Just put your new address on your new Tax Filing, and they'll update their systems. Or see here for other methods: https://www.irs.gov/faqs/irs-procedures/address-changes/address-changes
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Just put your new address on your new Tax Filing, and they'll update their systems. Or see here for other methods: https://www.irs.gov/faqs/irs-procedures/address-changes/address-changes
Check your EIN confirmation letter (CP 575) first. If that is gone, look at a previously filed tax return, a business bank account application, or any 1099 you have issued. Your bank or your payroll provider will also have it on file.