You may be entitled to an earned income credit. That can go up when your income increases and if it is more than the tax on the additional income, your refund can increase as you mention. You can look on line 27 of your form 1040 to see if you have an earned income credit.
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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