diff --git a/services/web/scripts/recurly/check_upcoming_schedules.mjs b/services/web/scripts/recurly/check_upcoming_schedules.mjs
new file mode 100644
index 0000000000..1e014cc900
--- /dev/null
+++ b/services/web/scripts/recurly/check_upcoming_schedules.mjs
@@ -0,0 +1,439 @@
+#!/usr/bin/env node
+
+// @ts-check
+
+/**
+ * This script checks upcoming schedules for existing Recurly subscriptions.
+ *
+ * Usage:
+ *   node scripts/recurly/check_upcoming_schedules.mjs [OPTS] [INPUT-FILE]
+ *
+ * Options:
+ *   --output PATH          Output file path (default: /tmp/check_schedules_output_<timestamp>.csv)
+ *                          Use '-' to write to stdout
+ *   --throttle DURATION    Minimum time (in ms) between subscriptions processed (default: 2400)
+ *   --help                 Show a help message
+ *
+ * CSV Input Format:
+ *   The CSV must have the following columns:
+ *   - subscription_uuid: Recurly subscription UUID
+ *   - plan_code: Current plan code
+ *   - currency: Current currency
+ *   - unit_amount: Current price per unit
+ *   - new_unit_amount: New price per unit
+ *   - subscription_add_on_unit_amount_in_cents: Current additional-licenses add-on price (optional)
+ *   - new_subscription_add_on_unit_amount_in_cents: New additional-licenses add-on price (optional)
+ *   - user_id: Overleaf user ID
+ *
+ * Output:
+ *   Writes a CSV with columns:
+ *   - subscription_uuid: The subscription UUID processed
+ *   - status: Result status (validated, not-found, inactive, mismatch, no-pending-change, or error)
+ *   - note: Additional information about the status
+ *   - user_id: Overleaf user ID
+ *
+ * Running on a Pod:
+ *   This script may run for a long time. When running using `rake run:longpod[ENV,web]`,
+ *   use one of these strategies to preserve output:
+ *
+ *   1. Tail the output file from another session (the filename is logged when the script starts):
+ *      kubectl exec -it <pod-name> -- tail -f /tmp/check_schedules_output_<timestamp>.csv > local_backup.csv
+ *
+ *   2. Periodically copy the output file to your laptop:
+ *      kubectl cp <pod-name>:/tmp/check_schedules_output_<timestamp>.csv ./backup.csv
+ *
+ *   3. Write to stdout and capture locally:
+ *      kubectl exec -it <pod-name> -- node scripts/recurly/check_upcoming_schedules.mjs \
+ *        --output - input.csv > output.csv
+ *
+ *   For monitoring handoffs, have the next person start tailing (or copying periodically)
+ *   before the current monitor disconnects to ensure no records are lost.
+ */
+
+import fs from 'node:fs'
+import path from 'node:path'
+import { setTimeout } from 'node:timers/promises'
+import * as csv from 'csv'
+import minimist from 'minimist'
+import recurly from 'recurly'
+import Settings from '@overleaf/settings'
+import { z } from '../../app/src/infrastructure/Validation.mjs'
+import { scriptRunner } from '../lib/ScriptRunner.mjs'
+
+/**
+ * @import { ReadStream } from 'node:fs'
+ * @import { Parser } from 'csv-parse'
+ * @import { Stringifier } from 'csv-stringify'
+ * @import { Subscription } from 'recurly'
+ */
+
+/**
+ * @typedef {Object} CSVSubscriptionChange
+ * @property {string} subscription_uuid
+ * @property {string} plan_code
+ * @property {string} currency
+ * @property {number} unit_amount
+ * @property {number} new_unit_amount
+ * @property {number | null} subscription_add_on_unit_amount_in_cents
+ * @property {number | null} new_subscription_add_on_unit_amount_in_cents
+ * @property {string} user_id
+ */
+
+const recurlyClient = new recurly.Client(Settings.apis.recurly.apiKey)
+
+// 2400 ms corresponds to approx. 3000 API calls per hour
+const DEFAULT_THROTTLE = 2400
+
+/**
+ * Print usage information to stderr
+ */
+function usage() {
+  console.error(`Usage: node scripts/recurly/check_upcoming_schedules.mjs [OPTS] [INPUT-FILE]
+
+Options:
+    --output PATH          Output file path (default: /tmp/check_schedules_output_<timestamp>.csv)
+                           Use '-' to write to stdout
+    --throttle DURATION    Minimum time between requests in ms (default: ${DEFAULT_THROTTLE})
+    --help                 Show this help message
+
+See the source file header for detailed documentation on CSV format and pod usage.
