We are self employed should we file taxes every 3 months or onece a year at tax time ?

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If you are a sole proprietor, you should only file one1040 tax return to include a Schedule C (business income and expenses) per year.

However, you may need to file for quarterly estimated tax payments.

See A Guide to Paying Quarterly Taxes

https://turbotax.intuit.com/tax-tips/self-employment-taxes/a-guide-to-paying-quarterly-taxes/L6p8C53...