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Business helpers provide common calculations for invoices, receipts, and financial documents.

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calculateTax

Calculates tax amount based on a tax rate percentage. 
{{calculateTax amount taxRate}}
ArgumentTypeDescription
amountnumberBase amount
taxRatenumberTax rate as percentage (e.g., 8.5 for 8.5%)
Examples: 
{{calculateTax 100 8.5}}
Output: 8.50 
<p>Subtotal: {{currency subtotal "USD"}}</p>
<p>Tax ({{taxRate}}%): {{currency (calculateTax subtotal taxRate) "USD"}}</p>

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calculateDiscount

Calculates discount amount based on a discount percentage. 
{{calculateDiscount amount discountPercent}}
ArgumentTypeDescription
amountnumberOriginal amount
discountPercentnumberDiscount as percentage (e.g., 20 for 20%)
Examples: 
{{calculateDiscount 100 20}}
Output: 20.00 
<p>Original: {{currency originalPrice "USD"}}</p>
<p>Discount ({{discountPercent}}%): -{{currency (calculateDiscount originalPrice discountPercent) "USD"}}</p>
<p>Final: {{currency (subtract originalPrice (calculateDiscount originalPrice discountPercent)) "USD"}}</p>

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netAmount

Calculates net amount after tax and discount. 
{{netAmount amount taxRate discountPercent}}
ArgumentTypeDefaultDescription
amountnumberrequiredOriginal amount
taxRatenumber0Tax rate percentage
discountPercentnumber0Discount percentage
Calculation: (amount - discount) + tax on discounted amount Examples: 
{{netAmount 100 10 20}}
Calculation:
  • Original: $100
  • Discount (20%): -$20
  • Subtotal: $80
  • Tax (10% of 80):+80): +8
  • Net: $88.00
<p>Grand Total: {{currency (netAmount subtotal taxRate discountPercent) "USD"}}</p>

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invoiceNumber

Generates a formatted invoice number. 
{{invoiceNumber}}
{{invoiceNumber "INV" 42 6}}
ArgumentTypeDefaultDescription
prefixstring”INV”Prefix for the invoice
numbernumber1Sequential number
padLengthnumber6Padding length for number
Format: PREFIX-YYYYMM-NUMBER Examples: 
{{invoiceNumber}}
Output: INV-202412-000001 
{{invoiceNumber "INV" 42 6}}
Output: INV-202412-000042 
{{invoiceNumber "REC" 1234 8}}
Output: REC-202412-00001234 
{{invoiceNumber "PO" orderNumber 5}}

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dueDate

Calculates a due date by adding days to an invoice date. 
{{dueDate invoiceDate 30}}
ArgumentTypeDefaultDescription
invoiceDatestring/DatenowStarting date
termsnumber30Days until due
Examples: 
{{dueDate "2024-12-15" 30}}
Output: 2025-01-14 
<p>Invoice Date: {{formatDate invoiceDate "MMM D, YYYY"}}</p>
<p>Payment Terms: Net {{paymentTerms}}</p>
<p>Due Date: {{formatDate (dueDate invoiceDate paymentTerms) "MMM D, YYYY"}}</p>

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Practical Examples

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Complete Invoice Calculations

<div class="invoice">
  <table class="line-items">
    <thead>
      <tr>
        <th>Description</th>
        <th>Qty</th>
        <th>Unit Price</th>
        <th>Amount</th>
      </tr>
    </thead>
    <tbody>
      {{#each items}}
      <tr>
        <td>{{this.description}}</td>
        <td>{{this.quantity}}</td>
        <td>{{currency this.unitPrice "USD"}}</td>
        <td>{{currency (multiply this.quantity this.unitPrice) "USD"}}</td>
      </tr>
      {{/each}}
    </tbody>
  </table>

  <div class="totals">
    <div class="row">
      <span>Subtotal:</span>
      <span>{{currency subtotal "USD"}}</span>
    </div>
    
    {{#if discountPercent}}
    <div class="row discount">
      <span>Discount ({{discountPercent}}%):</span>
      <span>-{{currency (calculateDiscount subtotal discountPercent) "USD"}}</span>
    </div>
    {{/if}}
    
    <div class="row">
      <span>Tax ({{taxRate}}%):</span>
      <span>{{currency (calculateTax (subtract subtotal (calculateDiscount subtotal discountPercent)) taxRate) "USD"}}</span>
    </div>
    
    <div class="row grand-total">
      <span>Total:</span>
      <span>{{currency (netAmount subtotal taxRate discountPercent) "USD"}}</span>
    </div>
  </div>
</div>

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Invoice Header with Auto-Generated Number

<div class="invoice-header">
  <div class="company-info">
    <h1>{{company.name}}</h1>
    <p>{{company.address}}</p>
  </div>
  
  <div class="invoice-info">
    <h2>INVOICE</h2>
    <table>
      <tr>
        <td>Invoice #:</td>
        <td>{{invoiceNumber "INV" invoiceSequence 6}}</td>
      </tr>
      <tr>
        <td>Date:</td>
        <td>{{formatDate invoiceDate "MMMM D, YYYY"}}</td>
      </tr>
      <tr>
        <td>Due Date:</td>
        <td>{{formatDate (dueDate invoiceDate paymentTerms) "MMMM D, YYYY"}}</td>
      </tr>
    </table>
  </div>
</div>

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Payment Terms Section

<div class="payment-terms">
  <h3>Payment Terms</h3>
  <p>Payment is due within {{paymentTerms}} days of invoice date.</p>
  <p>
    <strong>Invoice Date:</strong> {{formatDate invoiceDate "MMM D, YYYY"}}<br>
    <strong>Due Date:</strong> {{formatDate (dueDate invoiceDate paymentTerms) "MMM D, YYYY"}}
  </p>
  
  {{#if (gt (daysBetween (dueDate invoiceDate paymentTerms)) 0)}}
    <p class="overdue-warning">
      This invoice is {{daysBetween (dueDate invoiceDate paymentTerms)}} days overdue.
    </p>
  {{/if}}
</div>

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Receipt with Discount

<div class="receipt">
  <h1>Receipt</h1>
  <p>Receipt #: {{invoiceNumber "REC" receiptNumber 8}}</p>
  <p>Date: {{formatDate transactionDate "MMM D, YYYY"}}</p>
  
  <hr>
  
  {{#each items}}
  <div class="line">
    <span>{{this.name}}</span>
    <span>{{currency this.price "USD"}}</span>
  </div>
  {{/each}}
  
  <hr>
  
  <div class="line">
    <span>Subtotal</span>
    <span>{{currency subtotal "USD"}}</span>
  </div>
  
  {{#if promoCode}}
  <div class="line discount">
    <span>Promo ({{promoCode}} - {{discountPercent}}%)</span>
    <span>-{{currency (calculateDiscount subtotal discountPercent) "USD"}}</span>
  </div>
  {{/if}}
  
  <div class="line">
    <span>Tax</span>
    <span>{{currency tax "USD"}}</span>
  </div>
  
  <div class="line total">
    <span>Total</span>
    <span>{{currency total "USD"}}</span>
  </div>
  
  <div class="line paid">
    <span>Paid</span>
    <span>{{currency total "USD"}}</span>
  </div>
</div>