Cedar Rapids Iowa Tax office. Phone at Fax: Tax Return. Payment Form. ACH. Payment instructions. Telephone at Fill Form W-9 for Iowa if you owe taxes, penalties or interest. Fill Form W-9 (Rev. October 2018) — Cedar Rapids Iowa Form W 9. Fill Form W-9 for Cedar Rapids Iowa. Fill Form W-9 (Rev. October 2018) — Cedar Rapids Iowa Form W 9. Fill Form W-9 for Cedar Rapids Iowa. Fill Form W -9 (Rev. October 2018) — Cedar Rapids Iowa Form W 9. Fill exactly for your city. If you fill your Form W -9, and it is approved: Fill Form W-9 to file it. Send payment of 75 to: Central Iowa Taxpayer Assistance Service, Address is PO Box 447, Des Moines, IA 50. Fill W9-1 (Rev. October 2018), the Notice of Federal Tax Liability, form that explains penalties that must be included in your Iowa income tax return and is signed by an officer of the IRS or an attorney-at-law if no officer is available. Get it if you owe federal tax and don't want to hire an attorney to file a tax return. Payment is due by Dec. 31 on line 3, the statement below. If you have the money in a bank account, deposit your tax refund or take advantage of the mail-in rebates you may qualify for. If the notice of tax levy sent to you is not returned by Feb. 24 in the first year of residency, you must pay the 30 late remittance penalty. The levy will appear on your tax return. If you have a tax balance and pay to the court instead of filing a return, you can avoid this penalty. Pay the entire balance to the Tax Collector's Office. The interest and penalty will be collected from you. You must have the 300 installment agreement to pay for the first year of residency. If you get tax in your state of residency, you are no longer a resident. In that case, you have to use the installment agreement. Check your bill to see if you are an installment agreement holder.