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Fixed Income is the topic that separates prepared CFA Level 1 candidates from unprepared ones. It carries 10–12% of the exam — enough to meaningfully swing a borderline result in either direction — yet in nearly every cohort, it is one of the weakest-performing topic areas. Candidates find it confusing, put off studying it, and then run out of time to cover it properly.

This guide is the resource I wish I had when I was preparing for Level 1. It covers every major sub-topic tested in Fixed Income, explains the concepts that trip candidates up most often, and gives you a clear framework for studying the area systematically. It is long — intentionally. Fixed Income deserves this level of attention.

Why Fixed Income Trips Up So Many Level 1 Candidates

Fixed Income at Level 1 introduces a set of interlocking concepts — bond pricing, yield measures, duration, convexity, and the term structure of interest rates — that build directly on each other. Candidates who skip ahead or rush through the early readings arrive at duration having no solid foundation, and the wheels come off.

The other challenge is that Fixed Income is mathematical. Not prohibitively so — you do not need to derive Black-Scholes — but the calculations require precision. Getting the compounding convention wrong, confusing nominal yield with effective yield, or mixing up modified duration and effective duration will cost you marks even when your conceptual understanding is correct.

Finally, Fixed Income at Level 1 introduces several concepts that will recur at Level 2 and 3. Candidates who build a solid foundation here will have a significant advantage in their later exams. This is not just an exam topic — it is foundational financial literacy for anyone working in investment management.

Sub-Topic 1: Basic Bond Features and Bond Markets

The first readings in Fixed Income cover the mechanics of bonds: face value (par value), coupon rate, maturity, and the relationship between coupon frequency and yield calculations. The exam regularly tests whether candidates understand the difference between an annual-coupon bond and a semi-annual coupon bond and how to adjust yield calculations accordingly.

Bond markets are also tested here: the primary market versus the secondary market, the different types of issuers (sovereign, corporate, municipal, supranational), and the basic mechanics of bond indentures. These are largely definitional and can be locked in with focused reading and a short set of practice questions.

Key exam trap: Eurobonds are not European bonds. A Eurobond is a bond issued in a currency other than the currency of the country where it is issued. This distinction appears regularly in exam questions and trips up unprepared candidates.

Sub-Topic 2: Bond Pricing Fundamentals

Bond pricing is where the mathematics begins. The price of a bond is the present value of its future cash flows — coupons and face value — discounted at the appropriate yield. This seems simple but the exam tests several variations:

• Pricing a bond with a yield given as a nominal (annual) rate versus an effective rate
• Pricing between coupon dates (accrued interest, full price versus clean price)
• The relationship between price and yield: when the coupon rate equals the yield, the bond prices at par; when the coupon rate is below the yield, the bond prices at a discount; when the coupon rate is above the yield, the bond prices at a premium

This par/discount/premium relationship is tested in almost every exam. Make sure you can reproduce the logic without a formula: if the bond's fixed coupon is less than the return the market demands (the yield), buyers will only purchase the bond at a discount to par to make up the difference in returns.

The calculation: Bond Price = ΣCoupon/(1+r)^t + FaceValue/(1+r)^n where r is the periodic yield and n is the number of periods. For a semi-annual coupon bond paying $30 every six months with a 5% annual yield: use r = 2.5% per period.

Sub-Topic 3: Yield Measures

This sub-topic is consistently one of the highest-error areas in Level 1 Fixed Income. Candidates confuse yield measures, apply the wrong one, or fail to understand what each measure actually represents.

The main yield measures you must know:

• Current yield: Annual coupon / Current price. Simple but limited — it ignores the time value of money and any capital gain or loss to maturity.
• Yield to maturity (YTM): The discount rate that equates the present value of all future cash flows to the current market price. This is the most widely used yield measure. For a bond priced at a discount, YTM > coupon rate. For a bond priced at a premium, YTM < coupon rate.
• Yield to call (YTC): Like YTM but assumes the bond is called at the earliest call date at the call price. Used for callable bonds when the bond is trading at a premium.
• Yield to worst (YTW): The lowest of YTM, YTC, and any other relevant yield measures. This is the standard quoted yield for callable bonds.

Bond equivalent yield (BEY) is another measure that regularly confuses candidates. BEY doubles the semi-annual yield to produce an annual figure — a convention used for comparing bonds with different coupon frequencies. An effective annual yield (EAY) compounds the semi-annual yield: EAY = (1 + semi-annual yield)^2 - 1. EAY will always be slightly higher than BEY for the same bond because it accounts for compounding.

Sub-Topic 4: Duration — The Most Important Concept in Fixed Income

Duration is, without question, the most important Fixed Income concept for the CFA exam across all three levels. Understanding it at Level 1 pays dividends all the way to Level 3.

Duration measures the sensitivity of a bond's price to changes in yield. There are several duration measures you must be able to distinguish:

• Macaulay Duration: The weighted average time to receive the bond's cash flows, measured in years. For a zero-coupon bond, Macaulay Duration equals the bond's maturity (because all cash flows come at maturity). For a coupon bond, Macaulay Duration is less than maturity.
• Modified Duration: Macaulay Duration / (1 + yield per period). This is the primary measure of interest rate risk. It tells you the approximate percentage change in price for a 1% (100 basis point) change in yield. Modified Duration = 5 means a 1% yield increase leads to approximately a 5% price decrease.
• Effective Duration: Used for bonds with embedded options (callable, putable) where cash flows change as yields change. You cannot use modified duration for these bonds because the assumption of fixed cash flows breaks down.

