The trading of an interest rate swap lasts seconds. The management of it lasts years. Understanding the full lifecycle — from the moment a client calls to request a rate, through clearing, margin, coupon payments, and eventual termination — is essential for anyone working in or around a rates business.
Stage 1: Execution
A client — say, a UK corporate treasurer — calls the bank's rates desk to request a quote on a five-year GBP interest rate swap. She wants to pay fixed and receive SONIA (converting her floating-rate loan to a synthetic fixed obligation).
RFQ (Request for Quote): The salesperson picks up the call and immediately relays the request to the swap trader. The trader checks the current five-year SONIA swap rate on the interbank screen — say, 4.42% mid — adds a bid/offer spread (perhaps 0.50bp each side for a plain vanilla transaction) and quotes 4.415% / 4.425% (the client, paying fixed, receives the lower bid side: 4.415%). The XVA desk may also embed CVA, FVA, and MVA in the rate if the trade is bilateral (not cleared).
Voice broker or electronic: Many interbank swaps now trade electronically on SEFs (Swap Execution Facilities, mandated in the US after Dodd-Frank) or platforms like Tradeweb and Bloomberg. For corporate clients, voice execution via the bank's salesperson remains standard.
Deal capture: The moment the client agrees to terms ("done at 4.415%"), the trader enters the trade into the bank's front-office trading system. The trade details — notional (£100 million), fixed rate (4.415%), start date, maturity date, payment frequency (annual fixed, daily SONIA compounded), day count conventions — are captured and a trade ID is assigned.
Stage 2: Confirmation
Within minutes to hours, the trade passes to the Middle Office / Trade Support team. Their first job is to confirm the trade is correctly booked: does it match what the salesperson recorded, what the trader intended, and what the client agreed? Any discrepancies — wrong notional, wrong fixed rate, wrong tenor — must be caught and corrected before the trade is confirmed.
For cleared trades, confirmation is largely automated through the clearing house. For bilateral (uncleared) trades, an electronic confirmation is sent to the client via DTCC Deriv/SERV or similar platform, and the client's back office must affirm it. Both sides must agree on every economic term before the trade is "matched" and eligible for settlement processing.
Stage 3: Clearing at LCH SwapClear
For a standard plain vanilla GBP SONIA swap, clearing through LCH SwapClear is mandatory for most counterparty types in the UK and EU. Clearing works as follows:
The trade is submitted to LCH SwapClear (the largest interest rate swap CCP globally) by the bank's clearing member. LCH steps in as the central counterparty — it becomes the buyer to the bank's client and the seller to the bank. The original bilateral contract is replaced ("novated") by two contracts: the client vs LCH, and the bank vs LCH.
By interposing itself, LCH eliminates bilateral counterparty credit risk. If either party defaults, LCH manages the close-out using the defaulter's posted margin and, if necessary, its own default fund. This is the core purpose of central clearing.
Initial Margin (IM): At clearing, both the client (through their clearing broker) and the bank must post initial margin — a buffer calculated by LCH's SPAN or PAIRS margin model based on the potential future exposure of the position. For a £100 million five-year swap, initial margin might be £800,000–£1.5 million, depending on the rate environment.
Stage 4: Daily Variation Margin
Every business day for the life of the swap, the mark-to-market value of the position is recalculated. If rates have moved since the previous day, the swap's value has changed. LCH calculates the daily variation margin call: the party that has lost value must pay cash to the party that has gained value, via LCH as intermediary.
If rates rise by 5bp the day after the trade, the client (paying fixed at 4.415%) gains — because she locked in a lower fixed rate than the market now offers. The bank (the fixed receiver in the hedge it placed) loses. The bank pays variation margin to LCH; LCH passes it to the client's clearing account. This daily settlement process means that the swap's MTM exposure never accumulates beyond one day.
Stage 5: Coupon Payment Dates
At each annual payment date, the fixed leg and the floating leg are calculated and netted:
- Fixed leg payment: £100m × 4.415% × (365/365) = £4,415,000 (paid by the client to the bank)
- Floating leg payment: £100m × compounded SONIA over the year (calculated daily and compounded, published after the period ends)
If compounded SONIA over the year averaged 4.20%, the floating payment is £4,200,000. The net payment from the client to the bank is £215,000. If SONIA had averaged 4.60%, the bank would pay £185,000 net to the client.
Reset dates: For SONIA swaps (which compound daily), there is no formal "reset" — each business day's SONIA fixing is compounded into the cumulative rate. The final compounded rate for the period is only known at the end of the period, but the daily fixings are published by the Bank of England each morning.
Stage 6: Ongoing Risk Management
Throughout the life of the swap, the bank's trader and risk management systems monitor the position. The DV01 of the outstanding swap is aggregated with other positions in the book; macro hedges (typically using more liquid instruments like government bond futures or other swaps) are adjusted as the portfolio changes. P&L is attributed daily by tenor bucket and reported to management.
Stage 7: Termination or Novation
A swap terminates naturally on its maturity date, with the final coupon payment and settlement of any residual variation margin. However, swaps can also terminate early in two ways:
Early termination: The client may want to unwind the swap before maturity — for example, because the underlying loan has been refinanced. The bank calculates the current mark-to-market value of the swap and the client pays (or receives) that amount to exit. This MTM amount reflects the accumulated gain or loss on the position at the termination date.
Novation: The client may wish to transfer the swap to a new counterparty — for example, if they are refinancing their bank facilities. With the consent of all three parties, the original client is substituted by the new party: the old contract is terminated and a new, economically identical contract is created with the new counterparty. LCH manages novations for cleared swaps.