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. If you hold $50,000 in USDC earning 4.5% annually, that's $2,250 in income your 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 you're 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. If you're already tracking a Schwab or Interactive Brokers account, you might be tempted to add stablecoin positions outside your primary broker. This fragmentation creates tracking complexity.
The key insight: stablecoin holdings and their yields must be integrated into your overall portfolio performance calculation, not 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 your total portfolio. Stablecoin yields must be included in this calculation to avoid underestimating your 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%
If you ignore the stablecoin yield, you'd calculate 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, you need a multi-asset portfolio tracker:
- 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 your marginal rate, which could be 37% for high earners in the US.
Setup best practices:
- Keep stablecoin holdings separate from trading accounts. Use a dedicated custody provider (Coinbase, Kraken, or a hardware wallet) for yield-bearing positions, not a trading account. This prevents mixing income with capital gains/losses.
- Log yields quarterly, not just at tax time. Track USDC and USDT income monthly so you have clear records. If you're using PortfolioTrackr, you can log each yield deposit as a dividend-equivalent transaction.
- Offset stablecoin income with capital losses. If you sold crypto at a loss, use those losses to offset stablecoin income, reducing your tax burden.
- Consider 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. Keep manual records in your portfolio tracker.
Stablecoin opportunity costs: when to hold 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 your circumstances:
- For traders: USDC's instant settlement (versus T+1 for Treasury purchases through brokers) makes it worth the 0.7% yield haircut.
- For long-term holders: Treasury bills are the better choice. 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.
In your portfolio tracker, monitor the yield spread quarterly. If Treasury bill rates drop below stablecoin yields, rotate into stablecoins. If rates rise above stablecoins, shift to T-bills.
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.
Setup your stablecoin positions in a dedicated custody account (Coinbase, Kraken, or Aave). Log holdings and yields in a cross-asset portfolio tracker that supports both crypto and traditional assets. Treat stablecoin income as taxable ordinary income and offset with realized capital losses. Review the yield spread against Treasury bills quarterly to optimize cash allocation.
By treating stablecoins as a deliberate income strategy rather than trading collateral, you'll capture returns most investors miss and gain clarity on your 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.