QB Issue Resolution:
First off, @EmilyCowan and @JamesOng made some great points to guide you, and separating personal and business is a must whether you are freelancing or running your own business full time. It will make everything (especially come tax time) much easier for you.
If you already have a business license, it is clear this is not a hobby. You do not get a business license unless you are looking to gain a profit from your area of expertise. I suggest opening a separate bank account for your business. This will allow you to track your freelance income and expenses without intermingling income from your other job and personal expenses. If you do this, creating a Schedule C for your Form 1040 federal tax return and equivalent state return will be a painless process. Your income (loss) from this business will go on the “business income” line separate from your “wages” on the 1040.
Keep in mind no taxes are withheld on this income, so you will owe Uncle Sam SE Tax, which is 15.3%. The withholdings from your other job will help offset some SE Tax, so that is a plus! This is a very high-level view and you should consult with a tax advisor on specifics.
Resolution for Issue 'When moonlighting turns into almost real money' available: Yes (Solved).
Source: Intuit Community forum.
When moonlighting turns into almost real money: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for business license
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Error Recovery for business license [Canada]
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