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Fix Tax Summary double counting tax on partially paid invoices

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johnnyq
2026-09-03 13:12:31 -04:00
parent feae4719da
commit a0fe18fff1
2 changed files with 26 additions and 15 deletions
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33
functions/app.php
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@@ -644,12 +644,20 @@ function checkForUpdates() {
}
function getMonthlyTax($tax_name, $month, $year, $mysqli) {
// SQL to calculate monthly tax
$sql = "SELECT SUM(item_tax) AS monthly_tax FROM invoice_items
LEFT JOIN invoices ON invoice_items.item_invoice_id = invoices.invoice_id
LEFT JOIN payments ON invoices.invoice_id = payments.payment_invoice_id
// Cash basis - tax is booked to the month the money arrived, in proportion to
// how much of the invoice that payment covered. Driving off payments (rather
// than invoice_items) counts each payment exactly once, and pre-aggregating
// the line items stops a multi-payment invoice multiplying its own tax.
$sql = "SELECT SUM(invoice_tax.tax_total * (payments.payment_amount / invoices.invoice_amount)) AS monthly_tax
FROM payments
INNER JOIN invoices ON invoices.invoice_id = payments.payment_invoice_id
INNER JOIN (SELECT item_invoice_id, SUM(item_tax) AS tax_total
FROM invoice_items
WHERE item_tax_id = (SELECT tax_id FROM taxes WHERE tax_name = '$tax_name')
GROUP BY item_invoice_id) AS invoice_tax
ON invoice_tax.item_invoice_id = invoices.invoice_id
WHERE YEAR(payments.payment_date) = $year AND MONTH(payments.payment_date) = $month
AND invoice_items.item_tax_id = (SELECT tax_id FROM taxes WHERE tax_name = '$tax_name')";
AND invoices.invoice_amount > 0";
$result = mysqli_query($mysqli, $sql);
$row = mysqli_fetch_assoc($result);
return $row['monthly_tax'] ?? 0;
@@ -660,12 +668,17 @@ function getQuarterlyTax($tax_name, $quarter, $year, $mysqli) {
$start_month = ($quarter - 1) * 3 + 1;
$end_month = $start_month + 2;
// SQL to calculate quarterly tax
$sql = "SELECT SUM(item_tax) AS quarterly_tax FROM invoice_items
LEFT JOIN invoices ON invoice_items.item_invoice_id = invoices.invoice_id
LEFT JOIN payments ON invoices.invoice_id = payments.payment_invoice_id
// SQL to calculate quarterly tax - see getMonthlyTax for why it is shaped this way
$sql = "SELECT SUM(invoice_tax.tax_total * (payments.payment_amount / invoices.invoice_amount)) AS quarterly_tax
FROM payments
INNER JOIN invoices ON invoices.invoice_id = payments.payment_invoice_id
INNER JOIN (SELECT item_invoice_id, SUM(item_tax) AS tax_total
FROM invoice_items
WHERE item_tax_id = (SELECT tax_id FROM taxes WHERE tax_name = '$tax_name')
GROUP BY item_invoice_id) AS invoice_tax
ON invoice_tax.item_invoice_id = invoices.invoice_id
WHERE YEAR(payments.payment_date) = $year AND MONTH(payments.payment_date) BETWEEN $start_month AND $end_month
AND invoice_items.item_tax_id = (SELECT tax_id FROM taxes WHERE tax_name = '$tax_name')";
AND invoices.invoice_amount > 0";
$result = mysqli_query($mysqli, $sql);
$row = mysqli_fetch_assoc($result);
return $row['quarterly_tax'] ?? 0;