iShares' IGIB or MUB: Which Bond ETF Keeps More Money in Your Pocket?

The iShares 5-10 Year Investment Grade Corporate Bond ETF (NASDAQ:IGIB) provides exposure to corporate debt with a higher yield, while the iShares National Muni Bond ETF (NYSEMKT:MUB) focuses on high-quality municipal bonds.

Investors seeking fixed-income stability may weigh the higher yields of corporate bonds against the potential tax benefits of municipal debt. This comparison explores how these two iShares funds differ in cost, volatility, and income generation for conservative portfolios looking to balance risk and return in a changing interest rate environment.

Snapshot (cost & size)

Beta measures price volatility relative to the S&P 500; beta is calculated from monthly returns over the available fund history (up to five years). The 1-yr return represents total return over the trailing 12 months. Dividend yield is the trailing-12-month distribution yield.

The iShares 5-10 Year Investment Grade Corporate Bond ETF is slightly more affordable, carrying a 0.04% expense ratio compared to 0.05% for the municipal bond fund. It also offers a significantly higher payout, with a 1.68 percentage point difference in dividend yield.

Performance & risk comparison

What's inside

The iShares 5-10 Year Investment Grade Corporate Bond ETF focuses on high-quality corporate debt with maturities ranging from five to 10 years. It holds 3,017 securities, and its largest positions include a diversified mix where no single bond issue exceeds 0.22% of the portfolio. The fund launched in 2007. It provides targeted exposure to investment-grade issuers while maintaining significant diversification. iShares 5-10 Year Investment Grade Corporate Bond ETF has paid $2.57 per share over the trailing 12 months, which on its recent ~$52.41 share price works out to a 4.9% yield.

The iShares National Muni Bond ETF holds 7,016 investment-grade municipal bonds issued across the United States. Its largest positions include a vast array of debt where no single holding exceeds 0.19% of its assets under management (AUM). The fund also launched in 2007. It provides a way to access the tax-exempt bond market with a high degree of liquidity and breadth. iShares National Muni Bond ETF has paid $3.41 per share over the trailing 12 months, which on its recent ~$105.39 share price works out to a 3.2% yield.

For more guidance on ETF investing, check out the full guide at this link.

Which looks like the better buy

The most important number in this comparison is not the yield, it's your tax bracket. While IGIB's corporate bond income looks more attractive on paper, every dollar it distributes is fully taxable at the federal level. MUB's municipal bond income is generally exempt from federal taxes, which reframes the comparison entirely for investors writing larger checks to the IRS each April.

If you're in the 32% or 37% federal bracket and are holding bonds in a taxable brokerage account, MUB's after-tax income can match or exceed IGIB's despite the lower stated yield. The IRS takes a meaningful share of IGIB's distributions before they reach your account, a cost that never shows up in the expense ratio but clearly affects your take-home income.

So, the better buy here depends almost entirely on where you sit on the tax scale and where you are holding the fund. Lower-bracket investors and those in retirement accounts will find IGIB's higher yield the more straightforward win. For higher-bracket investors holding bonds in a taxable brokerage account, MUB's tax exemption does the heavy lifting that IGIB's headline yield cannot.

Sara Appino has no position in any of the stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.