Fixed Income Learning Path: Bonds, Yield, Duration, Credit and Funds

Direct answer

Build fixed-income knowledge from bond cash flows and price/yield relationships through duration, convexity, credit risk, bond funds and source verification.

Who this path is for

For investors and learners who want to understand bonds and fixed income without treating yield as a complete measure of return or risk.

What you should be able to do when you finish

Produce a sourced fixed-income comparison that separates rate risk, credit risk, liquidity, optionality, tax treatment and vehicle structure.

How to use the path

Work in order the first time. Each step has a purpose, a practice task, and a completion check. If you already know a topic, use the completion check rather than rereading material you can already apply. The path is educational: it teaches a research and decision process, not what to buy, sell, or hold.

Keep a research notebook as you work. Separate evidence from interpretation. When a step depends on a rule, current limit, market convention, provider methodology, or economic release, record the primary source and the date you verified it. That habit is part of the curriculum, not an administrative extra.

Learning sequence

Step 1: Read a bond as a cash-flow contract

Why this comes here: Coupon, maturity and principal are the foundation for every later bond calculation.

Identify issuer, par value, coupon rate, payment frequency, maturity, seniority and any embedded options. Separate promised cash flows from market value.

Practice: Write the scheduled cash flows for a simple fixed-rate bond.

Completion check: Explain which cash flows are contractual and which outcomes still depend on issuer credit.

Interlink targets: Bond Basics; Fixed Income hub.

Step 2: Understand price and yield

Why this comes here: Bond prices and market yields are linked inversely for ordinary fixed-rate bonds.

Learn current yield, yield to maturity and why YTM is an internal rate of return based on assumptions such as holding to maturity and receiving promised payments.

Practice: Use the Bond Price/YTM Calculator to change the market yield while holding the coupon and maturity constant.

Completion check: Explain why the price changes and why the magnitude depends on maturity and coupon.

Interlink targets: Bond Price/YTM Calculator; Yield to Maturity.

Step 3: Learn duration

Why this comes here: Duration converts rate sensitivity into a more useful first-order measure.

Distinguish Macaulay and modified duration at a practical level and learn the approximate price-change relationship for small yield moves.

Practice: Estimate the percentage price effect of a 1 percentage-point yield move for bonds with different modified durations.

Completion check: Explain why longer duration usually means greater interest-rate sensitivity.

Interlink targets: Duration; Interest-Rate Risk.

Step 4: Add convexity

Why this comes here: Duration is a linear approximation and becomes less accurate for larger yield changes.

Convexity captures curvature in the price-yield relationship. Use it as a refinement, not as an isolated score.

Practice: Compare a duration-only estimate with a duration-plus-convexity estimate in a hypothetical scenario.

Completion check: Explain what convexity adds without calling higher convexity universally better.

Interlink targets: Convexity; Bond Price Sensitivity.

Step 5: Separate credit risk from rate risk

Why this comes here: A bond can lose value because Treasury yields move, credit spreads widen, default risk rises, liquidity deteriorates or several occur together.

Learn ratings, spreads, seniority, covenants, recovery, issuer leverage and liquidity. For government securities, distinguish sovereign and inflation risks from corporate credit.

Practice: Build a risk map for a Treasury bond and a lower-rated corporate bond.

Completion check: Identify which risks are shared and which are different.

Interlink targets: Credit Risk; Credit Spreads; Treasury Securities.

Step 6: Understand bond funds and ETFs

Why this comes here: A bond fund does not mature like an individual bond.

Learn duration management, portfolio turnover, distributions, NAV, market price, tracking and liquidity. Do not import individual-bond expectations into a perpetual fund vehicle.

Practice: Compare an individual bond with a bond ETF that has a similar duration.

Completion check: Explain the difference between a bond maturity date and a fund’s rolling portfolio.

Interlink targets: Bond ETF Mechanics; ETF Investing.

Step 7: Use issuer and market sources

Why this comes here: Fixed income relies heavily on instrument terms and current market data.