+`)
+}
+
+/**
+ * Main script entry point
+ * @param {function(string): Promise<void>} trackProgress - Function to log progress messages
+ */
+async function main(trackProgress) {
+  const opts = parseArgs()
+  const timestamp = new Date().toISOString().replace(/[:.]/g, '-')
+  const outputFile =
+    opts.output ?? `/tmp/check_schedules_output_${timestamp}.csv`
+
+  await trackProgress('Starting schedule check script for Recurly')
+  await trackProgress(`Throttle: ${opts.throttle}ms between requests`)
+
+  const inputStream = opts.inputFile
+    ? fs.createReadStream(opts.inputFile)
+    : process.stdin
+  const csvReader = getCsvReader(inputStream)
+  const csvWriter = getCsvWriter(outputFile)
+
+  await trackProgress(`Output: ${outputFile === '-' ? 'stdout' : outputFile}`)
+
+  let processedCount = 0
+  let successCount = 0
+  let errorCount = 0
+
+  let lastLoopTimestamp = 0
+  for await (const change of csvReader) {
+    const timeSinceLastLoop = Date.now() - lastLoopTimestamp
+    if (timeSinceLastLoop < opts.throttle) {
+      await setTimeout(opts.throttle - timeSinceLastLoop)
+    }
+    lastLoopTimestamp = Date.now()
+
+    processedCount++
+
+    try {
+      const subscription = await fetchSubscription(change.subscription_uuid)
+      validateChange(change, subscription)
+
+      csvWriter.write({
+        subscription_uuid: change.subscription_uuid,
+        status: 'validated',
+        note: 'everything looks as expected',
+        user_id: change.user_id,
+      })
+      successCount++
+
+      if (processedCount % 10 === 0) {
+        await trackProgress(
+          `Processed ${processedCount} subscriptions (${successCount}, ${errorCount} errors)`
+        )
+      }
+    } catch (err) {
+      errorCount++
+      if (err instanceof ReportError) {
+        csvWriter.write({
+          subscription_uuid: change.subscription_uuid,
+          status: err.status,
+          note: err.message,
+          user_id: change.user_id,
+        })
+      } else if (err instanceof Error) {
+        csvWriter.write({
+          subscription_uuid: change.subscription_uuid,
+          status: 'error',
+          note: err.message,
+          user_id: change.user_id,
+        })
+        await trackProgress(
+          `Error processing ${change.subscription_uuid}: ${err.message}`
+        )
+      }
+    }
+  }
+
+  await trackProgress('\n✨ FINAL SUMMARY ✨')
+  await trackProgress(`📊 Total processed: ${processedCount}`)
+  await trackProgress(`✅ Successfully validated: ${successCount}`)
+  await trackProgress(`❌ Errors: ${errorCount}`)
+  await trackProgress('🎉 Script completed!')
+
+  csvWriter.end()
+}
+
+/**
+ * Get a CSV parser configured for subscription change input
+ * @param {ReadStream | NodeJS.ReadableStream} inputStream - The input stream to parse
+ * @returns {Parser} The configured CSV parser
+ */
+function getCsvReader(inputStream) {
+  const parser = csv.parse({
+    columns: true,
+    cast: (value, context) => {
+      if (context.header) {
+        return value
+      }
+      switch (context.column) {
+        case 'unit_amount':
+        case 'new_unit_amount': {
+          const parsed = parseFloat(value)
+          if (Number.isNaN(parsed)) {
+            throw new ReportError(
+              'mismatch',
+              `Invalid number for ${context.column} at row ${context.lines}: "${value}"`
+            )
+          }
+          return parsed
+        }
+        case 'subscription_add_on_unit_amount_in_cents':
+        case 'new_subscription_add_on_unit_amount_in_cents': {
+          if (value === '') {
+            return null
+          }
+          const parsed = parseInt(value, 10)
+          if (Number.isNaN(parsed)) {
+            throw new ReportError(
+              'mismatch',
+              `Invalid number for ${context.column} at row ${context.lines}: "${value}"`
+            )
+          }
+          return parsed
+        }
+        default:
+          return value
+      }
+    },
+  })
+  inputStream.pipe(parser)
+  return parser
+}
+
+/**
+ * Get a CSV stringifier configured for output
+ * @param {string} outputFile - The output file path to write to, or '-' for stdout
+ * @returns {Stringifier} The configured CSV stringifier
+ */
+function getCsvWriter(outputFile) {
+  let outputStream
+  if (outputFile === '-') {
+    outputStream = process.stdout
+  } else {
+    fs.mkdirSync(path.dirname(outputFile), { recursive: true })
+    outputStream = fs.createWriteStream(outputFile)
+  }
+  const writer = csv.stringify({
+    columns: ['subscription_uuid', 'status', 'note', 'user_id'],
+    header: true,
+  })
+  writer.on('error', err => {
+    console.error(err)
+    process.exit(1)
+  })
+  writer.pipe(outputStream)
+  return writer
+}
+
+/**
+ * Fetch a subscription from Recurly
+ * @param {string} uuid - The Recurly subscription UUID
+ * @returns {Promise<Subscription>} The subscription
+ * @throws {ReportError} If subscription is not found
