LTUSX vs. TSSIX

Last updated Jun 25, 2026

LTUSX (Thornburg Limited Term U.S. Government Fund) and TSSIX (Thornburg Strategic Municipal Income Fund) are both mutual funds - LTUSX is a Government Bonds fund managed by Thornburg, while TSSIX is a Municipal Bonds fund managed by Thornburg. Over the past 10 years, LTUSX returned 0.98%/yr vs 2.09%/yr for TSSIX. At a 0.49 correlation, their price movements are largely independent. LTUSX charges 0.92%/yr vs 0.59%/yr for TSSIX.

Performance

LTUSX vs. TSSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg Limited Term U.S. Government Fund (LTUSX) and Thornburg Strategic Municipal Income Fund (TSSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, LTUSX achieves a 0.31% return, which is significantly lower than TSSIX's 2.07% return. Over the past 10 years, LTUSX has underperformed TSSIX with an annualized return of 0.98%, while TSSIX has yielded a comparatively higher 2.09% annualized return.

LTUSX

• 1D: 0.08%
• 1M: 0.26%
• YTD: 0.31%
• 6M: 0.37%
• 1Y: 3.51%
• 3Y*: 3.65%
• 5Y*: 0.71%
• 10Y*: 0.98%

TSSIX

• 1D: -0.14%
• 1M: 1.58%
• YTD: 2.07%
• 6M: 2.49%
• 1Y: 6.37%
• 3Y*: 5.03%
• 5Y*: 1.70%
• 10Y*: 2.09%

*Multi-year figures are annualized to reflect compound growth (CAGR)

LTUSX vs. TSSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
LTUSX Thornburg Limited Term U.S. Government Fund	0.31%	6.40%	2.40%	3.40%	-8.06%	-1.82%	3.77%	3.61%	0.98%	0.60%
TSSIX Thornburg Strategic Municipal Income Fund	2.07%	5.62%	3.77%	5.51%	-8.30%	1.50%	4.03%	5.99%	1.04%	4.21%

Correlation

The correlation between LTUSX and TSSIX is 0.47, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.47
Correlation (3Y) Calculated over the trailing 3-year period	0.57
Correlation (5Y) Calculated over the trailing 5-year period	0.52
Correlation (10Y) Calculated over the trailing 10-year period	0.50
Correlation (All Time) Calculated using the full available price history since Apr 1, 2009	0.49

The correlation between LTUSX and TSSIX has been stable across timeframes, ranging from 0.47 to 0.57 - a consistent structural relationship.

Return for Risk

LTUSX vs. TSSIX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

LTUSX

LTUSX Risk / Return Rank: 26
LTUSX Sharpe Ratio Rank: 28
LTUSX Sortino Ratio Rank: 29
LTUSX Omega Ratio Rank: 27
LTUSX Calmar Ratio Rank: 26
LTUSX Martin Ratio Rank: 21

TSSIX

TSSIX Risk / Return Rank: 75
TSSIX Sharpe Ratio Rank: 85
TSSIX Sortino Ratio Rank: 92
TSSIX Omega Ratio Rank: 93
TSSIX Calmar Ratio Rank: 54
TSSIX Martin Ratio Rank: 52

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

LTUSX vs. TSSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg Limited Term U.S. Government Fund (LTUSX) and Thornburg Strategic Municipal Income Fund (TSSIX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	LTUSX	TSSIX	Difference
Sharpe ratio: Return per unit of total volatility	1.30	2.51	-1.20
Sortino ratio: Return per unit of downside risk	1.94	4.11	-2.17
Omega ratio: Gain probability vs. loss probability	1.23	1.66	-0.43
Calmar ratio: Return relative to maximum drawdown	1.64	2.60	-0.96
Martin ratio: Return relative to average drawdown	4.39	9.65	-5.26

LTUSX vs. TSSIX - Sharpe Ratio Comparison

The current LTUSX Sharpe Ratio is 1.30, which is lower than the TSSIX Sharpe Ratio of 2.51. The chart below compares the historical Sharpe Ratios of LTUSX and TSSIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

LTUSX vs. TSSIX - Drawdown Comparison

The maximum LTUSX drawdown since its inception was -12.34%, roughly equal to the maximum TSSIX drawdown of -12.64%. Use the drawdown chart below to compare losses from any high point for LTUSX and TSSIX.

Drawdown Indicators

	LTUSX	TSSIX	Difference
Max Drawdown Largest peak-to-trough decline	-12.34%	-12.64%	+0.30%
Max Drawdown (1Y) Largest decline over 1 year	-2.31%	-2.46%	+0.15%
Max Drawdown (3Y) Largest decline over 3 years	-3.69%	-4.67%	+0.98%
Max Drawdown (5Y) Largest decline over 5 years	-11.69%	-12.64%	+0.95%
Max Drawdown (10Y) Largest decline over 10 years	-12.34%	-12.64%	+0.30%
Current Drawdown Current decline from peak	-1.66%	-0.14%	-1.52%
Average Drawdown Average peak-to-trough decline	-1.40%	-1.97%	+0.57%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.86%	0.66%	+0.20%

Volatility

LTUSX vs. TSSIX - Volatility Comparison

Thornburg Limited Term U.S. Government Fund (LTUSX) has a higher volatility of 0.93% compared to Thornburg Strategic Municipal Income Fund (TSSIX) at 0.70%. This indicates that LTUSX's price experiences larger fluctuations and is considered to be riskier than TSSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	LTUSX	TSSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.93%	0.70%	+0.23%
Volatility (6M) Calculated over the trailing 6-month period	2.13%	1.85%	+0.28%
Volatility (1Y) Calculated over the trailing 1-year period	2.90%	2.55%	+0.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.03%	3.62%	+0.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.09%	3.48%	-0.39%

LTUSX vs. TSSIX - Expense Ratio Comparison

LTUSX has a 0.92% expense ratio, which is higher than TSSIX's 0.59% expense ratio.

Dividends

LTUSX vs. TSSIX - Dividend Comparison

LTUSX's dividend yield for the trailing twelve months is around 2.63%, less than TSSIX's 4.13% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
LTUSX Thornburg Limited Term U.S. Government Fund	2.63%	2.69%	2.62%	1.89%	1.63%	1.21%	1.35%	1.77%	1.90%	1.45%	2.52%	1.50%
TSSIX Thornburg Strategic Municipal Income Fund	4.13%	5.27%	4.42%	2.86%	2.48%	2.08%	2.61%	2.95%	2.76%	2.65%	2.40%	2.63%

Frequently Asked Questions

Can I hold both LTUSX and TSSIX in my portfolio?

LTUSX and TSSIX have a correlation of 0.47, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, LTUSX or TSSIX?

LTUSX has higher volatility (0.93%) compared to TSSIX (0.70%). In terms of maximum drawdown, LTUSX dropped -12.34% vs TSSIX's -12.64%.

Which has better risk-adjusted returns?

TSSIX currently has the higher Sharpe Ratio (2.51 vs 1.30), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.