For Treasuries use Treasury sources; for municipal securities use official disclosure systems such as EMMA where relevant; for corporate debt use issuer filings and offering documents; for rules use the appropriate regulator or market authority.

Practice: Locate an official source for one bond’s terms or one current market rule.

Completion check: Record the source, effective date and any limitations.

Interlink targets: Primary Financial Sources; Treasury; FINRA fixed-income data.

Step 8: Build a fixed-income comparison

Why this comes here: The final skill is matching cash-flow structure and risks rather than chasing the highest displayed yield.

Compare yield, duration, credit quality, seniority, callability, liquidity, tax treatment and reinvestment assumptions consistently.

Practice: Create a neutral comparison among three hypothetical bonds or bond funds.

Completion check: State what each metric tells you and what it does not.

Interlink targets: Fixed Income hub; comparison tools.

Capstone exercise

Build one artifact that proves you can use the sequence rather than simply recognize the vocabulary. Produce a sourced fixed-income comparison that separates rate risk, credit risk, liquidity, optionality, tax treatment and vehicle structure.

Your capstone should include the question you were trying to answer, the evidence you used, the assumptions you made, the limits of those assumptions, and the next piece of information that could change the conclusion. If the topic involves current rules or external data, include the source and verification date.

Do not grade the capstone by whether an investment later went up or down. Grade it by whether the reasoning was traceable, the evidence matched the question, and the risks or uncertainties were stated before the outcome was known.

Common failure modes

The first failure is jumping to the most interesting advanced topic before learning the mechanics that determine whether the result is meaningful. In fixed income learning path: bonds, yield, duration, credit and funds, this often creates sophisticated-looking conclusions built on misunderstood inputs.

The second failure is confusing a model with a fact. Calculators, scores, screens and scenarios summarize chosen inputs. They are valuable when the assumptions are visible and dangerous when the output is treated as certainty.

The third failure is using a secondary summary when a primary source directly establishes the rule, methodology, filing or data series. Secondary sources can add context; they should not erase provenance.

The fourth failure is treating completion as competence. Reading every page in a path does not matter if the learner cannot explain the concept, reproduce the calculation where relevant, or identify what evidence would falsify the conclusion.

Suggested next steps

After completing this path, continue with Bond Investing, ETF Investing, Portfolio Construction and Interest-Rate Risk. Use the Knowledge Center to follow prerequisites, comparison relationships, tools, and primary sources rather than relying only on a linear reading list.

Primary and authoritative sources

• U.S. Treasury
• FINRA fixed-income resources
• SEC filings and issuer offering documents
• MSRB EMMA where municipal securities are involved

Frequently asked questions

Applied lab 1: Test read a bond as a cash-flow contract with a controlled example

Use a hypothetical case rather than a security you already feel strongly about. The purpose is to isolate the skill in Read a bond as a cash-flow contract from the emotional pressure of reaching a preferred conclusion. Start by writing the question in one sentence, then list the facts you need before you calculate or interpret anything.

The reason this step belongs here is that coupon, maturity and principal are the foundation for every later bond calculation. Build the case so that one input can be changed while the others remain fixed. That makes the relationship visible instead of burying it inside a full portfolio or market narrative. If the exercise depends on current data or a rule, record the source, date, units and any adjustment policy before using the value.

Now perform the practice task: Write the scheduled cash flows for a simple fixed-rate bond. After you complete it, write a short evidence note with three headings: Observed, Calculated, and Interpreted. Anything sourced directly belongs under Observed. Arithmetic or deterministic transformation belongs under Calculated. Your explanation of why the result matters belongs under Interpreted.

The lab is complete when you can satisfy this check without reopening the lesson as a script: Explain which cash flows are contractual and which outcomes still depend on issuer credit. If you cannot, return to the prerequisite rather than adding another indicator or data point. Use these interlinks as the intended next context: Bond Basics; Fixed Income hub..