Key relationships every candidate must know: duration increases as maturity increases; duration decreases as coupon rate increases (higher coupons return cash earlier, reducing the weighted average time to receive them); duration decreases as yield increases.

The approximate price change formula: ΔP ≈ -Duration × ΔYield × P. This is the most tested calculation in Fixed Income. Know it precisely — including the negative sign, which reflects the inverse relationship between price and yield.

Sub-Topic 5: Convexity

Convexity is the second-order measure of interest rate risk — it captures the curvature of the price-yield relationship that duration (a linear approximation) misses. Duration works well for small yield changes but overstates price declines and understates price increases for large yield moves. Convexity corrects for this.

For the Level 1 exam, you need to understand convexity conceptually and know that the full price change approximation including convexity is:

ΔP ≈ (-Duration × ΔYield + ½ × Convexity × ΔYield²) × P

Positive convexity (standard for non-callable bonds) is desirable — the bond loses less than duration predicts when yields rise, and gains more than duration predicts when yields fall. Negative convexity, common in callable bonds, is the opposite — call options limit the price upside when rates fall. This is a frequent exam question.

Sub-Topic 6: Term Structure of Interest Rates

The yield curve describes the relationship between yield and maturity for bonds of the same credit quality. The Level 1 exam tests several aspects of the term structure:

• Shapes of the yield curve: Normal (upward sloping), inverted (downward sloping), flat, and humped. Each shape has conventional interpretations — an inverted yield curve is often associated with expectations of falling rates and is historically a recession indicator.
• Theories of the term structure: Pure expectations theory (long-term rates reflect expected future short-term rates with no premium), liquidity preference theory (investors demand a premium for longer maturities), and market segmentation theory (different investor groups operate in different maturity segments, with supply and demand determining rates at each maturity independently).
• Spot rates and forward rates: A spot rate is the yield on a zero-coupon bond maturing at a specific date. A forward rate is the implied yield on a future investment over a defined period. The relationship between them — bootstrapping spot rates from coupon bond yields, and extracting forward rates from spot rates — is tested in calculations at Level 1.

Sub-Topic 7: Credit Analysis and Spread Measures

Level 1 introduces credit risk and the spread measures used to quantify it. The key spread concepts:

• Yield spread: The difference between a corporate bond's yield and the yield of a benchmark government bond of similar maturity.
• G-spread: Yield spread over the relevant government bond yield.
• I-spread: Yield spread over the swap rate of the same maturity.
• Z-spread (zero-volatility spread): The constant spread added to every point on the spot rate curve that makes the present value of cash flows equal to the market price. More precise than the G-spread because it accounts for the shape of the yield curve.
• OAS (option-adjusted spread): The Z-spread adjusted to remove the value of any embedded option. For callable bonds, OAS < Z-spread because the call option has positive value to the issuer.

Credit ratings from agencies like Moody's and S&P Global Ratings are also covered — investment grade versus high yield, the rating scale, and the limitations of credit ratings as risk measures.

Sub-Topic 8: Asset-Backed Securities (ABS) and MBS

Structured products appear at the end of the Fixed Income topic and many candidates run out of time to cover them. This is a mistake — they carry testable marks and are conceptually interesting once you understand the basic structure.

A mortgage-backed security (MBS) pools mortgage loans and passes the cash flows through to investors. The complication is prepayment risk: when interest rates fall, homeowners refinance their mortgages, returning principal to MBS investors at exactly the wrong time (when reinvestment rates are lower). This is the key risk unique to MBS versus standard bonds — and it is consistently tested.

CMOs (collateralized mortgage obligations) create tranches with different prepayment exposures from the same pool of mortgages. PAC (planned amortization class) tranches have the most prepayment protection; support tranches absorb prepayment volatility and consequently carry the most prepayment risk.

A Suggested Study Sequence for Fixed Income

Based on concept dependencies, here is the order I recommend:

1. Bond features and bond markets (foundational vocabulary)
2. Bond pricing (the mathematics foundation)
3. Yield measures (builds directly on pricing)
4. Duration and convexity (the most important concepts)
5. Term structure of interest rates (builds on yield concepts)
6. Credit analysis and spreads (application of yield curve knowledge)
7. ABS and MBS (structured products — synthesises earlier concepts)

Do not attempt duration before you are comfortable with bond pricing and yield measures. The sequence matters.

For practice, prioritise questions that test calculations under the yield measures and duration sub-topics — these are where most candidates lose marks. Once you can get yield and duration calculations right consistently, the rest of Fixed Income falls into place much more naturally.

You can find Fixed Income heavily weighted in our Level 1 mock exams, with every wrong answer mapped to the exact sub-topic — bond pricing, duration, yield measures, term structure — so you know precisely where to direct your revision.

Bringing It Together

Fixed Income at Level 1 is learnable. It is mathematical but not beyond the capabilities of any candidate willing to engage with the calculations systematically. The candidates who struggle are usually those who try to memorise formulas without understanding the underlying logic — and then find they cannot apply the formula when the question is presented in an unfamiliar way.

Understand why bond prices fall when yields rise. Understand why duration is lower for higher-coupon bonds. Understand why MBS exhibit negative convexity. When you understand the logic, the formulas become intuitive rather than arbitrary — and you can derive them on the fly if memory fails you in the exam room.

Invest the time in Fixed Income. The marks are there for the taking.