## TL;DR

When a QuickBooks invoice update succeeds but the balance stays put, check what you wrote. To change what the customer owes, update the invoice line items (amounts, rates, quantities) instead.

## Steps

1. When a QuickBooks invoice update succeeds but the balance stays put, check what you wrote. Balance is read-only; the API ignores writes to it without erroring. To change what the customer owes, update the invoice line items (amounts, rates, quantities) instead. The balance recalculates from the lines.

## When to use

You are seeing this: Balance is read-only; the API ignores writes to it without erroring. Use this skill when you run into "QuickBooks Online: invoice Balance is read-only, update the lines instead".

## When not to use

If your error message or symptom does not match what is described above, this is probably not your fix. Search for your exact error text instead of forcing this one to fit.

## Versions

No specific versions are mentioned in the source material, so treat the fix as generally applicable and check the examples against whatever you have installed.

## Why this happens

The original report does not dig into a root cause. It documents the symptom and the fix that resolved it.