TLMIX vs. TSSIX

Last updated Jun 4, 2026

TLMIX (Thornburg Short Duration Municipal Fund) and TSSIX (Thornburg Strategic Municipal Income Fund) are both Municipal Bonds funds from Thornburg. Over the past 10 years, TLMIX returned 1.33%/yr vs 2.18%/yr for TSSIX. A 0.55 correlation means they provide meaningful diversification when combined. TLMIX charges 0.50%/yr vs 0.59%/yr for TSSIX.

Performance

TLMIX vs. TSSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Thornburg Short Duration Municipal Fund (TLMIX) 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, TLMIX achieves a 1.01% return, which is significantly lower than TSSIX's 1.92% return. Over the past 10 years, TLMIX has underperformed TSSIX with an annualized return of 1.33%, while TSSIX has yielded a comparatively higher 2.18% annualized return.

TLMIX

• 1D: 0.00%
• 1M: 0.27%
• YTD: 1.01%
• 6M: 1.36%
• 1Y: 3.37%
• 3Y*: 3.36%
• 5Y*: 1.60%
• 10Y*: 1.33%

TSSIX

• 1D: 0.21%
• 1M: 0.79%
• YTD: 1.92%
• 6M: 1.98%
• 1Y: 6.60%
• 3Y*: 5.11%
• 5Y*: 1.65%
• 10Y*: 2.18%

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

TLMIX vs. TSSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TLMIX Thornburg Short Duration Municipal Fund	1.01%	3.74%	2.75%	3.25%	-2.46%	-0.05%	1.00%	2.12%	1.26%	1.08%
TSSIX Thornburg Strategic Municipal Income Fund	1.92%	5.62%	3.77%	5.51%	-8.30%	1.50%	4.03%	5.99%	1.04%	4.21%

Correlation

The correlation between TLMIX and TSSIX is 0.51, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.51
Correlation (3Y) Calculated over the trailing 3-year period	0.65
Correlation (5Y) Calculated over the trailing 5-year period	0.67
Correlation (10Y) Calculated over the trailing 10-year period	0.58
Correlation (All Time) Calculated using the full available price history since Jan 3, 2014	0.55

The correlation between TLMIX and TSSIX shifts across timeframes, from 0.51 (1 year) to 0.67 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

TLMIX vs. TSSIX — Risk / Return Rank

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

TLMIX

TLMIX Risk / Return Rank: 83
TLMIX Sharpe Ratio Rank: 85
TLMIX Sortino Ratio Rank: 97
TLMIX Omega Ratio Rank: 97
TLMIX Calmar Ratio Rank: 74
TLMIX Martin Ratio Rank: 62

TSSIX

TSSIX Risk / Return Rank: 70
TSSIX Sharpe Ratio Rank: 77
TSSIX Sortino Ratio Rank: 87
TSSIX Omega Ratio Rank: 92
TSSIX Calmar Ratio Rank: 48
TSSIX Martin Ratio Rank: 47

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.

TLMIX vs. TSSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Thornburg Short Duration Municipal Fund (TLMIX) 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.

	TLMIX	TSSIX	Difference
Sharpe ratio Return per unit of total volatility	2.80	2.54	+0.26
Sortino ratio Return per unit of downside risk	5.86	4.17	+1.69
Omega ratio Gain probability vs. loss probability	2.04	1.68	+0.36
Calmar ratio Return relative to maximum drawdown	3.38	2.63	+0.75
Martin ratio Return relative to average drawdown	12.26	9.78	+2.49
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TLMIX vs. TSSIX - Sharpe Ratio Comparison

The current TLMIX Sharpe Ratio is 2.80, which is comparable to the TSSIX Sharpe Ratio of 2.54. The chart below compares the historical Sharpe Ratios of TLMIX 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.

Sharpe Ratios by Period

	TLMIX	TSSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.80	2.54	+0.26
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	1.17	0.46	+0.72
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	1.14	0.63	+0.52
Sharpe Ratio (All Time) Calculated using the full available price history	1.10	1.34	-0.24

Drawdowns

TLMIX vs. TSSIX - Drawdown Comparison

The maximum TLMIX drawdown since its inception was -4.15%, smaller than the maximum TSSIX drawdown of -12.64%. Use the drawdown chart below to compare losses from any high point for TLMIX and TSSIX.

Drawdown Indicators

	TLMIX	TSSIX	Difference
Max Drawdown Largest peak-to-trough decline	-4.15%	-12.64%	+8.49%
Max Drawdown (1Y) Largest decline over 1 year	-1.00%	-2.46%	+1.46%
Max Drawdown (3Y) Largest decline over 3 years	-1.17%	-4.67%	+3.50%
Max Drawdown (5Y) Largest decline over 5 years	-4.15%	-12.64%	+8.49%
Max Drawdown (10Y) Largest decline over 10 years	-4.15%	-12.64%	+8.49%
Current Drawdown Current decline from peak	-0.11%	0.00%	-0.11%
Average Drawdown Average peak-to-trough decline	-0.48%	-1.98%	+1.50%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.28%	0.66%	-0.38%

Volatility

TLMIX vs. TSSIX - Volatility Comparison

The current volatility for Thornburg Short Duration Municipal Fund (TLMIX) is 0.44%, while Thornburg Strategic Municipal Income Fund (TSSIX) has a volatility of 0.91%. This indicates that TLMIX experiences smaller price fluctuations and is considered to be less risky than TSSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TLMIX	TSSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.44%	0.91%	-0.47%
Volatility (6M) Calculated over the trailing 6-month period	0.93%	1.85%	-0.92%
Volatility (1Y) Calculated over the trailing 1-year period	1.21%	2.55%	-1.34%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.37%	3.62%	-2.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.16%	3.48%	-2.32%

TLMIX vs. TSSIX - Expense Ratio Comparison

TLMIX has a 0.50% expense ratio, which is lower than TSSIX's 0.59% expense ratio.

Dividends

TLMIX vs. TSSIX - Dividend Comparison

TLMIX's dividend yield for the trailing twelve months is around 3.23%, less than TSSIX's 4.13% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TLMIX Thornburg Short Duration Municipal Fund	3.23%	3.25%	3.30%	2.34%	1.15%	0.44%	1.07%	1.45%	1.33%	0.99%	0.47%	0.32%
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 TLMIX and TSSIX in my portfolio?

TLMIX and TSSIX have a correlation of 0.51, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TLMIX or TSSIX?

TSSIX has higher volatility (0.91%) compared to TLMIX (0.44%). In terms of maximum drawdown, TLMIX dropped -4.15% vs TSSIX's -12.64%.

Which has better risk-adjusted returns?

TLMIX currently has the higher Sharpe Ratio (2.80 vs 2.54), 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.