to hold cash.
The bottom line: integrate stablecoin yields into your performance dashboard
Stablecoins have evolved from speculative assets to yield-bearing components of diversified portfolios. USDC and USDT now compete with money market funds on return, with the added benefit of 24/7 liquidity.
The challenge is tracking. Traditional brokers ignore stablecoin income, creating blind spots in your performance calculation. Just as tracking dividend income across multiple stock accounts requires consolidation, stablecoin yields must be aggregated with stock returns and bond yields to calculate true weighted portfolio performance.
A dedicated custody account (Coinbase, Kraken, or Aave) is one way holders separate stablecoin positions. Holdings and yields can be logged in a cross-asset portfolio tracker that supports both crypto and traditional assets. Stablecoin income is generally treated as taxable ordinary income, and realized capital losses can offset it within tax rules. Reviewing the yield spread against Treasury bills quarterly is one way to keep an eye on how cash is allocated.
Treating stablecoins as a deliberate income component rather than trading collateral is how some investors capture returns others miss and gain clarity on their true portfolio performance.
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Frequently asked questions
How much yield can I earn on USDC and USDT in 2026?
USDC yields 4.2-5.1% depending on the platform (Coinbase, Aave, Kraken). USDT yields 3.9-4.6%. These rates fluctuate with demand and Fed policy. Money market funds yield slightly higher at 4.8-5.2%, but stablecoins offer instant settlement.
Is stablecoin yield taxed differently than bond interest?
Yes. Stablecoin yields are treated as ordinary income taxed at your marginal rate, typically 22-37% in the US. Bond interest is also ordinary income, but stablecoin income is often not reported by exchanges, requiring manual tax record-keeping.
Can I hold USDC in a Roth IRA?
Some custodians like Coinbase now offer Roth IRA accounts with USDC holdings. Stablecoin yields inside a Roth grow tax-free. Check your provider's offerings, as this is still an emerging product category.
Should I choose USDC or USDT for yield?
Both are similarly yield-bearing, but USDC is more widely integrated with institutional platforms (including Morgan Stanley's new fund). USDT offers slightly higher yields on some DeFi platforms. Diversify between both rather than choosing one.
How does PortfolioTrackr help track stablecoin yields?
PortfolioTrackr lets you import USDC and USDT holdings from crypto exchanges, manually log yield percentages, and calculate weighted portfolio returns across stocks, bonds, and stablecoins in one dashboard. This eliminates the fragmentation of tracking income across multiple platforms.