Applied lab 2: Build a before-and-after case for Understand price and yield

Create two versions of the same hypothetical situation. Keep the entity, time horizon and general context constant, then change the one assumption most relevant to Understand price and yield. This type of paired example is useful because it shows what the concept is sensitive to and what it leaves unchanged.

Learn current yield, yield to maturity and why YTM is an internal rate of return based on assumptions such as holding to maturity and receiving promised payments. Instead of summarizing that explanation, turn it into a small decision table. Column one is the input or condition. Column two is version A. Column three is version B. Column four is what changed in the output or interpretation. Add a final column called What did not change. That last column prevents the exercise from becoming a story in which every observation is attributed to one factor.

Carry out this practice: Use the Bond Price/YTM Calculator to change the market yield while holding the coupon and maturity constant. Then explain whether the difference is arithmetic, structural, regulatory, market-driven or judgmental. If the answer depends on an external methodology, filing or authority, link the exact source rather than relying on a secondary summary.

You have passed the lab when you can do the stated completion check: Explain why the price changes and why the magnitude depends on maturity and coupon. The related pages to use for prerequisite or follow-up work are Bond Price/YTM Calculator; Yield to Maturity..

Applied lab 3: Audit a bad interpretation of Learn duration

Write one plausible but incomplete claim a reader might make after learning Learn duration. The claim should sound reasonable enough that it could survive a quick read. Then audit it.

Begin with the underlying lesson: Distinguish Macaulay and modified duration at a practical level and learn the approximate price-change relationship for small yield moves. Ask which part of the bad claim is directly supported, which part adds an assumption, and which part turns description into prediction. If a number is involved, check its unit, period, source and whether it is observed or estimated. If a rule is involved, check jurisdiction and effective date.

Next, do the assigned practice: Estimate the percentage price effect of a 1 percentage-point yield move for bonds with different modified durations. Use the result to rewrite the bad claim into a narrower statement that the evidence actually supports. Add one sentence describing what new evidence would be needed to make a stronger claim.

The audit succeeds when this completion standard is met: Explain why longer duration usually means greater interest-rate sensitivity. Continue through Duration; Interest-Rate Risk. only after the corrected statement is clear enough that another reader could reproduce the reasoning.

Applied lab 4: Turn Add convexity into a reusable checklist

The goal of this lab is to convert Add convexity from something you recognize into something you can apply consistently. Start with the reason for the step: Duration is a linear approximation and becomes less accurate for larger yield changes. Then identify the smallest set of questions that would force you to verify the concept rather than rely on memory.

Use the explanation as the evidence base: Convexity captures curvature in the price-yield relationship. Use it as a refinement, not as an isolated score. Build a checklist with no more than seven items. Each item must be observable or answerable. Avoid vague prompts such as “consider risk.” Prefer prompts such as “record the effective date,” “identify the provider,” “calculate the concentration,” or “state the assumption used.”

Apply the checklist through this practice: Compare a duration-only estimate with a duration-plus-convexity estimate in a hypothetical scenario. Afterward, remove any checklist item that did not change the quality of the analysis. A short list used consistently is more valuable than a comprehensive list that becomes ceremonial.

You have completed the exercise when you can pass this check: Explain what convexity adds without calling higher convexity universally better. Save the checklist beside the resources in Convexity; Bond Price Sensitivity. so the process remains connected to its prerequisites and source material.

Applied lab 5: Test separate credit risk from rate risk with a controlled example

Use a hypothetical case rather than a security you already feel strongly about. The purpose is to isolate the skill in Separate credit risk from rate risk from the emotional pressure of reaching a preferred conclusion. Start by writing the question in one sentence, then list the facts you need before you calculate or interpret anything.

The reason this step belongs here is that a bond can lose value because treasury yields move, credit spreads widen, default risk rises, liquidity deteriorates or several occur together. Build the case so that one input can be changed while the others remain fixed. That makes the relationship visible instead of burying it inside a full portfolio or market narrative. If the exercise depends on current data or a rule, record the source, date, units and any adjustment policy before using the value.