+ */
+async function fetchSubscription(uuid) {
+  try {
+    const subscription = await recurlyClient.getSubscription(`uuid-${uuid}`)
+    return subscription
+  } catch (err) {
+    if (err instanceof recurly.errors.NotFoundError) {
+      throw new ReportError('not-found', 'subscription not found')
+    } else {
+      throw err
+    }
+  }
+}
+
+/**
+ * Validate that the subscription matches the expected state
+ * @param {CSVSubscriptionChange} change - The subscription change to validate
+ * @param {Subscription} subscription - The Recurly subscription
+ * @throws {ReportError} If validation fails
+ */
+function validateChange(change, subscription) {
+  if (subscription.state !== 'active') {
+    throw new ReportError(
+      'inactive',
+      `subscription state: ${subscription.state}`
+    )
+  }
+
+  if (subscription.plan?.code !== change.plan_code) {
+    throw new ReportError(
+      'mismatch',
+      `subscription plan (${subscription.plan?.code}) does not match expected plan (${change.plan_code})`
+    )
+  }
+
+  if (subscription.currency !== change.currency) {
+    throw new ReportError(
+      'mismatch',
+      `subscription currency (${subscription.currency}) does not match expected currency (${change.currency})`
+    )
+  }
+
+  if (
+    !subscription.unitAmount ||
+    Math.abs(subscription.unitAmount - change.unit_amount) > 0.01
+  ) {
+    throw new ReportError(
+      'mismatch',
+      `subscription price (${subscription.unitAmount}) does not match expected price (${change.unit_amount})`
+    )
+  }
+
+  if (Math.abs(change.unit_amount - change.new_unit_amount) < 0.01) {
+    throw new ReportError(
+      'mismatch',
+      `price not expected to change (before: ${change.unit_amount}, after: ${change.new_unit_amount})`
+    )
+  }
+
+  if (!subscription.pendingChange) {
+    throw new ReportError(
+      'no-pending-change',
+      'subscription has no pending change'
+    )
+  }
+
+  if (
+    !subscription.pendingChange.unitAmount ||
+    Math.abs(subscription.pendingChange.unitAmount - change.new_unit_amount) >
+      0.01
+  ) {
+    throw new ReportError(
+      'mismatch',
+      `subscription price (${subscription.pendingChange.unitAmount}) does not match expected price (${change.new_unit_amount})`
+    )
+  }
+
+  const additionalLicenseAddOn = subscription.addOns?.find(
+    addOnItem => addOnItem.addOn?.code === 'additional-license'
+  )
+
+  if (change.subscription_add_on_unit_amount_in_cents != null) {
+    if (!additionalLicenseAddOn) {
+      throw new ReportError(
+        'mismatch',
+        'add-on for additional-license not found'
+      )
+    }
+    const expectedAddOnPrice =
+      change.subscription_add_on_unit_amount_in_cents / 100
+    if (
+      !additionalLicenseAddOn.unitAmount ||
+      Math.abs(additionalLicenseAddOn.unitAmount - expectedAddOnPrice) > 0.01
+    ) {
+      throw new ReportError(
+        'mismatch',
+        `add-on price (${additionalLicenseAddOn.unitAmount}) does not match expected price (${expectedAddOnPrice})`
+      )
+    }
+    if (change.new_subscription_add_on_unit_amount_in_cents == null) {
+      throw new ReportError(
+        'mismatch',
+        'new_subscription_add_on_unit_amount_in_cents is required when subscription_add_on_unit_amount_in_cents is provided'
+      )
+    }
+  } else if (additionalLicenseAddOn) {
+    throw new ReportError(
+      'mismatch',
+      'subscription has additional-license add-on but subscription_add_on_unit_amount_in_cents not provided in CSV'
+    )
+  }
+}
+
+const paramsSchema = z.object({
+  output: z.string().optional(),
+  throttle: z
+    .string()
+    .optional()
+    .transform(val => (val ? parseInt(val, 10) : DEFAULT_THROTTLE)),
+  _: z.array(z.string()).max(1),
+  help: z.boolean().optional(),
+})
+
+/**
+ * Parse command line arguments
+ * @returns {{inputFile: string | undefined, output: string | undefined, throttle: number}} Parsed options
+ */
+function parseArgs() {
+  const argv = minimist(process.argv.slice(2), {
+    string: ['throttle', 'output'],
+    boolean: ['help'],
+  })
+
+  if (argv.help) {
+    usage()
+    process.exit(0)
+  }
+
+  const parseResult = paramsSchema.safeParse(argv)
+
+  if (!parseResult.success) {
+    console.error(`Invalid parameters: ${parseResult.error.message}`)
+    usage()
+    process.exit(1)
+  }
+
+  const { output, throttle, _ } = parseResult.data
+
+  return {
+    inputFile: _[0],
+    output,
+    throttle,
+  }
+}
+
+/**
+ * Custom error class for reportable errors that should be written to CSV output
+ */
+class ReportError extends Error {
+  /**
+   * @param {string} status - The error status code for CSV output
+   * @param {string} message - The error message
+   */
+  constructor(status, message) {
+    super(message)
+    this.status = status
+  }
+}
+
+try {
+  await scriptRunner(main)
+  process.exit(0)
+} catch (error) {
+  console.error(error)
+  process.exit(1)
+}