iShares Short-Term National Muni Bond ETF (SUB) Source: Shutterstock Expense ratio: 0.07%, or $7 annually on a $10,000 investment Finally, iShares Short-Term National Muni Bond ETF (NYSEARCA:SUB) offers high yield alongside tax benefits for those eyeing next year’s annual filing. Ultimately, diversifying into a series of short-term bond ETFs can help protect your capital while offering greater income opportunities and shielding against inflation. At the same time, since the Treasurys within SGOV are so short-dated, the per-share price is remarkably stable and doesn’t expose you to as much principal risk as yield curves rebalance.