Now perform the practice task: Build a risk map for a Treasury bond and a lower-rated corporate bond. After you complete it, write a short evidence note with three headings: Observed, Calculated, and Interpreted. Anything sourced directly belongs under Observed. Arithmetic or deterministic transformation belongs under Calculated. Your explanation of why the result matters belongs under Interpreted.

The lab is complete when you can satisfy this check without reopening the lesson as a script: Identify which risks are shared and which are different. If you cannot, return to the prerequisite rather than adding another indicator or data point. Use these interlinks as the intended next context: Credit Risk; Credit Spreads; Treasury Securities..

Applied lab 6: Build a before-and-after case for Understand bond funds and ETFs

Create two versions of the same hypothetical situation. Keep the entity, time horizon and general context constant, then change the one assumption most relevant to Understand bond funds and ETFs. This type of paired example is useful because it shows what the concept is sensitive to and what it leaves unchanged.

Learn duration management, portfolio turnover, distributions, NAV, market price, tracking and liquidity. Do not import individual-bond expectations into a perpetual fund vehicle. Instead of summarizing that explanation, turn it into a small decision table. Column one is the input or condition. Column two is version A. Column three is version B. Column four is what changed in the output or interpretation. Add a final column called What did not change. That last column prevents the exercise from becoming a story in which every observation is attributed to one factor.

Carry out this practice: Compare an individual bond with a bond ETF that has a similar duration. Then explain whether the difference is arithmetic, structural, regulatory, market-driven or judgmental. If the answer depends on an external methodology, filing or authority, link the exact source rather than relying on a secondary summary.

You have passed the lab when you can do the stated completion check: Explain the difference between a bond maturity date and a fund’s rolling portfolio. The related pages to use for prerequisite or follow-up work are Bond ETF Mechanics; ETF Investing..

Applied lab 7: Audit a bad interpretation of Use issuer and market sources

Write one plausible but incomplete claim a reader might make after learning Use issuer and market sources. The claim should sound reasonable enough that it could survive a quick read. Then audit it.

Begin with the underlying lesson: For Treasuries use Treasury sources; for municipal securities use official disclosure systems such as EMMA where relevant; for corporate debt use issuer filings and offering documents; for rules use the appropriate regulator or market authority. Ask which part of the bad claim is directly supported, which part adds an assumption, and which part turns description into prediction. If a number is involved, check its unit, period, source and whether it is observed or estimated. If a rule is involved, check jurisdiction and effective date.

Next, do the assigned practice: Locate an official source for one bond’s terms or one current market rule. Use the result to rewrite the bad claim into a narrower statement that the evidence actually supports. Add one sentence describing what new evidence would be needed to make a stronger claim.

The audit succeeds when this completion standard is met: Record the source, effective date and any limitations. Continue through Primary Financial Sources; Treasury; FINRA fixed-income data. only after the corrected statement is clear enough that another reader could reproduce the reasoning.

Applied lab 8: Turn Build a fixed-income comparison into a reusable checklist

The goal of this lab is to convert Build a fixed-income comparison from something you recognize into something you can apply consistently. Start with the reason for the step: The final skill is matching cash-flow structure and risks rather than chasing the highest displayed yield. Then identify the smallest set of questions that would force you to verify the concept rather than rely on memory.

Use the explanation as the evidence base: Compare yield, duration, credit quality, seniority, callability, liquidity, tax treatment and reinvestment assumptions consistently. Build a checklist with no more than seven items. Each item must be observable or answerable. Avoid vague prompts such as “consider risk.” Prefer prompts such as “record the effective date,” “identify the provider,” “calculate the concentration,” or “state the assumption used.”

Apply the checklist through this practice: Create a neutral comparison among three hypothetical bonds or bond funds. Afterward, remove any checklist item that did not change the quality of the analysis. A short list used consistently is more valuable than a comprehensive list that becomes ceremonial.

You have completed the exercise when you can pass this check: State what each metric tells you and what it does not. Save the checklist beside the resources in Fixed Income hub; comparison tools. so the process remains connected to its prerequisites and source material.