ACCA AFM December 2026: The Interest Rate Swap Saving Is Not What You Think
The swap saving is not the gap between the two fixed rates. It is the gap between the two gaps. Share that net benefit between the parties and you have the AFM interest rate swap answer.
Where AFM candidates lose the marks
Interest rate swaps sit in the AFM treasury and risk management section, and the question pattern barely changes. Two companies, a fixed rate and a floating rate each, and a request to design a swap that benefits both. The marks sit in three places: spotting the comparative advantage, calculating the total net benefit, and showing each party's resulting rate.
Candidates who go wrong usually do so at the very first step. They compare the two companies' fixed rates, call the difference the saving, and then split that figure. It feels logical. It is also wrong, because it ignores what each company gives up on the floating side.
The second common slip is a reversed direction of payment. The student works out the benefit correctly, then has the wrong company paying floating to the other. Always finish by checking each company ends up with the type of debt it actually wanted.
The third is stopping at the saving. The requirement almost always says "show the effective rate each company pays". A saving of 0.25% with no final rate leaves marks on the table.
Worked example: wrong vs right
Company X can borrow fixed at 5.0% or floating at base + 0.5%. Company Y can borrow fixed at 6.5% or floating at base + 1.5%. X wants floating debt. Y wants fixed. A swap is arranged and the benefit is shared equally.
Wrong answer: "Fixed differential is 1.5%, so total saving is 1.5%, and each company saves 0.75%." This overstates the benefit by three times.
Correct answer:
Fixed differential: 6.5% − 5.0% = 1.5%.
Floating differential: 1.5% − 0.5% = 1.0%.
Total net benefit: 1.5% − 1.0% = 0.5%, so 0.25% each.
X has the comparative advantage in fixed, so X borrows fixed at 5.0%, and Y borrows floating at base + 1.5%. After the swap, X pays base + 0.25% (against base + 0.5% directly) and Y pays 6.25% (against 6.5% directly). Each saves 0.25%, which adds up to the 0.5% total.
Check it: Y pays X a fixed 5.0%, covering X's loan interest. X pays Y floating at base + 0.25%. Y's net cost is 5.0% + 1.5% − 0.25% = 6.25%. It reconciles. If it does not, you have a sign error.
What to do
1. Always run the two-gap method. Write the fixed differential, the floating differential and subtract. Do it before anything else. Whoever has the larger differential on one side holds the comparative advantage on that side.
2. Finish with each party's final rate and prove it. State the swap payments, then show X's net cost and Y's net cost as separate lines. Confirm the two savings add to the total net benefit.
3. Mention the caveats in the discussion part. Counterparty risk, basis risk and the fact that the swap is a separate contract from the underlying loans are all short, creditable points. Do not write a paragraph on what a swap is. They know.
The numbers
AFM pass rates have typically sat around the 40% mark, which means a technique-based topic like swaps is where well-prepared candidates pull ahead. It is a short, mechanical calculation and one of the cleaner sets of marks on the paper.
Two gaps, one subtraction, one final rate each. That is the whole question.