https://www.irs.gov/

https://www.irs.gov/identity-theft-fraud-scams/get-an-identity-protection-pin

https://www.irs.gov/individuals/get-transcript

https://www.irs.gov/filing/wheres-my-amended-return

https://www.irs.gov/payments/direct-pay-with-bank-account  

https://apps.irs.gov/app/tax-withholding-estimator https://www.irs.gov/individuals/tax-withholding-estimator

https://azdor.gov/wheres-my-refund

https://www.calculator.net/tax-calculator.html

https://workspace.fiverr.com/self-employment-tax-calculator/