diff --git a/billing/test-run-billing.md b/billing/test-run-billing.md
index 43c549c..fb9c4fb 100644
--- a/billing/test-run-billing.md
+++ b/billing/test-run-billing.md
@@ -4,11 +4,11 @@
 All amounts exclude Sales Tax - this will be added at checkout for your country by our Merchant of Record, Paddle.
 {% endhint %}
 
-DeviceCloud debits customers account per test run.
+DeviceCloud charges your Team's account per test run. This happens as soon as you run `dcd cloud`.
 
 In billing terms, a test run is a single top-level flow executing on a single device. Multiple flows in an upload will incur multiple charges. 
 
-For example, an upload with 10 flows running on iOS (at $0.11 per test run) will incur $1.10 of debits to the customer account.
+For example, an upload with 10 flows running on iOS (at $0.11 per test run) will incur $1.10 of charges to your Team's account.
 
 Details of charges made to your account can be found on the [billing page](https://console.devicecloud.dev/billing).
 
@@ -25,12 +25,18 @@ Enterprise customers with volume discounts or grandfathered users with older pri
 
 ### Credits
 
-Historically, DeviceCloud users have purchased credits in advance and these have been drawn down via usage.
+New Teams are given $20 of trial credit to test the service. Credit balances never expire and can't be topped up, and any remaining balance is used before the included credits of your [plan](subscriptions.md).
 
-{% hint style="info" %}
-Note: credits are only valid for 12 months, after which they automatically expire.
-{% endhint %}
+### Cancelled tests
+
+A test you cancel before it starts running is refunded at 75% of its cost. The 25% is used to cover our network and egress costs from preparing your test to run.
+
+Running tests can't be cancelled from the console. A running test cancelled through the API is charged in full.
+
+Each refund appears as a negative line in your usage history, alongside the original charge. Where it goes depends on how the test was paid for:
 
-New users are given $20 in free credits to test the service.
+* **Credit balance** - the refund is added back to your balance immediately.
+* **Your plan's included credits** - the refund restores that amount of your included allowance for the current billing period.
+* **Overage** - the refund reduces overage that hasn't been billed yet. Overage that has already been billed isn't credited back; the refund is deducted from any further overage in the same billing period instead.
 
-The ability to purchase credits is being phased out in favour of [subscriptions](subscriptions.md).
\ No newline at end of file
+A run paid for from more than one of these is refunded in the same proportions. Refunds for cancelled tests are never paid back to your card.
diff --git a/legal/refund-policy.md b/legal/refund-policy.md
index e9ddc8a..831d97f 100644
--- a/legal/refund-policy.md
+++ b/legal/refund-policy.md
@@ -5,3 +5,5 @@ If you're not happy with our service, please email hello@devicecloud.dev.
 When the platform has failed to perform as per documentation, you may be offered additional free credits.
 
 If the platform fails to perform completely, you can request a refund. This will be granted at our discretion so long as the refund is requested within 14 days of purchase.
+
+Tests you cancel before they start running are refunded automatically at 75% of their cost. See [Cancelled tests](../billing/test-run-billing.md#cancelled-tests) for how these refunds are applied.