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<div class="section" id="the-interest-rate-swap-contract">
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<h1>The Interest Rate Swap Contract<a class="headerlink" href="#the-interest-rate-swap-contract" title="Permalink to this headline">¶</a></h1>
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<p>The Interest Rate Swap (IRS) Contract (source: IRS.kt, IRSUtils.kt, IRSExport.kt) is a bilateral contract to implement a
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vanilla fixed / floating same currency IRS.</p>
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<p>In general, an IRS allows two counterparties to modify their exposure from changes in the underlying interest rate. They
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are often used as a hedging instrument, convert a fixed rate loan to a floating rate loan, vice versa etc.</p>
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<p>The IRS contract exists over a period of time (normally measurable in years). It starts on its value date
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(although this is not the agreement date), and is considered to be no longer active after its maturity date. During that
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time, there is an exchange of cash flows which are calculated by looking at the economics of each leg. These are based
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upon an amount that is not actually exchanged but notionally used for the calculation (and is hence known as the notional
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amount), and a rate that is either fixed at the creation of the swap (for the fixed leg), or based upon a reference rate
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that is retrieved during the swap (for the floating leg). An example reference rate might be something such as ‘LIBOR 3M’.</p>
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<p>The fixed leg has its rate computed and set in advance, where as the floating leg has a fixing process whereas the rate
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for the next period is fixed with relation to a reference rate. Then, a calculation is performed such that the interest
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due over that period multiplied by the notional is paid (normally at the end of the period). If these two legs have the
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same payment date, then these flows can be offset against each other (in reality there are normally a number of these
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swaps that are live between two counterparties, so that further netting is performed at counterparty level).</p>
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<p>The fixed leg and floating leg do not have to have the same period frequency. In fact, conventional swaps do not have
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the same period.</p>
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<p>Currently, there is no notion of an actual payment or obligation being performed in the contract code we have written;
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it merely represents that the payment needs to be made.</p>
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<p>Consider the diagram below; the x-axis represents time and the y-axis the size of the leg payments (not to scale), from
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the view of the floating leg receiver / fixed leg payer. The enumerated documents represent the versions of the IRS as
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it progresses (note that, the first version exists before the value date), the dots on the “y=0” represent an interest
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rate value becoming available and then the curved arrow indicates to which period the fixing applies.</p>
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<img alt="_images/irs.png" src="_images/irs.png" />
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<p>Two days (by convention, although this can be modified), before the value date (ie the start of the swap) in the red
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period the reference rate is observed from an oracle and fixed in the instance at 1.1%. At the end of the accrual period,
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there is an obligation from the floating leg payer of 1.1% * notional amount * days in the accrual period / 360.
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(Also note that the result of “days in the accrual period / 360” is also known as the day count factor, although other
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conventions are allowed and will be supported). This amount is then paid at a determined time at the end of the accrual period.</p>
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<p>Again, two working days before the blue period, the rate is fixed (this time at 0.5% - however in reality, the rates
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would not be so significantly different), and the same calculation is performed to evaluate the payment that will be due
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at the end of this period.</p>
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<p>This process continues until the swap reaches maturity and the final payments are calculated.</p>
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<div class="section" id="creating-an-instance-and-lifecycle">
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<h2>Creating an instance and lifecycle<a class="headerlink" href="#creating-an-instance-and-lifecycle" title="Permalink to this headline">¶</a></h2>
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<p>There are two valid operations on an IRS. The first is to generate via the <code class="docutils literal"><span class="pre">Agree</span></code> command (signed by both parties)
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and the second (and repeated operation) is <code class="docutils literal"><span class="pre">Fix</span></code> to apply a rate fixing.
