If by "write-offs" you mean expenses you paid in order to earn the income, those will lower your taxable income.
Lower taxable income USUALLY means a lower tax bill.
If your tax bill "Zeros-out", more expenses will not change the tax.
There are also credits based on your income, so more or less income could mean more or less credits which could mean more or less of a refund.
For example, the Earned Income Credit is based on your earned income. That credit goes up to a certain income level, then drops down. For this credit less income could mean more OR LESS credit, thus more or less refund; HOWEVER be aware that the IRS would not view a taxpayer intentionally lowering their income (or NOT claiming expenses to inflate their profit) in order to get a bigger refund as proper. Doing something like that could result in penalties or worst.
The best way to file a tax return is to report everything as honestly as possible.
When you are Self-Employed, you are required to report ALL income and ALL expenses.
@pearlblack
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