ZDB.TO vs. ZGB.TO

Last updated Jun 4, 2026

ZDB.TO (BMO Discount Bond) and ZGB.TO (BMO Government Bond Index ETF) are both Canadian Government Bonds funds from BMO - ZDB.TO tracks the FTSE Canada Universe Discount Bond Index while ZGB.TO tracks the FTSE Canada All Government Bond Index. Both are passively managed. Over the past 5 years, ZDB.TO returned 0.56%/yr vs 0.14%/yr for ZGB.TO. A 0.75 correlation means they provide meaningful diversification when combined. ZDB.TO charges 0.10%/yr vs 0.17%/yr for ZGB.TO.

Performance

ZDB.TO vs. ZGB.TO - Performance Comparison

The chart below illustrates the hypothetical performance of a CA$10,000 investment in BMO Discount Bond (ZDB.TO) and BMO Government Bond Index ETF (ZGB.TO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ZDB.TO achieves a 1.53% return, which is significantly lower than ZGB.TO's 1.62% return.

ZDB.TO

• 1D: -0.13%
• 1M: 1.48%
• YTD: 1.53%
• 6M: 0.70%
• 1Y: 2.71%
• 3Y*: 4.07%
• 5Y*: 0.56%
• 10Y*: 1.57%

ZGB.TO

• 1D: -0.07%
• 1M: 1.66%
• YTD: 1.62%
• 6M: 0.49%
• 1Y: 2.56%
• 3Y*: 3.45%
• 5Y*: 0.14%
• 10Y*: —

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

ZDB.TO vs. ZGB.TO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
ZDB.TO BMO Discount Bond	1.53%	2.03%	4.26%	6.69%	-11.99%	-2.77%	9.50%	6.74%	2.34%
ZGB.TO BMO Government Bond Index ETF	1.62%	1.54%	3.30%	5.92%	-12.38%	-2.74%	8.37%	5.42%	3.57%

Correlation

The correlation between ZDB.TO and ZGB.TO is 0.84, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.84
Correlation (3Y) Calculated over the trailing 3-year period	0.82
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (All Time) Calculated using the full available price history since Mar 8, 2018	0.75

The correlation between ZDB.TO and ZGB.TO has been stable across timeframes, ranging from 0.75 to 0.84 - a consistent structural relationship.

Return for Risk

ZDB.TO vs. ZGB.TO — Risk / Return Rank

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

ZDB.TO

ZDB.TO Risk / Return Rank: 19
ZDB.TO Sharpe Ratio Rank: 19
ZDB.TO Sortino Ratio Rank: 17
ZDB.TO Omega Ratio Rank: 18
ZDB.TO Calmar Ratio Rank: 22
ZDB.TO Martin Ratio Rank: 19

ZGB.TO

ZGB.TO Risk / Return Rank: 19
ZGB.TO Sharpe Ratio Rank: 19
ZGB.TO Sortino Ratio Rank: 17
ZGB.TO Omega Ratio Rank: 18
ZGB.TO Calmar Ratio Rank: 21
ZGB.TO Martin Ratio Rank: 19

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.

ZDB.TO vs. ZGB.TO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BMO Discount Bond (ZDB.TO) and BMO Government Bond Index ETF (ZGB.TO). 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.

	ZDB.TO	ZGB.TO	Difference
Sharpe ratio: Return per unit of total volatility	0.63	0.58	+0.05
Sortino ratio: Return per unit of downside risk	0.88	0.81	+0.07
Omega ratio: Gain probability vs. loss probability	1.11	1.11	0.00
Calmar ratio: Return relative to maximum drawdown	0.97	0.93	+0.04
Martin ratio: Return relative to average drawdown	2.23	1.97	+0.26
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ZDB.TO vs. ZGB.TO - Sharpe Ratio Comparison

The current ZDB.TO Sharpe Ratio is 0.63, which is comparable to the ZGB.TO Sharpe Ratio of 0.58. The chart below compares the historical Sharpe Ratios of ZDB.TO and ZGB.TO, 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

	ZDB.TO	ZGB.TO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.63	0.58	+0.05
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.09	0.02	+0.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.25	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.38	0.26	+0.13

Drawdowns

ZDB.TO vs. ZGB.TO - Drawdown Comparison

The maximum ZDB.TO drawdown since its inception was -18.09%, smaller than the maximum ZGB.TO drawdown of -19.31%. Use the drawdown chart below to compare losses from any high point for ZDB.TO and ZGB.TO.

Drawdown Indicators

	ZDB.TO	ZGB.TO	Difference
Max Drawdown Largest peak-to-trough decline	-18.09%	-19.31%	+1.22%
Max Drawdown (1Y) Largest decline over 1 year	-2.79%	-2.76%	-0.03%
Max Drawdown (3Y) Largest decline over 3 years	-5.07%	-5.86%	+0.79%
Max Drawdown (5Y) Largest decline over 5 years	-16.25%	-16.35%	+0.10%
Max Drawdown (10Y) Largest decline over 10 years	-18.09%	—	—
Current Drawdown Current decline from peak	-1.45%	-5.16%	+3.71%
Average Drawdown Average peak-to-trough decline	-4.21%	-6.98%	+2.77%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.22%	1.30%	-0.08%

Volatility

ZDB.TO vs. ZGB.TO - Volatility Comparison

The current volatility for BMO Discount Bond (ZDB.TO) is 1.55%, while BMO Government Bond Index ETF (ZGB.TO) has a volatility of 1.84%. This indicates that ZDB.TO experiences smaller price fluctuations and is considered to be less risky than ZGB.TO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ZDB.TO	ZGB.TO	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.55%	1.84%	-0.29%
Volatility (6M) Calculated over the trailing 6-month period	3.32%	3.53%	-0.21%
Volatility (1Y) Calculated over the trailing 1-year period	4.34%	4.42%	-0.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.52%	6.81%	-0.29%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.40%	6.15%	+0.25%

ZDB.TO vs. ZGB.TO - Expense Ratio Comparison

ZDB.TO has a 0.10% expense ratio, which is lower than ZGB.TO's 0.17% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

ZDB.TO vs. ZGB.TO - Dividend Comparison

ZDB.TO's dividend yield for the trailing twelve months is around 2.00%, less than ZGB.TO's 3.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ZDB.TO BMO Discount Bond	2.00%	2.28%	2.38%	2.42%	2.52%	2.16%	2.06%	2.20%	2.07%	2.06%	1.95%	1.99%
ZGB.TO BMO Government Bond Index ETF	3.04%	2.81%	2.69%	2.71%	2.76%	2.38%	2.26%	2.41%	2.58%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both ZDB.TO and ZGB.TO in my portfolio?

ZDB.TO and ZGB.TO have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, ZDB.TO or ZGB.TO?

On fees, ZDB.TO is cheaper at 0.10% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, ZDB.TO or ZGB.TO?

ZDB.TO is cheaper with a 0.10% expense ratio, compared with 0.17% for ZGB.TO.

What is the main difference between ZDB.TO and ZGB.TO?

ZDB.TO tracks FTSE Canada Universe Discount Bond Index, while ZGB.TO tracks FTSE Canada All Government Bond Index. Their fees differ too: 0.10% for ZDB.TO and 0.17% for ZGB.TO.