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To see the minimum dataset required for the creation of an IRS, refer to <code class="docutils literal"><span class="pre">IRSTests.kt</span></code> which has two examples in the
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function <code class="docutils literal"><span class="pre">IRSTests.createDummyIRS()</span></code>. Implicitly, when the agree function is called, the floating leg and fixed
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leg payment schedules are created (more details below) and can be queried.</p>
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<p>Once an IRS hase been agreed, then the the only valid operation is to apply a fixing on one of the entries in the
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<code class="docutils literal"><span class="pre">Calculation.floatingLegPaymentSchedule</span></code> map. Fixes do not have to be applied in order (although it does make most
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sense to do them so).</p>
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<p>Examples of applying fixings to rates can been seen in <code class="docutils literal"><span class="pre">IRSTests.generateIRSandFixSome()</span></code> which loops through the next
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fixing date of an IRS that is created with the above example function and then applies a fixing of 0.052% to each floating
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event.</p>
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<p>Currently, there are no matured, termination or dispute operations.</p>
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</div>
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<div class="section" id="technical-details">
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<h2>Technical Details<a class="headerlink" href="#technical-details" title="Permalink to this headline">¶</a></h2>
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<p>The contract itself comprises of 4 data state classes, <code class="docutils literal"><span class="pre">FixedLeg</span></code>, <code class="docutils literal"><span class="pre">FloatingLeg</span></code>, <code class="docutils literal"><span class="pre">Common</span></code> and <code class="docutils literal"><span class="pre">Calculation</span></code>.
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Recall that the platform model is strictly immutable. To further that, between states, the only class that is modified
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is the <code class="docutils literal"><span class="pre">Calculation</span></code> class.</p>
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<p>The <code class="docutils literal"><span class="pre">Common</span></code> data class contains all data that is general to the entire swap, e.g. data like trade identifier,
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valuation date, etc.</p>
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<p>The Fixed and Floating leg classes derive from a common base class <code class="docutils literal"><span class="pre">CommonLeg</span></code>. This is due to the simple reason that
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they share a lot of common fields.</p>
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<p>The <code class="docutils literal"><span class="pre">CommonLeg</span></code> class contains the notional amount, a payment frequency, the effective date (as well as an adjustment
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option), a termination date (and optional adjustment), the day count basis for day factor calculation, the payment delay
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and calendar for the payment as well as the accrual adjustment options.</p>
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<p>The <code class="docutils literal"><span class="pre">FixedLeg</span></code> contains all the details for the <code class="docutils literal"><span class="pre">CommonLeg</span></code> as well as payer details, the rate the leg is fixed at
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and the date roll convention (ie what to do if the calculated date lands on a bank holiday or weekend).</p>
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<p>The <code class="docutils literal"><span class="pre">FloatingLeg</span></code> contains all the details for the CommonLeg and payer details, roll convention, the fixing roll
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convention, which day of the month the reset is calculated, the frequency period of the fixing, the fixing calendar and
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the details for the reference index (source and tenor).</p>
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<p>The <code class="docutils literal"><span class="pre">Calculation</span></code> class contains an expression (that can be evaluated via the ledger using variables provided and also
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any members of the contract) and two schedules - a <code class="docutils literal"><span class="pre">floatingLegPaymentSchedule</span></code> and a <code class="docutils literal"><span class="pre">fixedLegPaymentSchedule</span></code>.
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The fixed leg schedule is obviously pre-ordained, however, during the lifetime of the swap, the floating leg schedule is
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regenerated upon each fixing being presented.</p>
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<p>For this reason, there are two helper functions on the floating leg. <code class="docutils literal"><span class="pre">Calculation.getFixing</span></code> returns the date of the
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earliest unset fixing, and <code class="docutils literal"><span class="pre">Calculation.applyFixing</span></code> returns a new Calculation object with the revised fixing in place.
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Note that both schedules are, for consistency, indexed by payment dates, but the fixing is (due to the convention of
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taking place two days previously) not going to be on that date.</p>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">Payment events in the <code class="docutils literal"><span class="pre">floatingLegPaymentSchedule</span></code> that start as a <code class="docutils literal"><span class="pre">FloatingRatePaymentEvent</span></code> (which is a
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representation of a payment for a rate that has not yet been finalised) are replaced in their entirety with an
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equivalent <code class="docutils literal"><span class="pre">FixedRatePaymentEvent</span></code> (which is the same type that is on the <code class="docutils literal"><span class="pre">FixedLeg</span></code>).</p>
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